rabbitmq学习记录（七）交换机Exchange-topic

实现功能：一条消息发送给多个消费者

交换机模式：topic

相比于direct匹配模式，匹配routingKey时，topic模式下不只支持彻底匹配，还支持两种特殊的匹配方式

#：能够匹配一个或多个字符

*：能够匹配一个字符

生产者：

package com.example.demo.queue.exchangeToQueue.topic;

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

import com.example.demo.utils.ConnectionUtil;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;

public class Producer {

	private static final String EXCHANGE_NAME = "exchange_topic"; 
	
	public static void main(String[] args) {
		Connection connection = null;
		Channel channel = null;
		try {
			// 获取链接
			connection = ConnectionUtil.getConnection();
			// 建立通道
			channel = connection.createChannel();
			// 声明交换机
			channel.exchangeDeclare(EXCHANGE_NAME, "topic");
			String routingKey = "debug";
			// 生产者发送的信息
			String msg = "routingKey="+routingKey;
			System.out.println("send msg : "+msg);
			// 发送信息
			channel.basicPublish(EXCHANGE_NAME, routingKey, null, msg.getBytes());
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			// 关闭通道
			try {
				channel.close();
			} catch (IOException e) {
				e.printStackTrace();
			} catch (TimeoutException e) {
				e.printStackTrace();
			}
			// 关闭链接
			try {
				connection.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		
	}
	
}

消费者1：

package com.example.demo.queue.exchangeToQueue.topic;

import java.io.IOException;

import com.example.demo.utils.ConnectionUtil;
import com.rabbitmq.client.AMQP.BasicProperties;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;

public class Consumer01 {

	private static final String EXCHANGE_NAME = "exchange_topic"; 
	
	private static final String QUEUE_NAME = "topic_exchange_to_queue_01";
	
	public static void main(String[] args) {
		try {
			// 获取链接
			Connection connection = ConnectionUtil.getConnection();
			// 建立通道
			final Channel channel = connection.createChannel();
			// 声明队列
			channel.queueDeclare(QUEUE_NAME, true, false, false, null);
			String routingKey = "debug";
			// 绑定队列到交换机
			channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, routingKey);
			// 定义消费者
			DefaultConsumer consumer = new DefaultConsumer(channel) {
				@Override
				public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body) throws IOException {
					String msg = new String(body,"UTF-8");
					System.out.println("[1]:receive msg:"+msg);
					System.out.println("[1]:deal msg successful. routingKey="+routingKey);
				}
				
			};
			// 接收信息
			channel.basicConsume(QUEUE_NAME, true, consumer);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
}

消费者2：

package com.example.demo.queue.exchangeToQueue.topic;

import java.io.IOException;

import com.example.demo.utils.ConnectionUtil;
import com.rabbitmq.client.AMQP.BasicProperties;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;

public class Consumer02 {

	private static final String EXCHANGE_NAME = "exchange_topic"; 
	
	private static final String QUEUE_NAME = "topic_exchange_to_queue_02";
	
	public static void main(String[] args) {
		try {
			// 获取链接
			Connection connection = ConnectionUtil.getConnection();
			// 建立通道
			final Channel channel = connection.createChannel();
			// 声明队列
			channel.queueDeclare(QUEUE_NAME, true, false, false, null);
			String routingKey = "debug.*";
			// 绑定队列到交换机
			channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, routingKey);
			// 定义消费者
			DefaultConsumer consumer = new DefaultConsumer(channel) {
				@Override
				public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body) throws IOException {
					String msg = new String(body,"UTF-8");
					System.out.println("[2]:receive msg:"+msg);
					System.out.println("[2]:deal msg successful. routingKey="+routingKey);
				}
			};
			// 接收信息
			channel.basicConsume(QUEUE_NAME, true, consumer);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
}

消费者3：

package com.example.demo.queue.exchangeToQueue.topic;

import java.io.IOException;

import com.example.demo.utils.ConnectionUtil;
import com.rabbitmq.client.AMQP.BasicProperties;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;

public class Consumer03 {

	private static final String EXCHANGE_NAME = "exchange_topic"; 
	
	private static final String QUEUE_NAME = "topic_exchange_to_queue_03";
	
	public static void main(String[] args) {
		try {
			// 获取链接
			Connection connection = ConnectionUtil.getConnection();
			// 建立通道
			final Channel channel = connection.createChannel();
			// 声明队列
			channel.queueDeclare(QUEUE_NAME, true, false, false, null);
			String routingKey = "debug.#";
			// 绑定队列到交换机
			channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, routingKey);
			// 定义消费者
			DefaultConsumer consumer = new DefaultConsumer(channel) {
				@Override
				public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body) throws IOException {
					String msg = new String(body,"UTF-8");
					System.out.println("[3]:receive msg:"+msg);
					System.out.println("[3]:deal msg successful. routingKey="+routingKey);
				}
			};
			// 接收信息
			channel.basicConsume(QUEUE_NAME, true, consumer);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
}

和以前同样，涉及到了交换机，而在消费者类中中并无声明交换机，因此须要先执行生产者类的main方法

接下来，咱们就能够依次执行三个消费者类的main方法，以后再执行生产者类的main方法。

生产者指定的routingKey为【debug】，而消费者指定的routingKey依次为【debug】【debug.*】【debug.#】，理论上应该只有消费者1才能收到消息。下面来展现结果：

消费者1终端：

消费者2终端：

消费者3终端：

我也看不懂了，消费者3怎么也收到了消息，晕那。。。。。。。。