spring boot整合RabbitMQ（Fanout模式）

1.Fanout Exchange介紹
Fanout Exchange 消息廣播的模式，不管路由鍵或者是路由模式，會把消息發給綁定給它的全部隊列，如果配置了routing_key會被忽略。

如上圖所示，即當使用fanout交換器時，他會將消息廣播到與該交換器綁定的所有隊列上，這有利於你對單條消息做不同的反應。
例如存在以下場景：一個web服務要在用戶完善信息時，獲得積分獎勵，這樣你就可以創建兩個對列，一個用來處理用戶信息的請求，另一個對列獲取這條消息是來完成積分獎勵的任務。

2.代碼示例

1）.Queue配置類

FanoutRabbitConfig.java類：

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 {
    //創建隊列
    @Bean
    public Queue AMessage() {
        return new Queue("fanout.A");
    }
    //創建隊列
    @Bean
    public Queue BMessage() {
        return new Queue("fanout.B");
    }
    //創建隊列
    @Bean
    public Queue CMessage() {
        return new Queue("fanout.C");
    }
    //創建Fanout交換器
    @Bean
    FanoutExchange fanoutExchange() {
        return new FanoutExchange("fanoutExchange");
    }
    //將對列綁定到Fanout交換器
    @Bean
    Binding bindingExchangeA(Queue AMessage,FanoutExchange fanoutExchange) {
        return BindingBuilder.bind(AMessage).to(fanoutExchange);
    }
    //將對列綁定到Fanout交換器
    @Bean
    Binding bindingExchangeB(Queue BMessage, FanoutExchange fanoutExchange) {
        return BindingBuilder.bind(BMessage).to(fanoutExchange);
    }
    //將對列綁定到Fanout交換器
    @Bean
    Binding bindingExchangeC(Queue CMessage, FanoutExchange fanoutExchange) {
        return BindingBuilder.bind(CMessage).to(fanoutExchange);
    }    
}
2）.消息生產者

FanoutSender.java類:

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）.消息消費者

FanoutReceiverA.java類：

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類：

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類：

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）.測試

FanoutTest.java類：

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();
    }
}