@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";    }