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copied!<p>I wrote the method below which seems to be working fine.</p> <pre><code>public static void zipFiles(final GcsFilename targetZipFile, final GcsFilename... filesToZip) throws IOException { Preconditions.checkArgument(targetZipFile != null); Preconditions.checkArgument(filesToZip != null); Preconditions.checkArgument(filesToZip.length > 0); final int fetchSize = 4 * 1024 * 1024; final int readSize = 2 * 1024 * 1024; GcsOutputChannel outputChannel = null; ZipOutputStream zip = null; try { GcsFileOptions options = new GcsFileOptions.Builder().mimeType(MediaType.ZIP.toString()).build(); outputChannel = GCS_SERVICE.createOrReplace(targetZipFile, options); zip = new ZipOutputStream(Channels.newOutputStream(outputChannel)); GcsInputChannel readChannel = null; for (GcsFilename file : filesToZip) { try { final GcsFileMetadata meta = GCS_SERVICE.getMetadata(file); if (meta == null) { LOGGER.warning(file.toString() + " NOT FOUND. Skipping."); continue; } //int fileSize = (int) meta.getLength(); // LOGGER.fine("adding " + file.toString()); ZipEntry entry = new ZipEntry(file.getObjectName()); zip.putNextEntry(entry); readChannel = GCS_SERVICE.openPrefetchingReadChannel(file, 0, fetchSize); final ByteBuffer buffer = ByteBuffer.allocate(readSize); int bytesRead = 0; while (bytesRead >= 0) { bytesRead = readChannel.read(buffer); buffer.flip(); zip.write(buffer.array(), buffer.position(), buffer.limit()); buffer.rewind(); buffer.limit(buffer.capacity()); } } finally { zip.closeEntry(); readChannel.close(); } } } finally { zip.flush(); zip.close(); outputChannel.close(); } } </code></pre>

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