解決layui上傳文件提示上傳異常,實際文件已經上傳成功的問題

@ResponseBody
@RequestMapping("/web/upload")
public JSONObject uploadSourceData(@RequestParam(value="file") MultipartFile file ){
String filePath = “”;
String fileName = filePath+System.currentTimeMillis()+"_"+file.getOriginalFilename(); //上傳后的文件名 原始文件名加上時間戳
FileOutputStream out;
JSONObject resObj = new JSONObject();
resObj.put("msg", "ok");
try {
out = new FileOutputStream(new File(fileName));
IOUtils.copy(file.getInputStream(), out);
out.close();
} catch (Exception e) {
// TODO Auto-generated catch block
resObj.put("msg", "error");
e.printStackTrace();
}
return resObj;
}