（转）RabbitMQ学习之路由（java）

http://blog.csdn.net/zhu_tianwei/article/details/40887755

参考：http://blog.csdn.NET/lmj623565791/article/details/37669573

使用direct类型实现：消息会被推送至绑定键（binding key）和消息发布附带的选择键（routing key）完全匹配的队列。例如：将不同的日志发送到不同的消费端。

1.发送日志端SendLogDirect.Java

package cn.slimsmart.rabbitmq.demo.route;

import java.util.Random;
import java.util.UUID;

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

//随机发送6条随机类型（routing key）的日志给转发器~~
public class SendLogDirect {

     //交换名称
     private static final String EXCHANGE_NAME = "ex_logs_direct";
     //日志分类
     private static final String[] SEVERITIES = { "info", "warning", "error" };

    public static void main(String[] args) throws Exception {
        //创建连接和频道
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.101.174");
        // 指定用户 密码
        factory.setUsername("admin");
        factory.setPassword("admin");
        // 指定端口
        factory.setPort(AMQP.PROTOCOL.PORT);
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        // 声明转发器的类型
        channel.exchangeDeclare(EXCHANGE_NAME, "direct");

        //发送6条消息
        for (int i = 0; i < 6; i++)
        {
            String severity = getSeverity();
            String message = severity + "_log :" + UUID.randomUUID().toString();
            // 发布消息至转发器，指定routingkey
            channel.basicPublish(EXCHANGE_NAME, severity, null, message  .getBytes());
            System.out.println(" [x] Sent '" + message + "'");
        }

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

    /**
     * 随机产生一种日志类型
     *
     * @return
     */
    private static String getSeverity()
    {
        Random random = new Random();
        int ranVal = random.nextInt(3);
        return SEVERITIES[ranVal];
    }

}

2.接收日志端ReceiveLogsDirect.java

package cn.slimsmart.rabbitmq.demo.route;

import java.util.Random;

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

//接收端随机设置一个日志严重级别（binding_key）。。。
public class ReceiveLogsDirect {

    private static final String EXCHANGE_NAME = "ex_logs_direct";
    private static final String[] SEVERITIES = { "info", "warning", "error" };

    public static void main(String[] args) throws Exception {
          // 创建连接和频道
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.101.174");
        // 指定用户 密码
        factory.setUsername("admin");
        factory.setPassword("admin");
        // 指定端口
        factory.setPort(AMQP.PROTOCOL.PORT);
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        // 声明direct类型转发器
        channel.exchangeDeclare(EXCHANGE_NAME, "direct");

        String queueName = channel.queueDeclare().getQueue();
        String severity = getSeverity();
        // 指定binding_key
        channel.queueBind(queueName, EXCHANGE_NAME, severity);
        System.out.println(" [*] Waiting for "+severity+" logs. To exit press CTRL+C");

        QueueingConsumer consumer = new QueueingConsumer(channel);
        channel.basicConsume(queueName, true, consumer);

        while (true)
        {
            QueueingConsumer.Delivery delivery = consumer.nextDelivery();
            String message = new String(delivery.getBody());

            System.out.println(" [x] Received '" + message + "'");
        }
    }

    /**
     * 随机产生一种日志类型
     *
     * @return
     */
    private static String getSeverity()
    {
        Random random = new Random();
        int ranVal = random.nextInt(3);
        return SEVERITIES[ranVal];
    }
}

启动几个接收端服务，再启动发送端，接收端对应绑定的键收到对应的消息。

注：发送消息时可以设置routing_key，接收队列与转发器间可以设置binding_key，接收者接收与binding_key与routing_key相同的消息。