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@RequestMapping(value = "/edit/update", method = RequestMethod.POST)
public String update(@Valid BookForm form, BindingResult result, Model model,
@RequestParam(value="uploadFile",required=false) MultipartFile file) {
  logger.info("update start");
  if (file.getSize() > uploadFileSize) {
    result.rejectValue("cover", "error.fileSize",
    new Object[]{uploadFileSize},"File size error");
  }
  if (result.hasErrors()) {
    return "editBook";
    }
  ///
}