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发布订阅模型:

MQ提供了很多交换机模型 其中常用的有下边三个:

Fanout:广播

Direct:路由

Topic:话题

转换器只负责消息路由，不是存储，路由失败则消息丢失

Fanout Exchange:会将接收到的消息路由导每一个跟其绑定的queue.

利用SpringAMQP演示FanoutExchange的使用:

实现代码:

在consumer编写工具类，实现交换机和队列的绑定:

package cn.itcast.mq.configu;import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.FanoutExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** @className:cn.itcast.mq.configu.BindExchangeToQueue* @description:by-li* @author:Administrator* @create:2024-05-1116:33*/
@Configuration
public class BindExchangeToQueue {//声明交换机@Beanpublic FanoutExchange fanoutExchange() {return new FanoutExchange("itcast.fanout");}//生命queue@Beanpublic Queue fanoutqueue1() {return new Queue("itcast.queue1");}@Beanpublic Queue fanoutqueue2() {return new Queue("itcast.queue2");}//绑定交换机@Beanpublic Binding fanoutExchangeToQueue1Bind(Queue fanoutqueue1, FanoutExchange fanoutExchange){return BindingBuilder.bind(fanoutqueue1).to(fanoutExchange);//绑定交换机和队列}@Beanpublic Binding fanoutExchangeToQueue2Bind(Queue fanoutqueue2, FanoutExchange fanoutExchange){return BindingBuilder.bind(fanoutqueue2).to(fanoutExchange);//绑定交换机和队列}}

在consumer实体类里编写接收两个队列请求的方法:

    @RabbitListener(queues = "itcast.queue1")public void lintestFanoutExchangeToQueue1(String mes) throws InterruptedException {System.out.println("从队列1中获取到了消息:"+mes);Thread.sleep(200);}@RabbitListener(queues = "itcast.queue2")public void lintestFanoutExchangeToQueue2(String mes) throws InterruptedException {System.out.println("从队列2中获取到了消息:"+mes);Thread.sleep(200);}

在publisher里编写测试方法 模拟给交换机发送消息:

//给FanoutExchange交换机发送消息@Testpublic void testFanoutExchangeSend(){String FanoutChangeName = "itcast.fanout";String msg="我是fannout发送的消息";rabbitTemplate.convertAndSend(FanoutChangeName,"",msg);}

然后发送请求和启动consumer类，在控制台查看:

这里看到我们只发送了一条消息，但是两个consumer消费者都接收到了消息，能看出来Fanout Exchange交换机将收到的消息发到了给他绑定的两个queue里了

总结：