首先在springmvc中配置拦截器

 

然后写拦截器：

public class LoginInterceptor 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 arg0, HttpServletResponse arg1, Object arg2) throws Exception {		HttpSession session = arg0.getSession();		//String uri = request.getRequestURI(); // 获取登录的uri，这个是不进行拦截的		//if(session.getAttribute("LOGIN_USER")!=null || uri.indexOf("system/login")!=-1) {// 说明登录成功 或者 执行登录功能					if(session.getAttribute("admin")!=null) {			// 登录成功不拦截			return true;		}else {			// 拦截后进入登录页面			arg1.sendRedirect(arg0.getContextPath()+"/admin/loginPage.action");			return false;		}	}}

　　拦截器这样就设置好了