引言
topic exchange和direct exchange类似,都是通过routing key和binding key进行匹配,不同的是topic exchange可以为routing key设置多重标准。
direct路由器类似于sql语句中的精确查询;topic 路由器有点类似于sql语句中的模糊查询。
topic 使用通配符“*”和“#”进行routingkey的模糊匹配:
*:精确匹配一个; #:任意匹配多个
1.模型
2.创建生产者
package com.dwz.rabbitmq.exchange.topic; import java.io.IOException; import java.util.concurrent.TimeoutException; import com.dwz.rabbitmq.util.ConnectionUtils; import com.rabbitmq.client.Channel; import com.rabbitmq.client.Connection; public class Producer { public static void main(String[] args) throws IOException, TimeoutException { Connection connection = ConnectionUtils.getConnection(); Channel channel = connection.createChannel(); String exchangeName = "test_topic_exchange"; String routingKey_1 = "user.save"; String routingKey_2 = "user.update"; String routingKey_3 = "user.delete.abc"; String msg = "hello rabbitmq topic message successs!--"; channel.basicPublish(exchangeName, routingKey_1, null, (msg + routingKey_1).getBytes()); channel.basicPublish(exchangeName, routingKey_2, null, (msg + routingKey_2).getBytes()); channel.basicPublish(exchangeName, routingKey_3, null, (msg + routingKey_3).getBytes()); channel.close(); connection.close(); } }
3.创建消费者1
package com.dwz.rabbitmq.exchange.topic; import java.io.IOException; import java.util.concurrent.TimeoutException; import com.dwz.rabbitmq.util.ConnectionUtils; 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; /** * topic:模糊匹配 * @author dangwangzhen * */ public class Consumer { public static void main(String[] args) throws IOException, TimeoutException { Connection connection = ConnectionUtils.getConnection(); Channel channel = connection.createChannel(); String exchangeName = "test_topic_exchange"; String exchangeType = "topic"; String queueName = "test_topic_queue_1"; String routingKey = "user.#"; channel.exchangeDeclare(exchangeName, exchangeType, true, false, null); channel.queueDeclare(queueName, false, false, false, null); channel.queueBind(queueName, exchangeName, routingKey); 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("rec topic 1--message:" + msg); } }; channel.basicConsume(queueName, true, consumer); } }
4.创建消费者2
package com.dwz.rabbitmq.exchange.topic; import java.io.IOException; import java.util.concurrent.TimeoutException; import com.dwz.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; /** * topic:模糊匹配 * @author dangwangzhen * */ public class Consumer2 { public static void main(String[] args) throws IOException, TimeoutException { Connection connection = ConnectionUtils.getConnection(); Channel channel = connection.createChannel(); String exchangeName = "test_topic_exchange"; String exchangeType = "topic"; String queueName = "test_topic_queue_2"; String routingKey = "user.*.*"; channel.exchangeDeclare(exchangeName, exchangeType, true, false, null); channel.queueDeclare(queueName, false, false, false, null); channel.queueBind(queueName, exchangeName, routingKey); 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("rec topic2--message:" + msg); } }; channel.basicConsume(queueName, true, consumer); } }
5.运行代码
success!