Question

我正在尝试从GAE中的“上传成功”处理程序获取文件内容。文件上传到网址：

blobstoreService.createUploadUrl("/onupload", uploadOptions));

所以，在/onupload中，我的表现如下：

BlobKey myFile = context.getRequestBlobs().get("myFile").get(0);

然后我试过了：

InputStream is = new BlobstoreInputStream(myFile);
// .. read the stream

以com.google.appengine.api.blobstore.BlobstoreInputStream$BlobstoreIOException: BlobstoreInputStream received an invalid blob key: =?ISO-8859-1?Q?AMIfv96J=2DsyIbhm5=5FET?=

失败

和

FileReadChannel ch = fileService.openReadChannel(myFile, false);

失败

java.io.IOException
    at com.google.appengine.api.files.FileServiceImpl.translateException(FileServiceImpl.java:615)
    at com.google.appengine.api.files.FileServiceImpl.makeSyncCall(FileServiceImpl.java:588)
    at com.google.appengine.api.files.FileServiceImpl.open(FileServiceImpl.java:521)
    at com.google.appengine.api.files.FileServiceImpl.openForRead(FileServiceImpl.java:481)
    at com.google.appengine.api.files.FileServiceImpl.openForRead(FileServiceImpl.java:473)
    at com.google.appengine.api.files.FileServiceImpl.openReadChannel(FileServiceImpl.java:197)

关于我做错了什么的想法，是否有可能在上传手册中阅读文件的内容？

注意，对于blobstore fs（不是GS），它工作正常。

Answer 1

我认为您正在尝试从Google云存储中读取文件。你在文档上看到了例子[1]吗？

特别是这部分：

/ At this point, the file is visible in App Engine as:
// "/gs/BUCKETNAME/FILENAME"
// and to anybody on the Internet through Cloud Storage as:
// (http://storage.googleapis.com/BUCKETNAME/FILENAME)
// We can now read the file through the API:
String filename = "/gs/" + BUCKETNAME + "/" + FILENAME;
AppEngineFile readableFile = new AppEngineFile(filename);
FileReadChannel readChannel =
    fileService.openReadChannel(readableFile, false);
// Again, different standard Java ways of reading from the channel.
BufferedReader reader =
         new BufferedReader(Channels.newReader(readChannel, "UTF8"));
String line = reader.readLine();
resp.getWriter().println("READ:" + line);

// line = "The woods are lovely, dark, and deep."
readChannel.close();

[1] https://developers.google.com/appengine/docs/java/googlestorage/overview#Complete_Sample_App

无法在上传成功处理程序中阅读Google Storage Cloud文件

1 个答案: