Question

@Bean在@Configuration和在@Component中的区别

Answer 1

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关于@Bean在@Configuration和在@Component中的区别（源于spring官方文档，仅供参考与本站立场无关）：
The @Bean methods in a Spring component are processed differently than their counterparts inside a Spring @Configuration class. The difference is that @Component classes are not enhanced with CGLIB to intercept the invocation of methods and fields. CGLIB proxying is the means by which invoking methods or fields within @Bean methods in @Configuration classes creates bean metadata references to collaborating objects; such methods are not invoked with normal Java semantics but rather Go through the Container in order to provide the usual lifecycle management and proxying of Spring beans even when referring to other beans via programmatic calls to @Bean methods. In contrast, invoking a method or field in an @Bean method within a plain @Component class has standard java semantics, with no special CGLIB processing or other constraints applying.
翻译：
在Component中(@Component标注的类，包括@Service,@Repository, @Controller)使用@Bean注解和在@Configuration中使用是不同的。在@Component类中使用方法或字段时不会使用CGLIB增强(及不使用代理类：调用任何方法，使用任何变量，拿到的是原始对象，后面会有例子解释)。而在@Configuration类中使用方法或字段时则使用CGLIB创造协作对象（及使用代理：拿到的是代理对象）;当调用@Bean注解的方法时它不是普通的Java语义，而是从容器中拿到由Spring生命周期管理、被Spring代理甚至依赖于其他Bean的对象引用。在@Component中调用@Bean注解的方法和字段则是普通的Java语义，不经过CGLIB处理。
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