解决layui上传文件提示上传异常,实际文件已经上传成功的问题

@ResponseBody@RequestMapping("/web/upload")public JSONObject uploadSourceData(@RequestParam(value="file") MultipartFile file ){String filePath = “”;String fileName = filePath+System.currentTimeMillis()+"_"+file.getOriginalFilename(); //上传后的文件名  原始文件名加上时间戳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 blockresObj.put("msg", "error");e.printStackTrace();}return resObj;}