使用RocketMQ 发送简单消息

Apache RocketMQ(官网地址:http://rocketmq.apache.org)是由阿里巴巴集团开源的大型消息队列,现在已经贡献给了Apache开源基金会,同时是一个分布式消息传递和流媒体平台,具有低延迟、高性能、可靠性、万亿级容量和灵活的可扩展性。(Github官网地址:https://github.com/apache/rocketmq)

 

1. 加入RocketMQ依赖

<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-client</artifactId>
    <version>4.2.0</version>
</dependency>

2. 配置RocketMQ服务信息

xc:
  rocketmq:
    consumer:
      PushConsumer: PushConsumer
    producer:
      producerGroup: Producer
    namesrvAddr: 172.19.25.168:9876

3. 编写生产者和消费者

这里以发送10条简单消息为例,创建一个生产者,这里使用的是默认生产者DefaultMQProducer,在构建生产者的时候使用构造方法设置生产者的组名。使用setNamesrvAddr()方法设置NameServer,如果有多个NameServer,就使用逗号分隔。这里需要注意一点,生产者对象只调用一次start方法即可,不需要每次都调用。在构建消息体时设置topic和tags。

@Component
public class RocketMQSender {
    @Value("${xc.rocketmq.producer.producerGroup}")
    private String producerGroup;
    @Value("${xc.rocketmq.namesrvAddr}")
    private String namesrvAddr;
    private static final Logger log = LoggerFactory.getLogger(RocketMQSender.class);

    public void defaultMQProducer() {
        DefaultMQProducer producer = new DefaultMQProducer(producerGroup);
        producer.setVipChannelEnabled(false);
        producer.setNamesrvAddr(namesrvAddr);
        try {
            producer.start();
            Message message = new Message("TopicTest", "push", "【发送消息】".getBytes());
            StopWatch stop = new StopWatch();
            stop.start();
            for (int i = 0; i < 10; i++) {
                SendResult result = producer.send(message, new MessageQueueSelector() {
                    @Override
                    public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
                        Integer id = (Integer) arg;
                        int index = id % mqs.size();
                        return mqs.get(index);
                    }
                }, 1);
                log.info("发送响应:MsgId:" + result.getMsgId() + ",发送状态:" + result.getSendStatus());
            }
            stop.stop();
            log.info("----------------发送十条消息耗时:" + stop.getTotalTimeMillis());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            producer.shutdown();
        }
    }

}

接下来编写一个消费者,其中的设置与生产者类似

@Component
public class RocketMQReceiver {
    @Value("${xc.rocketmq.consumer.PushConsumer}")
    private String consumerGroup;
    @Value("${xc.rocketmq.namesrvAddr}")
    private String namesrvAddr;
    private static final Logger log = LoggerFactory.getLogger(RocketMQReceiver.class);

    //@PostContruct是spring框架的注解,在方法上加该注解会在项目启动的时候执行该方法,也可以理解为在spring容器初始化的时候执行该方法。
    @PostConstruct
    public void defaultMQPushConsumer() {
        //消费者的组名
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(consumerGroup);

        //指定NameServer地址,多个地址以 ; 隔开
        consumer.setNamesrvAddr(namesrvAddr);
        try {
            //订阅PushTopic下Tag为push的消息
            consumer.subscribe("TopicTest", "push");

            //设置Consumer第一次启动是从队列头部开始消费还是队列尾部开始消费
            //如果非第一次启动,那么按照上次消费的位置继续消费
            consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
            consumer.registerMessageListener((MessageListenerConcurrently) (list, context) -> {
                try {
                    for (MessageExt messageExt : list) {
                        //输出消息内容
                        log.info("messageExt: " + messageExt);
                        String messageBody = new String(messageExt.getBody());
                        //输出消息内容
                        log.info("【defaultMQPushConsumer消费响应】:msgId : " + messageExt.getMsgId() + ",  msgBody : " + messageBody);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    //稍后再试
                    return ConsumeConcurrentlyStatus.RECONSUME_LATER;
                }
                //消费成功
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            });
            consumer.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //@PostContruct是spring框架的注解,在方法上加该注解会在项目启动的时候执行该方法,也可以理解为在spring容器初始化的时候执行该方法。
    @PostConstruct
    public void defaultMQPushConsumer2() {
        //消费者的组名
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("aaa");

        //指定NameServer地址,多个地址以 ; 隔开
        consumer.setNamesrvAddr(namesrvAddr);
        try {
            //订阅PushTopic下Tag为push的消息
            consumer.subscribe("TopicTest", "push");

            //设置Consumer第一次启动是从队列头部开始消费还是队列尾部开始消费
            //如果非第一次启动,那么按照上次消费的位置继续消费
            consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
            consumer.registerMessageListener((MessageListenerConcurrently) (list, context) -> {
                try {
                    for (MessageExt messageExt : list) {
                        //输出消息内容
                        log.info("---- messageExt: " + messageExt);
                        String messageBody = new String(messageExt.getBody());
                        //输出消息内容
                        log.info("----【defaultMQPushConsumer2消费响应】:msgId : " + messageExt.getMsgId() + ",  msgBody : " + messageBody);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    //稍后再试
                    return ConsumeConcurrentlyStatus.RECONSUME_LATER;
                }
                //消费成功
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            });
            consumer.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

最后编写一个RocketMQController类来调用生产者发送消息

@RestController
public class RocketMQController {

    @Autowired
    private RocketMQSender rocketMQSender;

    @GetMapping("testRocketmq")
    public void testRocketmq() {
        rocketMQSender.defaultMQProducer();
    }

}

启动项目后,在浏览器中访问http://localhost:8080/testRocketmq

 

文章来源:Spring Boot 2实战之旅 9.3 RocketMQ消息队列

源码:https://gitee.com/caoyeoo0/xc-springboot/tree/mq%2FRocketMQ/

 

posted @ 2020-12-09 15:57  草木物语  阅读(841)  评论(0编辑  收藏  举报