/**
   * 删除Controller
   *
   * @param session
   * @param model
   * @param docid
   * @return
   */
  @RequestMapping(params = "method=delete", method = RequestMethod.GET)
  public String delete(HttpSession session, Model model, Integer docid) {
    User user = (User) session.getAttribute("user");
    if (user != null) {
      Document document = documentService.getById(docid);

      documentService.delete(docid);
      // 回滚积分
      retPoint(user, document);

      model.addAttribute("user", user);
      return "redirect:document?method=list";
    } else return "error";
  }