允许用户使用BlobstoreService上传并保存文件到我的GCS Bucket，如何识别上传的文件？

Question

请帮忙。我正在尝试使用BlobstoreService将视频文件（.mp4）上传到GCS bucket。

文件成功上传并自动保存在我的GCS桶中，客户端收到的关键upload_result值是。
问题是，我不知道如何识别上传的文件保存在我的桶中的Blosstore Service和如何获得其他信息例如请求中的foo和bar键值。

文档中说我可以使用BlobInfo#getGsObjectName（）来获取名称，但该方法现在似乎不可用
我可以从请求中获得“blobkey”，但我认为它只适用于Blobstore，不适用于GCS
是的，我可以得到原始文件名，但原始文件名在GCS中丢失，只有对象名。

com.google.appengine.api.blobstore.BobInfohttps://cloud.google.com/appengine/docs/java/javadoc/com/google/appengine/api/blobstore/BlobInfo.html#getGsObjectName--

///// JSP ///////
<%!
final String BUCKT_NAME = "my_bucket";
final long MAX_SIZE = 1024 * 1024 * 300;
String uploadURL;

BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
UploadOptions uploadOptions = UploadOptions.Builder
                               .withGoogleStorageBucketName(BUCKET_NAME)
                               .maxUploadSizeBytes(MAX_SIZE);
uploadURL = blobstoreService.createUploadUrl("/handler", uploadOptions);
%>


///// HTML Form ///////
<form id="file_upload_form" action="" method="post" enctype="multipart/form-data">
    <input type="file" name="uploaded_file">
    <button type="button">UPLOAD</button>
    <input type="hidden" name="foo" value="bar"> <-- I want to upload additional information with the video file.
</form>


///// ajax ///////

function uploadFile(){
    var fd = new FormData($('#file_upload_form').get(0));
    $.ajax({
        url: "<%=uploadURL %>",
        type: 'POST',
        data: fd,
        processData: false,
        contentType: false,
        dataType: 'json'
    })
        .done(function( data ) {
        if(data['upload_result'] == 'YES'){
            //Do sometihng
        }
        else{
            //Do something
        }
    });
}

///// SERVLET(Slim3 Controller) (/handler) ///////

private Navigation doPost() {
HttpServletRequest httpServletRequest = RequestLocator.get();
BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
Map<String, List<BlobKey>> blobs = blobstoreService.getUploads(httpServletRequest);
List<BlobKey> blobKeys = blobs.get("uploaded_file");
BlobKey fileKey = blobKeys.get(0);
BlobInfoFactory blobInfoFactory = new BlobInfoFactory();
BlobInfo blobInfo = blobInfoFactory.loadBlobInfo(fileKey);

String originalFileName = blobInfo.getFilename();
long filesize = blobInfo.getSize();
//String gcsObjectName = blobInfo.getGsObjectName(); <<-- Most important thing is not available.

if(blobKey!=null){
    String result = "{\"upload_result\":\"YES\"}";
        response.setCharacterEncoding("utf-8");
        response.setContentType("application/json");
        try {
            response.getWriter().println(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
}
return null;

编辑。使用FileInfo而不是BlobInfo来获取生成的GCS对象名。以下是本案例的工作代码。

BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
Map<String, List<FileInfo>> fileInfos = blobstoreService.getFileInfos(request);
List<FileInfo> infos = fileInfos.get("uploaded_file");
FileInfo info = infos.get(0);
String gcsObjectName = info.getGsObjectName(); // <--

Answer 1

blob密钥是gcs和blobstore的唯一标识符——更多详细信息请参见此处https://cloud.google.com/appengine/docs/java/blobstore/#Java_Using_the_Blobstore_API_with_Google_Cloud_Storage.对于地面军事系统，您可以使用以下命令

BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
BlobKey blobKey = blobstoreService.createGsBlobKey(
    "/gs/" + fileName.getBucketName() + "/" + fileName.getObjectName());
blobstoreService.serve(blobKey, resp);