如何将带有json对象的文件发送到webservice以从angular 2继承webservice

Question

How to POST JSON and a file to web service with Angular?我尝试了此链接，但这会导致错误请求错误enter code here enter link description here

这是我的角度2代码

runImportRecordsJob(importRecords: any){
  let options = new RequestOptions();

  let formData = new FormData();
  let f={
    'country':"india",
    'bug':"bug",
  };

  formData.append("file", importRecords.file, importRecords.file.name);
  formData.append("data",f);

  const headers = new Headers();
  headers.append('Content-Type', undefined);

  return this.http.post(this.constantService.URL+'/data/fileupload',formData,{
    headers: headers}).map(this.constantService.extractData)
  .catch(this.constantService.handleError);
}

这是spring rest webservice

@ResponseBody
@RequestMapping(value = "/data/fileupload", method = RequestMethod.POST)
public String postFile(@RequestParam(value="file", required=false) MultipartFile file,
                   @RequestParam(value="data") Object data) throws Exception {
  System.out.println("data = " + data);

  return "OK!";
}

尝试调用此Web服务时，它会向我显示错误错误请求错误