RabbitMq topic

目錄

概述

代碼

結果

---

概述

上篇direct必須是生產者發佈消息指定的routingKey和消費者在隊列綁定時指定的routingKey完全相等時才能匹配到隊列上。topic與direct不同,可以進行模糊匹配。topic交換機的消息不能隨意的設置選擇routingKey，必須是由點隔開的一系列的標識符組成。標識符可以是任何東西，但是一般都與消息的某些特性相關。例子：“link.orange.rabbit”,你可以定義任何數量的標識符，上限爲255個字節

匹配規則：

*  其中星號可以代替一個單詞

#  可以替代零個或更多的單詞，只要能模糊匹配上就能將消息映射到隊列中。當一個隊列的綁定鍵爲#的時候，這個隊列將會無視消息的路由鍵，接收所有的消息

注：隊列1 將接受warn相關的消息

      隊列2 將接受info 相關消息 debugger所有消息

代碼

生產者

package com.ll.mq.hellomq.topic;

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

/**
 * 
 * @author ll 生產者
 *
 */
public class Producer {


	public static void main(String[] args) {
		try {
			ConnectionFactory factory = new ConnectionFactory();
			factory.setHost("127.0.0.1");
			factory.setPort(5672);
			factory.setUsername("kysc");
			factory.setPassword("123456");
			Connection connection = factory.newConnection();
			Channel channel = connection.createChannel();

			// Routing 的路由規則使用直連接
			String EXCHANGE_NAME = "exchange.topic";
			String[] routingKeys = { "link.warn.rabbit", "link.warn.elephant", "debugger.info"};
			for (String routingKey : routingKeys) {
				String message = "Hello RabbitMQ - " + routingKey;
				System.out.println(message);
				channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes("UTF-8"));
			}
			// 關閉資源
			channel.close();
			connection.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

消費者1

package com.ll.mq.hellomq.topic;

import java.io.IOException;

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;
/**
 * 
 * @author ll 消費者1
 *
 */
public class ConsumerOne {

	static String EXCHANGE_NAME = "exchange.topic";
    static String QUEUE_NAME = "queue.topic.q1";
	public static void main(String[] argv) throws Exception {
		ConnectionFactory factory = new ConnectionFactory();
		factory.setHost("localhost");
		factory.setPort(5672);
		factory.setUsername("kysc");
		factory.setPassword("123456");
		Connection connection = factory.newConnection();
		Channel channel = connection.createChannel();
		// 聲明交換機類型
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        channel.exchangeDeclare(EXCHANGE_NAME, "topic");

        String[] routingKeys = {"*.warn.*"};
        for (int i = 0; i < routingKeys.length; i++) {
            channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, routingKeys[i]);
        }

        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(" [C] ConsumerOne '" + message + "', 接受...");
            }
        };

        channel.basicConsume(QUEUE_NAME, true, consumer);
	}
}

消費者2

package com.ll.mq.hellomq.topic;

import java.io.IOException;

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;
/**
 * 
 * @author ll 消費者2
 *
 */
public class ConsumerTwo {

	static String EXCHANGE_NAME = "exchange.topic";
    static String QUEUE_NAME = "queue.topic.q2";
	public static void main(String[] argv) throws Exception {
		ConnectionFactory factory = new ConnectionFactory();
		factory.setHost("localhost");
		factory.setPort(5672);
		factory.setUsername("kysc");
		factory.setPassword("123456");
		Connection connection = factory.newConnection();
		Channel channel = connection.createChannel();
		// 聲明交換機類型
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        channel.exchangeDeclare(EXCHANGE_NAME, "topic");

        String[] routingKeys = {"debugger.#"};
        for (int i = 0; i < routingKeys.length; i++) {
            channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, routingKeys[i]);
        }

        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(" [C] ConsumerTwo '" + message + "', 接受中...");
            }
        };

        channel.basicConsume(QUEUE_NAME, true, consumer);
	}
}

 

結果

生產者：Hello RabbitMQ - link.warn.rabbit
              Hello RabbitMQ - link.warn.elephant
              Hello RabbitMQ - debugger.info

消費者1  [C] ConsumerOne 'Hello RabbitMQ - link.warn.rabbit', 接受...
               [C] ConsumerOne 'Hello RabbitMQ - link.warn.elephant', 接受...

消費者2  [C] ConsumerTwo 'Hello RabbitMQ - debugger.info', 接受中...

下一篇 https://blog.csdn.net/lilongwangyamin/article/details/105118955 rabbitmq rpc遠程過程調用