RabbitMq07——主题模式（通配符模式）

    其实这个模式和上一篇路由模式极为相似，甚至可以说是大同小异，有兴趣的朋友可以先浏览上一篇以做了解https://mp.csdn.net/postedit/80964178。它只不过是它是以主题为路由的标志，然后使用通配符来进行匹配一个类型的消息。

本文详细注释已在代码中注明。

生产者

package com.mmr.rabbitmq.topics;

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

import com.mmr.rabbitmq.util.ConnectionUtils;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;

public class Send {
	
	private static final String EXCHANGE_NAME = "exchange_topic";
	
	public static void main(String[] args) throws IOException, TimeoutException {
		
		Connection connection = ConnectionUtils.getConnection();
		Channel channel = connection.createChannel();
		//声明交换机，并将交换机的类型设置为topic
		channel.exchangeDeclare(EXCHANGE_NAME, "topic");
		
		String message = "this is topic message--->";
		
		for (int i = 0; i < 50; i++) {
			//发送消息，并注明该消息的路由键，即第二个参数
//			channel.basicPublish(EXCHANGE_NAME, "user.delete", null, (message + i).getBytes());
			channel.basicPublish(EXCHANGE_NAME, "user.select", null, (message + i).getBytes());
//			channel.basicPublish(EXCHANGE_NAME, "user.insert", null, (message + i).getBytes());
			System.out.println(message + i);
		}
		channel.close();
		connection.close();	
	}
}
           

消费者1

package com.mmr.rabbitmq.topics;

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

import com.mmr.rabbitmq.util.ConnectionUtils;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
import com.rabbitmq.client.AMQP.BasicProperties;

public class RecvAll {
	
	private static final String EXCHANGE_NAME = "exchange_topic";
	private static final String QUEUE_NAME = "queue_topic_all";
	
	public static void main(String[] args) throws IOException, TimeoutException {
		
		Connection connection = ConnectionUtils.getConnection();
		final Channel channel = connection.createChannel();
		channel.queueDeclare(QUEUE_NAME, false, false, false, null);
		channel.basicQos(1);
		//绑定队列与交换机，并指定绑定的路由键
		//模糊匹配通配符有两种，（#和*）符号“#”匹配一个或多个词，符号“*”匹配不多不少一个词
		//该路由键是有通配符#
		channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "user.#");
		
		DefaultConsumer consumer = new DefaultConsumer(channel){
			
			@Override
			public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)
					throws IOException {
				try {
					String msg = new String(body, "utf-8");
					Thread.sleep(2000);
					System.out.println(msg);
				} catch (Exception e) {
					e.printStackTrace();
				}finally {
					//向MQ发送确认，告诉MQ该条消息已经消费，可以重新发送了
					//第二个参数为false表示只确认当前这一条消息，
					//如果为 true，则额外将比第一个参数指定的 delivery tag 小的消息一并确认（批量确认针对的是整个信道）
					channel.basicAck(envelope.getDeliveryTag(), false);
				}
			}
		};
		
		channel.basicConsume(QUEUE_NAME, false, consumer);	
	}
}
           

消费者2

package com.mmr.rabbitmq.topics;

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

import com.mmr.rabbitmq.util.ConnectionUtils;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
import com.rabbitmq.client.AMQP.BasicProperties;

public class RecvInsert {
	
	private static final String EXCHANGE_NAME = "exchange_topic";
	private static final String QUEUE_NAME = "queue_topic_insert";
	
	public static void main(String[] args) throws IOException, TimeoutException {
		
		Connection connection = ConnectionUtils.getConnection();
		final Channel channel = connection.createChannel();
		channel.queueDeclare(QUEUE_NAME, false, false, false, null);
		channel.basicQos(1);
		//绑定队列与交换机，并指定绑定的路由键为insert
		//同一个队列绑定交换机时可以指定多个路由键
		channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "user.insert");
		channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "user.delete");
		
		DefaultConsumer consumer = new DefaultConsumer(channel){
			
			@Override
			public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)
					throws IOException {
				try {
					String msg = new String(body, "utf-8");
					Thread.sleep(2000);
					System.out.println(msg);
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}finally {
					//向MQ发送确认，告诉MQ该条消息已经消费，可以重新发送了
					//第二个参数为false表示只确认当前这一条消息，
					//如果为 true，则额外将比第一个参数指定的 delivery tag 小的消息一并确认（批量确认针对的是整个信道）
					channel.basicAck(envelope.getDeliveryTag(), false);
				}
			}
		};
		
		channel.basicConsume(QUEUE_NAME, false, consumer);		
	}
}
           

    运行两个消费者，然后让生产者以不同的路由键来发送消息，从控制台的打印信息便能更加直观的看出来该模式的应用情况。

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