Spring 钩子之BeanFactoryPostProcessor和BeanPostProcessor的源码学习,FactoryBean

BeanFactoryPostProcessor 是用于增强BeanFactory的（例如可以增强beanDefination), BeanPostProcessor是用于增强bean的，而FactoryBean是一个bean，一般用于创建复杂的bean

refer:

https://www.jianshu.com/p/a90a3e617ba6

https://www.cnblogs.com/sishang/p/6588542.html