spring 的一些注解

孙大大

于 2011-04-13 16:42:00 发布

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分类专栏： spring 文章标签： spring autowired bean comments class

本文链接：https://blog.youkuaiyun.com/suncaishen/article/details/6320993

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本文探讨了JSR-330标准注解与Spring框架中的依赖注入注解之间的区别与联系。重点讲解了如何在Spring环境中使用JSR-330的@Inject和@Named注解，并指出了它们与Spring特有注解如@Autowired、@Component、@Scope等的不同之处。

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Spring	javax.inject.*	javax.inject restrictions / comments
@Autowired	@Inject	@Inject has no 'required' attribute
@Component	@Named
@Scope("singleton")	@Singleton	jsr-330 default scope is like Spring's `prototype`. However, in order to keep it consistent with Spring's general defaults, a jsr-330 bean declared in the Spring container is a `singleton` by default. In order to use another scope than `singleton`, you should use Spring's `@Scope` annotation. `javax.inject` also provides a @Scope annotation. Nevertheless, this one only aims to be used for creating your own annotations.
@Qualifier	@Named
@Value	-	no equivalent
@Required	-	no equivalent
@Lazy	-	no equivalent

使用@Named和@Inject的时候需要

配置文件中加上要扫描的包

 <beans>
    	<context:component-scan base-package="org.example"/>
 </beans>

@Configuration
public class AppConfig {
  @Bean
  public MyService myService() {
      return new MyServiceImpl();
  }
}

等同于

<beans>
  <bean id="myService" class="com.acme.services.MyServiceImpl"/>
</beans>

spring 的一些 注解