Java Byte Array to Hex bytesToHex(byte[] bytes)

Description

bytes To Hex

License

Apache License

Declaration

public static String bytesToHex(byte[] bytes) 

Method Source Code

//package com.java2s;
/*/*from ww  w  .  j a v a2s.  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.
 */

public class Main {
    private static final char[] hexArray = "0123456789ABCDEF".toCharArray();

    public static String bytesToHex(byte[] bytes) {
        char[] hexChars = new char[bytes.length * 2];
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = hexArray[v >>> 4];
            hexChars[j * 2 + 1] = hexArray[v & 0x0F];
        }
        return new String(hexChars);
    }

    public static String bytesToHex(byte[] bytes, int groupSize) {
        if (bytes == null) {
            return "NULL";
        }

        if (bytes.length == 0) {
            return "[]";
        }

        char[] hexChars = new char[bytes.length * 2
                + numberOfGroups(bytes, groupSize)];
        int outPos = 0;
        for (int j = 0; j < bytes.length; j++) {
            if (j > 0 && j % groupSize == 0) {
                hexChars[outPos++] = ' ';
            }
            int v = bytes[j] & 0xFF;
            hexChars[outPos++] = hexArray[v >>> 4];
            hexChars[outPos++] = hexArray[v & 0x0F];
        }
        return new String(hexChars);
    }

    private static int numberOfGroups(byte[] bytes, int groupSize) {
        int groups = bytes.length / groupSize;

        if (bytes.length % groupSize == 0) {
            groups--;
        }

        return groups;
    }
}

Related

1. bytesToHex(byte[] bytes)
2. bytesToHex(byte[] bytes)
3. bytesToHex(byte[] bytes)
4. bytesToHex(byte[] bytes)
5. bytesToHex(byte[] bytes)
6. bytesToHex(byte[] bytes)
7. bytesToHex(byte[] bytes)
8. bytesToHex(byte[] bytes)
9. bytesToHex(byte[] bytes)