springmvc 全局登陆 拦截器配置

最近在做一个管理系统，要求是首页是登陆界面 ，我的DispatcherServlet servlet 是过滤所有的请求

<!-- Map all requests to the DispatcherServlet for handling -->	<servlet-mapping>		<servlet-name>DispatcherServlet</servlet-name>		<url-pattern>/*</url-pattern>	</servlet-mapping>

    @RequestMapping(value = {"","/","index.html"})    public String index() {	return "index";    }

上面的代码是为了设置欢迎页面在首页的登陆界面中，form 表单的地址是 "/login" 以上是我的项目的背景，下面是正式的登陆代码实现我们对全局的拦截登陆

public class GlobalLoginInterceptor implements HandlerInterceptor {  pblic boolean preHandle(HttpServletRequest request,	    HttpServletResponse response, Object handler) throws Exception {	String requesturi = request.getRequestURI();	String contextPath = request.getContextPath();	String url = requesturi.substring(contextPath.length());	//当所访问的地址是首页，或者是 登陆表彰的form acion 路径时，我们不对他进行拦截	if(url.endsWith("/")||url.endsWith("index.html")||url.endsWith("login")){	    return true;	}	   		User attribute = (User) request.getSession().getAttribute(			"user");		// 判断是否有Session ，如果不存在，则跳转到登陆页面		if (attribute == null) {		    response.sendRedirect(contextPath+"/index.html");		    // request.getRequestDispatcher("/").forward(request,		    // response);		    return true;		}			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 {    }}

以上是我主要的拦截核心代码，如有不正确的，可能给我留言，谢谢。