1、整体流程

生产者生产了一条设置了TTL的延迟取消订单消息（在订单生成后，即可将订单号交给生产者，发送消息）
消息发送到延迟队列交换机（通过绑定路由键），并将消息投递到延迟队列
消息在延迟队列中时间到期后，经过死信队列交换机投递至死信队列
消费者监听死信队列消息即时消费（可以做取消订单逻辑）

2、代码实现

（1）在pom.xml文件中添加相关依赖

<!--消息队列相关依赖-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
<!--lombok依赖-->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

（2）修改springboot配置文件

  rabbitmq:
    host: localhost # rabbitmq的连接地址
    port: 5672 # rabbitmq的连接端口号
    username: root # rabbitmq的用户名
    password: root # rabbitmq的密码
    publisher-confirms: true #如果对异步消息需要回调必须设置为true

（3）添加消息队列的枚举配置类QueueEnum

package com.zszdevelop.rabbitmqdemo.enums;


import lombok.Getter;

/**
 * 消息队列枚举配置
 */
@Getter
public enum QueueEnum {
    /**
     * 消息通知队列
     */
    QUEUE_ORDER_CANCEL("himall.order.direct", "himall.order.cancel", "himall.order.cancel"),
    /**
     * 消息通知ttl队列
     */
    QUEUE_TTL_ORDER_CANCEL("himall.order.direct.ttl", "himall.order.cancel.ttl", "himall.order.cancel.ttl");

    /**
     * 交换名称
     */
    private String exchange;
    /**
     * 队列名称
     */
    private String name;
    /**
     * 路由键
     */
    private String routeKey;

    QueueEnum(String exchange, String name, String routeKey) {
        this.exchange = exchange;
        this.name = name;
        this.routeKey = routeKey;
    }
}

（4）添加RabbitMQ的配置

package com.zszdevelop.rabbitmqdemo.config;

import com.zszdevelop.rabbitmqdemo.enums.QueueEnum;
import org.springframework.amqp.core.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * 消息队列配置
 */
@Configuration
public class RabbitMqConfig {

    /**
     * 订单消息实际消费队列所绑定的交换机
     */
    @Bean
    DirectExchange orderDirect() {
        return (DirectExchange) ExchangeBuilder
                .directExchange(QueueEnum.QUEUE_ORDER_CANCEL.getExchange())
                .durable(true)
                .build();
    }

    /**
     * 订单延迟队列队列所绑定的交换机
     */
    @Bean
    DirectExchange orderTtlDirect() {
        return (DirectExchange) ExchangeBuilder
                .directExchange(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getExchange())
                .durable(true)
                .build();
    }

    /**
     * 订单实际消费队列
     */
    @Bean
    public Queue orderQueue() {
        return new Queue(QueueEnum.QUEUE_ORDER_CANCEL.getName());
    }

    /**
     * 订单延迟队列（死信队列）
     */
    @Bean
    public Queue orderTtlQueue() {
        return QueueBuilder
                .durable(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getName())
                .withArgument("x-dead-letter-exchange", QueueEnum.QUEUE_ORDER_CANCEL.getExchange())//到期后转发的交换机
                .withArgument("x-dead-letter-routing-key", QueueEnum.QUEUE_ORDER_CANCEL.getRouteKey())//到期后转发的路由键
                .build();
    }

    /**
     * 将订单队列绑定到交换机
     */
    @Bean
    Binding orderBinding(DirectExchange orderDirect,Queue orderQueue){
        return BindingBuilder
                .bind(orderQueue)
                .to(orderDirect)
                .with(QueueEnum.QUEUE_ORDER_CANCEL.getRouteKey());
    }

    /**
     * 将订单延迟队列绑定到交换机
     */
    @Bean
    Binding orderTtlBinding(DirectExchange orderTtlDirect,Queue orderTtlQueue){
        return BindingBuilder
                .bind(orderTtlQueue)
                .to(orderTtlDirect)
                .with(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getRouteKey());
    }

}

(5) 添加消息生产者

package com.zszdevelop.rabbitmqdemo.component;

import com.zszdevelop.rabbitmqdemo.enums.QueueEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessagePostProcessor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * 取消订单消息的发出者
 */
@Component
public class CancelOrderSender {
    private static Logger LOGGER =LoggerFactory.getLogger(CancelOrderSender.class);
    @Autowired
    private AmqpTemplate amqpTemplate;

    public void sendMessage(Long orderId,final long delayTimes){
        //给延迟队列发送消息
        amqpTemplate.convertAndSend(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getExchange(), QueueEnum.QUEUE_TTL_ORDER_CANCEL.getRouteKey(), orderId, new MessagePostProcessor() {
            @Override
            public Message postProcessMessage(Message message) throws AmqpException {
                //给消息设置延迟毫秒值
                message.getMessageProperties().setExpiration(String.valueOf(delayTimes));
                return message;
            }
        });
        LOGGER.info("send delay message orderId:{}",orderId);
    }
}

（6）添加消息发送者

package com.zszdevelop.rabbitmqdemo.component;

import com.zszdevelop.rabbitmqdemo.enums.QueueEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessagePostProcessor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * 取消订单消息的发出者
 */
@Component
public class CancelOrderSender {
    private static Logger LOGGER =LoggerFactory.getLogger(CancelOrderSender.class);
    @Autowired
    private AmqpTemplate amqpTemplate;

    public void sendMessage(Long orderId,final long delayTimes){
        //给延迟队列发送消息
        amqpTemplate.convertAndSend(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getExchange(), QueueEnum.QUEUE_TTL_ORDER_CANCEL.getRouteKey(), orderId, new MessagePostProcessor() {
            @Override
            public Message postProcessMessage(Message message) throws AmqpException {
                //给消息设置延迟毫秒值
                message.getMessageProperties().setExpiration(String.valueOf(delayTimes));
                return message;
            }
        });
        LOGGER.info("send delay message orderId:{}",orderId);
    }
}

（7）添加信息的消费者（接收者）

package com.zszdevelop.rabbitmqdemo.component;

import com.zszdevelop.rabbitmqdemo.service.OmsPortalOrderService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * 取消订单消息的处理者
 */
@Component
@RabbitListener(queues = "himall.order.cancel")
public class CancelOrderReceiver {
    private static Logger LOGGER =LoggerFactory.getLogger(CancelOrderReceiver.class);
    @Autowired
    private OmsPortalOrderService portalOrderService;
    @RabbitHandler
    public void handle(Long orderId){
        LOGGER.info("receive delay message orderId:{}",orderId);
        portalOrderService.cancelOrder(orderId);
    }
}

使用RabbitMQ实现订单超时取消（延迟队列）

1、整体流程

2、代码实现