Spring 3中@Component和@Configuration之间的区别 [英] difference between @Component and @Configuration in Spring 3

问题描述

我遇到了Spring 3提供的两个注释（ @ Component 和 @Configuration ）
我在这些之间有点困惑。

这是我读到的@Component

I came across two annotations provided by Spring 3 (@Component and @Configuration) I am a bit confused between these.
Here is what I read about @Component

将此context：component放在bean配置文件中，这意味着，
在Spring中启用自动扫描功能。 base-package表示
你的组件存储在哪里，Spring将扫描这个文件夹，
找出bean（用@Component注释）并在
Spring容器中注册。

Put this "context:component" in bean configuration file, it means, enable auto scanning feature in Spring. The base-package is indicate where are your components stored, Spring will scan this folder and find out the bean (annotated with @Component) and register it in Spring container.

所以我想知道@Configuration的用途是什么，如果@Controller将注册我的bean而不需要在spring配置xml文件中声明它们

So I am wondering what is the use of @Configuration then if @Controller will register my beans without the need to declare them in spring configuration xml file

推荐答案

@Configuration 是基于Java的配置机制的核心它是在Spring 3中引入的。它提供了基于XML的配置的替代方案。

@Configuration is the heart of the Java-based configuration mechanism that was introduced in Spring 3. It provides an alternative to XML-based configuration.

因此以下2个片段是相同的：

So the 2 following snippets are identical:

<beans ...>
    <context:component-scan base-package="my.base.package"/>
    ... other configuration ...
</beans>

和：

@Configuration
@ComponentScan(basePackages = "my.base.package")
public class RootConfig {
    ... other configuration ...
}

在这两种情况下，Spring都将扫描 my.base.package @Component 注释的类的$ c>和更低版本，或使用 @Component 例如 @Service 。

In both cases Spring will scan in my.base.package and below for classes annotated with @Component or one of the other annotations that are meta-annotated with @Component such as @Service.

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