《Pro Spring》学习笔记之DestroySinglton()自动调用

Spring中的destruction回调的唯一缺陷是无法自动触发，必须手动的 DestroySinglton()调用，如果我们使用的是servlet，大可以在servlet的destroy方法中进行调用，如果我们是单机应用程序，尤其是有多个退出点，就比较难办了，这是，我们可以为此作一个线程，加载到Runtime中，这样DestroySinglton()就会在程序结束时候自动调用了

 

ShutDownHook.java

 

package ch5.destroy;

import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

public class ShutDownHook implements Runnable ...{
    
    private ConfigurableListableBeanFactory configurableListableBeanFactory;
    public ShutDownHook(ConfigurableListableBeanFactory configurableListableBeanFactory)...{
        this.configurableListableBeanFactory=configurableListableBeanFactory;
    }
    public void run() ...{
        System.out.println("Destroy begin");
        configurableListableBeanFactory.destroySingletons();
        System.out.println("Destroy success");
    }

}

 

SimpleBean.java

 

package ch5.destroy;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;

public class SimpleBean implements InitializingBean,DisposableBean ...{
  public void afterPropertiesSet() throws Exception ...{
        System.out.println("this is info from afterpropertiesSet from SimpleBean");
    }
private  String name;
  private String sex;
  private String age;
  public void destroyMethod()...{
      System.out.println("this is info from customer destroy method");
  }
  public void destroy()...{
      System.out.println("this is info from destroy method");
  }
public String getAge() ...{
    return age;
}
public void setAge(String age) ...{
    this.age = age;
}
public String getName() ...{
    return name;
}
public void setName(String name) ...{
    this.name = name;
}
public String getSex() ...{
    return sex;
}
public void setSex(String sex) ...{
    this.sex = sex;
}
}

 

测试代码：已经注释掉了显示调用destroySingletons的代码：

 

package ch5.destroy;

import java.io.File;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;

public class TestSpring...{
  public static void main(String args[])  throws Exception...{
      //获取bean factory
      ConfigurableListableBeanFactory factory=(ConfigurableListableBeanFactory)getBeanFactory();  //使用子beanFactory
     
     
      SimpleBean bean1=(SimpleBean)factory.getBean("SimpleBean");
      Runtime.getRuntime().addShutdownHook(new Thread(new ShutDownHook(factory)));
//      System.out.println("before destroy");
//      factory.destroySingletons();
//      System.out.println("after destory");

  }
  public static BeanFactory getBeanFactory()...{
      //获取bean factory
      String realpath="";
   
         //加载配置项
      realpath=System.getProperty("user.dir")+File.separator+"src"+File.separator+"ch5/destroy"+File.separator+"applicationContext.xml";
  
     
      ConfigurableListableBeanFactory  factory=new XmlBeanFactory(new FileSystemResource(realpath));
      
      return factory;
  }
}

 

运行结果：

this is info from afterpropertiesSet from SimpleBean
Destroy begin
this is info from destroy method
this is info from customer destroy method
Destroy success

发现是何显示调用一样的