AngularJS Formdata文件数组上传

Question

我试图一次性上传(实际上是POST)许多小文件以及一些键值对:

                $scope.uploadFiles = function(files) {

                    if (files.length === 0) {
                        return;
                    }

                    var formData = new FormData();
                    formData.append('keyName1', 'keyValue1');
                    formData.append('keyName2', 'keyValue2');
                    formData.append('keyName3', 'keyValue3');
                    for (var i = 0; i < files.length; i++) {
                        formData.append('files[]', files[i]);
                    }

                    $http.post( '/myEndpoint', formData, {
                        headers: { 'Content-Type': undefined },
                        transformRequest: angular.identity
                    }).success(function (result) {
                        console.log('YAY');
                    }).error(function () {
                        console.log('NAY');
                    });                 
                }

这是Java后端:

@RequestMapping(value = "/myEndpoint", method = RequestMethod.POST)
@ResponseBody
public void uploadFiles(
        @RequestParam("files") List<MultipartFile> fileList,
        @RequestParam("keyName1") String keyName1,
        @RequestParam("keyName2") String keyName2,
        @RequestParam("keyName3") String keyName3,
        HttpServletResponse response, HttpSession session) throws Exception {

    log.debug(fileList.size()); // Always logs zero
}

正在命中端点,但filesList长度为零.我也改变了

    List<MultipartFile> fileList to MultipartFile[] filesArray

但这并没有奏效.

请问有人可以解决一些问题吗？

干杯,

保罗

Answer 1

这可能对您有所帮助.

角度:

$scope.uploadFiles = function(files) {
    if (files.length === 0) {
        return;
    }

    var formData = new FormData();
    formData.append('keyName1', 'keyValue1');
    formData.append('keyName2', 'keyValue2');
    formData.append('keyName3', 'keyValue3');
    for (var i = 0; i < files.length; i++) {
        formData.append('file'+i, files[i]);
    }

    $http.post( '/myEndpoint', formData, {
        headers: { 'Content-Type': undefined },
        transformRequest: angular.identity
    }).success(function (result) {
        console.log('YAY');
    }).error(function () {
        console.log('NAY');
    });                 
}

在Spring/Java端:

RequestMapping(value = "/myEndpoint", method = RequestMethod.POST)
public @ResponseBody Object uploadFiles(MultipartHttpServletRequest request, HttpServletResponse response) throws IOException {
    //do stuff here...
    final String keyName1= request.getParameter('keyName1');
    //and so on......

    Iterator<String> iterator = request.getFileNames();
    MultipartFile multipartFile = null;
    while (iterator.hasNext()) {
        multipartFile = request.getFile(iterator.next());
        //do something with the file.....
    }
}

顺便说一下,在你有意义的一面,你总是可以一次性或多次请求结束文件.这取决于你想要实现的方式.