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Library of usefull class to be used in any project.
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/*
 * #%L
 * Nuiton Utils
 * 
 * $Id: GZUtil.java 2360 2012-06-11 10:24:36Z tchemit $
 * $HeadURL: http://svn.nuiton.org/svn/nuiton-utils/tags/nuiton-utils-2.6.10/nuiton-utils/src/main/java/org/nuiton/util/GZUtil.java $
 * %%
 * Copyright (C) 2004 - 2010 CodeLutin
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as 
 * published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version.
 * 
 * This program 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public 
 * License along with this program.  If not, see
 * .
 * #L%
 */

/* *
 * GZUtil.java
 *
 * Created: 3 nov. 2004
 *
 * @author Benjamin Poussin 
 * @version $Revision: 2360 $
 *
 * Mise a jour: $Date: 2012-06-11 12:24:36 +0200 (Mon, 11 Jun 2012) $
 * par : */

package org.nuiton.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GZUtil { // GZUtil

    /** Retourne la string decompressee */
    public static StringBuffer bytesToStringBuffer(byte[] in) {
        try {
            if (in == null || in.length == 0) {
                return new StringBuffer("");
            }
            GZIPInputStream gz = new GZIPInputStream(new BufferedInputStream(new ByteArrayInputStream(in)));
            StringBuffer sb = new StringBuffer();
            int c;

            while ((c = gz.read()) != -1) {
                sb.append((char) c);
            }
            gz.close();
            return sb;
        } catch (IOException eee) {
            throw new GZUtilException("Probleme dans la decompression", eee);
        }
    }

    /** Retourne la string decompressee */
    public static String bytesToString(byte[] in) {
        return bytesToStringBuffer(in).toString();
    }

    /** Retourne la string compressee */
    public static byte[] stringBufferToBytes(StringBuffer elem) {
        return stringToBytes(elem.toString());
    }

    /** Retourne la string compressee */
    public static byte[] stringToBytes(String elem) {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            GZIPOutputStream gz = new GZIPOutputStream(new BufferedOutputStream(baos));
            Reader sr = new BufferedReader(new StringReader(elem));
            int c;
            while ((c = sr.read()) != -1) {
                gz.write((char) c);
            }
            gz.close();

            return baos.toByteArray();
        } catch (IOException eee) {
            throw new GZUtilException("Probleme dans la compression", eee);
        }
    }

} // GZUtil