java - Upload a file using Spring MVC and Angular JS -

i trying upload csv file jsp controller. can able upload file sucessfully getting response 'syntax error:unexpected character @ line 1 column 1 of json parse using angular js'. need read data csv file , display in jsp page. when trying upload getting issue response.

jsp code:

<form action="robiibiaascsvupload/fileuploadinfo" id="fileuploadform"  method="post" enctype="multipart/form-data" data-ng-controller="fileuploadcontroller">    <table width="100%" border="0" cellspacing="5" cellpadding="0" id="uploadfile">    <tr>             <td align="left" valign="middle">upload file:</td><br/>             <td align="left" valign="middle">             <input name="file2" id="file2" type="file" file-model="file2"/><br/>             </td>              <td><input type="button" value="submit" ng-click="uploadformdata();"></td>            </tr>           <tr>     <td align="left" valign="middle">&nbsp;     </td>   </tr>   </table>   </form> 

javascript code:

var app = angular.module('formsubmit', []);       app.controller('fileuploadcontroller',function($scope,$http){          $scope.uploadformdata=function()         {             // headers: {'content-type': false},             // file2.files[0]             //alert(file2.files[0].name);             var omyform = new formdata();             omyform.append("file",file2.files[0]);              $http({                 method: 'post',                 url: 'uploadfile',                 headers: {'content-type': undefined},                 data: omyform,                 transformrequest: function(response, headersgetterfunction) {                      headers = {'content-type': 'application/json'};                     //alert(response);                      //return response;                           return response;                  },headers: { 'content-type': undefined }              }).success(function(data, headers) {                        alert(data);                  })                  .error(function(data, headers)                          {                         alert("exception"+data);                          });           }      }); 

spring mvc controller :

@requestmapping(value = "/uploadfile")     public @responsebody string uploadfile(httpservletrequest request,              @requestparam(value = "file") multipartfile file) {         stringbuilder result=null;         modelmap map=new modelmap();         try          {              system.out.println(file.getoriginalfilename());              system.out.println(file.getbytes());             inputstream in=file.getinputstream();             bufferedreader reader = new bufferedreader(new inputstreamreader(in));             result = new stringbuilder();             string line;             while((line = reader.readline()) != null) {                 result.append(line);                 result.append('\n');             }             map.addattribute("status", "success");             map.addattribute("list", result.tostring());             system.out.println(result.tostring());         } catch (ioexception e) {             // todo auto-generated catch block             e.printstacktrace();         }            return "success";     } 

please let me know went wrong.