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create_sql.md

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+# 创建 OneOffWord 的数据库  
+
+### 创建名叫 `oneoffword` 的库  
+```
+create database if not exists OneOffWord;
+```
+(应该会失败,因为没有权限,创建失败可以去  phpMyAdmin 创建) 
+
+### 查看当前 有哪些库  
+```
+show databases;
+```
+
+### 使用 `OneOffWord` 库 
+```
+use oneoffword;
+```
+
+### 创建名为 `messagedata` 的表   
+```
+create table if not exists messagedata(`id` char(5) not null, `word` varchar(10000) not null, `date` datetime not null, `timelimit` smallint not null, primary key(id)) engine=InnoDB default charset=utf8; 
+```  
+### 查看该库有哪些表
+```
+show tables;
+```
+
+### 查看 `messagedata` 表中的数据
+```
+select * from messagedata;
+```

src/main/java/dao/Mysql.java

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+package dao;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.logging.SimpleFormatter;
+
+
+import util.Randomtool;
+
+/**
+ *  建立数据库连接
+ * 
+ * setOneWord(String, String);
+ * 	传入：一段文字,阅读限时
+ * 	传出：在数据库中 的id
+ * 
+ * getOneWord(String);
+ * 	传入：在数据库中的id
+ * 	传出：字符数组[一段文字,阅读限时,创建时间]
+ * 
+ */
+public class Mysql {
+
+	Connection con;
+
+	private String SQL_URL;
+	private String SQL_PORT;
+	private String SQL_USER;
+	private String SQL_PWD;
+
+	private final int RANDOM_LEN = 5;
+
+	private final String conFileFomt = "sql_url: \"\";\nport: \"\";\nuser: \"\";\npwd: \"\";";
+
+	public Mysql(){
+		upConInfo(); // 在配置文件中检查并获取基本连接信息
+	}
+
+	public String setOneWord(String word, String time) {
+		String id = null;
+		con_Sql();
+		if(time.indexOf("-")!=-1) {
+			time.replace("-", "");
+		}
+		double timeli_d;
+		try {
+			timeli_d = Double.parseDouble(time);
+		} catch (NumberFormatException e) {
+			timeli_d = 2;
+		}
+		String timeli_i = (int)(timeli_d*60)+"";
+		Date date = new Date();
+		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+		String datef = sdf.format(date);
+		String Lettern = Randomtool.getLettern(RANDOM_LEN);
+		String insertsql = "insert into messagedata value('"+Lettern+"','"+word+"','"+datef+"','"+timeli_i+"');";
+//		System.out.println("拼接命令:"+insertsql);
+		Statement sql_con;
+		int ok = 0;
+		try {
+			sql_con = con.createStatement();
+			ok = sql_con.executeUpdate(insertsql);
+			con.close();
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+		if(ok != 0)
+			id = Lettern;
+		return id;
+	}
+
+	public String[] getOneWord(String id) {
+		String data[] = new String[3];
+		con_Sql();
+		if(id.length() != RANDOM_LEN) {
+			return data;
+		}
+		String searchsql = "select * from messagedata where id='" + id + "';";
+		String delsql = "delete from messagedata where id='" + id + "';";
+		Statement sql_con;
+		ResultSet rs;
+		try {
+			sql_con = con.createStatement();
+			rs = sql_con.executeQuery(searchsql);
+			if(rs.next()) {
+//				System.out.println("有记录");
+				data[0] = rs.getString("word");
+				data[1] = rs.getDate("date")+"";
+				data[2] = rs.getInt("timelimit")+"";
+				sql_con.executeUpdate(delsql);
+			}else {
+				data[0] = "文本不存在";
+				data[1] = "";
+				data[2] = "0";
+			}
+			con.close();
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+		return data;
+	}
+
+
+	private void upConInfo() {
+		File file = new File("config_sql");
+		if(!file.exists()) { // 配置文件不存在时创建文件
+			try {
+				file.createNewFile();
+				addDefaultConf(file);
+			} catch (IOException e) {
+				System.out.println("无法创建config_sql,请在项目所在目录下创建该文件");
+				e.printStackTrace();
+			}
+			System.out.println("config_sql 文件位置: "+file.getAbsolutePath());
+			System.out.println("请在config_sql文件里添加你的sql的基本信息");
+		} else { // 配置文件存在时读取文件
+			try {
+				FileReader fr = new FileReader(file);
+				StringBuffer context = new StringBuffer(""); // 在配置文件中读取到的信息
+				char[] cbuf = new char[1024];
+				int hasread = -1; // 初始化已读取的字符数
+				while ((hasread = fr.read(cbuf)) != -1) {
+					context.append(new String(cbuf, 0, hasread));
+				}
+				fr.close();
+				boolean conferr = false; // 检查配置文件是否有效
+				if(context.length() <= conFileFomt.length()) { // 如果没有在配置文件中填入新的信息
+					conferr = true;
+					addDefaultConf(file);
+				}
+				String conflist[] = context.toString().split(";");
+				if(conflist.length != 5) {
+					conferr = true;
+				}else {
+					SQL_URL = conflist[0].substring(conflist[0].indexOf("\"")+1, conflist[0].lastIndexOf("\""));
+					SQL_PORT = conflist[1].substring(conflist[1].indexOf("\"")+1, conflist[1].lastIndexOf("\""));
+					SQL_USER = conflist[2].substring(conflist[2].indexOf("\"")+1, conflist[2].lastIndexOf("\""));
+					SQL_PWD = conflist[3].substring(conflist[3].indexOf("\"")+1, conflist[3].lastIndexOf("\""));					
+					System.out.println("========== sql_info ==========\nSQL_URL:"+SQL_URL + "\nSQL_PORT:"+SQL_PORT + "\nSQL_USER:"+SQL_USER + "\nSQL_PWD:"+SQL_PWD+ "\n========== sql_info ==========");
+				}
+				if(conferr) {
+					System.out.println("config_sql 文件位置: "+file.getAbsolutePath());
+					System.out.println("数据库的配置文件中存在错误，请检查config_sql");
+				}
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	private void addDefaultConf(File file) { // 向配置文件中写入默认模板
+		FileWriter fw;
+		try {
+			fw = new FileWriter(file);
+			fw.write(conFileFomt);
+			fw.close();	
+		} catch (IOException e) {
+			System.out.println("初始化数据库配置文件模板失败，请创建config_sql文件并添加如下配置：\n"+conFileFomt);
+			e.printStackTrace();
+		}
+	}
+
+
+	private void con_Sql() {
+		String url = "jdbc:mysql://" + SQL_URL + ":" + SQL_PORT + "/oneoffword?useSSL=false&characterEncoding=utf-8";
+		try {
+			con = DriverManager.getConnection(url, SQL_USER, SQL_PWD);
+		} catch (SQLException e) {
+			e.printStackTrace();
+			System.out.println("无法连接数据库");
+		}
+	}
+}

src/main/java/data/Message_Bean.java

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+package data;
+
+import javax.servlet.http.HttpServlet;
+
+/**
+ * 本应在此处存一些数据
+ * 
+ * v0.1.0
+ * 目前这里有数据，或许还有唯一用途大概就是发送rsa公钥了吧,但路径原因,已弃用
+ *
+ */
+public class Message_Bean extends HttpServlet{
+
+	/**
+	 * 获取公钥
+	 */
+	public String getRSAPK() {
+		String rsapk = null;
+
+		return rsapk;
+	}
+}

src/main/java/handle/Getword_Servlet.java

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+package handle;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import dao.Mysql;
+import util.RSAtool;
+
+public class Getword_Servlet extends HttpServlet{
+	Mysql ms;
+	RSAtool rsa;
+
+	public static String ERRALERT = "<html><head><meta charset=\"utf-8\"></head></html><script>alert(\"正常情况下,你不应该看见这个弹窗,你一定是做了不正常的事.\");var r=confirm(\"你想要访问这个项目吗? -> https://github.com/xmexg/OneffWord\");if(r){window.location.replace(\"https://github.com/xmexg/OneOffWord\");}else{window.location.replace(\"/OneOffWord\");}</script>";
+
+	public void init(ServletConfig config) throws ServletException{
+		super.init(config);
+		ms = new Mysql();
+		rsa = new RSAtool();
+	}
+
+	public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
+		String id_c = request.getParameter("id");
+		System.out.println("id:"+id_c);
+		String info[] = new String[3];
+		info = ms.getOneWord(id_c);
+		for(String s : info) {
+			System.out.println("信息:"+s);
+		}
+		String result = null;
+		if(info != null) {
+//			result = "{\"" + info[0]+ "\",\"" + info[1] + "\",\"" + info[2] + "\"}";
+			result = info[2] + "," + info[1] + "," + info[0];
+		}
+		response.setCharacterEncoding("UTF-8");
+		PrintWriter out = response.getWriter();
+		out.write(result);
+	}
+
+	public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
+		response.setCharacterEncoding("UTF-8");
+		PrintWriter out = response.getWriter();
+		out.write(ERRALERT);
+		}
+}

src/main/java/handle/Upword_Servlet.java

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+package handle;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import dao.Mysql;
+import util.RSAtool;
+
+
+/**
+ * 存放文本
+ * 传入:文本,阅读限时
+ * 传回:id
+ *
+ */
+	public class Upword_Servlet extends HttpServlet{
+	Mysql ms;
+	RSAtool rsa;//已弃用
+	public static String ERRALERT = "<html><head><meta charset=\"utf-8\"></head></html><script>alert(\"正常情况下,你不应该看见这个弹窗,你一定是做了不正常的事.\");var r=confirm(\"你想要访问这个项目吗? -> https://github.com/xmexg/OneffWord\");if(r){window.location.replace(\"https://github.com/xmexg/OneOffWord\");}else{window.location.replace(\"/OneOffWord\");}</script>";
+
+	public void init(ServletConfig config) throws ServletException{
+		super.init(config);
+		ms = new Mysql();
+		rsa = new RSAtool();
+	}
+
+	public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
+		String word_c = request.getParameter("word");
+		String time_c = request.getParameter("time");
+		System.out.println("接收到文本:"+word_c+"\n接收到时间:"+time_c);
+		String id = ms.setOneWord(word_c, time_c);
+		if(id == null) {
+			id = "保存文本失败,请稍后重试";
+		}else {
+			id = "密文id为:" + id;
+		}
+		response.setCharacterEncoding("UTF-8");
+		PrintWriter out = response.getWriter();
+		out.write(id);
+	}
+
+	public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
+		response.setCharacterEncoding("UTF-8");
+		PrintWriter out = response.getWriter();
+		out.write(ERRALERT);
+		}
+
+}