1. 创建一个类  实现接口 HandlerInterceptor

2.重写接口中的方法

 1 public class adminInterceptoor implements HandlerInterceptor{
 2 
 3     @Override
 4     public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
 5             throws Exception {
 6         // TODO Auto-generated method stub
 7         
 8     }
 9 
10     @Override
11     public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
12             throws Exception {
13         // TODO Auto-generated method stub
14         
15     }
16 
17     @Override
18     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
19         Object admin = request.getSession().getAttribute("admin");
20         if(admin!=null) {
21             return true;
22         }else {
23             response.sendRedirect("../login.jsp");
24             return false;
25         }
26     }

 

3. 把创建的类配置到springMVC配置文件中

 

 

 

 

 

 

 

1. 拦截器(拦截都是控制层的地址。 filter: )

1. 创建一个类 实现接口 HandlerInterceptor

2. 重写接口的中方法

3. 把创建的类配置到springmvc文件中。