Creates a string from an UTF-8 encoded string. - Java java.lang

Java examples for java.lang:String UTF

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Description

Creates a string from an UTF-8 encoded string.

Demo Code

/**/*from ww w. ja  va2 s.c  om*/
 * 
 * Copyright (C) 2004-2008 FhG Fokus
 *
 * This file is part of the FhG Fokus UPnP stack - an open source UPnP implementation
 * with some additional features
 *
 * You can redistribute the FhG Fokus UPnP stack and/or modify it
 * under the terms of the GNU General Public License Version 3 as published by
 * the Free Software Foundation.
 *
 * For a license to use the FhG Fokus UPnP stack software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact Fraunhofer FOKUS by e-mail at the following
 * addresses:
 *   upnpstack@fokus.fraunhofer.de
 *
 * The FhG Fokus UPnP stack 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 this program; if not, see <http://www.gnu.org/licenses/>
 * or write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */
 
//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String dataString = "java2s.com";
        System.out.println(decodeUTF8String(dataString));
    }

    /**
     * Creates a string from an UTF-8 encoded string.
     * 
     * @param dataString
     *          A string that is UTF-8 encoded but is treated as 8859-1
     * 
     * @return
     */
    public static String decodeUTF8String(String dataString) {
        if (dataString == null) {
            return null;
        }
        if (dataString.length() == 0) {
            return "";
        }

        byte[] utf8ByteArray = stringToByteArray(dataString);

        return byteArrayToUTF8String(utf8ByteArray);
    }

    /** Converts a string to a byte array */
    public static byte[] stringToByteArray(String dataString) {
        if (dataString == null) {
            return null;
        }

        byte[] result = new byte[dataString.length()];
        for (int i = 0; i < dataString.length(); i++) {
            result[i] = (byte) dataString.charAt(i);
        }

        return result;
    }

    /** Creates an UTF-8 string from a byte array. */
    public static String byteArrayToUTF8String(byte[] data) {
        if (data == null) {
            return null;
        }
        if (data.length == 0) {
            return "";
        }

        byte[] source = data;
        // remove final '\0'
        if (data[data.length - 1] == (byte) 0) {
            source = new byte[data.length - 1];
            System.arraycopy(data, 0, source, 0, source.length);
        }
        try {
            return new String(source, "utf-8");
        } catch (Exception ex) {
        }
        return null;
    }
}

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