@RequestMapping("about")
  public void About(Model model, String id) {
    List<Article> aboutList = aboutService.getAboutList();
    model.addAttribute("aboutlist", aboutList);
    if (StringUtil.isNullOrEmpty(id) && aboutList.size() > 0) {
      id = String.valueOf(aboutList.get(0).getId());
    }

    model.addAttribute("classid", id);

    List<Article> aboutOneContent = aboutService.getAboutOneContent(id);
    model.addAttribute("aboutonecontent", aboutOneContent);
  }