@RequestMapping("")

    public ModelAndView index(HttpSession session) {

        Object data = session.getAttribute("user");

        ModelAndView view = new ModelAndView("main/index");

        view.addObject("message", "验证失败，正在跳转中...");

        if (data != null) {

            return view;

        } else {

            return view;

        }

    }

  @RequestMapping(value = "test", method = RequestMethod.GET)

    public String test(Model model) {

        model.addAttribute("parametername", "handsome");

        return "test";

    }