RabbitMQ-topic

上一篇文章讲的direct类型转换器,可以选择性接收日志.这样改进了日志系统,但是这有个问题,就是它是完整匹配的.比如说路由键是dog,只有被标记为dog的消息才被转发. 想转发个dog.xxx,那是不可以的.还是不够灵活.
那么topic转发器,就可以做到了
例子:
消费者(只接受以kwy开头的内容)

package com.tgb.kwy.topics;

import com.rabbitmq.client.*;

import java.io.IOException;

/**
 * Description
 *
 * @author kongwy [email protected]
 * @version 1.0
 * @date 2018-07-10-16 -15
 */
public class ReceiveLogsTopic {
    private static final String EXCHANGE_NAME="topic_logs";
    public static void main(String[] args) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("192.168.159.132");/*设置rabbitmq所在主机ip或主机名*/
        /*指定用户名和密码*/
        factory.setUsername("admin");
        factory.setPassword("admin");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        channel.exchangeDeclare(EXCHANGE_NAME,"topic");
        String queueName=channel.queueDeclare().getQueue();
        channel.queueBind(queueName,EXCHANGE_NAME,"kwy.*");//这个是重点

        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        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(" [x] Received '" + envelope.getRoutingKey() + "':'" + message + "'");
            }
        };
        channel.basicConsume(queueName, true, consumer);
    }
}

生产者

package com.tgb.kwy.topics;

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

import java.util.UUID;

/**
 * Description
 *
 * @author kongwy [email protected]
 * @version 1.0
 * @date 2018-07-10-16 -09
 */
public class EmitLogTopic {
    private static final String EXCHANGE_NAME="topic_logs";

    public static void main(String[] args) throws Exception{
        ConnectionFactory factory=new ConnectionFactory();
        factory.setHost("192.168.159.132");/*设置rabbitmq所在主机ip或主机名*/
        /*指定用户名和密码*/
        factory.setUsername("admin");
        factory.setPassword("admin");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        channel.exchangeDeclare(EXCHANGE_NAME,"topic");
        //定义绑定键
        String[] routing_keys = new String[] { "kwy.info", "odelia.warning",
                "auth.info", "kwy.critical" };
        for(String routing_key:routing_keys){
            String msg=UUID.randomUUID().toString();
            channel.basicPublish(EXCHANGE_NAME,routing_key,null,msg.getBytes());
            System.out.println(" [x] Sent routingKey = "+routing_key+" ,msg = " + msg + ".");
        }
        channel.close();
        connection.close();
    }
}

运行效果
生成者

消费者

注:代码来自官网.官网对于概念性的内容,讲解的还是很清楚的