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Spring aware接口及FactoryBean

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spring备忘录:
spring提供了很多*aware接口,比较常用的就是BeanFactoryAware,ApplicationContextAware,BeanNameAware
实现这些接口的Bean则能获得相应的BeanFactory,ApplicationContext实例,从而能直接获得容器信息。

FactoryBean接口作用就是封装自己定制的实例化逻辑(例如你想用工厂模式来实例化,或者Class.getInstance()),然后让spring统一管理。

BeanPostProcessor,BeanFactoryPostProcessor接口都是容器扩展点,容许spring在bean初始化或者销毁的时候回调,回调顺序可以用order来指定,前提是必须执行Ordered接口。
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