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spring初始化、销毁容器时指定执行的方法

2017-03-05 23:04 471 查看
关于在spring  容器初始化 bean 和销毁前所做的操作定义方式有三种:
通过@PostConstruct 和 @PreDestroy 方法 实现初始化和销毁bean之前进行的操作

通过 在xml中定义init-method 和  destory-method方法

通过bean实现InitializingBean和 DisposableBean接口

 
1、@PostConstruct 和 @PreDestroy 方法:
1)实现类:
public classPersonService { 

    private String  message; 
 
    public String getMessage() { 

        return message; 

    } 
    public void setMessage(String message){ 

        this.message = message; 

    } 
     
    @PostConstruct 
    public void init(){ 

        System.out.println("I'm  init method  using  @PostConstrut...."+message); 

    } 
     
    @PreDestroy 
    public void dostory(){ 

        System.out.println("I'm  destory method  using @PreDestroy....."+message); 

    } 

2)配置:
<?xmlversion="1.0" encoding="UTF-8"?> 

<beansxmlns="http://www.springframework.org/schema/beans" 

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xmlns:context="http://www.springframework.org/schema/context" 

xsi:schemaLocation="http://www.springframework.org/schema/beans 

http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 

http://www.springframework.org/schema/context 

http://www.springframework.org/schema/context/spring-context-3.1.xsd"> 

 
<context:annotation-config/> 

 
<beanid="personService"class="com.myapp.core.annotation.init.PersonService"> 

  <property name="message"value="123"></property> 
</bean> 
 
</beans>
3)测试:
public static voidmain(String[] args) { 

        ApplicationContext  context = newClassPathXmlApplicationContext("resource/annotation.xml"); 

        PersonService   personService  = (PersonService)context.getBean("personService"); 

         
        personService.dostory(); 


输出:
I'm  init method  using  @PostConstrut....123
I'm  destory method  using @PreDestroy.....123
 
2、在xml中定义init-method 和  destory-method方法:
1)实现类:
public classPersonService  { 

    private String  message; 
 
    public String getMessage() { 

        return message; 

    } 
    public void setMessage(String message){ 

        this.message = message; 

    } 
 
    public void init(){ 

       System.out.println("init"); 
    } 
   
    public void cleanUp(){ 

       System.out.println("cleanUp"); 
    } 
}
2)配置:
<beanid="personService"class="com.myapp.core.beanscope.PersonService"scope="singleton" init-method="init" destroy-method="cleanUp"> </bean> 

3)测试:
public static voidmain(String[] args) { 

       
    AbstractApplicationContext  context =new ClassPathXmlApplicationContext("SpringBeans.xml"); 

    PersonService  person =(PersonService)context.getBean("personService"); 

    person.setMessage("hello  spring"); 

     
    PersonService  person_new =(PersonService)context.getBean("personService"); 

     
   System.out.println(person.getMessage()); 
   System.out.println(person_new.getMessage()); 

   

context.registerShutdownHook(); 

输出:
init
hello  spring
hello  spring
cleanUp
注:context.registerShutdownHook();是一个钩子方法,当jvm关闭退出的时候会调用这个钩子方法,在设计模式之模板模式中
通过在抽象类中定义这样的钩子方法由实现类进行实现,这里的实现类是AbstractApplicationContext,这是spring 容器优雅关闭的方法。
 
3、实现InitializingBean和 DisposableBean接口:
1)定义相应类实现InitializingBean ,DisposableBean接口:
public classPersonService  implementsInitializingBean,DisposableBean{ 

    private String  message; 
 
    public String getMessage() { 

        return message; 

    } 
    public void setMessage(String message){ 

        this.message = message; 

    } 
 
    @Override 
    public void destroy() throws Exception{ 

        // TODO Auto-generated method stub 

        System.out.println("I'm  init method  using implementsInitializingBean interface...."+message); 
         
    } 
 
    @Override 
    public void afterPropertiesSet() throwsException { 

        // TODO Auto-generated method stub 

        System.out.println("I'm  init method  using implementsDisposableBean interface...."+message);  
    } 
}
2)配置:
<?xmlversion="1.0" encoding="UTF-8"?> 

<beansxmlns="http://www.springframework.org/schema/beans" 

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xmlns:context="http://www.springframework.org/schema/context" 

xsi:schemaLocation="http://www.springframework.org/schema/beans 

http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 

http://www.springframework.org/schema/context 

http://www.springframework.org/schema/context/spring-context-3.1.xsd"> 

 
<beanid="personService"class="com.myapp.core.annotation.init.PersonService"> 

          <property name="message"value="123"></property> 
</bean> 
</beans>
3)测试:
public static voidmain(String[] args) { 

         
        AbstractApplicationContext  context = newClassPathXmlApplicationContext("resource/annotation.xml"); 

        PersonService   personService  = (PersonService)context.getBean("personService"); 

         
        context.registerShutdownHook(); 

}
输出:
I'm  init method  using implementsDisposableBean interface....123 

三月 16, 2013 5:06:34下午 org.springframework.context.support.AbstractApplicationContext doClose 

INFO: Closingorg.springframework.context.support.ClassPathXmlApplicationContext@205756:startup date [Sat Mar 16 17:06:30 CST 2013]; root of context hierarchy 

I'm  init method  using implementsInitializingBean interface....123  
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