Convert a byte[] array to readable string format. - Java java.lang

Java examples for java.lang:byte Array Convert

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Description

Convert a byte[] array to readable string format.

Demo Code

/*//from  w w w  .j  av  a 2  s  .c  o  m
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        byte[] in = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        System.out.println(byteArrayToHexString(in));
    }

    private static final char[] CHARS = { '0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

    /**
     * Convert a byte[] array to readable string format. This makes the "hex" readable!
     * 
     * @return result String buffer in String format
     * @param in
     *            byte[] buffer to convert to string format
     */
    public static String byteArrayToHexString(byte[] in) {
        byte ch = 0x00;

        if (in == null || in.length <= 0) {
            return null;
        }

        StringBuffer out = new StringBuffer(in.length * 2);

        //CheckStyle:MagicNumber OFF
        for (int i = 0; i < in.length; i++) {
            ch = (byte) (in[i] & 0xF0); // Strip off high nibble
            ch = (byte) (ch >>> 4); // shift the bits down
            ch = (byte) (ch & 0x0F); // must do this is high order bit is on!

            out.append(CHARS[(int) ch]); // convert the nibble to a String Character
            ch = (byte) (in[i] & 0x0F); // Strip off low nibble
            out.append(CHARS[(int) ch]); // convert the nibble to a String Character
        }
        //CheckStyle:MagicNumber ON

        return out.toString();
    }
}

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