RabbitMQ延迟消息实现

配置类

package com.changgou.order.config;

import org.springframework.amqp.core.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/****
 * @Author:gzy
 * @Description:
 * @Date 2019/9/5 10:50
 *****/
@Configuration
public class RabbitMQConfig {


    //延迟消息
    public static final String RELAY_QUEUE = "relay_queue";
    //交换机名称
    public static final String CANCEL_ORDER_PAY_EXCHANGE = "cancel_order_pay_exchange";

    //队列名称
    public static final String CANCEL_ORDER_QUEUE = "cancel_order_queue";

    //实例化延迟消息,将消息队列绑定到CANCEL_ORDER_PAY_EXCHANGE交换机
    @Bean
    public Queue relayQueue(){
        return QueueBuilder.durable(RELAY_QUEUE)
                .withArgument("x-dead-letter-exchange",CANCEL_ORDER_PAY_EXCHANGE)
                .withArgument("x-dead-letter-routing-key","")
                .build();
    }


    //接收延迟消息队列消息的队列
    @Bean
    public Queue cancelOrderQueue(){
        return new Queue(CANCEL_ORDER_QUEUE);
    }
    //实例化路由交换机
    @Bean
    public DirectExchange directExchange(){
        return new DirectExchange(CANCEL_ORDER_PAY_EXCHANGE);
    }
    //将普通队列绑定到交换机
    @Bean
    public Binding binding(){
        return BindingBuilder.bind(cancelOrderQueue()).to(directExchange()).with("");
    }


}

向死信队列添加消息，等待5秒后消息发送给交换机

//给死信发消息
rabbitTemplate.convertAndSend(RabbitMQConfig.RELAY_QUEUE, (Object)order.getId(), new MessagePostProcessor() {
    @Override
    public Message postProcessMessage(Message message) throws AmqpException {
        message.getMessageProperties().setExpiration("5000");//5秒
        return message;
    }
});

接收消息

 /**
     * 5分钟后  接收到消息
     * @param orderId
     */
    @RabbitListener(queues = {RabbitMQConfig.CANCEL_ORDER_QUEUE})
    public void cancelOrder(String orderId){
         System.out.println("接收到订单ID：" + orderId);
    }