RabbitMQ四种Exchange类型之Topic (Java)

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Topic类型的Exchange是要进行路由键匹配的。此时需要通过路由键将队列绑定要一个交换器上。规则如下：

• 符号“#”匹配一个或多个词，例如：“logs.#”能够匹配到“logs.error”、“logs.info.toc”
• 符号“*”只能匹配一个词。例如：“logs.*” 只能匹配到“logs.error”,不能匹配到“logs.info.toc” 。

 

如下图：

下面就直接上代码吧！！

Consumer：

package topic;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;


public class TopicConsumer {

	private static final String EXCHANGE_NAME 	= "exchange_topic";
	public static void main(String[] argv) throws IOException, TimeoutException  {
		
		new ExchangeTopic("logs.info");
		new ExchangeTopic("logs.*");
		new ExchangeTopic("logs.#");
	}

	static class ExchangeTopic{
		public  ExchangeTopic(final String routingKey) throws IOException, TimeoutException {
			ConnectionFactory factory = new ConnectionFactory();
			//rabbitmq监听IP
			factory.setHost("192.168.249.128");
			//rabbitmq监听默认端口
			factory.setPort(5672);
			//设置访问的用户
			factory.setUsername("test");
			factory.setPassword("test");
			Connection connection = factory.newConnection();
			Channel channel = connection.createChannel();
			//声明路由名字和类型
			channel.exchangeDeclare(EXCHANGE_NAME, "topic", false, true, null);
			//队列名称
			String queueName = routingKey + ".queue";
			//创建队列
			channel.queueDeclare(queueName, false, false, true, null);
			//把队列绑定到路由上
			channel.queueBind(queueName, EXCHANGE_NAME, routingKey);

			System.out.println(" [routingKey = "+ routingKey +"] Waiting for msg....");

			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("[routingKey = "+ routingKey +"] Received msg is '" + message + "'");
				}
			};
			channel.basicConsume(queueName, true, consumer);
		}

	}

}

Producer：

package topic;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

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


public class TopicProducer {

	private static final String EXCHANGE_NAME = "exchange_topic";

	public static void main(String[] argv) throws Exception{
		new ExchangeTopic("logs.info", "logs Info test ！！");
		new ExchangeTopic("logs.error", "logs error test ！！");
		new ExchangeTopic("logs.error.toc", "logs error toc test ！！");
	}
	
	static class ExchangeTopic{
		public ExchangeTopic(String routingKey,String message) throws IOException, TimeoutException{
			ConnectionFactory factory = new ConnectionFactory();
			//rabbitmq监听IP
			factory.setHost("192.168.249.128");
			//rabbitmq监听默认端口
			factory.setPort(5672);
			//设置访问的用户
			factory.setUsername("test");
			factory.setPassword("test");
			Connection connection = factory.newConnection();
			Channel channel = connection.createChannel();

			//声明路由名字和类型
			channel.exchangeDeclare(EXCHANGE_NAME, "topic", false, true, null);
			
			channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes());
			System.out.println("[routingKey = "+routingKey+"] Sent msg is '" + message + "'");

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

}

结果：

 

从结果中可以看出，路由键为"logs.info"只匹配到了Producer路由键是"logs.info"的信息，路由键为"logs.*"则匹配到了Producer路由键是"logs.info","logs.error"两条信息，而路由键为"logs.#"则匹配到了Producer路由键是"logs.info","logs.error","logs.error.toc"三条信息。

 

祝生活愉快！！！