Springboot：集成RocketMQ使用延遲消息隊列

• application.yml配置文件

rocketmq:
  consumer:
    consumer-group: TestConsumerGroup
  producer:
    producer-group: TestProducerGroup
  namesrv-addr: 127.0.0.1:9876

• ProducerSchedule 生產者

@Component
public class ProducerSchedule {

    private DefaultMQProducer producer;

    @Value("${rocketmq.producer.producer-group}")
    private String producerGroup;

    @Value("${rocketmq.namesrv-addr}")
    private String namesrvAddr;

    public ProducerSchedule() {

    }

    @PostConstruct
    public void defaultMQProducer() {
        if (this.producer == null) {
            this.producer = new DefaultMQProducer(this.producerGroup);
            this.producer.setNamesrvAddr(this.namesrvAddr);
        }
        try {
            this.producer.start();
            System.out.println("-------producer start");
        } catch (MQClientException e) {
            e.printStackTrace();
        }
    }

    public String send(String topic, String messageText) throws Exception {
        Message message = new Message(topic, messageText.getBytes());
		// messageDelayLevel=1s 5s 10s 30s 1m 2m 3m 4m 5m 6m 7m 8m 9m 10m 20m 30m 1h 2h
		// 這裏設置4，即30s的延遲
        message.setDelayTimeLevel(4);

        SendResult result = this.producer.send(message);
        System.out.println(result.getMsgId());
        System.out.println(result.getSendStatus());
        return result.getMsgId();
    }


}

• ConsumerSchedule 消費者

@Component
public class ConsumerSchedule implements CommandLineRunner {

    @Value("${rocketmq.consumer.consumer-group}")
    private String consumerGroup;

    @Value("${rocketmq.namesrv-addr}")
    private String namesrvAddr;

    public void messageListener() throws MQClientException {
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(consumerGroup);

        consumer.setNamesrvAddr(namesrvAddr);

        consumer.subscribe("TopicTest", "*");

        // 每次消費的消息數
        consumer.setConsumeMessageBatchMaxSize(1);

        consumer.registerMessageListener((MessageListenerConcurrently) (messages, context) -> {
            for (Message message : messages) {
                System.out.println("消息：" + new String(message.getBody()));
            }
            return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
        });

        consumer.start();
    }


    @Override
    public void run(String... args) throws Exception {
        this.messageListener();
    }
}

• 測試類

@Autowired
private ProducerSchedule producerSchedule;
    
public void pushMessageToMQ() throws Exception {
    producerSchedule.send("TopicTest", "test");
}