RabbitMQ入门-Topic模式
发送到topic的消息不能有任意的绑定键,绑定键的规则:必须由(.)分割的单词列表。比如apple.banana.orange
绑定键也有两个特殊字符:
* 可以代替一个单词。
# 可以替代零个或多个单词。
比如:apple.# *.banana.*
生产者:
package com.example.demo; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; import com.rabbitmq.client.ConnectionFactory; import java.io.IOException; import java.util.concurrent.TimeoutException; /** * 有选择的接受消息 */ public class TopicSend { private static final String EXCHANGE_NAME = "topic_logs"; public static void main(String[] args) throws IOException, TimeoutException { ConnectionFactory factory = new ConnectionFactory(); // 连接工厂 factory.setHost("localhost"); Connection connection = factory.newConnection(); // 获取连接 Channel channel = connection.createChannel(); // topic类型 channel.exchangeDeclare(EXCHANGE_NAME, "topic"); String[] msg = {"666的兔子","懒惰的大象"}; // 第二个参数为绑定键 channel.basicPublish(EXCHANGE_NAME, "quick.orange.rabbit", null, msg[0].getBytes()); channel.basicPublish(EXCHANGE_NAME, "lazy.write.elephant", null, msg[1].getBytes()); System.out.println("PS-Send:" + msg.toString()); channel.close(); connection.close(); } }
消费者:
package com.example.demo; import com.rabbitmq.client.*; import java.io.IOException; import java.util.concurrent.TimeoutException; public class TopicReceive { private static final String EXCHANGE_NAME = "topic_logs"; public static void main(String[] args) throws IOException, TimeoutException { ConnectionFactory factory = new ConnectionFactory(); // 连接工厂 factory.setHost("localhost"); Connection connection = factory.newConnection(); // 获取连接 Channel channel = connection.createChannel(); // 声明一个topic交换类型 channel.exchangeDeclare(EXCHANGE_NAME, "topic"); // 当声明队列,不加任何参数,产生的将是一个临时队列,getQueue返回的是队列名称 String queueA = channel.queueDeclare().getQueue(); String queueB = channel.queueDeclare().getQueue(); System.out.println("临时队列:" + queueA); System.out.println("临时队列:" + queueB); // 第三个参数为“绑定建” // * 可以代替一个单词。 // # 可以替代零个或多个单词。 channel.queueBind(queueA, EXCHANGE_NAME, "*.orange.*"); channel.queueBind(queueB, EXCHANGE_NAME, "*.*.rabbit"); channel.queueBind(queueB, EXCHANGE_NAME, "lazy.#"); Consumer consumerA = new DefaultConsumer(channel) { @Override public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException { String recv = new String(body, "UTF-8"); System.out.println("Direct-Receive-A:" + recv); } }; Consumer consumerB = new DefaultConsumer(channel) { @Override public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException { String recv = new String(body, "UTF-8"); System.out.println("Direct-Receive-B:" + recv); } }; channel.basicConsume(queueA, true, consumerA); channel.basicConsume(queueB, true, consumerB); } }
先启动消费者:再启动生产者:控制台
..
第一条消息,匹配A和B
第二条消息,只匹配B
小LUA
面对敌人的严刑逼供,我一个字也没说,而是一五一十写了下来。