spring mvc 写app接口 如何处理ios端传过来的一个nsdata数组？

@RequestMapping(value = "/perfectUserInfo")
public @ResponseBody
RspBody<UserProjectInfo> perfectUser(Long id,String user_nickName,Integer user_sex,String user_signature,HttpServletRequest request,HttpServletResponse response) {
HashMap<String, Object> params = new HashMap<String, Object>();
String year = "/" + StringUtil.getDayTime(new Date());//获取当前日期时间字符串
RspBody<UserProjectInfo> res = new RspBody<UserProjectInfo>();
List<UserProjectInfo> gvts = new ArrayList<UserProjectInfo>();
try{
String toPath = PropertiesUtil.getValue("upload.properties", "toPath")+year+"/";
String uploadDir = PropertiesUtil.getValue("upload.properties", "imageUploadPath")+year;
File dirPath = new File(uploadDir);
if (!dirPath.exists()) {
dirPath.mkdirs();
}
String fileNameFull="";
String suffix ="";
String fileName = "";
String filepasth = "";
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
String uuid = UUID.randomUUID().toString();
for (Iterator<String> it = multipartRequest.getFileNames(); it.hasNext();) {
String key = it.next();
MultipartFile file = multipartRequest.getFile(key);
InputStream stream = file.getInputStream();
suffix =file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
fileName = uuid + suffix;
fileNameFull = uploadDir +File.separator +fileName;
filepasth = toPath+fileName;
System.out.println("==+"+fileNameFull);
//图片文件压缩
BufferedImage srcImg = null;
srcImg = ImageIO.read(stream); //获取文件流
ImageCompression.compressImage(srcImg, fileNameFull, 1200);
}
UserProjectInfo info =null;
UserContInfo task = charyUserServiceImpl.getBeanId(id);
if(StringUtil.isEmpty(user_nickName)){
task.setUser_nickname(user_nickName);
}
if(user_sex!=null){
task.setUser_sex(user_sex);
}
if(StringUtil.isEmpty(user_signature)){
task.setSignature(user_signature);
}
if(StringUtil.isEmpty(filepasth)){
task.setUser_img(filepasth);
}

charyUserServiceImpl.updateInfo(task);
UserContInfo evint = charyUserServiceImpl.getBeanId(id);
info = new UserProjectInfo();
info.setLogin_token(evint.getAppToken());
info.setUser_id(evint.getUser_id()+"");
info.setUser_img(evint.getUser_img());
info.setUser_nickName(evint.getUser_nickname());
info.setUser_sex(evint.getUser_sex()+"");
info.setUser_signature(evint.getSignature());
info.setUser_type(evint.getType()+"");
gvts.add(info);
res.setCode(1); //1请求成功 2失败
res.setMessage("成功");
res.setData(gvts);

} catch (Exception e) {
res.setCode(2); //1请求成功 2失败
res.setMessage("失败");
e.printStackTrace();
}

return res;
}


怎样可以实现单图和多图上传功能