BeanFactory or ApplicationContext?

sunyimaying1

于 2009-10-22 14:56:00 发布

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文章标签： bean associations application containers interface types

本文链接：https://blog.youkuaiyun.com/sunyimaying1/article/details/4713385

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。

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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)