Spring Aop基本流程原理示例详解

protectedObjectinitializeBean(StringbeanName,Objectbean,@NullableRootBeanDefinitionmbd){
    if(System.getSecurityManager()!=null){
        AccessController.doPrivileged((PrivilegedAction<Object>)()->{
            invokeAwareMethods(beanName,bean);
            return null;
        },getAccessControlContext());
    }
    else{
        invokeAwareMethods(beanName,bean);
    }
 
    ObjectwrappedBean=bean;
    if(mbd==null||!mbd.isSynthetic()){
        // 执⾏所有的BeanPostProcessor#postProcessBeforeInitialization 初始化之前
的处理器⽅法
        wrappedBean=applyBeanPostProcessorsBeforeInitialization(wrappedBean,beanName);
    }
 
    try{
        // 这⾥就开始执⾏afterPropertiesSet（实现了InitializingBean接⼝）⽅法和
        initMethod
        invokeInitMethods(beanName,wrappedBean,mbd);
    }
    catch(Throwableex){
        thrownewBeanCreationException((mbd!=null?            mbd.getResourceDescription():null),beanName,"Invocationofinitmethodfailed",ex);
    }
    if(mbd==null||!mbd.isSynthetic()){
        // 整个Bean初始化完成，执⾏后置处理器⽅法
        wrappedBean=applyBeanPostProcessorsAfterInitialization(wrappedBean,beanName);
    }
 
    return wrappedBean;
}

可以看到有初始化前执行的方法、初始化时执行的方法、初始化之后执行的方法，我们从初始化之后执行的方法入手。

二、applyBeanPostProcessorsAfterInitialization

applyBeanPostProcessorsAfterInitialization（）方法的流程如下:

AbstractAutowireCapableBeanFactory#applyBeanPostProcessorsAfterInitialization
->AbstractAutoProxyCreator#postProcessAfterInitialization

->AbstractAutoProxyCreator#wrapIfNecessary

->AbstractAutoProxyCreator#createProxy

->proxyFactory.getProxy()