Spring annotation Method Injects bean

adding annotations to the Bean,spring configuration file also adds some constraints and the package in which the annotation is imported

Applicationcontext.xml

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:context= "Http://www.springframework.org/schema/context"5 xsi:schemalocation= "Http://www.springframework.org/schema/beans6 http://www.springframework.org/schema/beans/spring-beans.xsd7 Http://www.springframework.org/schema/context8 http://www.springframework.org/schema/context/spring-context.xsd ">9 Ten     <Context:component-scanBase-package= "Com.xiaostudy.service"></Context:component-scan> One     <Context:component-scanBase-package= "Com.xiaostudy.dao"></Context:component-scan> A </Beans>

Bean class Personimple.java injected with annotations

1  PackageCom.xiaostudy.service;2 3 Importjavax.annotation.PostConstruct;4 ImportJavax.annotation.PreDestroy;5 ImportJavax.annotation.Resource;6 7 ImportOrg.springframework.beans.factory.annotation.Value;8 ImportOrg.springframework.context.annotation.Scope;9 Importorg.springframework.stereotype.Component;Ten /* One * Bean Injection A * 1, @Component ("id") - * 2, WEB: - * @Controller ("id") Web the * @Service ("id") Service - * @Repository ("id") DAO -  */ -@Component ("Person") + /* - * Bean Scope + * @Scope ("singleton") single case (also default) A * @Scope ("prototype") is a new object once each new at  */ -@Scope ("Prototype") -  Public classPersonimpleImplementsPerson { -     /* - * Bean parameter injection - * 1, common parameters (i.e. those basic data types) in * @Value ("value") above the parameter or in the corresponding set method - * 2, reference parameters to * 2.1 Injected by type: @Autowired + * 2.2 Injected by name: @Autowired @Qualifier ("id") - * 2.3 Injected by name: @Resource the      *  *      */ $     //@ResourcePanax Notoginseng     Privatedao_demoimple Dao_demo; -@Value ("Xiaostudy") the     PrivateString name; +      A  the      PublicString GetName () { +         returnname; -     } $  $      Public voidsetName (String name) { -          This. Name =name; -     } the  -      Publicdao_demoimple Getdao_demo () {Wuyi         returnDao_demo; the     } -  Wu @Resource -      Public voidSetdao_demo (dao_demoimple dao_demo) { About          This. Dao_demo =Dao_demo; $     } -     /* - * Bean initialization method Annotations - * @PostConstruct A      */ + @PostConstruct the      Public voidinit () { -System.out.println ("Init () >>>>>>"); $     } the      the     /* the * Bean Destruction Annotations the * @PreDestroy -      */ in @PreDestroy the      Public voiddestroy () { theSystem.out.println ("Destroy () >>>>>"); About     } the      the}

Person interface

1  Package Com.xiaostudy.service; 2 3  Public Interface Person {45 }

Dao_demo interface

1  Package Com.xiaostudy.dao; 2 3  Public Interface Dao_demo {45 }

Dao_demoimple.java

1  PackageCom.xiaostudy.service;2 3 ImportOrg.springframework.beans.factory.annotation.Value;4 Importorg.springframework.stereotype.Component;5 6 ImportCom.xiaostudy.dao.Dao_demo;7@Component ("Dao_demo")8  Public classDao_demoimpleImplementsDao_demo {9     Ten     PrivateString name; One      A      PublicString GetName () { -         returnname; -     } the  -@Value ("Demo") -      Public voidsetName (String name) { -          This. Name =name; +     } -  +      Public voidAdd () { ASystem.out.println ("add>>>>>>"); at     } -      -}

Test class Test.java

1  PackageCom.xiaostudy.service;2 3 ImportOrg.springframework.context.ApplicationContext;4 ImportOrg.springframework.context.support.AbstractApplicationContext;5 ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;6 7 ImportCom.xiaostudy.dao.Dao_demo;8 ImportCom.xiaostudy.service.Person;9 Ten  Public classTest { One  A      Public Static voidMain (string[] args) { -ApplicationContext AC =NewClasspathxmlapplicationcontext ("Applicationcontext.xml"); -Person person = ac.getbean (' person ', person.class); the System.out.println (person); -Personimple pi =(personimple) person; - System.out.println (Pi.getname ()); -Dao_demoimple Dao_demo =Pi.getdao_demo (); + System.out.println (Dao_demo); - Dao_demo.add (); + System.out.println (Dao_demo.getname ()); A         /*Person Person1 = Ac.getbean ("person", person.class); at Person Person2 = Ac.getbean ("person", person.class); - System.out.println (person1); - System.out.println (person2); - ( (Abstractapplicationcontext) AC). Close ();*/ -     } -  in}

Spring annotation Method Injects bean