Aop有的人说拦截不到Controller。有的人说想拦截到Controller必须得拦截org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter。。。今天，我们就来细细分析一下。
首先Aop可以拦截到Controller的，这个是毋容置疑的；其次须拦截AnnotationMethodHandlerAdapter也不是必须的。造成aop无法拦截controller，主要是因为声明aop的配置写到了applicationContext.xml中。看了一下国外的帖子：（http://stackoverflow.com/questions/17834958/spring-aop-is-not-working-in-with-mvc-structure?rq=1）
<context:component-scan base-package="com.dao" />
<mvc:annotation-driven/>
<aop:aspectj-autoproxy />
from application-context.xml to controller-servlet.xml?
The aspects and the beans to be applied needs to be in the same ApplicationContext but ApplicationContext is not aware of WebApplicationContext .
Indeed your controller (annotated by @Controller) and your aspects (annotated by @Aspect) should be in the same Spring context.
Usually people define their controllers in the dispatch-servlet.xml or xxx-servlet.xml and their service beans (including the aspects) in the main applicationContext.xml. It will not work.
When Spring initializes the MVC context, it will create a proxy for your controller but if your aspects are not in the same context, Spring will not create interceptors for them.
大概是说，applicationContext.xml和servlet.xml都有各自的上下文（看论坛上的说法貌似是这样的）。所以在Controller上AOP，需要把AOP配置写在servlet.xml里，也就是定义到spring-mvc.xml里。
