Converts a byte array into an hex string. - Java java.lang

Java examples for java.lang:String Hex

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Description

Converts a byte array into an hex string.

Demo Code

/**/*from   ww w.  j a  v a2s.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) {
        byte[] data = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        System.out.println(byteArrayToBinHex(data));
    }

    /**
     * Converts a byte array into an hex string.
     */
    public static String byteArrayToBinHex(byte[] data) {
        return byteArrayToHexString(data, "");
    }

    /**
     * Converts a byte array into an hex string. Octets are divided by divider.
     */
    public static String byteArrayToHexString(byte[] data, String divider) {
        String result = "";
        if (data == null) {
            return result;
        }
        for (int i = 0; i < data.length; i++) {
            result += i > 0 ? divider : "";
            int value = data[i] & 0xFF;
            result += intToHexString(value, 2);
        }
        return result.toUpperCase();
    }

    /** Converts a value to a hex string with a fixed number of digits. */
    public static String intToHexString(int value, int digits) {
        String result = Integer.toHexString(value);
        for (int i = result.length(); i < digits; i++) {
            result = "0" + result;
        }
        // trim result if needed
        if (result.length() > digits) {
            return result.substring(result.length() - digits);
        }
        return result;
    }
}

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