使用Java代码来演示消息的发送和接收
<dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-spring-boot-starter</artifactId><version>2.0.2</version>
</dependency>1 发送消息
消息发送步骤:
- 创建消息生产者, 指定生产者所属的组名
- 指定Nameserver地址
- 启动生产者
- 创建消息对象，指定主题、标签和消息体
- 发送消息
- 关闭生产者
//发送消息
public class RocketMQSendTest {public static void main(String[] args) throws Exception {//1. 创建消息生产者, 指定生产者所属的组名DefaultMQProducer producer = new DefaultMQProducer("myproducer-group");//2. 指定Nameserver地址producer.setNamesrvAddr("192.168.109.131:9876");//3. 启动生产者producer.start();//4. 创建消息对象，指定主题、标签和消息体Message msg = new Message("myTopic", "myTag",("RocketMQ Message").getBytes());//5. 发送消息SendResult sendResult = producer.send(msg,10000);System.out.println(sendResult);//6. 关闭生产者producer.shutdown();}
}2 接收消息
消息接收步骤:
- 创建消息消费者, 指定消费者所属的组名
- 指定Nameserver地址
- 指定消费者订阅的主题和标签
- 设置回调函数，编写处理消息的方法
- 启动消息消费者
//接收消息
public class RocketMQReceiveTest {public static void main(String[] args) throws MQClientException {//1. 创建消息消费者, 指定消费者所属的组名DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("myconsumer-
group");//2. 指定Nameserver地址consumer.setNamesrvAddr("192.168.109.131:9876");//3. 指定消费者订阅的主题和标签consumer.subscribe("myTopic", "*");//4. 设置回调函数，编写处理消息的方法consumer.registerMessageListener(new MessageListenerConcurrently() {@Overridepublic ConsumeConcurrentlyStatus consumeMessage(List<MessageExt>
msgs,ConsumeConcurrentlyContext
context) {System.out.println("Receive New Messages: " + msgs);//返回消费状态return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;}});//5. 启动消息消费者consumer.start();System.out.println("Consumer Started.");}
}3 案例
接下来我们模拟一种场景: 下单成功之后，向下单用户发送短信。设计图如下：
3.1 订单微服务发送消息
1 在 shop-order 中添加rocketmq的依赖
<!--rocketmq-->
<dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-spring-boot-starter</artifactId><version>2.0.2</version>
</dependency>
<dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-client</artifactId><version>4.4.0</version>
</dependency>2 添加配置
rocketmq:
name-server: 192.168.109.131:9876 #rocketMQ服务的地址
producer:group: shop-order # 生产者组3 编写测试代码
@RestController
@Slf4j
public class OrderController2 {@Autowiredprivate OrderService orderService;@Autowiredprivate ProductService productService;@Autowiredprivate RocketMQTemplate rocketMQTemplate;//准备买1件商品@GetMapping("/order/prod/{pid}")public Order order(@PathVariable("pid") Integer pid) {log.info(">>客户下单,这时候要调用商品微服务查询商品信息");//通过fegin调用商品微服务Product product = productService.findByPid(pid);if (product == null){Order order = new Order();order.setPname("下单失败");return order;}log.info(">>商品信息,查询结果:" + JSON.toJSONString(product));Order order = new Order();order.setUid(1);order.setUsername("测试用户");order.setPid(product.getPid());order.setPname(product.getPname());order.setPprice(product.getPprice());order.setNumber(1);orderService.save(order);//下单成功之后,将消息放到mq中rocketMQTemplate.convertAndSend("order-topic", order);return order;}
}
