Get a hexadecimal representation of a byte array starting at offset index for len bytes, with each octet separated by a space. - Java java.lang

Java examples for java.lang:byte Array to hex

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Description

Get a hexadecimal representation of a byte array starting at offset index for len bytes, with each octet separated by a space.

Demo Code

/*//from  w ww.jav  a  2  s . com
 * Copyright 2010-2012 sshj contributors
 *
 * Licensed 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.
 *
 * This file may incorporate work covered by the following copyright and
 * permission notice:
 *
 *     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
 *
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 *      specific language governing permissions and limitations
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 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        byte[] array = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        int offset = 2;
        int len = 2;
        System.out.println(printHex(array, offset, len));
    }

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

    /**
     * Get a hexadecimal representation of a byte array starting at <code>offset</code> index for <code>len</code>
     * bytes, with each octet separated by a space.
     *
     * @param array
     * @param offset
     * @param len
     *
     * @return hex string, each octet delimited by a space
     */
    public static String printHex(byte[] array, int offset, int len) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < len; i++) {
            byte b = array[offset + i];
            if (sb.length() > 0)
                sb.append(' ');
            sb.append(digits[b >> 4 & 0x0F]);
            sb.append(digits[b & 0x0F]);
        }
        return sb.toString();
    }
}

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