本文详细介绍了Spring框架中的两种核心容器：BeanFactory与ApplicationContext。BeanFactory作为基本的工厂接口，负责实例化和装配Bean；而ApplicationContext则在此基础上提供了更丰富的应用级服务，如资源访问、消息服务等，并且它会预先加载所有singleton作用域的Bean。
Spring provides container implementations with two types :
Bean factories(defined by the org.springframework.beans.factory.BeanFactory interface)
are the simplest of containers, providing basic support for DI.
Application contexts(defined by the org.springframework.context.ApplicationContext interface)
build on the notion of a bean factory by providing application framework services.
BeanFactory
- A bean factory is a general-purpose factory, creating and dispensing many types of beans
- It is able to create associations between collaborating objects as they are instantiated
- A bean factory also takes part in the lifecycle of a bean
- While the bean factory will immediately load the bean definitions, the beans themselves will not be
instantiated until they are needed (lazy loading)
ApplicationContext
- advanced container ApplicationContext is much the same as a BeanFactory, but offers much more
- Because of the additional functionality it provides, an ApplicationContext is preferred over a
BeanFactory in nearly all applications - An application context preloads all singleton beans upon context startup (different from bean factory)
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