spring boot整合RabbitMQ（Fanout模式）

Posted 2020-09-14 牛头人

1.Fanout Exchange介绍
Fanout Exchange 消息广播的模式，不管路由键或者是路由模式，会把消息发给绑定给它的全部队列，如果配置了routing_key会被忽略。

如上图所示，即当使用fanout交换器时，他会将消息广播到与该交换器绑定的所有队列上，这有利于你对单条消息做不同的反应。
例如存在以下场景：一个web服务要在用户完善信息时，获得积分奖励，这样你就可以创建两个对列，一个用来处理用户信息的请求，另一个对列获取这条消息是来完成积分奖励的任务。

2.代码示例

1）.Queue配置类

FanoutRabbitConfig.java类：

package com.example.rabbitmqfanout;

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;

@Configuration
public class FanoutRabbitConfig {
    //创建队列
    @Bean
    public Queue AMessage() {
        return new Queue("fanout.A");
    }
    //创建队列
    @Bean
    public Queue BMessage() {
        return new Queue("fanout.B");
    }
    //创建队列
    @Bean
    public Queue CMessage() {
        return new Queue("fanout.C");
    }
    //创建Fanout交换器
    @Bean
    FanoutExchange fanoutExchange() {
        return new FanoutExchange("fanoutExchange");
    }
    //将对列绑定到Fanout交换器
    @Bean
    Binding bindingExchangeA(Queue AMessage,FanoutExchange fanoutExchange) {
        return BindingBuilder.bind(AMessage).to(fanoutExchange);
    }
    //将对列绑定到Fanout交换器
    @Bean
    Binding bindingExchangeB(Queue BMessage, FanoutExchange fanoutExchange) {
        return BindingBuilder.bind(BMessage).to(fanoutExchange);
    }
    //将对列绑定到Fanout交换器
    @Bean
    Binding bindingExchangeC(Queue CMessage, FanoutExchange fanoutExchange) {
        return BindingBuilder.bind(CMessage).to(fanoutExchange);
    }    
}
2）.消息生产者

FanoutSender.java类:

package com.example.rabbitmqfanout.rabbitmq;

import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class FanoutSender {
    @Autowired
    private AmqpTemplate rabbitTemplate;

    public void send() {
        String context = "hi, fanout msg ";
        System.out.println("Sender : " + context);
        this.rabbitTemplate.convertAndSend("fanoutExchange","", context);
    }
}

3）.消息消费者

FanoutReceiverA.java类：

package com.example.rabbitmqfanout.rabbitmq;

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

@Component
@RabbitListener(queues = "fanout.A")
public class FanoutReceiverA {
     @RabbitHandler
     public void process(String message) {
         System.out.println("fanout Receiver A  : " + message);
    }
}

FanoutReceiverB.java类：

package com.example.rabbitmqfanout.rabbitmq;

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

@Component
@RabbitListener(queues = "fanout.B")
public class FanoutReceiverB {
    @RabbitHandler
    public void process(String message) {
        System.out.println("fanout Receiver B: " + message);
    }
}

FanoutReceiverC.java类：

package com.example.rabbitmqfanout.rabbitmq;

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

@Component
@RabbitListener(queues = "fanout.C")
public class FanoutReceiverC {
    @RabbitHandler
    public void process(String message) {
        System.out.println("fanout Receiver C: " + message);
    }
}
4）.测试

FanoutTest.java类：

package com.example.rabbitmqfanout.rabbitmq;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class FanoutTest {
    @Autowired
    private FanoutSender sender;

    @Test
    public void fanoutSender() throws Exception {
        sender.send();
    }
}