SpringMVC 之 mvc:exclude-mapping 不拦截某个请求

淡淡的烟草味﹌ 2022-04-10 13:58 130阅读 0赞

在使用 SpringMVC 是，配置了一个 Session 拦截器，用于拦截用户是否登录，但是用户访问登录页面和注册页面时就不需要拦截了，这时就需要用到这个标签了 <mvc:execlude-mapping />。

代码上来先：

> ![复制代码][copycode.gif]
> 
>     
>         
>         <mvc:interceptors>
>             <mvc:interceptor>
>                 
>                 <mvc:mapping path="/**" />
>                 
>                 <mvc:exclude-mapping path="/login.html" />
>                 <mvc:exclude-mapping path="/account/login.do" />
>                 <mvc:exclude-mapping path="/account/regist.do" />
>                 <bean class="com.msym.cloudnote.interceptors.SessionInterceptor" />
>             </mvc:interceptor>
>         </mvc:interceptors>
> 
> ![复制代码][copycode.gif]
> 
>

**有一点要注意：**

> 就是上面的【拦截】和【不拦截】，【拦截】的标签要写在上面。

拦截器的代码：

> ![复制代码][copycode.gif]
> 
>     package com.msym.cloudnote.interceptors;
>     
>     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;
>     
>     /**
>      * 判断是否登录的拦截器
>      * @author 码上猿梦
>      *  http://www.cnblogs.com/daimajun/
>      */
>     public class SessionInterceptor  implements HandlerInterceptor {
>     
>         
>         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 {
>             
>         }
>     
>         public boolean preHandle(HttpServletRequest req, HttpServletResponse res, Object handel) throws Exception {
>             HttpSession session = req.getSession();
>             // 从session当中获取特定的数据
>             Object obj = session.getAttribute("name");
>             if (obj == null) {
>                 // 未登录，重定向到登录页面
>                 res.sendRedirect(req.getContextPath()+"/login.html");
>                 return false;
>             }
>             // 已登录，继续向后调用
>             return true;
>         }
>     }
> 
> ![复制代码][copycode.gif]

[copycode.gif]: /images/20220328/0beab88a2d2f4bb8869b2c463bac7525.png