关于spring:spring里的BeanPostProcessor

图片起源：深刻分析 Spring(三)——Bean 的生命周期

这张图里一个表明了 bean 的生命周期，另外一个也阐明了 BeanPostProcessor 在设置了 bean 的属性后的前置解决与后置解决。
这个是 BeanPostProcessor 的定义：

/**
 * Factory hook that allows for custom modification of new bean instances &mdash;
 * for example, checking for marker interfaces or wrapping beans with proxies.
 *
 * <p>Typically, post-processors that populate beans via marker interfaces
 * or the like will implement {@link #postProcessBeforeInitialization},
 * while post-processors that wrap beans with proxies will normally
 * implement {@link #postProcessAfterInitialization}.
 *
 */
public interface BeanPostProcessor {
    
    @Nullable
    default Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {return bean;}

    @Nullable
    default Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {return bean;}

}

这个是 BeanPostProcessor 所有子类，当前再来剖析下。