Spring Mvc拦截器的配置

最新推荐文章于 2023-03-10 12:43:02 发布

原创最新推荐文章于 2023-03-10 12:43:02 发布 · 255 阅读

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本文介绍了如何在Spring Mvc中配置拦截器，强调了版本要求为3.2或以上以避免<mvc:exclude-mapping>标签的错误。配置包括设置拦截路径和排除路径，并提供了实现HandlerInterceptor接口的示例代码，展示了preHandle方法中进行Session验证的逻辑。

在Spring Mvc中配置如下：

特别需要注意http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd，版本必须是3.2或者以上，3.2以下<mvc:exclude-mapping>标签会报错

<mvc:interceptors>
        <mvc:interceptor>

   <mvc:mapping path="/**" />
   
           <mvc:exclude-mapping path="/user/**"/>
           <mvc:exclude-mapping path="/code/**"/>
    <bean class="com.stu.controller.InterceptorController"/>
   </mvc:interceptor>
   </mvc:interceptors>

写一个类实现HandlerInterceptor接口

package com.stu.controller;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import com.stu.bean.User;
import com.stu.service.OtherService;

public class InterceptorController implements HandlerInterceptor{

   @Resource
   private OtherService otherService;

   @Override
   public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)throws Exception {
       //请求的资源
       String requestUrl = request.getRequestURI();

       //请求的路径
String contextPath = request.getContextPath();

System.out.println("用户请求");

if(contextPath.endsWith("/stu")) {
   //拦截成功,处理用户的Session
   User user = (User)request.getAttribute("user");
   if(user != null) {
       if(otherService.checkUsername(user)) {
       System.out.println("匹配");
       return true;
   }else {
       System.out.println("不匹配");
   }
   }else {
       response.sendRedirect(contextPath + "/user/showLogin");
       System.out.println("session不存在");
       return false;
   }
}
       return false;
   }

   @Override
   public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
           ModelAndView modelAndView) throws Exception {
       // TODO Auto-generated method stub

   }

   @Override
   public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
           throws Exception {
       // TODO Auto-generated method stub
   }
}