非常感谢 http://wubin850219.iteye.com/blog/1004973
在前面的《rabbitmq学习4:Routing 》中使用一般的名字的路由，现在想通过一些路由规则让消费者来接受符合规则的消息？那应当怎么样呢？那就要用到类型为topic的Exchange了。
Topics的工作示意图如下：
我们可能从图中看到有*和#两个通配符。*表示通配一个词；#表示通配0个或多个词。
下面让我们来看看Topics的程序如何实现的吧!
P端的程序如下 ：
java代码
package com.abin.rabbitmq; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import com.rabbitmq.client.ConnectionFactory; public class EmitLogTopic { PRivate static final String EXCHANGE_NAME = "topic_logs"; public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.exchangeDeclare(EXCHANGE_NAME, "topic");//声明topic类型的Exchange String routingKeyOne = "logs.error.one";// 定义一个路由名为“error” for (int i = 0; i <= 1; i++) { String messageOne = "this is one error logs:" + i; channel.basicPublish(EXCHANGE_NAME, routingKeyOne, null, messageOne .getBytes()); System.out.println(" [x] Sent '" + routingKeyOne + "':'" + messageOne + "'"); } System.out.println("################################"); String routingKeyTwo = "logs.error.two"; for (int i = 0; i <= 2; i++) { String messageTwo = "this is two error logs:" + i; channel.basicPublish(EXCHANGE_NAME, routingKeyTwo, null, messageTwo .getBytes()); System.out.println(" [x] Sent '" + routingKeyTwo + "':'" + messageTwo + "'"); } System.out.println("################################"); String routingKeyThree = "logs.info.one"; for (int i = 0; i <= 3; i++) { String messageThree = "this is one info logs:" + i; channel.basicPublish(EXCHANGE_NAME, routingKeyThree, null, messageThree.getBytes()); System.out.println(" [x] Sent '" + routingKeyThree + "':'" + messageThree + "'"); } channel.close(); connection.close(); } }
运行结果可能如下：
Java代码 [x] Sent 'logs.error.one':'this is one error logs:0' [x] Sent 'logs.error.one':'this is one error logs:1' ################################ [x] Sent 'logs.error.two':'this is two error logs:0' [x] Sent 'logs.error.two':'this is two error logs:1' [x] Sent 'logs.error.two':'this is two error logs:2' ################################ [x] Sent 'logs.info.one':'this is one info logs:0' [x] Sent 'logs.info.one':'this is one info logs:1' [x] Sent 'logs.info.one':'this is one info logs:2' [x] Sent 'logs.info.one':'this is one info logs:3'
第一个C端的代码如下：
Java代码package com.abin.rabbitmq; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import com.rabbitmq.client.ConnectionFactory; import com.rabbitmq.client.QueueingConsumer; public class ReceiveLogsTopic { private static final String EXCHANGE_NAME = "topic_logs";// 定义Exchange名称 public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.exchangeDeclare(EXCHANGE_NAME, "topic");// 声明topic类型的Exchange String queueName = "queue_topic_logs1";// 定义队列名为“queue_topic_logs1”的Queue channel.queueDeclare(queueName, false, false, false, null); // String routingKeyOne = "*.error.two";// "error"路由规则 // channel.queueBind(queueName, EXCHANGE_NAME, routingKeyOne);// 把Queue、Exchange及路由绑定 String routingKeyTwo = "logs.*.one";//通配所有logs下第三词（最后一个）词为one的消息 channel.queueBind(queueName, EXCHANGE_NAME, routingKeyTwo); System.out.println(" [*] Waiting for messages."); QueueingConsumer consumer = new QueueingConsumer(channel); channel.basicConsume(queueName, true, consumer); while (true) { QueueingConsumer.Delivery delivery = consumer.nextDelivery(); String message = new String(delivery.getBody()); String routingKey = delivery.getEnvelope().getRoutingKey(); System.out.println(" [x] Received '" + routingKey + "':'" + message + "'"); } } }
第一个C端的运行结果如下：
Java代码[*] Waiting for messages. [x] Received 'logs.error.one':'this is one error logs:0' [x] Received 'logs.error.one':'this is one error logs:1' [x] Received 'logs.info.one':'this is one info logs:0' [x] Received 'logs.info.one':'this is one info logs:1' [x] Received 'logs.info.one':'this is one info logs:2' [x] Received 'logs.info.one':'this is one info logs:3'
第二个C端的程序如下：
Java代码package com.abin.rabbitmq; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import com.rabbitmq.client.ConnectionFactory; import com.rabbitmq.client.QueueingConsumer; public class ReceiveLogsTopicTwo { private static final String EXCHANGE_NAME = "topic_logs";//定义Exchange名称 public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.exchangeDeclare(EXCHANGE_NAME, "topic");//声明topic类型的Exchange String queueName = "queue_topic_logs2";//定义队列名为“queue_topic_logs2”的Queue channel.queueDeclare(queueName, false, false, false, null); String routingKeyOne = "logs.#";//通配所有logs下的消息 channel.queueBind(queueName, EXCHANGE_NAME, routingKeyOne);//把Queue、Exchange及路由绑定 System.out.println(" [*] Waiting for messages."); QueueingConsumer consumer = new QueueingConsumer(channel); channel.basicConsume(queueName, true, consumer); while (true) { QueueingConsumer.Delivery delivery = consumer.nextDelivery(); String message = new String(delivery.getBody()); String routingKey = delivery.getEnvelope().getRoutingKey(); System.out.println(" [x] Received '" + routingKey + "':'" + message + "'"); } } }
第二个C端的运行结果如下：
Java代码[*] Waiting for messages. [x] Received 'logs.error.one':'this is one error logs:0' [x] Received 'logs.error.one':'this is one error logs:1' [x] Received 'logs.error.two':'this is two error logs:0' [x] Received 'logs.error.two':'this is two error logs:1' [x] Received 'logs.error.two':'this is two error logs:2' [x] Received 'logs.info.one':'this is one info logs:0' [x] Received 'logs.info.one':'this is one info logs:1' [x] Received 'logs.info.one':'this is one info logs:2' [x] Received 'logs.info.one':'this is one info logs:3'
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