SpringBoot中使用RocketMQ的示例代码_Java教程

接下来我们模拟一种场景：商品下单成功之后，向下单用户发送短信。以此来示例SpringBoot中RocketMQ的使用方式。

SpringBoot中使用RocketMQ的示例代码

1 订单微服务发送消息

1.1 订单微服务添加rocketmq的依赖

      <!--rocketmq-->
      <dependency>
          <groupId>org.apache.rocketmq</groupId>
          <artifactId>rocketmq-spring-boot-starter</artifactId>
          <version>2.1.1</version>
      </dependency>
      <dependency>
          <groupId>org.apache.rocketmq</groupId>
          <artifactId>rocketmq-client</artifactId>
          <version>4.7.1</version>
      </dependency>

1.2 添加配置

rocketmq:
name-server: 192.168.232.129:9876 # rocketmq服务的地址
producer:
  group: jack-producer-group  # 生产者组名

1.3 编写测试代码

package cn.jack.controller;

import cn.jack.domain.Order;
import cn.jack.domain.Product;
import cn.jack.service.OrderService;
import cn.jack.service.ProductService;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.spring.core.RocketMQTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@Slf4j
public class OrderController {

  @Autowired
  private RestTemplate restTemplate;
  @Autowired
  private OrderService orderService;
  @Autowired
  private DiscoveryClient discoveryClient;
  @Autowired
  private ProductService productService;
  @Autowired
  private RocketMQTemplate rocketMQTemplate;

  /**
   * 下单 -- 基于Feign实现服务调用
   * @param pid   商品id
   * @return
   */
  @RequestMapping("/order/prod/{pid}")
  public Order order(@PathVariable("pid") Long pid) {
      log.info("收到下单请求，准备查询商品信息。pid={}", pid);

      // 通过Feign调用商品微服务，查询商品信息
      Product product = this.productService.findByPid(pid);
      log.info("商品信息查询成功。内容为：{}", JSON.toJSONString(product));

      // 进行容错判断
      if (product.getPid() == -100) {
          Order order = new Order();
          order.setOid(-100L);
          order.setPname("下单失败");
          return order;
      }

      // 生成商品信息保存
      Order order = new Order();
      order.setNumber(1);
      order.setPid(pid);
      order.setPname(product.getPname());
      order.setPprice(product.getPprice());
      order.setUid(1);
      order.setUsername("陈家宝");

      this.orderService.createOrder(order);
      log.info("订单信息保存成功。内容为：{}", JSON.toJSONString(order));

      // TODO 下单成功之后，mq发送订单内容消息
      rocketMQTemplate.convertAndSend("jack-topic", order);

      return order;
  }
}

1.4 测试

访问下单接口，确认RocketMQ是否发送了消息。从RocketMQ控制台得到确认，消息发送成功。

SpringBoot中使用RocketMQ的示例代码

2 用户微服务订阅消息

2.1 用户微服务增加rocketmq依赖

      <!--nacos客户端-->
      <dependency>
          <groupId>com.alibaba.cloud</groupId>
          <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
      </dependency>

      <!--rocketmq-->
      <dependency>
          <groupId>org.apache.rocketmq</groupId>
          <artifactId>rocketmq-spring-boot-starter</artifactId>
          <version>2.1.1</version>
      </dependency>
      <dependency>
          <groupId>org.apache.rocketmq</groupId>
          <artifactId>rocketmq-client</artifactId>
          <version>4.7.1</version>
      </dependency>

2.2 修改主类，启动nacos客户端

package cn.jack;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class UserApplication {
  public static void main(String[] args) {
      SpringApplication.run(UserApplication.class);
  }
}

2.3 修改配置文件

rocketmq:
name-server: 192.168.232.129:9876 # rocketmq服务的地址

2.4 编写消息接收服务

package cn.jack.service;

import cn.jack.domain.Order;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.spring.annotation.RocketMQMessageListener;
import org.apache.rocketmq.spring.core.RocketMQListener;
import org.springframework.stereotype.Service;

@Slf4j
@Service
@RocketMQMessageListener(consumerGroup = "jack-consumer-group", topic = "jack-topic")
public class SmsService implements RocketMQListener<Order> {
  @Override
  public void onMessage(Order order) {
      log.info("收到订单信息，内容如下：{}， 接下来进行短信发送", order);
  }
}

2.5 测试

启动用户微服务，收到了来自RocketMQ的消息。

2020-09-16 21:46:30.465 INFO [service-user,,,] 660 --- [MessageThread_2] cn.jack.service.SmsService : 收到订单信息，内容如下：Order(oid=66, uid=1, username=陈家宝, pid=2, pname=雪梨, pprice=2000.0, number=1)，接下来进行短信发送
2020-09-16 21:46:30.465 INFO [service-user,,,] 660 --- [MessageThread_1] cn.jack.service.SmsService : 收到订单信息，内容如下：Order(oid=65, uid=1, username=陈家宝, pid=3, pname=华为, pprice=8000.0, number=1)，接下来进行短信发送

消息成功消费：

SpringBoot中使用RocketMQ的示例代码