实现延迟队列

原理：利用消息过期后消息进入死信，然后消费者订阅死信队列进行消费达到延迟的功能

 生产者-->交换机01-->过期队列-->消息过期后-->死信交换机-->死行队列-->消费者

 定义配置

@Configuration
public class TTLQueueConfig {

    //region 声明普通类型的交换机和队列

    public static final String PT_EXCHANGENAME="zd.putong.exchange";
    public static final String PT_QUEUEA="zd.putong.queueA";
    public static final String PU_ROUTINGKEY="queueA";

    // 声明普通交换机
    @Bean("ptExchange")
    public DirectExchange ptExchange(){
        return new DirectExchange(PT_EXCHANGENAME);
    }
    // 声明队列 设置该队列ttl 并将其绑定到 死信交换机上
    @Bean("queueA")
    public Queue queueA(){
        Map<String, Object> args = new HashMap<>(3);
        //绑定到死信交换机上
        args.put("x-dead-letter-exchange",SX_EXCHANGENAME);
        //绑定死信路由key
        args.put("x-dead-letter-routing-key",SX_ROUTINGKEY);
        // 设置消息过期时间
        args.put("x-message-ttl",60000);

        return QueueBuilder.durable(PT_QUEUEA).withArguments(args).build();
    };
    // 绑定队列
    @Bean
    public Binding queueABinding(@Qualifier("queueA") Queue queueA, @Qualifier("ptExchange")DirectExchange directExchange){

        return BindingBuilder.bind(queueA).to(directExchange).with(PU_ROUTINGKEY);
    };
    //endregion



    //region 声明死信交换机和队列
    public static final String SX_EXCHANGENAME="zd.sixing.exchange";
    public static final String SX_QUEUEA="zd.sixing.queueA";
    public static final String SX_ROUTINGKEY="zd.sixing.queueA";

    @Bean("sxExchange")
    public DirectExchange sxExchange(){
        return new DirectExchange(SX_EXCHANGENAME);
    }
    @Bean("sxQueueA")
    public Queue queuesxA(){

        return new Queue(SX_QUEUEA,false);
    };
    @Bean
    public Binding sxQueueABinding(@Qualifier("sxQueueA") Queue queueA, @Qualifier("sxExchange")DirectExchange directExchange){

        return BindingBuilder.bind(queueA).to(directExchange).with(SX_ROUTINGKEY);
    };
    //endregion




}　

 

模拟生产者发送消息：

@RequestMapping("/sendMsg")
public String  sendMsg(){
    JSONObject data = new JSONObject();
    data.put("id","0001");
    data.put("msg","我是产生的消息"+System.currentTimeMillis());
    data.put("time",DateUtil.format(new Date(), "yyyy/MM/dd HH:mm:ss"));
    rabbitTemplate.convertAndSend(TTLQueueConfig.PT_EXCHANGENAME,TTLQueueConfig.PU_ROUTINGKEY,data);
    System.out.println("产生消息："+DateUtil.format(new Date(), "yyyy/MM/dd HH:mm:ss"));
    return "发送成功";

}

模拟消费者接受消息：

@RunWith(SpringRunner.class)
@SpringBootTest()
class RabbitmqApplicationTests {
    @Resource
    private RabbitTemplate rabbitTemplate;
    @Test
    void contextLoads() throws InterruptedException {
        while (true) {
            Thread.sleep(1000);
            Object msg = rabbitTemplate.receiveAndConvert(TTLQueueConfig.SX_QUEUEA);
            if (msg!=null){
                System.out.println("收到消息："+ DateUtil.format(new Date(), "yyyy/MM/dd HH:mm:ss")+msg);
            }

        }
    }

}

　结果：

//产生消息：2023/05/30 10:51:22
//收到消息：2023/05/30 10:52:23{"msg":"我是产生的消息1685415082519","id":"0001","time":"2023/05/30 10:51:22"}