AspectJAutoProxyCreator完成BeanFactory初始化工作
finishBeanFactoryInitialization(beanFactory);完成BeanFactory初始化工作；创建剩下的单实例bean
refresh()->finishBeanFactoryInitialization()->preInstantiateSingletons()->getBean()->doGetBean->getSingleton->createBean()->doCreateBean()->createBeanInstance()->populateBean()->initializeBean()->applyBeanPostProcessorsBeforeInitialization()->invokeInitMethods()->applyBeanPostProcessorsAfterInitialization()
SmartInstantiationAwareBeanPostProcessor
org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation(Class<?>, String)
org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor.postProcessAfterInstantiation(Object, String)
BeanPostProcessor
org.springframework.beans.factory.config.BeanPostProcessor.postProcessBeforeInitialization(Object, String)
org.springframework.beans.factory.config.BeanPostProcessor.postProcessAfterInitialization(Object, String)
完成BeanFactory初始化工作；创建剩下的单实例bean
finishBeanFactoryInitialization(beanFactory);
遍历获取容器中所有的Bean，依次创建对象getBean(beanName);\
先从缓存中获取当前bean，如果能获取到，说明bean是之前被创建过的，直接使用，否则再创建
希望后置处理器在此能返回一个代理对象；如果能返回代理对象就使用，如果不能就继续
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(String, RootBeanDefinition)
后置处理器先尝试返回对象
【BeanPostProcessor是在Bean对象创建完成初始化前后调用的】
【InstantiationAwareBeanPostProcessor是在创建Bean实例之前先尝试用后置处理器返回对象的】