超简单的RabbitMq实现订单超时自动取消-Toy模板网

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很简单的实现方法，大家帮忙看看能不能继续完善。

rabbitmq死信队列订单超时,java-rabbitmq,rabbitmq,springboot

步骤：

添加rabbitmq配置
添加rabbitmq配置类
添加订单生产者
添加订单消费者（修改状态）

1、添加rabbitmq配置

注意一定要开启手动应答，不然可能会报错

spring  
  rabbitmq:
    host: 你的地址
    port: 5672
    username: admin
    password: admin
    listener:
      simple:
#        开启手动应答
        acknowledge-mode: manual

2、添加rabbitmq配置类

下面这段代码看着有点繁琐，我解释一下逻辑关系。

rabbitmq死信队列订单超时,java-rabbitmq,rabbitmq,springboot

1、声明订单交换机、声明订单队列，在订单队列中声明绑定的死信交换机

2、订单交换机Binding订单队列

3、声明死信交换机、队列并且Binding

package com.lutao.config;

import com.rabbitmq.client.AMQP;
import org.springframework.amqp.core.*;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.HashMap;

@Configuration
public class RabbitMqConfig {

    public static final String ORDER_QUEUE = "order_queue";
    public static final String ORDER_EXCHANGE = "order_exchange";
    public static final String ORDER_DEAD_EXCHANGE = "order_dead_exchange";
    public static final String ORDER_DEAD_QUEUE = "order_dead_queue";
    public static final String ORDER_ROUTING = "order_routing";
    public static final String ORDER_DEAD_ROUTING = "order_dead_routing";
    /**
     * 订单交换机
     */
    @Bean("orderExchange")
    public DirectExchange getOrderExchange(){
        return new DirectExchange(ORDER_EXCHANGE);
    }
    /**
     * 订单队列
     */
    @Bean("orderQueue")
    public Queue getOrderQueue(){
        HashMap<String, Object> map = new HashMap<>(3);
        map.put("x-dead-letter-exchange",ORDER_DEAD_EXCHANGE);
        map.put("x-dead-letter-routing-key",ORDER_DEAD_ROUTING);
        map.put("x-message-ttl",30000);
        return QueueBuilder.durable(ORDER_QUEUE).withArguments(map).build();
    }

    /**
     * 订单交换机与订单队列绑定
     */
    @Bean
    public Binding oExchangeBindingO(
            @Qualifier("orderExchange") DirectExchange exchange,
            @Qualifier("orderQueue") Queue queue
    ){
        return BindingBuilder.bind(queue).to(exchange).with(ORDER_ROUTING);
    }
    /**
     * 死信交换机
     */
    @Bean("orderDeadExchange")
    public DirectExchange getOrderDeadExchange(){
        return new DirectExchange(ORDER_DEAD_EXCHANGE);
    }
    /**
     * 死信队列
     */
    @Bean("orderDeadQueue")
    public Queue getOrderDradQueue(){
        return new Queue(ORDER_DEAD_QUEUE,true,false,false,null);
    }

    @Bean
    public Binding deadExchangeDead(
            @Qualifier("orderDeadExchange") DirectExchange exchange,
            @Qualifier("orderDeadQueue") Queue queue
    ){
        return BindingBuilder.bind(queue).to(exchange).with(ORDER_DEAD_ROUTING);
    }
}

3、添加订单生产者

在插入新订单数据时，向订单队列发送一条延迟时间为30秒的信息

@Override
    @Transactional
    public void insertOrder(OT ot) {
        Orders orders = new Orders();
        BeanUtils.copyProperties(ot, orders);
        List<CartVO> listCart = ot.getListCart();
        //生成订单号
        String onumber = get16UUID();
        orders.setOnumber(onumber);
        ordersMapper.insertOrder(orders);
        //删除购物车
        Integer[] cids = new Integer[listCart.size()];
        for (int i = 0; i < listCart.size(); i++) {
            CartVO cartVO = listCart.get(i);
            ordersMapper.insertGoods(onumber, cartVO);
            cids[i] = listCart.get(i).getCid();
        }
        //发送到队列中
        //将订单编号发送到队列中
        log.info("将订单编号发送到订单队列中");
        rabbitTemplate.convertAndSend(RabbitMqConfig.ORDER_EXCHANGE,RabbitMqConfig.ORDER_ROUTING,orders.getOnumber());
        cartMapper.deleteCid(cids);
    }

4、死信队列消费者处理信息

30秒后订单进入死信队列，由消费者消费，根据订单号查询订单的状态如果还是0（未支付）则将状态更新成（2）已取消。文章来源地址https://www.toymoban.com/news/detail-679328.html

@Autowired
    private OrdersMapper ordersMapper;
    /**
     * 判断是否在规定时间内支付
     *
     * @param message
     * @param channel
     * @throws IOException
     */
    @RabbitListener(queues = RabbitMqConfig.ORDER_DEAD_QUEUE)
    public void receive(Message message, Channel channel) throws IOException {
        log.info("订单进入死信队列");
        String msg = new String(message.getBody());
        log.info("订单号："+msg);
        OrderPageRequest request = new OrderPageRequest();
        request.setOnumber(msg);
        Integer status = ordersMapper.getStatusByONumber(msg);
        if (status != null && status == 0){
            ordersMapper.updateStatus(msg,2);
        }
        //应答
        channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
    }

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