RabbitMQ的消息持久化处理

1、RabbitMQ的消息持久化处理，消息的可靠性是 RabbitMQ 的一大特色，那么 RabbitMQ 是如何保证消息可靠性的呢——消息持久化。

2、autoDelete属性的理解。

　　1）、@Queue: 当autoDelete属性设置到该注解的时候，含义即是，当所有消费者客户端连接断开后，是否自动删除队列，当设置值是true的时候删除该队列，当值是false的时候不删除该队列。

　　2）、@Exchange：当autoDelete属性设置到该注解的时候，含义即是，当所有绑定队列都不在使用时，是否自动删除交换器，当设置值是true的时候删除该交换器，当值是false的时候不删除该交换器。

3、之前写过RabbitMQ的交换器Exchange之direct（发布与订阅 完全匹配），这里借助这个进行消息持久化测试。生产者的代码不发生改变，这里只是将消费者的autoDelete = "true"属性修改为autoDelete = "false"，进行对比测试。

Info级别的日志进行消息的持久化操作，即队列不进行自动删除。将autoDelete = "false"即可。

 package com.example.bie.consumer;

 import org.springframework.amqp.core.ExchangeTypes;
 import org.springframework.amqp.rabbit.annotation.Exchange;
 import org.springframework.amqp.rabbit.annotation.Queue;
 import org.springframework.amqp.rabbit.annotation.QueueBinding;
 import org.springframework.amqp.rabbit.annotation.RabbitHandler;
 import org.springframework.amqp.rabbit.annotation.RabbitListener;
 import org.springframework.stereotype.Component;

 /**
  *
  * @author biehl
  *
  *         消息接收者
  *
  *         1、@RabbitListener bindings:绑定队列
  *
  *         2、@QueueBinding
  *         value:绑定队列的名称、exchange:配置交换器、key:路由键routing-key绑定队列和交换器
  *
  *         3、@Queue value:配置队列名称、autoDelete:是否是一个可删除的临时队列
  *
  *         4、@Exchange value:为交换器起个名称、type:指定具体的交换器类型
  *
  *
  */
 @Component
 @RabbitListener(bindings = @QueueBinding(

         value = @Queue(value = "${rabbitmq.config.queue.info}", autoDelete = "false"),

         exchange = @Exchange(value = "${rabbitmq.config.exchange}", type = ExchangeTypes.DIRECT),

         key = "${rabbitmq.config.queue.info.routing.key}"))
 public class LogInfoConsumer {

     /**
      * 接收消息的方法,采用消息队列监听机制.
      *
      * @RabbitHandler意思是将注解@RabbitListener配置到类上面
      *
      * @RabbitHandler是指定这个方法可以进行消息的接收并且消费.
      *
      * @param msg
      */
     @RabbitHandler
     public void consumer(String msg) {
         // 打印消息
         System.out.println("INFO消费者===>消费: " + msg);
     }

 }

Error级别的日志进行消息的持久化操作，即队列进行自动删除。将autoDelete = "true"即可。

 package com.example.bie.consumer;

 import org.springframework.amqp.core.ExchangeTypes;
 import org.springframework.amqp.rabbit.annotation.Exchange;
 import org.springframework.amqp.rabbit.annotation.Queue;
 import org.springframework.amqp.rabbit.annotation.QueueBinding;
 import org.springframework.amqp.rabbit.annotation.RabbitHandler;
 import org.springframework.amqp.rabbit.annotation.RabbitListener;
 import org.springframework.stereotype.Component;

 /**
  *
  * @author biehl
  *
  *         消息接收者
  *
  *         1、@RabbitListener bindings:绑定队列
  *
  *         2、@QueueBinding
  *         value:绑定队列的名称、exchange:配置交换器、key:路由键routing-key绑定队列和交换器
  *
  *         3、@Queue value:配置队列名称、autoDelete:是否是一个可删除的临时队列
  *
  *         4、@Exchange value:为交换器起个名称、type:指定具体的交换器类型
  *
  *
  */
 @Component
 @RabbitListener(bindings = @QueueBinding(

         value = @Queue(value = "${rabbitmq.config.queue.error}", autoDelete = "true"),

         exchange = @Exchange(value = "${rabbitmq.config.exchange}", type = ExchangeTypes.DIRECT),

         key = "${rabbitmq.config.queue.error.routing.key}"))
 public class LogErrorConsumer {

     /**
      * 接收消息的方法,采用消息队列监听机制.
      *
      * @RabbitHandler意思是将注解@RabbitListener配置到类上面
      *
      * @RabbitHandler是指定这个方法可以进行消息的接收并且消费.
      *
      * @param msg
      */
     @RabbitHandler
     public void consumer(String msg) {
         // 打印消息
         System.out.println("ERROR消费者===>消费<===消息message: " + msg);
     }

 }

4、启动你的生产者，启动你的消费者，观察RabbitMQ的图形化界面。未生产消息、未消费消息的界面如下所示：

生产消息、消费消息的界面如下所示，我这里还使用浏览器访问控制层触发生产者生产消息，消费者消费消息：

现在停止你的消费者，记录消息到第几条消息了。方便再次启动消费者进行观察。

启动你的消费者，观察，看看是从第几条开始消费的。可以看到消息从第82条开始消费的。

　　RabbitMQ的消息持久化处理，Ready是对未接收到的数据状态表示，如果RabbitMQ在队列里面存放的消息未被消费者所消费，那么会给未消费的消息加一个标记，表示当前这个消息未被消费。消息持久化处理解决了丢失消息的这种状况，我们可以接收到消息，就是因为队列一直存在着呢，但是手动删除队列，消息也就丢失了，所以要慎重操作。当消费者停止以后，生产者生产的消息存储在RabbitMQ的服务器内存中，队列也存在内存中，数据在队列中，即数据保存在内存中。但是如果RabbitMQ的服务都停止了，队列也就消失了，队列消失了，数据也就丢失了。

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作者：别先生

博客园：https://www.cnblogs.com/biehongli/

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