Spring bean destroy-method，singleton和prototype范围 [英] Spring bean destroy-method , singleton and prototype scopes

问题描述

我是Spring框架的新手，从一些教程开始学习它。

I am new to the spring framework, started with some tutorials to learn it.

我有以下文件，

＃MainProgram.java

# MainProgram.java

package test.spring;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainProgram {
        public static void main(String[] args) {
              AbstractApplicationContext context = 
                              new ClassPathXmlApplicationContext("Bean.xml");     
              HelloSpring obj = (HelloSpring) context.getBean("helloSpring");
              obj.setMessage("My message");
              obj.getMessage();
              context.registerShutdownHook();

        }
 }

＃HelloSpring.java

# HelloSpring.java

package test.spring;

public class HelloSpring   {
     private String message;

     public void setMessage(String message){
      this.message  = message;
      System.out.println("Inside setMessage");
   }

   public void getMessage(){
      System.out.println("Your Message : " + this.message);
   }

   public void xmlInit() {
    System.out.println("xml configured  initialize");
   } 

    public void xmlDestroy() {
    System.out.println("xml configured destroy");
    }

  }

＃Bean.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

     <bean id="helloSpring" class="test.spring.HelloSpring" 
          scope="prototype" init-method="xmlInit" destroy-method="xmlDestroy">

     </bean>
     </beans>

当我拿 scope =singleton我的输出是：

 xml configured  initialize
 Inside setMessage
 Your Message : My message
 xml configured destroy

当我拿 scope =prototype我的输出是：

 xml configured  initialize
 Inside setMessage
 Your Message : My message

xmlDestroy（）使用<$调用方法c $ c> singleton 范围bean但没有原型
请帮助我以下，

xmlDestroy() method is called with singleton scope bean but not with prototype kindly help me for the following ,

这是对的吗？如果是这样，可能的原因是什么？

Is this correct? if so, what would be possible reasons?

我也有一些问题，如

有什么区别或者
之间的关系ApplicationContext，AbstractApplicationContext和ClassPathXmlApplicationContext

推荐答案

xmlDestroy（）使用单例范围bean调用方法但不使用原型调用方法，因为

xmlDestroy() method is called with singleton scope bean but not with prototype because

Spring无法管理整个生命周期原型bean：容器实例化，配置，装饰和组装原型对象，将其交给客户端，然后不再了解该原型实例。为了释放资源，尝试实现自定义bean后处理器。

Spring does not manage the complete lifecycle of a prototype bean: the container instantiates, configures, decorates and otherwise assembles a prototype object, hands it to the client and then has no further knowledge of that prototype instance. For releasing resources try to implement a custom bean post processor.

与弹簧容器管理完整生命周期的单件bean不同

Unlike singleton beans where the spring container manages the complete life-cycle

你可以看看这个关于不同背景之间差异的基本教程

You can have a look at this basic tutorial for differences between different contexts

参考文档

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