如何使用Angular JS Spring MVC上传多部分文件

$scope.continueFileUpload=function (){var uploadUrl=serverUrl+"continueFileUpload";var formData=new FormData();formData.append("file",file.files[0]); $http({        method: 'POST',        url: uploadUrl,        headers: {'Content-Type': undefined},        data: formData,        transformRequest: function(data, headersGetterFunction) {  return data;         }     })    .success(function(data, status) { alert("success");     })};