如何使用js将文件的参数传入到后台

页面代码：

#js 代码 function onUpload(val) { var fileId="file_"+val;

    var formData = new FormData();
    // 获取文件
    var fileData =  $("#"+fileId).prop("files")[0];
    // var fileData = $("#file").prop("files")[0];
    console.log(fileData);
    debugger;
    formData.append("file", fileData);
    formData.append("id",val);
    // formData.append("goodsName",goodsName);
    // formData.append("xinhao",xinhao);
    $.ajax({
        url: '/zhijianfilesuploadhuihuo',
        type: 'POST',
        async: false,
        data: formData,
        cache: false,
        contentType: false,
        processData: false,
        success: function (data) {
            //alert(data);
        }
    });

}

、、 @RequestMapping(value = "zhijianfilesuploadhuihuo",method = RequestMethod.POST)
public String zhijianfilesupload(MultipartFile file,
@RequestParam(name = "id",required = false)Long id,