Spring ApplicationContext

r囧r小猫 2024-03-25 13:51 77阅读 0赞

### 2. The ApplicationContext Interface ###

The interfaces [BeanFactory][] and [ApplicationContext][] `represent the Spring IoC container`

the Spring IoC container is responsible for `instantiating`, `configuring` and `assembling objects known as beans`, as well as `managing their life cycles`.

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#### BeanFactory 和 ApplicationContext 区别 ####

> 1、BeanFactory is the `root interface` for accessing the Spring container. It provides `basic functionalities` for managing beans.  
> 2、ApplicationContext is a `sub-interface of the BeanFactory`. Therefore, it offers `all the functionalities` of BeanFactory.`还添加`了对国际化、资源访问、事件传播等方面的支持。  
> 3、BeanFactory 的实现是使用`懒加载`的方式，这意味着 beans 只有在通过 getBean() 方法调用它们时才进行实例化。  
> 4、ApplicationContext的实现是使用`预加载`的方式，每一个 bean 都在 *`ApplicationContext`* 启动之后实例化。（Each bean is instantiated after the container has been started since it uses `eager loading`.）

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### 4. Configuring Beans for the Container ###

The primary job of the ApplicationContext is to `manage beans`.  
The Spring IoC container read and uses `configuration metadata` to `assemble beans` `at runtime`.  
Spring supports `different ways` of configuring beans.  
**[Java-Based Configuration Beans for Ioc Container][]**  
**[Annotation-Based Configuration Beans for Ioc Container][]**  
**[XML-Based Configuration Beans for Ioc Container][]**

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参考：  
[The Spring ApplicationContext][]

[BeanFactory]: https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/beans/factory/BeanFactory.html
[ApplicationContext]: https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context/ApplicationContext.html
[Java-Based Configuration Beans for Ioc Container]: https://blog.csdn.net/weixin_37646636/article/details/133383857
[Annotation-Based Configuration Beans for Ioc Container]: https://blog.csdn.net/weixin_37646636/article/details/133281705
[XML-Based Configuration Beans for Ioc Container]: https://blog.csdn.net/weixin_37646636/article/details/133384129
[The Spring ApplicationContext]: https://www.baeldung.com/spring-application-context