@RequestMapping("/login")
    public String login(HttpServletRequest request, @RequestParam("userName") String userName, @RequestParam("passWord") String passWord) {
        String res = userService.check_userName(userName);
        if (!res.equals("registed")) {
            return "userName has not registed";
        }   
        String str = userService.check_userName_and_passWord(userName, passWord);
        if (str.equals("success")){
            //第一步：获取session fhadmin.cn
            HttpSession session = request.getSession();
            //第二步：将想要保存到数据存入session中
            session.setAttribute("userName",userName);
            session.setAttribute("password",passWord);
            //这样就完成了用户名和密码保存到session的操作
        }
        return str;
    }