package com.epam.wilma.test.server.compress.gzip; /*========================================================================== Copyright 2013-2017 EPAM Systems This file is part of Wilma. Wilma is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Wilma is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Wilma. If not, see <http://www.gnu.org/licenses/>. ===========================================================================*/ import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.zip.GZIPOutputStream; import org.apache.commons.io.IOUtils; import com.epam.wilma.test.server.SystemException; /** * Responsible for compressing an input stream into gzip. * @author Tamas_Bihari * */ public class GzipCompressor { /** * Compresses an {@link InputStream} object into gzip. * @param source the input stream that will be compressed. * @return a {@link ByteArrayOutputStream} containing gzipped byte array. */ public ByteArrayOutputStream compress(final InputStream source) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); try { GZIPOutputStream gout = new GZIPOutputStream(baos); //... Code to read from your original uncompressed data and write to gout. IOUtils.copy(source, gout); gout.finish(); gout.close(); } catch (IOException e) { throw new SystemException("error", e); } return baos; } }