Spring后置处理器BeanPostProcessor

1. 概述
   BeanPostProcessor[interface]是spring的后置处理器,在bean初始化前后进行一些初始化工作。
   复制代码postProcessBeforeInitialization在初始化之前工作 postProcessAfterInitialization在初始化之后工作

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   postProcessBeforeInitialization在初始化之前工作
   postProcessAfterInitialization在初始化之后工作

2. Spring底层对BeanPostProcessor的使用
   ApplicationContextAwareProcessor中使用
   
   在spring类中需要使用到spring的上下文（ApplicationContext），只需要实现ApplicationContextAware，后置处理器会自动赋值
   复制代码public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { if (!(bean instanceof EnvironmentAware || bean instanceof EmbeddedValueResolverAware || bean instanceof ResourceLoaderAware || bean instanceof ApplicationEventPublisherAware || bean instanceof MessageSourceAware || bean instanceof ApplicationContextAware)){ return bean; } AccessControlContext acc = null; if (System.getSecurityManager() != null) { acc = this.applicationContext.getBeanFactory().getAccessControlContext(); } if (acc != null) { AccessController.doPrivileged((PrivilegedAction<Object>) () -> { invokeAwareInterfaces(bean); return null; }, acc); } else { invokeAwareInterfaces(bean); } return bean; }

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   public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
   if (!(bean instanceof EnvironmentAware || bean instanceof EmbeddedValueResolverAware ||
   bean instanceof ResourceLoaderAware || bean instanceof ApplicationEventPublisherAware ||
   bean instanceof MessageSourceAware || bean instanceof ApplicationContextAware)){
   return bean;
   }
   AccessControlContext acc = null;
   if (System.getSecurityManager() != null) {
   acc = this.applicationContext.getBeanFactory().getAccessControlContext();
   }
   if (acc != null) {
   AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
   invokeAwareInterfaces(bean);
   return null;
   }, acc);
   }
   else {
   invokeAwareInterfaces(bean);
   }
   return bean;
   }

    
   复制代码AutowiredAnnotationBeanPostProcessor自动装配中使用

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   AutowiredAnnotationBeanPostProcessor自动装配中使用

   复制代码 

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