springmvc非参数列表接收上传多个文件

@RequestMapping(value = "/addComplaintInfo",method = RequestMethod.POST)
 public HashMap<Object, Object> addComplaintInfo(ComplaintInfo complaintInfo, HttpServletRequest request) throws IOException, DocumentException {
     try {
         MultipartFile shouquanFile = null;
         MultipartFile cardFile = null;
         MultipartFile zuozhengFile = null;
         boolean isMultipart = ServletFileUpload.isMultipartContent(request);
         if (isMultipart) {
             MultipartHttpServletRequest multipartRequest = WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
             shouquanFile = multipartRequest.getFile("shouquanfile");
             if (null!=shouquanFile) {
                 String originalshouquanFile = shouquanFile.getOriginalFilename();
                 // 文件保存路径
                 String filePath = GetPicUrlUtils.getPicUrl(originalshouquanFile);
                 // 转存文件
                 shouquanFile.transferTo(new File(filePath));
                 complaintInfo.setShouquanFileName(originalshouquanFile);
                 complaintInfo.setShouquanFile(filePath);
             }
             cardFile = multipartRequest.getFile("cardfile");
             if (null!=cardFile) {
                 String originalcardFile = cardFile.getOriginalFilename();
                 // 文件保存路径
                 String filePath = GetPicUrlUtils.getPicUrl(originalcardFile);
                 // 转存文件
                 cardFile.transferTo(new File(filePath));
                 complaintInfo.setCardFileName(originalcardFile);
                 complaintInfo.setCardFile(filePath);
             }
             zuozhengFile = multipartRequest.getFile("zuozhengfile");
             if (null!=zuozhengFile) {
                 String originalzuozhengFile = zuozhengFile.getOriginalFilename();
                 // 文件保存路径
                 String filePath = GetPicUrlUtils.getPicUrl(originalzuozhengFile);
                 // 转存文件
                 zuozhengFile.transferTo(new File(filePath));
                 complaintInfo.setZuozhengFileName(originalzuozhengFile);
                 complaintInfo.setZuozhengFile(filePath);
             }
         }
         int i = this.complaintInfoService.addComplaintInfoWEB(complaintInfo);  if (i > 0) {
             return ResultJson.success("1", "投诉登记成功！", "");
         }

     }catch (Exception e){
         return ResultJson.success("2", "投诉登记系统异常！", "");
     }
    return ResultJson.success("0", "投诉登记失败！", "");
}