Spring (2): Spring Ioc

1. Download spring-framework-3.2.0

Full package Download Path:

Https://repo.spring.io/webapp/#/artifacts/browse/tree/Properties/libs-release-local/org/springframework/spring /3.2.0.release

Or, this sample only needs four packages, download the path:

Https://files.cnblogs.com/files/xueyuangudiao/Spring_IoC.zip

2. Download Commons Logging

Rely on commons Logging, so download required.

Download path:

http://commons.apache.org/proper/commons-logging/download_logging.cgi

Or: Https://files.cnblogs.com/files/xueyuangudiao/commons-logging-1.2-bin.zip

3. Create a generic Java project

4. Import the downloaded jar into the project

5. Write a model that is later instantiated by a dependency injection method.

1  Public classUser {2     3     PrivateString UserName;4     Private intAge ;5     6      PublicString GetUserName () {7         returnUserName;8     }9      Public voidsetusername (String userName) {Ten          This. UserName =UserName; One     } A      Public intGetage () { -         returnAge ; -     } the      Public voidSetage (intAge ) { -          This. Age =Age ; -     } -      + @Override -      PublicString toString () { +         return"User [username=" + UserName + ", age=" + Age + "]"; A     } at}

6. Create an XML file (Springtest.xml), and spring will read the contents of the XML file to clarify the correspondence between the type and injected content

1 <?XML version= "1.0" encoding= "UTF-8"?>2 <Beansxmlns= "Http://www.springframework.org/schema/beans"3 Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"4 xmlns:p= "http://www.springframework.org/schema/p"5 xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd" >6     7     <!--ID: Used as the code name of the Bean; class: -8     <BeanID= "User"class= "Com.test.model.User">9         <!--A property name in the user class that, when instantiated by spring, assigns value to the Username property -Ten         < Propertyname= "UserName"value= "John Doe"></ Property> One         < Propertyname= "Age"value= "+"></ Property> A     </Bean> -      - </Beans>

7. Create the Hellospring class, where the main function demonstrates the contrast between the method of dependency injection and the normal object instantiation method

1  Packagecom.test;2 3 Importorg.springframework.beans.factory.BeanFactory;4 ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;5 6 ImportCom.test.model.User;7 8  Public classhellospring {9 Ten      Public Static voidMain (string[] args) { One  A         //Spring notation -Beanfactory BF =NewClasspathxmlapplicationcontext ("Springtest.xml"); -User User2 = (user) Bf.getbean ("User"); the System.out.println (user2); -          -         //General Wording -User user1 =NewUser (); +User1.setusername ("Zhang San"); -User1.setage (20); + System.out.println (user1); A  at     } -}

Execution Result:

User [username= John Doe, age=21]
User [Username= Zhang San, age=20]

8. Entire code structure

9. Complete code

Https://files.cnblogs.com/files/xueyuangudiao/SpringTest2.zip

Spring (2): Spring Ioc