Spring4.0 Study Notes (5)--Managing the bean's life cycle

Spring IOC Container manages bean lifecycle, Spring allows custom tasks to be performed at specific points in the bean lifecycle

The process by which the Spring IOC container manages the bean's life cycle:

1. Create an instance of the bean through a constructor or factory method

2. Set values for bean properties and references to other beans

3. Initialize method of invoking Bean

4, beans can use the

5. When the container is closed, the method of destroying the bean is called

Bean file

 Packagecom.spring.cycle; Public classCar { PublicCar () {System.out.println ("Car ' s constructor ..."); } @Override PublicString toString () {return"Car [brand=" + Brand + "]"; }    PrivateString brand;  Public voidSetbrand (String brand) {System.out.println ("Setbrand ...");  This. Brand =brand; }         Public voidinit () {System.out.println ("Init ..."); }         Public voiddestroy () {System.out.println ("Destroy ..."); }    }

Configuration file

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"xmlns:p= "http://www.springframework.org/schema/p"xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">    <BeanID= "Car"class= "Com.spring.cycle.Car"Init-method= "Init"Destroy-method= "Destroy">        < Propertyname= "Brand"value= "Audi"></ Property>    </Bean>        <Beanclass= "Com.spring.cycle.MyBeanPostProcesser">    </Bean></Beans>

 Packagecom.spring.cycle;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext; Public classMain { Public Static voidMain (string[] args) {Classpathxmlapplicationcontext ctx=NewClasspathxmlapplicationcontext ("Bean-cycle.xml"); Car Car= (CAR) ctx.getbean ("Car"));        SYSTEM.OUT.PRINTLN (car); //Close IOC ContainerCtx.close (); }}

Postprocessafterinitialization and Postprocessbeforeinitialization

 Packagecom.spring.cycle;Importorg.springframework.beans.BeansException;ImportOrg.springframework.beans.factory.config.BeanPostProcessor; Public classMybeanpostprocesserImplementsBeanpostprocessor { PublicObject Postprocessafterinitialization (Object arg0, String arg1)throwsbeansexception {System.out.println ("Postprocessafterinitialization" +arg1); returnarg0; }     PublicObject Postprocessbeforeinitialization (Object arg0, String arg1)throwsbeansexception {System.out.println ("Postprocessbeforeinitialization" +arg1); returnarg0; }}

Bean's life cycle

Car ' s constructor ... "Call constructor"
Setbrand ... "Setting properties"
Postprocessbeforeinitializationcar "Before instantiation method"
Init ... "instantiating beans"
Postprocessafterinitializationcar "After instantiation method"
Car [Brand=audi] "Call the ToString () method"
Destroy ... "Destroying beans"

Spring4.0 Study Notes (5)--Managing the bean's life cycle