RabbitMq消息队列之FanoutExchange模式

一 . FanoutExchange模式

Fanout是路由广播的形式,将会把消息发给绑定它的全部队列,即便设置了key,也会被忽略.

二 .

1.导包

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

2. 在yaml文件中配置rabbitMq的基本配置；

server:
  port: 8080
spring:
  application:
    name: springboot_rabbitmq_topic
  rabbitmq:
    host: localhost
    port: 5672
    username: guest
    password: guest

3. 书写RabbitMq的配置类：

a . 创建对类queue

b . 创建交换机TopicExchange

c . 根据相应的规则将队列绑定到交换机上

package com.zdj.rabbitmq;

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.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * Created by Administrator on 2018/4/13.
 */
@Configuration
public class RabbitMqConfig {
    /**
     * 创建三个队列   一个fanoutexchange路由器（交换机），将三个队列分别绑定到交换机上去
     * @return
     */

    //  a. 创建队列
    @Bean(name = "Amessage")
    public Queue AMessage(){
        return new Queue("fanout.A");
    }

    @Bean(name = "Bmessage")
    public Queue BMessage(){
        return new Queue("fanout.B");
    }

    @Bean(name = "Cmessage")
    public Queue CMessage(){
        return new Queue("fanout.C");
    }

    // b.  创建交换机 FanoutExchange

    @Bean
    FanoutExchange fanoutExchange(){
        return new FanoutExchange("fanoutExchange"); //  配置广播路由器
    }

    // c.  按照规则绑定 队列Queue 和 交换机 fanoutExchange
    /*
        将 队列 queue  绑定到 交换机 exchange上去，返回一个BindingBuilder对象
     */
    @Bean
    Binding bindingExchangeA(@Qualifier("Amessage")Queue aqueue,FanoutExchange exchange){
        return BindingBuilder.bind(aqueue).to(exchange);
    }

    @Bean
    Binding bindingExchangeB(@Qualifier("Bmessage")Queue bqueue,FanoutExchange exchange){
        return BindingBuilder.bind(bqueue).to(exchange);
    }

    @Bean
    Binding bindingExchangeC(@Qualifier("Cmessage")Queue cqueue,FanoutExchange exchange){
        return BindingBuilder.bind(cqueue).to(exchange);
    }

}

4. 创建消息发送类 AmqpTemplate

package com.zdj.rabbitmq;

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

/**
 * Created by Administrator on 2018/4/13.
 */

@Component
public class RabbitMqSender {

    @Autowired
    private AmqpTemplate amqpTemplate;

    /*
      第一个参数  交换机名称
      第二个参数  绑定规则
      第三个参数  发送的消息
      因为这里是fanoutExchange ,即使配置了发送的routing_key也是不起作用的，故此处直接忽略参数2
     */

    public void sendeMessage(){
        amqpTemplate.convertAndSend("fanoutExchange","","这是fanoutExchange传递的消息");
    }

}

5. 创建消息发送测试类

package com.zdj.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;

// 测试类模拟测试发送消息
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootRabbitmq0413ApplicationTests {

	@Autowired
	private RabbitMqSender rabbitMqSender;

	@Test
	public void contextLoads() {
		rabbitMqSender.sendeMessage();
	}

}

6. 创建消息接收类

package com.zdj.rabbitmq;

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

/**
 * Created by Administrator on 2018/4/13.
 */

@Component
public class RabbitReceiver {

    @RabbitListener(queues = "fanout.A")
    public void receiverA(){
        System.out.println("我接收的是fanout.A队列的消息");
    }

    @RabbitListener(queues = "fanout.B")
    public void receiverB(){
        System.out.println("我接收的是fanout.B队列的消息");
    }

    @RabbitListener(queues = "fanout.C")
    public void receiverC(){
        System.out.println("我接收的是fanout.C队列的消息");
    }

}

7. 测试：

（1）启动消息接收类主应用

（2）启动消息测试类发送消息

（3）分析：

FanoutExchange模式下，广播订阅，是向所有的消费者发布消息，但是只有消费者将队列绑定到该路由器才能收到消息，忽略routing_key的；

RabbitMq消息队列之FanoutExchange模式

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