RabbitMQ示例生产者消费者（二）——Exchange fanout方式

本文主要参考：

http://www.rabbitmq.com/tutorials/tutorial-three-java.html

好，先介绍一下本篇文章中的主要内容。

本文主要介绍的是通过fanout的exchange方式，进行生产，消费端通过binding操作，对queue和exchange进行绑定，然后消费。

好，下面看一下代码：

生产者：

package com.xueyou.demo;import com.rabbitmq.client.Channel;import com.rabbitmq.client.Connection;import com.rabbitmq.client.ConnectionFactory;/** * Created by wuxueyou on 2017/8/20. */public class AppPublish {    private final static String EXCHANGE_NAME = "log-exchange";    public static void main(String[] args) throws Exception {        ConnectionFactory factory = new ConnectionFactory();        factory.setHost("192.168.0.99");        factory.setPort(5672);        factory.setUsername("admin");        factory.setPassword("admin");        Connection connection = factory.newConnection();        Channel channel = connection.createChannel();        channel.exchangeDeclare(EXCHANGE_NAME,"fanout");        int i = 10000;        while (i-- > 0) {            String message = "hey this is the loginfo " + i;            channel.basicPublish(EXCHANGE_NAME,"", null, message.getBytes());            System.out.println("sent message:" + message);            Thread.sleep(100);        }        channel.close();        connection.close();    }}

消费者：

package com.xueyou.demo;import com.rabbitmq.client.*;import java.io.IOException;/** * Created by wuxueyou on 2017/8/20. */public class AppSubScribe {    private final static String EXCHANGE_NAME = "log-exchange";    public static void main(String[] args) throws Exception {        ConnectionFactory factory = new ConnectionFactory();        factory.setHost("192.168.0.99");        factory.setPort(5672);        factory.setUsername("admin");        factory.setPassword("admin");        Connection connection = factory.newConnection();        Channel channel = connection.createChannel();        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");        String queueName = channel.queueDeclare().getQueue();        channel.queueBind(queueName, EXCHANGE_NAME, "");        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("receive message :" + message);            }        };        channel.basicConsume(queueName, true, consumer);    }}

在生产者和消费者端需要注意的是：生产者端使用的是fanout的方式，所以在进行发送的时候只需要进行exchange的声明，而不需要对routingkey进行指定；而消费者端是这样，消费者端需要声明一个queue，同时把queue和exchange进行绑定，这样才能进行消费。

fanout方式是这样，是一种广播的方式，只要和exchange绑定的queue都能够接受到exchange发送的消息，而且每个queue中的内容都是全量的。