Java Code Examples for com.google.cloud.storage.Blob#downloadTo()

public static void downloadRequesterPaysObject(
    String projectId, String bucketName, String objectName, Path destFilePath) {
  // The project ID to bill
  // String projectId = "my-billable-project-id";

  // The ID of your GCS bucket
  // String bucketName = "your-unique-bucket-name";

  // The ID of your GCS object
  // String objectName = "your-object-name";

  // The path to which the file should be downloaded
  // Path destFilePath = Paths.get("/local/path/to/file.txt");

  Storage storage = StorageOptions.getDefaultInstance().getService();
  Blob blob = storage.get(BlobId.of(bucketName, objectName));
  blob.downloadTo(destFilePath, Blob.BlobSourceOption.userProject(projectId));

  System.out.println(
      "Object " + objectName + " downloaded to " + destFilePath + " and billed to " + projectId);
}
 

public static void downloadEncryptedObject(
    String projectId,
    String bucketName,
    String objectName,
    Path destFilePath,
    String decryptionKey)
    throws IOException {

  // The ID of your GCP project
  // String projectId = "your-project-id";

  // The ID of your GCS bucket
  // String bucketName = "your-unique-bucket-name";

  // The ID of your GCS object
  // String objectName = "your-object-name";

  // The path to which the file should be downloaded
  // Path destFilePath = Paths.get("/local/path/to/file.txt");

  // The Base64 encoded decryption key, which should be the same key originally used to encrypt
  // the object
  // String decryptionKey = "TIbv/fjexq+VmtXzAlc63J4z5kFmWJ6NdAPQulQBT7g=";

  Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();

  Blob blob = storage.get(bucketName, objectName);
  blob.downloadTo(destFilePath, Blob.BlobSourceOption.decryptionKey(decryptionKey));

  System.out.println(
      "Downloaded object "
          + objectName
          + " from bucket name "
          + bucketName
          + " to "
          + destFilePath
          + " using customer-supplied encryption key");
}
 

public static void downloadPublicObject(
    String bucketName, String publicObjectName, Path destFilePath) {
  // The name of the bucket to access
  // String bucketName = "my-bucket";

  // The name of the remote public file to download
  // String publicObjectName = "publicfile.txt";

  // The path to which the file should be downloaded
  // Path destFilePath = Paths.get("/local/path/to/file.txt");

  // Instantiate an anonymous Google Cloud Storage client, which can only access public files
  Storage storage = StorageOptions.getUnauthenticatedInstance().getService();

  Blob blob = storage.get(BlobId.of(bucketName, publicObjectName));
  blob.downloadTo(destFilePath);

  System.out.println(
      "Downloaded public object "
          + publicObjectName
          + " from bucket name "
          + bucketName
          + " to "
          + destFilePath);
}
 

private static void blur(BlobInfo blobInfo) throws IOException {
  String bucketName = blobInfo.getBucket();
  String fileName = blobInfo.getName();

  // Download image
  Blob blob = storage.get(BlobId.of(bucketName, fileName));
  Path download = Paths.get("/tmp/", fileName);
  blob.downloadTo(download);

  // Construct the command.
  Path upload = Paths.get("/tmp/", "blurred-" + fileName);
  List<String> args = List.of("convert", download.toString(), "-blur", "0x8", upload.toString());
  try {
    ProcessBuilder pb = new ProcessBuilder(args);
    Process process = pb.start();
    process.waitFor();
  } catch (Exception e) {
    logger.info(String.format("Error: %s", e.getMessage()));
  }

  // Upload image to blurred bucket.
  BlobId blurredBlobId = BlobId.of(BLURRED_BUCKET_NAME, fileName);
  BlobInfo blurredBlobInfo =
      BlobInfo.newBuilder(blurredBlobId).setContentType(blob.getContentType()).build();

  byte[] blurredFile = Files.readAllBytes(upload);
  storage.create(blurredBlobInfo, blurredFile);
  logger.info(
      String.format("Blurred image uploaded to: gs://%s/%s", BLURRED_BUCKET_NAME, fileName));

  // Remove images from fileSystem
  Files.delete(download);
  Files.delete(upload);
}
 

public static void downloadObject(
    String projectId, String bucketName, String objectName, Path destFilePath) {
  // The ID of your GCP project
  // String projectId = "your-project-id";

  // The ID of your GCS bucket
  // String bucketName = "your-unique-bucket-name";

  // The ID of your GCS object
  // String objectName = "your-object-name";

  // The path to which the file should be downloaded
  // Path destFilePath = Paths.get("/local/path/to/file.txt");

  Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();

  Blob blob = storage.get(BlobId.of(bucketName, objectName));
  blob.downloadTo(destFilePath);

  System.out.println(
      "Downloaded object "
          + objectName
          + " from bucket name "
          + bucketName
          + " to "
          + destFilePath);
}
 

@Override
public void copyToLocalFile(URI srcUri, File dstFile) throws Exception {
  LOGGER.info("Copy {} to local {}", srcUri, dstFile.getAbsolutePath());
  Blob blob = getBlob(srcUri);
  checkState(existsBlob(blob), "File '%s' does not exists", srcUri);
  blob.downloadTo(dstFile.toPath());
}
 

private void downloadOutputFiles(String prefix) {
  Page<Blob> blobs = storage.list(bucket, BlobListOption.prefix(prefix));
  for (Blob blob : blobs.iterateAll()) {
    blob.downloadTo(Paths.get(tempFolder.getRoot().getPath(), blob.getName()));
  }
}