/* * Copyright 2016 Google LLC * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * EDITING INSTRUCTIONS * This file is referenced in READMEs and javadoc. Any change to this file should be reflected in * the project's READMEs and package-info.java. */ package com.google.cloud.examples.storage.snippets; import static java.nio.charset.StandardCharsets.UTF_8; import com.google.cloud.storage.Blob; import com.google.cloud.storage.BlobId; import com.google.cloud.storage.Storage; import com.google.cloud.storage.StorageOptions; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.WritableByteChannel; /** * A snippet for Google Cloud Storage showing how to update the blob's content if the blob exists. */ public class UpdateBlob { public static void main(String... args) throws IOException { Storage storage = StorageOptions.getDefaultInstance().getService(); BlobId blobId = BlobId.of("bucket", "blob_name"); Blob blob = storage.get(blobId); if (blob != null) { byte[] prevContent = blob.getContent(); System.out.println(new String(prevContent, UTF_8)); WritableByteChannel channel = blob.writer(); channel.write(ByteBuffer.wrap("Updated content".getBytes(UTF_8))); channel.close(); } } }