拦截器(拦截都是控制层的地址。 filter: )

创建一个类 实现接口 HandlerInterceptor

package com.zhiyou100.wyf.interceptor;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;public class MyInterceptor implements HandlerInterceptor{  @Override  public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)      throws Exception {    System.out.println("结束");  }  @Override  public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)      throws Exception {        System.out.println("预备");      }  @Override  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {    Object name = request.getSession().getAttribute("name");    if(name!=null) {      return true;    }else {      response.sendRedirect("../denglu.jsp");      return false;    }  }}

重写接口的中方法

把创建的类配置到springmvc文件中。