RabbitMQ的Exchange 模式之Fanout（广播模式）

该模式示意图：

这里写图片描述

服务端以fanout模式发布消息，服务端并不需要指定队列名，只需要指定特定的exchange，客户端也只需要创建一个随机队列，使该队列与exchange关联(binding)就可以接收到服务端发布的消息，这样做的好处就是同一个exchange发布的消息，不同的客户端可以进不同的处理，实现了发送方代码和消费者的代码完全解耦合

服务端java实现

package com.adtec.rabbitmq;
import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Channel;

public class EmitLog {

  private static final String EXCHANGE_NAME = "logs";

  public static void main(String[] argv) throws Exception {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();
    //EXCHANGE模式为BuiltinExchangeType.FANOUT
    channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);

    String message = "info: Hello World!";

    channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes("UTF-8"));
    System.out.println(" [x] Sent '" + message + "'");

    channel.close();
    connection.close();
  }
}

客户端java实现：

package rabbitmq;

import com.rabbitmq.client.*;

import java.io.IOException;

public class ReceiveLogs {
  private static final String EXCHANGE_NAME = "logs";

  public static void main(String[] argv) throws Exception {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();
    //创建一个名为logs的fanout类型的Exchange
    channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);
    //获取一个随机队列名
    String queueName = channel.queueDeclare().getQueue();
    //队列和Exchange进行binding
    channel.queueBind(queueName, EXCHANGE_NAME, "");

    System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
    // 监听消息
    Consumer consumer = new DefaultConsumer(channel) {
      @Override
      public void handleDelivery(String consumerTag, Envelope envelope,
                                 AMQP.BasicProperties properties, byte[] body) throws IOException {
        String message = new String(body, "UTF-8");
        System.out.println(" [x] Received '" + message + "'");
      }
    };
    channel.basicConsume(queueName, true, consumer);
  }
}

运行时先启动客户端，在启动服务端。

RabbitMQ的Exchange 模式之Fanout（广播模式）

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