Hex Decode Encode using apache commons code - Java Algorithm

Java examples for Algorithm:String

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Description

Hex Decode Encode using apache commons code

Demo Code




import java.io.UnsupportedEncodingException;
import java.util.Scanner;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;

public class HexDecodeReencode
{

  public static void main(final String[] args)
    throws UnsupportedEncodingException
  {/*from w  w  w  . ja va 2  s.  c o  m*/
    System.out.println("Enter hex encoded strings.");
    try (Scanner in = new Scanner(System.in);)
    {
      while (true)
      {
        try
        {
          final String hexEncoded = in.next();
          System.out.println("Hex encoded string: " + hexEncoded);

          final byte[] decodeHex = Hex.decodeHex(hexEncoded.toCharArray());
          final String bytesAsString = new String(decodeHex, "ISO-8859-1");
          System.out.println(String.format("Decoded to %d bytes: ~%s~",
                                           decodeHex.length,
                                           bytesAsString));

          final String hexReencoded = Hex.encodeHexString(decodeHex);
          System.out.println("Hex re-encoded: " + hexReencoded.toUpperCase());
        }
        catch (final DecoderException e)
        {
          e.printStackTrace();
        }
      }
    }
  }

}

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