Spring Initializingbean Interface

First, the interface

 Public InterfaceInitializingbean {/*** Invoked by a beanfactory after it have set all beans properties supplied * (and satisfied beanfactoryaware an     D applicationcontextaware). * <p>this method allows the bean instance to perform initialization if * possible when all bean properties hav     e been set and to throw a * exception in the event of misconfiguration. * @throwsException in the event of misconfiguration (such * as failure to set a essential property) or if initialization     Fails. */    voidAfterpropertiesset ()throwsException;}

Second, the role

Use spring's Initializingbean Afterpropertiesset to initialize and look directly at the demo below

①, interface definition

 Public Interface Initializingservice {    publicvoid  Say ();}

②, interface implementation class

@Component ("Initializingservice")publicclassimplements  Initializingservice, Initializingbean {    @Override    publicvoidthrows  Exception {                System.out.println ("Call Initializingbean");    }    @Override    publicvoid  say () {                System.out.println ("call say") ;    }}

③, get bean context tool class implementation

 Public classSpringcontextutilImplementsApplicationcontextaware {Private StaticApplicationContext ApplicationContext;//Spring Application Context Environment@Override Public voidSetapplicationcontext (ApplicationContext ApplicationContext)throwsbeansexception {springcontextutil.applicationcontext=ApplicationContext; }    /*** Get the object * *@paramname *@returnObject An instance of the bean registered with the given name *@throwsbeansexception*/     Public StaticObject Getbean (String name)throwsbeansexception {returnApplicationcontext.getbean (name); }}

XML configuration: Spring XML file injection

<id= "Springcontextutil"  class= " Com.mycompany.yuanmeng.springdemo.aop.SpringContextUtil "/>

④, testing

 Public class Initializingbeandemo {    publicstaticvoid  main (string[] args) {         New//  load ApplicationContext (analog start Web service)        = (initializingservice ) Springcontextutil.getbean ("Initializingservice");                Service.say ();    }}

⑤, results

Call Initializingbeancall say

This means that when spring initializes the bean, the Afterpropertiesset method is called automatically if the Bean implements the Initializingbean interface.

Spring Initializingbean Interface