实现异步调用（下单服务发送消息）

01-placeorder/pom.xml

@@ -26,6 +26,10 @@
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-openfeign</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-amqp</artifactId>
+        </dependency>
     </dependencies>
 
 </project>

01-placeorder/src/main/java/com/mashibing/config/RabbitMQConfig.java

@@ -0,0 +1,52 @@
+package com.mashibing.config;
+
+import org.springframework.amqp.core.*;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * @author zjw
+ * @description
+ */
+@Configuration
+public class RabbitMQConfig {
+
+    // 下单服务的交换机
+    public static final String PLACE_ORDER_EXCHANGE = "place_order_exchange";
+    // 三个服务的Queue
+    public static final String COUPON_QUEUE = "coupon_queue";
+    public static final String USER_POINTS_QUEUE = "user_points_queue";
+    public static final String BUSINESS_QUEUE = "business_queue";
+
+
+    @Bean
+    public Exchange placeOrderExchange(){
+        return ExchangeBuilder.fanoutExchange(PLACE_ORDER_EXCHANGE).build();
+    }
+
+    @Bean
+    public Queue couponQueue(){
+        return QueueBuilder.durable(COUPON_QUEUE).build();
+    }
+    @Bean
+    public Queue userPointsQueue(){
+        return QueueBuilder.durable(USER_POINTS_QUEUE).build();
+    }
+    @Bean
+    public Queue businessQueue(){
+        return QueueBuilder.durable(BUSINESS_QUEUE).build();
+    }
+
+    @Bean
+    public Binding couponBinding(Exchange placeOrderExchange,Queue couponQueue){
+        return BindingBuilder.bind(couponQueue).to(placeOrderExchange).with("").noargs();
+    }
+    @Bean
+    public Binding userPointsBinding(Exchange placeOrderExchange,Queue userPointsQueue){
+        return BindingBuilder.bind(userPointsQueue).to(placeOrderExchange).with("").noargs();
+    }
+    @Bean
+    public Binding businessBinding(Exchange placeOrderExchange,Queue businessQueue){
+        return BindingBuilder.bind(businessQueue).to(placeOrderExchange).with("").noargs();
+    }
+}

01-placeorder/src/main/java/com/mashibing/controller/PlaceOrderController.java

@@ -1,6 +1,8 @@
 package com.mashibing.controller;
 
 import com.mashibing.client.*;
+import com.mashibing.config.RabbitMQConfig;
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
@@ -16,6 +18,8 @@ public class PlaceOrderController {
     private ItemStockClient itemStockClient;
     @Autowired
     private OrderManageClient orderManageClient;
+
+    /*
     @Autowired
     private CouponClient couponClient;
     @Autowired
@@ -23,7 +27,10 @@ public class PlaceOrderController {
     @Autowired
     private BusinessClient businessClient;
 
+*/
 
+    @Autowired
+    private RabbitTemplate rabbitTemplate;
     /**
      * 模拟用户下单操作
      * @return
@@ -35,12 +42,19 @@ public class PlaceOrderController {
         itemStockClient.decr();
         //2、调用订单服务，创建订单
         orderManageClient.create();
+
+        // 将之前的同步方式注释
+        /*
         //3、调用优惠券服务，预扣除使用的优惠券
         couponClient.coupon();
         //4、调用用户积分服务，预扣除用户使用的积分
         userPointsClient.up();
         //5、调用商家服务，通知商家用户已下单
         businessClient.notifyBusiness();
+*/
+        String userAndOrderInfo = "用户信息&订单信息&优惠券信息等等…………";
+        // 将同步方式修改为基于RabbitMQ的异步方式
+        rabbitTemplate.convertAndSend(RabbitMQConfig.PLACE_ORDER_EXCHANGE,"",userAndOrderInfo);
 
         long end = System.currentTimeMillis();
         System.out.println(end - start);

01-placeorder/src/main/resources/application.yml

@@ -8,3 +8,9 @@ spring:
     nacos:
       discovery:
         server-addr: 114.116.226.76:8848
+  rabbitmq:
+    host: 114.116.226.76
+    port: 5672
+    username: rabbitmq
+    password: rabbitmq
+    virtual-host: rabbitmq