package com.eu.weh.web;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import javax.servlet.http.HttpSession;

 import org.springframework.web.servlet.HandlerInterceptor;

 import org.springframework.web.servlet.ModelAndView;

 import com.eu.weh.bean.User;

 /**

  *

  * @ClassName: LoginInterceptor

  * @Description: 登录拦截器

  * @author Administrator

  * @date 2019年4月29日 上午10:31:25

  *

  */

 public class LoginInterceptor implements HandlerInterceptor {

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

             throws Exception {

         //判断当前用户是否已经登录

         HttpSession session = request.getSession();

         User loginUser = (User) session.getAttribute("dbUser");

         if (loginUser == null) {

             String path = session.getServletContext().getContextPath();

             response.sendRedirect(path+"/login");

             return false;

         }else {

             return true;

         }

     }

     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,

             ModelAndView modelAndView) throws Exception {

     }

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

             throws Exception {

     }

 }

 <mvc:interceptors>

         <mvc:interceptor>

             <mvc:mapping path="/**" />

             <mvc:exclude-mapping path="/login" />

             <mvc:exclude-mapping path="/doAJAXlogin" />

             <mvc:exclude-mapping path="/bootstrap/**" />

             <mvc:exclude-mapping path="/css/**" />

             <mvc:exclude-mapping path="/fonts/**" />

             <mvc:exclude-mapping path="/img/**" />

             <mvc:exclude-mapping path="/jquery/**" />

             <mvc:exclude-mapping path="/layer/**" />

             <mvc:exclude-mapping path="/script/**" />

             <mvc:exclude-mapping path="/ztree/**" />

             <bean class="com.eu.weh.web.LoginInterceptor"></bean>

         </mvc:interceptor>

     </mvc:interceptors>