问在Java API中复制到目标Google Cloud Bucket时，是否可以提供该目标的凭据？

EN

  def copy(inBucketName: String,
           inBlobName: String,
           outBucketName: String,
           outBlobName: String) = {

    val storage = StorageOptions.newBuilder
      .setCredentials(ServiceAccountCredentials.fromStream(new FileInputStream("key.json")))
      .build
      .getService
    val blobId = BlobId.of(inBucketName, inBlobName)
    val blob = storage.get(blobId)
    if (blob != null) {
      val copyWriter = blob.copyTo(outBucketName, outBlobName)
      val copiedBlob = copyWriter.getResult()
    }
  }