允许用户使用BlobstoreService将文件上传并保存到我的GCS Bucket，如何识别上传的文件

Question

请提供帮助。我正在尝试使用BlobstoreService将视频文件(.mp4)上传到GCS bucket。

该文件成功上传并自动保存在我的GCS Bucket中，客户端收到密钥"upload_result"的值"YES">
问题是我不知道如何识别BlobstoreService保存在我的bucket中的上传文件，以及如何从请求中获取其他信息，如"foo"one_answers"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，而不适用于GCS
是的，我可以获得原始文件名，但GCS中丢失了原始名称，只有对象名。

com.google.appengine.api.blobstore.BlobInfohttps://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对象名称。这是本例的工作代码。

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键是gc和blobstore的唯一标识符-更多详细信息请点击此处https://cloud.google.com/appengine/docs/java/blobstore/#Java_Using_the_Blobstore_API_with_Google_Cloud_Storage.对于GC，您使用以下

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