Spring拦截器HandlerInterceptor接口代码解析

public class someInterceptor implements HandlerInterceptor{
 public boolean preHandle(HttpServletRequest req,HttpServletResponse resp,Object handler)throws Exception{
  //TODO 处理器执行前被调用
  return true;
 }

 publilc void postHandle(HttpServletRequest req,HttpServletResponse resp,Object handler,ModelAndView mv)throws Exception{
  //TODO 处理器执行后被调用
 }

 public void afterCompletion(HttpServletRequest req,HttpServletResponse resp,Object handler,Exception e)throws Exception{
  //TODO全部执行完成后调用
 }
}

<mvc:interceptors>
 <mvc:interceptor>
  <mvc:mapping path="/org/*"/>
  <mvc:exclude-mapping path="/login/*"/>
  <bean class="org.vipcpi.interceprot.someInterceptor"/>
 </mvc:interceptor>
</mvc:interceptors>