spring--@configuration and @Bean

Reference: http://wiki.jikexueyuan.com/project/spring/java-based-configuration.html

@Configuration and @Bean annotations

Annotated classes with @Configuration indicate that the class can use the Spring IoC container as the source for the bean definition. @Bean Note tells Spring that an annotation method with @Bean will return an object that should be registered as a Bean in the context of the Spring application. The simplest possible @Configuration classes are as follows:

1  Packageorg.wzh.di.demo1.congiration;2 3 ImportOrg.springframework.context.annotation.Bean;4 Importorg.springframework.context.annotation.Configuration;5 6 @Configuration7  Public classHelloworldconfig {8 @Bean9      PublicHelloWorld HelloWorld () {Ten         return NewHelloWorld (); One     } A}

1  Packageorg.wzh.di.demo1.congiration;2 3  Public classHelloWorld {4 5     PrivateString message;6 7      PublicString getMessage () {8         returnmessage;9     }Ten  One      Public voidsetmessage (String message) { A          This. Message =message; -     } -  the}

1  Packageorg.wzh.di.demo1.congiration;2 3 ImportOrg.springframework.context.ApplicationContext;4 ImportOrg.springframework.context.annotation.AnnotationConfigApplicationContext;5 6  Public classTest {7 8      Public Static voidMain (string[] args) {9ApplicationContext CTX =NewAnnotationconfigapplicationcontext (Helloworldconfig.class);TenHelloWorld HelloWorld = Ctx.getbean (HelloWorld.class); OneHelloworld.setmessage ("Hello world!"); AString msg =helloworld.getmessage (); - System.out.println (msg); -     } the  -}

You can also load other configuration classes, where only write usage

1  Packageorg.wzh.di.demo1.congiration;2 3 ImportOrg.springframework.context.annotation.AnnotationConfigApplicationContext;4 5  Public classTest2 {6 7      Public Static voidMain (string[] args) {8Annotationconfigapplicationcontext CTX =NewAnnotationconfigapplicationcontext ();9Ctx.register (Helloworldconfig.class);Ten Ctx.refresh (); OneHelloWorld HelloWorld = Ctx.getbean (HelloWorld.class); AHelloworld.setmessage ("Hello World 2!")); -String msg =helloworld.getmessage (); - System.out.println (msg); the     } -  -}

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