119、商城业务---订单服务---创建业务交换机、队列等

1、导入依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>

2、编写连接rabbitmq的配置

3、开启rabbitmq功能

4、rabbitmq使用json序列化机制并设置回调

package com.gulimall.ware.config;

import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;

@Configuration
public class MyRabbitConfig {

    @Autowired
    private RabbitTemplate rabbitTemplate;

    /**
     * json序列化格式
     * @return
     */
    @Bean
    public MessageConverter messageConverter(){
        return new Jackson2JsonMessageConverter();
    }

    /**
     * 定制RabbitTemplate
     */
    @PostConstruct //在MyRabbitConfig对象创建完成后执行这个方法
    public void initRabbitTemplate(){
        //设置确认回调
        rabbitTemplate.setConfirmCallback(new RabbitTemplate.ConfirmCallback() {
            /**
             * 1、只要消息抵达Broker就ack=true
             * correlationData：当前消息的唯一关联数据(这个是消息的唯一id)
             * ack：消息是否成功收到
             * cause：失败的原因
             */
            @Override
            public void confirm(CorrelationData correlationData, boolean ack, String cause) {
                System.out.println("confirm...correlationData["+correlationData+"]==>ack:["+ack+"]==>cause:["+cause+"]");
            }
        });

        //设置消息发送到队列的回调（只有发送失败才会回调）
        rabbitTemplate.setReturnCallback(new RabbitTemplate.ReturnCallback() {
            /**
             * 只要消息【没有】投递给指定的队列，就触发这个失败回调
             * message：投递失败的消息详细信息
             * replyCode：回复的状态码
             * replyText：回复的文本内容
             * exchange：当时这个消息发给哪个交换机
             * routingKey：当时这个消息用哪个路邮键
             */
            @Override
            public void returnedMessage(Message message, int replyCode, String replyText, String exchange, String routingKey) {
                System.out.println("Fail Message["+message+"]==>replyCode["+replyCode+"]" +
                        "==>replyText["+replyText+"]==>exchange["+exchange+"]==>routingKey["+routingKey+"]");
            }
        });
    }
}

5、编写创建队列、交换机、绑定的配置类

package com.gulimall.ware.config;

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

import java.util.HashMap;
import java.util.Map;

/**
 * 创建队列、交换机、绑定
 */
@Configuration
public class MyRabbitMqConfig {
    /**
     * 监听消息【这个方法的编写是为了重启ware服务后能发现没有下面的交换机、队列、绑定，他就会自己创建】
     */
    @RabbitListener(queues = "stock.release.stock.queue")
    public void listener(Message message){
        //不做任何处理
    }

    /**
     * 交换机
     * @return
     */
    @Bean
    public Exchange stockEventExchange(){
        //String name, boolean durable, boolean autoDelete, Map<String, Object> arguments
        return new TopicExchange("stock-event-exchange",true, false);
    }

    /**
     * 普通队列
     */
    @Bean
    public Queue stockReleaseStockQueue(){
        //String name, boolean durable, boolean exclusive, boolean autoDelete, Map<String, Object> arguments
        return new Queue("stock.release.stock.queue", true, false, false);
    }

    /**
     * 死信队列
     * @return
     */
    @Bean
    public Queue orderDelayQueue(){
        /**
         * 配置参数
         * x-dead-letter-exchange: stock-event-exchange
         * x-dead-letter-routing-key: order.release
         * x-message-ttl: 60000
         */
        Map<String, Object> arguments = new HashMap<>();
        arguments.put("x-dead-letter-exchange", "stock-event-exchange");//死信路由到order-event-exchange交换机
        arguments.put("x-dead-letter-routing-key", "stock.release");//死信路由键
        arguments.put("x-message-ttl", 120000);//消息过期时间(2min)

        /**
         * String name, boolean durable, boolean exclusive, boolean autoDelete, Map<String, Object> arguments
         */
        Queue queue = new Queue("stock.delay.queue", true, false, false, arguments);
        return queue;
    }

    /**
     * 绑定
     */
    @Bean
    public Binding stockReleaseBinding(){
        /**
         * String destination, DestinationType destinationType, String exchange, String routingKey, Map<String, Object> arguments
         */
        return new Binding("stock.release.stock.queue", Binding.DestinationType.QUEUE, "stock-event-exchange", "stock.release.#", null);
    }

    /**
     * 绑定
     */
    @Bean
    public Binding stockDelayBinding(){
        /**
         * String destination, DestinationType destinationType, String exchange, String routingKey, Map<String, Object> arguments
         */
        return new Binding("stock.delay.queue", Binding.DestinationType.QUEUE, "stock-event-exchange", "stock.locked", null);
    }
}