Management details of the bean spring

The control object to spring to manage,

 

spring对bean的管理细节
        1、创建的三种方式
        2、bean镀锡的作用范围
        3、bean对象的什么周期

 

1. Three ways to create

       <!--    第一种方式，适用默认构造方法创建
               在spring的配置文件中适用bean标签，配以id和class属性之后,且没有其他属性和标签时，
               采用的就是默认构造函数创建bean对象，此时如果类中没有默认构造函数,则对象无法创建。
       -->
       <!--<bean id="getInstance" class="com.spring.service.impl.AccountServiceImpl"></bean>-->
   
       <!-- 第二种方式, 使用普通工厂中的方法创建对象(使用某个类中的方法创建对象,并存入spring容器)  -->
   <!--    <bean id="instanceFactory" class="com.spring.factory.InstanceFactory"></bean>
       <bean id="getInstance" factory-bean="instanceFactory" factory-method="getAccountDao"></bean>-->
   
   
       <!-- 第三种方式,使用工厂中的静态方法创建对象(使用某个类中的静态方法创建对象,并存入spring容器) -->
         <bean id="getInstance" class="com.spring.factory.StaticFactory" factory-method="getAccountDao"></bean>

2. bean adjustment range of action
   
   

   scope bean tag label,
   Function: Used to specify the scope bean
   Value:
       singleton: (default) singleton
       prototype: Multi embodiment
       request: requesting application range acting wen
       session: session scope is acting in web application
       global-session: When acting on the scope of the session cluster environment (global session scope), does not make a cluster environment, he is the session

3. What bean object cycle
   
   

   Singleton object
        Birth: When the container to create objects of birth
        Alive: as long as the container is still the object has been alive
        Death: container destroyed, the object of death
        Summary: The same container, and life cycle of singletons
   Many cases of Object
        Birth: When we use the object to create a framework for our spring
        Alive: as long as the object is in use has been alive
        Death: When the object is not a long time, and no other object references, the process of java garbage collection