从google云存储java api上传firebase存储

Question

我有一个firebase帐户，我想以编程方式上传一些照片到firebase存储。为此，我使用了google cloud java storage API。我配置权限和其他权限。我可以成功地创建桶，斑点。然而，当我试图上传一张图片时，要么它的大小为0，要么它无法下载（不生成URL）。下面是我使用的代码；

        Storage storage = StorageOptions.newBuilder().setProjectId("firebaseId")
                .setCredentials(ServiceAccountCredentials.fromStream(new FileInputStream("jsonFileFor Authentication")))
                .build()
                .getService();
        String blobName = "a.jpg";
        BlobId blobId = BlobId.of(bucket.getName(), blobName);
        InputStream inputStream = new FileInputStream(new File("a.jpg"));
        //BlobInfo blobInfo = BlobInfo.builder(blobId).contentType("image/jpeg").build();
        BlobInfo blobInfo = BlobInfo.builder(bucket.getName(), "a.jpg").contentType("image/jpeg").build();

    try (WriteChannel writer = storage.writer(blobInfo)) {
        byte[] buffer = new byte[1024];
        int limit;
        try {
            while ((limit = inputStream.read(buffer)) >= 0) {
                writer.write(ByteBuffer.wrap(buffer, 0, limit));
            }

        } catch (Exception ex) {
            // handle exception
        }finally {
            writer.close();
        }
    }

任何建议都很感激。问候。