converting between byte arrays and hex encoded strings

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

  public static char[] bytesToHex(byte[] raw) {
    int length = raw.length;
    char[] hex = new char[length * 2];
    for (int i = 0; i < length; i++) {
      int value = (raw[i] + 256) % 256;
      int highIndex = value >> 4;
      int lowIndex = value & 0x0f;
      hex[i * 2 + 0] = kDigits[highIndex];
      hex[i * 2 + 1] = kDigits[lowIndex];
    }
    return hex;
  }

  public static byte[] hexToBytes(char[] hex) {
    int length = hex.length / 2;
    byte[] raw = new byte[length];
    for (int i = 0; i < length; i++) {
      int high = Character.digit(hex[i * 2], 16);
      int low = Character.digit(hex[i * 2 + 1], 16);
      int value = (high << 4) | low;
      if (value > 127)
        value -= 256;
      raw[i] = (byte) value;
    }
    return raw;
  }

  public static byte[] hexToBytes(String hex) {
    return hexToBytes(hex.toCharArray());
  }
}

1.	Convert file in SJIS to UTF8
2.	Return an UTF-8 encoded String
3.	Return an UTF-8 encoded String by length
4.	UTF8 String utilities
5.	Return UTF-8 encoded byte[] representation of a String
6.	Encodes octects (using utf-8) into Hex data
7.	Decodes values of attributes in the DN encoded in hex into a UTF-8 String.
8.	Convert bytes To Hex
9.	Convert hex To Bytes
10.	Unicode 2 ASCII
11.	Make bytes
12.	String converter
13.	Show unicode string
14.	Normalizer
15.	Convert from UTF-8 to Unicode
16.	Convert from Unicode to UTF-8
17.	Utility methods for handling UTF-8 encoded byte streams.
18.	Read Windows Notepad Unicode files
19.	UTF Util
20.	To UTF8 InputStream
21.	Returns {@code true} if the specified character sequence is a valid sequence of UTF-16 char values.
22.	URL UTF8 Encoder

converting between byte arrays and hex encoded strings : UTF8 Byte Hex « Development Class « Java

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