首先在springMVC.xml配置如下代码

然后再创建一个class实现想要拦截的方法即可，如（对应如上配置文件class路径）

package com.base;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import com.ujia.entity.User;public class AccessFilter implements HandlerInterceptor{    @Override    public void afterCompletion(HttpServletRequest arg0,            HttpServletResponse arg1, Object arg2, Exception arg3)            throws Exception {        // TODO Auto-generated method stub            }    @Override    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,            Object arg2, ModelAndView arg3) throws Exception {        // TODO Auto-generated method stub            }    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,            Object arg2) throws Exception {        //获取登录session        User user =(User) request.getSession().getAttribute("user");        //如果访问请求为首页，则通过        if(request.getRequestURI().startsWith(request.getContextPath()+"/spring/index.htm")){            return true;        }else if(null==user){            //如果没有登录session，则返回到首页            response.sendRedirect(request.getContextPath()+"/spring/index.htm");            return false;        }        return true;    }}

只需实现preHandle，所有请求都将先经过这个方法

拦截特殊请求，在springMVC配置里面加上