BeanFactoryPostProcessor
BeanPostProcessor


public interface BeanFactoryPostProcessor {
void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException;
 

Modify the application context's internal bean factory after its standard initialization. 
All bean definitions will have been loaded, but no beans will have been instantiated yet. 
This allows for overriding or adding properties even to eager-initializing beans.
     
在bean创建之前，修改bean的定义
把bean的scope从singleton改为prototype
修改property的值

BeanDefinition bd = beanFactory.getBeanDefinition("xxxbean");
MutablePropertyValues pv =  bd.getPropertyValues();  
if (pv.contains("xxx")) {  
    pv.addPropertyValue("xxx", "abc");  
} 
bd.setScope(BeanDefinition.SCOPE_PROTOTYPE);
        

内置的一些BeanFactoryPostProcessor实现类 
org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
org.springframework.beans.factory.config.PropertyOverrideConfigurer
org.springframework.beans.factory.config.CustomEditorConfigurer       注册自定义的属性编辑器



BeanPostProcessor

public interface BeanPostProcessor {
    // before  InitializingBean's afterPropertiesSet or custom init-method
    Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException;
 
    // after  InitializingBean's afterPropertiesSet or custom init-method
    Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException;
}


实例化bean之后，初始化方法前后执行

InitializingBean接口 afterPropertiesSet
init-method 方法

一些内置的BeanPostProcessor实现类 

org.springframework.context.annotation.CommonAnnotationBeanPostProcessor           
org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor    
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor   
org.springframework.context.support.ApplicationContextAwareProcessor 

CommonAnnotationBeanPostProcessor  处理 @Resource 



 spring bean 生命周期实例 
 spring bean生命周期及扩展点