RabbitMQ点对点的原理和使用

RabbitMQ点对点的原理和使用

1、点对点模式  一对一模式。  一个生产者投递消息给队列 只能允许有一个消费者进行消费    如果集群的话 会进行均摊消费   服务器配置不一样 均摊就不优了 

      

   长连接 不用三次握手之类的 提高传输效率     但是长连接占服务器带宽

推：  消费者已经启动了，建立长连接，一旦生产者向队列投递消息会立马推送给消费者

取： 生产者先投递消息队列进行缓存，这时候消费者再次启动时候 ，就会向队列获取消息。

 

pom：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.toov5</groupId>
  <artifactId>rabbitmq</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  	<dependencies>
		<dependency>
			<groupId>com.rabbitmq</groupId>
			<artifactId>amqp-client</artifactId>
			<version>3.6.5</version>
		</dependency>
	</dependencies>
  
</project>

　创建连接的工具类：

package com.toov5.utils;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
 
//没有做成单例的  VirtualHost 需要复用
public class MQConnectionUtils {
    //创建新的连接
    public static Connection newConnection() throws IOException, TimeoutException {
         //创建连接工厂
    ConnectionFactory factory= new ConnectionFactory();
    //链接地址
    factory.setHost("192.168.91.6");
    //用户名称
    factory.setUsername("admin");
    //用户密码
    factory.setPassword("admin");
    //amqp端口号
    factory.setPort(5672);
    //连接virtualhost
    factory.setVirtualHost("/admin_toov5");
    Connection connection = factory.newConnection();
        return connection;
    }
    
    
}

Producer类

package com.toov5.Producer;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.toov5.utils.MQConnectionUtils;

public class Producer {
    //队列名称
    private static final String UEUE_NAME = "test_queue";
    
    public static void main(String[] args) throws IOException, TimeoutException {
        //创建新的连接
    Connection connection = MQConnectionUtils.newConnection();
       //创建Channel
        Channel channel = connection.createChannel();
        //创建队列
        channel.queueDeclare(UEUE_NAME, false, false, false, null);
        //创建message
        String msg = "toov5_message";
        System.out.println("生产者投递消息"+msg);
        //生产者发送消息
        channel.basicPublish("",UEUE_NAME, null, msg.getBytes());
        //关闭通道和连接
         channel.close();
         connection.close();
    }
}

 

运行结果

模拟get message

 

 

 producer跟consumer基本类似

package com.toov5.Consumer;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

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;
import com.toov5.utils.MQConnectionUtils;

public class Consumer {
  
     //队列名称
        private static final String QUEUE_NAME = "test_queue";
        
        public static void main(String[] args) throws IOException, TimeoutException {
            System.out.println("消费者启动..........");
            //创建新的连接
        Connection connection = MQConnectionUtils.newConnection();
           //创建Channel
            Channel channel = connection.createChannel();
            // 消费者关联队列
            channel.queueDeclare(QUEUE_NAME, false, false, false, null);
            
              DefaultConsumer defaultConsumerr = new DefaultConsumer(channel) {
                  //监听获取消息
                    @Override
                    public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties,
                            byte[] body) throws IOException {
                        String msg =new String(body,"UTF-8");
                        System.out.println("消费者获取生产者消息："+msg);
                    }
              };
            //牵手模式设置  默认自动应答模式  true:自动应答模式  
              channel.basicConsume(QUEUE_NAME, true, defaultConsumerr);              
              
//            //关闭通道和连接
//             channel.close();
//             connection.close();
        }
}

运行后的结果：