org.springframework.beans.factory.config

接口 BeanPostProcessor

所有已知子接口:

DestructionAwareBeanPostProcessor, InstantiationAwareBeanPostProcessor, MergedBeanDefinitionPostProcessor, SmartInstantiationAwareBeanPostProcessor

所有已知实现类:

AutowiredAnnotationBeanPostProcessor, InitDestroyAnnotationBeanPostProcessor, InstantiationAwareBeanPostProcessorAdapter, RequiredAnnotationBeanPostProcessor

public interface BeanPostProcessor

后置处理器接口,系统默认的有7个名称分别为: 1:ApplicationContextAwareProcessor 直接实现了 BeanPostProcessor 用来直接处理我们的组件是否实现了ApplicationContextAware接口的作用,往我们容器中注册回调ApplicationContext接口 起作用的接口:postProcessBeforeInitialization()方法来进行回调我们的aware接口的 执行时间：我们的Bean进行了调用了构造方法之后，初始化之前 2:CommonAnnotationBeanPostProcessor extends InitDestroyAnnotationBeanPostProcessor 用于处理@PostCust @Predestory注解的 implements InstantiationAwareBeanPostProcessor 实例化执行 :用来处理JSR250规范的注解的。。。。。。。。。 3:AutowiredAnnotationBeanPostProcessor extends：InstantiationAwareBeanPostProcessorAdapter implement： MergedBeanDefinitionPostProcessor 用来解析bean之间的@AutoWired注解 4：RequiredAnnotationBeanPostProcessor 处理reqireud属性的 extends：InstantiationAwareBeanPostProcessorAdapter implement： MergedBeanDefinitionPostProcessor 用来解析bean之间的@AutoWired注解

方法概要

限定符和类型	方法和说明
default Object	postProcessAfterInitialization(Object bean, String beanName) Apply this BeanPostProcessor to the given new bean instance after any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method).
default Object	postProcessBeforeInitialization(Object bean, String beanName) Apply this BeanPostProcessor to the given new bean instance before any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method).

方法详细资料

postProcessBeforeInitialization

@Nullable
default Object postProcessBeforeInitialization(Object bean,
                                                          String beanName)
                                                   throws BeansException

Apply this BeanPostProcessor to the given new bean instance before any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.

The default implementation returns the given bean as-is.

参数:

bean - the new bean instance

beanName - the name of the bean

返回:

the bean instance to use, either the original or a wrapped one; if null, no subsequent BeanPostProcessors will be invoked

抛出:

BeansException - in case of errors

另请参阅:

InitializingBean.afterPropertiesSet()

postProcessAfterInitialization

@Nullable
default Object postProcessAfterInitialization(Object bean,
                                                         String beanName)
                                                  throws BeansException

Apply this BeanPostProcessor to the given new bean instance after any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.

In case of a FactoryBean, this callback will be invoked for both the FactoryBean instance and the objects created by the FactoryBean (as of Spring 2.0). The post-processor can decide whether to apply to either the FactoryBean or created objects or both through corresponding bean instanceof FactoryBean checks.

This callback will also be invoked after a short-circuiting triggered by a InstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation(java.lang.Class<?>, java.lang.String) method, in contrast to all other BeanPostProcessor callbacks.

The default implementation returns the given bean as-is.

参数:

bean - the new bean instance

beanName - the name of the bean

返回:

the bean instance to use, either the original or a wrapped one; if null, no subsequent BeanPostProcessors will be invoked

抛出:

BeansException - in case of errors

另请参阅:

InitializingBean.afterPropertiesSet(), FactoryBean