/**

     * 登陆方法

     */

    @ResponseBody

    @RequestMapping("login2")

    public Map<String, String> login2(UserVo userVo, Model model) {

        Map<String, String> res = new HashMap();

        String code = WebUtils.getHttpSession().getAttribute("code").toString();

        if(!userVo.getCode().equals(code)){

            model.addAttribute("error", SysConstast.USER_LOGIN_ERROR_MSG);

            res.put("code", "400");

            res.put("message", "验证码错误");

            return res;

        }

        User user = this.userService.login(userVo);

        if (null == user) {

            model.addAttribute("error", SysConstast.USER_LOGIN_ERROR_MSG);

            res.put("code", "302");

            res.put("address", "../login/toLogin.action");

            return res;

        }

        //放到session

        WebUtils.getHttpSession().setAttribute("user", user);

        //记录登陆日志 向sys_login_log里面插入数据

        LogInfoVo logInfoVo = new LogInfoVo();

        logInfoVo.setLogintime(new Date());

        logInfoVo.setLoginname(user.getRealname() + "-" + user.getLoginname());

        logInfoVo.setLoginip(WebUtils.getHttpServletRequest().getRemoteAddr());

        logInfoService.addLogInfo(logInfoVo);

        res.put("code", "200");

        res.put("address", "../login/mainIndex.action");

        return res;

    }

    @RequestMapping("mainIndex")

    public String mainIndex() {

        return "system/main/index";

    }

    /**

     * 得到登陆验证码

     *

     * @throws IOException

     */

    @RequestMapping("getCode")

    public void getCode(HttpServletResponse response, HttpSession session) throws IOException {

        // 定义图形验证码的长和宽

        LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(116, 36, 4, 5);

        session.setAttribute("code", lineCaptcha.getCode());

        ServletOutputStream outputStream = response.getOutputStream();

        ImageIO.write(lineCaptcha.getImage(), "JPEG", outputStream);

    }

    <div class="layui-form-item input-item" id="imgCode">

        <label for="code">验证码</label>

        <input type="text" placeholder="请输入验证码" autocomplete="off" name="code" id="code" class="layui-input">

        <img src="${ctx}/login/getCode.action" onclick="this.src=this.src+'?'">

    </div>