java将图像文件存储在Google云存储桶中后,显示大小为“0字节”的所有文件列表
我遵循的步骤是:
1)将图像存储在Blobstore中。(这是必要的) 2) 从blobstore获取图像并将其保存在GCS bucket中
如果我将图像文件直接存储到GCS bucket中,那么它可以正常工作。 但我想从Blobstore拿
Map<String, List<BlobInfo>> blobsData = blobstoreService.getBlobInfos(req);
for (String key : blobsData.keySet())
{
for(BlobInfo blob:blobsData.get(key))
{
byte[] b = new byte[(int)blob.getSize()];
BlobstoreInputStream in = new BlobstoreInputStream(blob.getBlobKey());
in.read(b);
GcsService gcsService = GcsServiceFactory.createGcsService();
GcsFilename filename = new GcsFilename("casfilestorage", blob.getFilename());
GSFileOptionsBuilder builder = new GSFileOptionsBuilder()
.setAcl("public_read")
.setBucket(BUCKET_NAME)
.setKey(blob.getFilename())
.setMimeType(blob.getContentType());
AppEngineFile writableFile = fileService.createNewGSFile(builder.build());
boolean lock = true;
writeChannel = fileService.openWriteChannel(writableFile, lock);
os = Channels.newOutputStream(writeChannel);
UploadOptions uploadOptions = UploadOptions.Builder.withGoogleStorageBucketName("casgaestorage");
//String uploadUrl = blobstoreService.createUploadUrl("/serve", uploadOptions);
os.close();
writeChannel.closeFinally();
in.close();
}
}
# 1 楼答案
参考下面的代码,只需将字节[]传递给write方法: