Control inversion and dependency injection of Spring framework

Learn the spring framework must understand control inversion and dependency injection. Here is an example to illustrate.

IOC (Inversion of Control): The application itself creates and maintains dependent objects, which are now created and maintained by external containers (Spring); the transfer of control;
is called control reversal.

First step: Configure Applicationcontextcreateproject.xml and Applicationcontext.xml (overall)

<?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-2.5.xsd ">             <BeanID= "Create"class= "Createobject.createhelloworld"Factory-method= "Create">               </Bean>  </Beans>

<?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-2.5.xsd "><!--referencing other configuration files -    <ImportResource= "Createobject/applicationcontextcreateproject.xml"/></Beans>

 Package CreateObject;  Public class Createhelloworld {    // static factory public    static  Helloword Create () {                returnnew  Helloword ();    }}

 Package CreateObject;  Public class Helloword {    publicvoid  hellow () {        System.out.print ("Hellow Spring" );    }}

Test class:

 PackageCreateObject;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext; Public classtexthell{ Public Static voidMain (string[] args) {//TODO auto-generated Method Stub//Load configuration fileApplicationContext context=NewClasspathxmlapplicationcontext ("Applicationcontext.xml"); Helloword te= (Helloword) context.getbean ("Create");       Te.hellow (); }}

：

DI (Dependency Injection): (An implementation of control inversion) during a program's operation; dynamically injecting dependent objects into the component (creating objects) the work of new is given to spring; pre-reserved interface; set Get method

First Step: Configure Springapplicationcontext.xml

<?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-2.5.xsd "><BeanID= "Wanlix"class= "com. Test.test ">< Propertyname= "Name"value= "Zhangga"/>< Propertyname= "Speak"value= "If you don't hit the weasel one day,"/></Bean></Beans>

Step Two: Test the class

 Packagecom. Test;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext; Public classTest { PublicString name;  PublicString speak;  PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     PublicString Getspeak () {returnspeak; }     Public voidSetspeak (String speak) { This. Speak =speak; }     Public Static voidMain (string[] args) {ApplicationContext context=NewClasspathxmlapplicationcontext ("Applicationcontext.xml"); Test Te= (test) Context.getbean ("Wanlix"); System.out.print (Te.getname ()+ "SAY:" +te.getspeak ()); }}

：

Control inversion and dependency injection of Spring framework