springmvc-interceptor

Interceptor的接口定义如下：

public interface HandlerInterceptor {

 

boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)

throws Exception;

 

void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndViewmodelAndView) throws Exception;

 

void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception;

}

具体的我就不展开分析啦，我们只要记住interceptor的三个hook point（在AOP里叫join point，哈哈）：Controller执行前，Controller执行后，页面显示完成后。