Storage storage;
String bucketName = "bucket";
String blobName = "gtest";
String GOOGLE_CREDENTIALS_SCOPE = "https://www.googleapis.com/auth/cloud-platform";
String APPLICATION_TYPE = "application/octet-stream";
String googleCredentialsJson = null;

ArrayList al = new ArrayList();
al.add(GOOGLE_CREDENTIALS_SCOPE);
String s = String.format("\r\n--__END_OF_PART__--\r\n01234");

googleCredentialsJson = new String ( Files.readAllBytes( Paths.get("google.json") ) );
GoogleCredentials credentials = GoogleCredentials.fromStream(new ByteArrayInputStream(googleCredentialsJson.getBytes()))
                .createScoped(al);
storage = StorageOptions.newBuilder().setCredentials(credentials).build().getService();

BlobId blobId = BlobId.of(bucketName, blobName);
BlobInfo blobInfo = BlobInfo.newBuilder(blobId).setContentType(APPLICATION_TYPE).build();

storage.create(blobInfo, s.getBytes());