RabbitMQ学习之路由（java）

来源：互联网发布：淘宝京东抓图工具编辑：程序博客网时间：2024/05/22 12:26

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。

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