@RequestMapping("/GroupInfo")
  @ResponseBody
  public ModelAndView groupInfo(HttpServletRequest request) throws Exception {
    ModelAndView mav = new ModelAndView("business/common/groupInfo");

    String groupId = request.getParameter("groupId");
    BoothGroupDto groupDto = resManage.getBoothGroupInfo(groupId);

    AttachFileDto attachFileDto = null;
    String attachFileId = groupDto.getAttachFile();
    if (!StringUtils.isEmpty(attachFileId)) {
      attachFileDto = attachFile.getFileInfo(attachFileId);
    }

    mav.addObject("groupDto", groupDto);
    mav.addObject("attachFileDto", attachFileDto);

    return mav;
  }