Use XML configuration bean for spring IOC container

1. Project

2. Create an XML file

3. Printer interface

 Package com.example.demo.computerTest;  Public Interface Printer {    void  init ();     void print (String txt);}

4. Color Printer

 Package com.example.demo.computerTest;  Public class Implements Printer {    @Override    publicvoid  init () {        System.out.println (" Start the color printer! ");    }    @Override    publicvoid  print (String txt) {        System.out.println (" Print color text: ". Concat (TXT));}    }

5. Computer class

 Packagecom.example.demo.computerTest; Public classcomputer {String manu;    String type;    Printer p;  PublicString Getmanu () {returnManu; }     Public voidSetmanu (String Manu) { This. Manu =Manu; }     PublicString GetType () {returntype; }     Public voidsetType (String type) { This. Type =type; }
The Printtxt () method receives a parameter to the print () method of the printer to implement the printing function Public voidprinttxt (String txt) {p.init ();    P.print (TXT); }     PublicPrinter Getp () {returnp; }     Public voidSetp (Printer p) { This. P =p; }}

6. Test class

Description

Loading an XML file with Classpathxmlapplicationcontext

Get the specific bean by passing in the parameter to the Context.getbean () method, which is the ID name in the XML file;

The method in the computer class can be called by instance object p to get the value set for the Computer class property in the configuration file.

 Packagecom.example.demo.computerTest;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext; Public classComputertest { Public Static voidMain (string[] args) {Classpathxmlapplicationcontext context=NewClasspathxmlapplicationcontext ("Computers.xml"); Computer P= (computer) context.getbean ("PC"); P.printtxt ("Hello,spring!");        System.out.println (P.getmanu ());    System.out.println (P.gettype ()); }}

7. XML configuration

Description

Set the ID for each bean through the id attribute;

Setting the bean's location through the class property

You can reference a bean that has already been defined by using the ref attribute

property allows you to manipulate attributes in the bean:

The Name property specifies a property in the bean

Value sets the specified values for this property

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">       <BeanID= "Colorprinter"class= "Com.example.demo.computerTest.ColorPrinter"/>       <BeanID= "PC"class= "Com.example.demo.computerTest.Computer">           < Propertyname= "Manu">               <value>Apple</value>           </ Property>           < Propertyname= "type"value= "IPad"/>           < Propertyname= "P"ref= "Colorprinter"/>       </Bean></Beans>

8. Effect:

1, the test class can also be the following code

 Packagecom.example.demo.computerTest;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext; Public classComputertest { Public Static voidMain (string[] args) {//Classpathxmlapplicationcontext context = new Classpathxmlapplicationcontext ("Computers.xml"); //computer p = (computer) context.getbean ("PC"); //p.printtxt ("hello,spring!"); //System.out.println (P.getmanu ()); //System.out.println (P.gettype ());ApplicationContext Context=NewClasspathxmlapplicationcontext ("Computers.xml"); Computer P= (computer) context.getbean ("PC"); P.printtxt ("Hello,spring!"); }}

2. Effect:

Use XML configuration bean for spring IOC container