1. Topic类型和Direct类型相比，都是可以根据Routing key把消息路由绑定到不同的队列。只不过Topic类型Exchange可以让队列在绑定Routing key 的时候使用通配符。
2. Routing key 一般都是由一个或者多个单词组成，多个单词之间使用 "." 分割，例如 item.name
3. 通配符规则：
   • #: 匹配零个或多个单词
   • *: 匹配一个单词

一、生产者代码

package com.atguigu.rabbitmq.topic;  
  
import com.atguigu.rabbitmq.util.ConnectionUtil;  
import com.rabbitmq.client.BuiltinExchangeType;  
import com.rabbitmq.client.Channel;  
import com.rabbitmq.client.Connection;  
import com.rabbitmq.client.ConnectionFactory;  
  
public class Producer {  
  
    public static void main(String[] args) throws Exception {  
  
        Connection connection = ConnectionUtil.getConnection();  
  
        Channel channel = connection.createChannel();  
  
        String exchangeName = "test_topic";  
  
        channel.exchangeDeclare(exchangeName, BuiltinExchangeType.TOPIC,true,false,false,null);  
  
        String queue1Name = "test_topic_queue1";  
        String queue2Name = "test_topic_queue2";  
  
        channel.queueDeclare(queue1Name,true,false,false,null);  
        channel.queueDeclare(queue2Name,true,false,false,null);  
  
        // 绑定队列和交换机  
      // 参数1. queue：队列名称  
      // 参数2. exchange：交换机名称  
      // 参数3. routingKey：路由键,绑定规则  
      //      如果交换机的类型为fanout ,routingKey设置为""  
        // routing key 常用格式：系统的名称.日志的级别。  
        // 需求： 所有error级别的日志存入数据库,所有order系统的日志存入数据库  
        channel.queueBind(queue1Name,exchangeName,"#.error");  
        channel.queueBind(queue1Name,exchangeName,"order.*");  
        channel.queueBind(queue2Name,exchangeName,"*.*");  
  
        // 分别发送消息到队列：order.info、goods.info、goods.error  
        String body = "[所在系统：order][日志级别：info][日志内容：订单生成，保存成功]";  
        channel.basicPublish(exchangeName,"order.info",null,body.getBytes());  
  
        body = "[所在系统：goods][日志级别：info][日志内容：商品发布成功]";  
        channel.basicPublish(exchangeName,"goods.info",null,body.getBytes());  
  
        body = "[所在系统：goods][日志级别：error][日志内容：商品发布失败]";  
        channel.basicPublish(exchangeName,"goods.error",null,body.getBytes());  
  
        channel.close();  
        connection.close();  
  
    }  
  
}

二、消费者代码

1、消费者1号

消费者1监听队列1：

package com.atguigu.rabbitmq.topic;  
  
import com.atguigu.rabbitmq.util.ConnectionUtil;  
import com.rabbitmq.client.*;  
import java.io.IOException;  
  
public class Consumer1 {  
  
    public static void main(String[] args) throws Exception {  
  
        Connection connection = ConnectionUtil.getConnection();  
  
        Channel channel = connection.createChannel();  
  
        String QUEUE_NAME = "test_topic_queue1";  
  
        channel.queueDeclare(QUEUE_NAME,true,false,false,null);  
  
        Consumer consumer = new DefaultConsumer(channel){  
  
            @Override  
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {  
  
                System.out.println("body："+new String(body));  
  
            }  
  
        };  
  
        channel.basicConsume(QUEUE_NAME,true,consumer);  
  
    }  
  
}

2、消费者2号

消费者2监听队列2：

package com.atguigu.rabbitmq.topic;  
  
import com.atguigu.rabbitmq.util.ConnectionUtil;  
import com.rabbitmq.client.*;  
import java.io.IOException;  
  
public class Consumer2 {  
  
    public static void main(String[] args) throws Exception {  
  
        Connection connection = ConnectionUtil.getConnection();  
  
        Channel channel = connection.createChannel();  
  
        String QUEUE_NAME = "test_topic_queue2";  
  
        channel.queueDeclare(QUEUE_NAME,true,false,false,null);  
  
        Consumer consumer = new DefaultConsumer(channel){  
  
            @Override  
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {  
  
                System.out.println("body："+new String(body));  
  
            }  
  
        };  
  
        channel.basicConsume(QUEUE_NAME,true,consumer);  
  
    }  
  
}

三、运行效果

队列1：

img

队列2：

images