这是我目前用于将文件从 google drive 读取到 google app engine 的 blobstore 的代码。
private BlobKey getBlobKey(File f, DriveObject driveObject)
throws IOException, MalformedURLException {
Drive service = ((GoogleDrive) driveObject).getService();
byte[] buffer = new byte[(int) f.getFileSize().intValue()];
GenericUrl url = new GenericUrl(f.getDownloadUrl());
HttpResponse response = service.getRequestFactory()
.buildGetRequest(url).execute();
InputStream is = response.getContent();
FileService fileService = FileServiceFactory.getFileService();
AppEngineFile file = null;
boolean lock = true;
try {
file = fileService.createNewBlobFile("application/zip");
FileWriteChannel writeChannel = fileService.openWriteChannel(
file, lock);
int len;
while ((len = is.read(buffer)) >= 0) {
ByteBuffer bb = ByteBuffer.wrap(buffer, 0, len);
writeChannel.write(bb);
}
writeChannel.closeFinally();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
BlobKey bk = fileService.getBlobKey(file);
return bk;
}
这适用于小文件，但如果文件大于 ~25MB，则会出错。有没有更好的方法来完成我想做的事情？
这是我看到的错误
Uncaught exception from servlet
com.google.appengine.api.urlfetch.ResponseTooLargeException: The response from url https://doc-0o-bs-docs.googleusercontent.com/docs/securesc/97o44sjeam7f23b1flie9m3qqidhrago/97q4akk8bmpub24itqhclo1vakjusu84/1368259200000/14350098165097390874/14350098165097390874/0ByS2XCxCEzq-NUVuajAwWGVoR1U?h=16653014193614665626&e=download&gd=true was too large.
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.convertApplicationException(URLFetchServiceImpl.java:132)
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:43)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.fetchResponse(URLFetchServiceStreamHandler.java:417)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getInputStream(URLFetchServiceStreamHandler.java:296)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getResponseCode(URLFetchServiceStreamHandler.java:149)
at com.google.api.client.http.javanet.NetHttpResponse.<init>(NetHttpResponse.java:37)
at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:95)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:980)
我应该补充一点
Drive service = ((GoogleDrive) driveObject).getService();
返回
new Drive.Builder(httpTransport, jsonFactory, cred)
.build()
最佳答案
您可以从云端硬盘分块下载文件。使用 Range下载请求中的 header ，如 Google Drive documentation 中所述.
Range: bytes=500-999
关于java - 如何从谷歌驱动器读取大文件到 gae blobstore，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16495827/