RabbitMQ点对点的原理和使用

比眉伴天荒 2022-01-28 13:17 182阅读 0赞

# [RabbitMQ点对点的原理和使用][RabbitMQ] #

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

![1179709-20181110141927464-597888139.png][]

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

![1179709-20181110165217496-2143921832.png][]

模拟get message

![1179709-20181110165251353-1007949110.png][]

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：

![1179709-20181110191249495-1064757451.png][]

[RabbitMQ]: https://www.cnblogs.com/toov5/p/9940297.html
[1179709-20181110141927464-597888139.png]: /images/20220128/b50b9d9b4424450491338ae99a0da4fa.png
[1179709-20181110165217496-2143921832.png]: /images/20220128/52023107a3494be9aba2758374c19a0a.png
[1179709-20181110165251353-1007949110.png]: /images/20220128/1ac96e2f7b3f4f6b956984819ee27e1d.png
[1179709-20181110191249495-1064757451.png]: /images/20220128/c084d7e2af374be6a4b4aee8bdaa5029.png