- 路由选择(Routing)
使用direct转发器,在转发器上使用同一routingkey绑定多个队列,根据routingkey发送消息,所有绑定的队列都将收到消息
- 注意要点
direct转发器,把消息直接转发到绑定routingkey的队列:
channel.exchangeDeclare("direct_logs", "direct"); channel.basicPublish("direct_logs", severity , null, SerializationUtils.serialize(object));
转发器与队列的绑定(指定routingkey):
//在绑定临时队列和转发器时指定routingkey channel.queueBind(queueName, "direct_logs", severity);
工作队列中使用的默认转发器,转发器也是direct,工作队列是同一队列上声明多个consumer并行;Routing是用在转发器上同一routingkey绑定多个队列(刚开始没有理解)
- 消息发送类
package com.demo.mq.rabbitmq.example04; import java.io.IOException; import java.io.Serializable; import java.util.Random; import org.apache.commons.lang3.SerializationUtils; import com.demo.mq.rabbitmq.MqManager; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; /** * 发送消息类 * @author sheungxin * */ public class Send{ /** * 发送消息,direct转发器,通过routingKey匹配相应的queue * @param object 消息主体 * @throws IOException */ public static void sendAToB(Serializable object) throws Exception{ Connection conn=MqManager.newConnection(); Channel channel=conn.createChannel(); channel.exchangeDeclare("direct_logs", "direct"); for(int i=0;i<4;i++){ String severity=getSeverity(); channel.basicPublish("direct_logs", severity , null, SerializationUtils.serialize(object)); System.out.println(severity+":Send '"+object+"'"); } channel.close(); conn.close(); } private static String getSeverity(){ String[] severities=new String[]{"info","warn","error"}; Random random=new Random(); return severities[random.nextInt(3)]; } public static void main(String[] args) throws Exception { sendAToB("Hello World !"); } }
- 消息接收类
package com.demo.mq.rabbitmq.example04; import java.io.IOException; import java.util.Random; import org.apache.commons.lang3.SerializationUtils; import com.demo.mq.rabbitmq.MqManager; import com.rabbitmq.client.AMQP; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import com.rabbitmq.client.Consumer; import com.rabbitmq.client.DefaultConsumer; import com.rabbitmq.client.Envelope; /** * 接收消息类 * @author sheungxin * */ public class Recv { /** * 用于接收消息,创建一个临时队列,绑定在转发器direct上,并指定routingKey * @param queue * @throws Exception */ public static void recvAToB() throws Exception{ Connection conn=MqManager.newConnection(); Channel channel=conn.createChannel(); channel.exchangeDeclare("direct_logs", "direct"); //创建一个临时队列 String queueName=channel.queueDeclare().getQueue(); //绑定临时队列和转发器logs String severity=getSeverity(); channel.queueBind(queueName, "direct_logs", severity); System.out.println(severity+":Received ..."); Consumer consumer=new DefaultConsumer(channel){ @Override public void handleDelivery(String consumerTag,Envelope envelope,AMQP.BasicProperties properties,byte[] body) throws IOException{ String mes=SerializationUtils.deserialize(body); System.out.println(envelope.getRoutingKey()+":Received :'"+mes+"' done"); } }; //关闭自动应答机制,默认开启;这时候需要手动进行应该 channel.basicConsume(queueName, true, consumer); } private static String getSeverity(){ String[] severities=new String[]{"info","warn","error"}; Random random=new Random(); return severities[random.nextInt(3)]; } public static void main(String[] args) throws Exception { recvAToB(); } }