Bean对象的所有后处理器，什么时候被加载的_bean后置处理器何时被加载-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_34116044/article/details/121505782

本文详细介绍了Spring框架在启动过程中BeanPostProcessor的初始化步骤。从prepareBeanFactory方法开始，到invokeBeanFactoryPostProcessors，再到registerBeanPostProcessors，逐步添加和注册各种类型的BeanPostProcessor。这一过程涉及ApplicationContextAwareProcessor、ApplicationListenerDetector、CommonAnnotationBeanPostProcessor、AutowiredAnnotationBeanPostProcessor等多个关键组件的处理，揭示了Spring容器内部如何准备和管理Bean的生命周期。

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第一步：

prepareBeanFactory()方法中添加一些spring默认的postprocessor

refresh方法中的prepareBeanFactory()执行的时候，加载的所有的BeanPostProcessor，在prepareBeanFactory方法执行完毕后，beanfactory里的后处理器是这样的：

0 = {ApplicationContextAwareProcessor@1522}
1 = {ApplicationListenerDetector@1935}

第二步：

invokeBeanFactoryPostProcessors()方法中，添加默认postprocessor：

0 = {ApplicationContextAwareProcessor@1522}
1 = {ApplicationListenerDetector@1888}
2 = {ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor@2352}

第三步：

/ Invoke factory processors registered as beans in the context.
//准备postprocessors，顾名思义，在创建bean
invokeBeanFactoryPostProcessors(beanFactory);

第四步：

registerBeanPostProcessors()，先注册一个默认的：

0 = {ApplicationContextAwareProcessor@1522}
1 = {ApplicationListenerDetector@1888}
2 = {ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor@2352}
3 = {PostProcessorRegistrationDelegate$BeanPostProcessorChecker@2527}

之后，分别添加postprocessors按如下顺序：

// First, register the BeanPostProcessors that implement PriorityOrdered.
priorityOrderedPostProcessors = {ArrayList@2314} size = 2
0 = {CommonAnnotationBeanPostProcessor@2323}
1 = {AutowiredAnnotationBeanPostProcessor@2324}
// Next, register the BeanPostProcessors that implement Ordered.
orderedPostProcessors = {ArrayList@2528} size = 1
0 = {AnnotationAwareAspectJAutoProxyCreator@2533}
// Now, register all regular BeanPostProcessors.
null size:0
// Finally, re-register all internal BeanPostProcessors.
0 = {AutowiredAnnotationBeanPostProcessor@2324}
1 = {CommonAnnotationBeanPostProcessor@2323}