init RestTemplate发起远程调用

order-service/pom.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>cloud-demo</artifactId>
+        <groupId>cn.itcast.demo</groupId>
+        <version>1.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>order-service</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+        </dependency>
+        <!--mybatis-->
+        <dependency>
+            <groupId>org.mybatis.spring.boot</groupId>
+            <artifactId>mybatis-spring-boot-starter</artifactId>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

order-service/src/main/java/cn/itcast/order/OrderApplication.java

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+package cn.itcast.order;
+
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestTemplate;
+
+@MapperScan("cn.itcast.order.mapper")
+@SpringBootApplication
+public class OrderApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(OrderApplication.class, args);
+    }
+
+    @Bean
+    public RestTemplate getRestTemplate () {
+        return new RestTemplate();
+    }
+
+}

order-service/src/main/java/cn/itcast/order/mapper/OrderMapper.java

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+package cn.itcast.order.mapper;
+
+import cn.itcast.order.pojo.Order;
+import org.apache.ibatis.annotations.Select;
+
+public interface OrderMapper {
+
+    @Select("select * from tb_order where id = #{id}")
+    Order findById(Long id);
+}

order-service/src/main/java/cn/itcast/order/pojo/Order.java

@@ -0,0 +1,13 @@
+package cn.itcast.order.pojo;
+
+import lombok.Data;
+
+@Data
+public class Order {
+    private Long id;
+    private Long price;
+    private String name;
+    private Integer num;
+    private Long userId;
+    private User user;
+}

order-service/src/main/java/cn/itcast/order/pojo/User.java

@@ -0,0 +1,10 @@
+package cn.itcast.order.pojo;
+
+import lombok.Data;
+
+@Data
+public class User {
+    private Long id;
+    private String username;
+    private String address;
+}

order-service/src/main/java/cn/itcast/order/service/OrderService.java

@@ -0,0 +1,28 @@
+package cn.itcast.order.service;
+
+import cn.itcast.order.mapper.OrderMapper;
+import cn.itcast.order.pojo.Order;
+import cn.itcast.order.pojo.User;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class OrderService {
+
+    @Autowired
+    private OrderMapper orderMapper;
+
+    @Autowired
+    private RestTemplate restTemplate;
+
+    public Order queryOrderById(Long orderId) {
+        // 1.查询订单
+        Order order = orderMapper.findById(orderId);
+        String url = "http://localhost:8081/user/" + order.getUserId();
+        User user = restTemplate.getForObject(url, User.class);
+        order.setUser(user);
+        // 4.返回
+        return order;
+    }
+}

order-service/src/main/java/cn/itcast/order/web/OrderController.java

@@ -0,0 +1,23 @@
+package cn.itcast.order.web;
+
+import cn.itcast.order.pojo.Order;
+import cn.itcast.order.service.OrderService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("order")
+public class OrderController {
+
+   @Autowired
+   private OrderService orderService;
+
+    @GetMapping("{orderId}")
+    public Order queryOrderByUserId(@PathVariable("orderId") Long orderId) {
+        // 根据id查询订单并返回
+        return orderService.queryOrderById(orderId);
+    }
+}

order-service/src/main/resources/application.yml

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+server:
+  port: 8080
+spring:
+  datasource:
+    url: jdbc:mysql://localhost:3306/cloud_order?useSSL=false
+    username: root
+    password: 1234
+    driver-class-name: com.mysql.jdbc.Driver
+mybatis:
+  type-aliases-package: cn.itcast.user.pojo
+  configuration:
+    map-underscore-to-camel-case: true
+logging:
+  level:
+    cn.itcast: debug
+  pattern:
+    dateformat: MM-dd HH:mm:ss:SSS