Spring:@Component 与 @Bean [英] Spring: @Component versus @Bean

问题描述

我知道 @Component 注释是在 spring 2.5 中引入的，目的是通过使用类路径扫描来摆脱 xml bean 定义.

I understand that @Component annotation was introduced in spring 2.5 in order to get rid of xml bean definition by using classpath scanning.

@Bean 是在 spring 3.0 中引入的，可以与 @Configuration 一起使用，以完全摆脱 xml 文件并使用 java 配置代替.

@Bean was introduced in spring 3.0 and can be used with @Configuration in order to fully get rid of xml file and use java config instead.

是否可以重用 @Component 批注而不是引入 @Bean 批注?我的理解是，最终目标是在两种情况下都创建 bean.

Would it have been possible to re-use the @Component annotation instead of introducing @Bean annotation? My understanding is that the final goal is to create beans in both cases.

推荐答案

@Component首选元件扫描和自动布线.

@Component Preferable for component scanning and automatic wiring.

什么时候应该使用 @Bean?

有时自动配置不是一种选择.什么时候? 假设你想从 3rd-party 库中连接组件(你没有源代码，所以你不能用 @Component 注释它的类)，所以自动配置是不可能的.

Sometimes automatic configuration is not an option. When? Let's imagine that you want to wire components from 3rd-party libraries (you don't have the source code so you can't annotate its classes with @Component), so automatic configuration is not possible.

@Bean 注释返回一个对象，spring 应该在应用程序上下文中将其注册为 bean.方法体承载着负责创建实例的逻辑.

The @Bean annotation returns an object that spring should register as bean in application context. The body of the method bears the logic responsible for creating the instance.

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