Java Byte Array to Hex String bytesToHexString(final byte[] bytes)

Description

Converts the specified bytes array into its hex string representation.

License

Apache License

Parameter

Parameter	Description
bytes	a parameter

Return

null

Declaration

public static String bytesToHexString(final byte[] bytes) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    /**/*from ww  w.j  a v  a2s  . c  o  m*/
    * Converts the specified bytes array into its hex string representation.
    *
    * @param bytes
    * @return null
    */
    public static String bytesToHexString(final byte[] bytes) {
        if (bytes == null)
            return null;

        char[] chars = new char[bytes.length * 2];
        for (int byteIndex = 0, charIndex = 0; byteIndex < bytes.length; ++byteIndex, charIndex += 2) {
            String str = Integer.toString(bytes[byteIndex] + 128, 16);
            str = ensureLength(str, 2, false, '0');
            chars[charIndex] = str.charAt(0);
            chars[charIndex + 1] = str.charAt(1);
        }
        return new String(chars);
    }

    /**
     * Add chars if str's length not enougth
     * @param str The string
     * @param minLength the min length
     * @param appendToRight append to right
     * @param appendChar the appended char
     * @return the string with length >= minLength
     */
    public static String ensureLength(String str, int minLength, boolean appendToRight, char appendChar) {
        if (str == null)
            str = "null";
        else if (appendToRight) {
            str = str + createString(Math.max(minLength, str.length()) - str.length(), appendChar);
        } else {
            str = createString(Math.max(minLength, str.length()) - str.length(), appendChar) + str;
        }
        return str;
    }

    /**
     * Generate the String that has chr character duplicated num number of times
     * @param num The number of character
     * @param chr The character to be duplicated
     * @return the String that has chr character duplicated num number of times
     */
    public static String createString(int num, char chr) {
        char[] chs = new char[num];
        for (int i = 0; i < chs.length; i++) {
            chs[i] = chr;
        }
        return new String(chs);
    }
}

Related

1. bytesToHexString(byte[] in, int length)
2. bytesToHexString(byte[] input)
3. bytesToHexString(byte[] mpi)
4. bytesToHexString(byte[] src)
5. bytesToHexString(byte[] src)
6. bytesToHexString(final byte[] bytes)
7. bytesToHexString(final byte[] bytes)
8. bytesToHexString(final byte[] bytes)
9. bytesToHexString(final byte[] bytes)