RabbitMQ实例（三）——使用direct方式，带有Routingkey方式

本文主要介绍的是使用direct方式的Exchange来进行发布和订阅。

direct方式的exchange首先需要制定direct方式，然后需要指定routingkey，最后绑定消费关系，然后开始发布和订阅。下面看一下官方的例子。

发布：

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 AppPublishWithRouting {    private final static String EXCHANGE_NAME = "direct-logs";    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, "direct");        String message = "black message";        channel.basicPublish(EXCHANGE_NAME, "black", null, message.getBytes());        System.out.println(message);        String message2 = "red message";        channel.basicPublish(EXCHANGE_NAME, "red", null, message2.getBytes());        System.out.println(message2);        channel.close();        connection.close();    }}

订阅：

package com.xueyou.demo;import com.rabbitmq.client.*;import java.io.IOException;/** * Created by wuxueyou on 2017/8/20. */public class AppSubScribeWithRouting {    private final static String EXCHANGE_NAME = "direct-logs";    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, "direct");        String queueName = channel.queueDeclare().getQueue();        channel.queueBind(queueName, EXCHANGE_NAME, "black");        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);    }}

这里发布和订阅的时候都需要指定要生产到哪里和要从哪里消费，也就是说routingkey。那么routingkey可以指定多个吗？是可以的。如图：

能够看到，一个channel是可以有多个routingkey的，这样能够灵活的指定发布和订阅消息。
具体的关系，可以看下图：