nutzwk，前端html表单包含图片上传，提交到后台的HttpServletRequest的parameterMap值为0，我不选择图片上传直接提交后就没问题，求指教

<label for="imageName" class="col-sm-2 control-label">图片路径：</label>
                                                        <div class="col-sm-3">
                                                            <div id="queue"></div>
                                                            <div>
                                                                <input id="file_upload" name="file_upload" type="file" multiple="false">
                                                            </div>
                                                            <input type="hidden" id="imageName" name="imageName" value="" >
                                                        </div>

$('#file_upload').uploadifive({
            'auto': true,
            'multi': false,
            'width': '100%',
            'height': '35',
            'buttonText': '请选择图片',
            'fileType': 'image/jpg,image/jpeg,image/png',
            'fileSizeLimit': 1024,
            'queueSizeLimit': 1,
            'formData': {},
            'queueID': 'queue',
            'uploadScript': '${base}/open/file/upload/image',
            'onUploadComplete': function (file, data) {
                data = JSON.parse(data);
                if (data.code == 0) {
                    Toast.success(data.msg);
                    $("#imageName").val('http://${AppDomain}${base}'+data.data);
                } else {
                    clearFile();
                    Toast.error(data.msg);
                }
            },
            'onDrop': function (file, fileDropCount) {
                clearFile();
            },
            'onClearQueue': function (queue) {
                clearFile();
            },
            'onCancel': function () {
                clearFile();
            }
        });