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如何从谷歌驱动器读取大文件到gae blobstore

[英]How to read large files from google drive into gae blobstore

这是我目前用于将文件从谷歌驱动器读入谷歌应用引擎的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做我想做的事情?

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();

回报

new Drive.Builder(httpTransport, jsonFactory, cred)
            .build()

您可以从驱动器中以块的形式下载该文件。 使用下载请求中的Range标头,如Google云端硬盘文档中所述

Range: bytes=500-999

此FilsService和FileWriteChannel api已被弃用,以支持App Engine GCS客户端。

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