【Spring】对象后期处理，BeanPostProcessor

当我们使用Spring容器管理对象时，需要对对象进行一些后期处理时，比如数据处理、数据预加载，可以使用BeanPostProcessor接口。

简单演示它的用法。

定义扫描包，显示定义BeanPostProcessor的实现类：

七月 11, 2016 10:31:13 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@427a39ea: startup date [Mon Jul 11 22:31:13 CST 2016]; root of context hierarchy
七月 11, 2016 10:31:13 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [spring.xml]
七月 11, 2016 10:31:13 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@6371be16: defining beans [userService,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,myBeanPostProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
postProcessBeforeInitialization : com.nicchagil.springapplication.No004BeanPostProcessor.UserService
some operation in this point.
postProcessAfterInitialization : com.nicchagil.springapplication.No004BeanPostProcessor.UserService
some operation in this point.
query user method.

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