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Groups > comp.lang.java.programmer > #24483

Re: convert byte array to hex string using BigInteger

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On 6/20/2013 8:03 AM, Laura Schmidt wrote:
> Hi,
>
> I try to convert a byte array to a hex string like this:
>
>   private static String hex_encode (byte [] val)
>   {
>    BigInteger b = new BigInteger(val);
>
>    String t = b.toString(16);
>
>    return (t);
>   }
>
> For a long byte array it returns a "negative" hex string, i. e. starting
> with a "-" sign.
>
> But I want just the bytes in the array converted to hex representation,
> each one ranging from "00" to "FF". There should be no minus sign then.
>
> Can you help?

	// Untested:
	private static String hexEncode(byte[] val) {
	    StringBuilder buff = new StringBuilder(2 * val.length);
	    for (byte b : val) {
	        buff.append("0123456789ABCDEF".charAt((b >> 4) & 0xF));
	        buff.append("0123456789ABCDEF".charAt(b & 0xF));
	    }
	    return buff.toString();
	}

There are other ways, too.

-- 
Eric Sosman
esosman@comcast-dot-net.invalid

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Thread

convert byte array to hex string using BigInteger Laura Schmidt <ls@mailinator.com> - 2013-06-20 14:03 +0200
  Re: convert byte array to hex string using BigInteger Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-06-20 09:03 -0400
  Re: convert byte array to hex string using BigInteger rossum <rossum48@coldmail.com> - 2013-06-20 14:09 +0100
    Re: convert byte array to hex string using BigInteger Laura Schmidt <ls@mailinator.com> - 2013-06-20 15:32 +0200
      Re: convert byte array to hex string using BigInteger rossum <rossum48@coldmail.com> - 2013-06-20 15:44 +0100
      Re: convert byte array to hex string using BigInteger lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-20 19:22 +0100
        Re: convert byte array to hex string using BigInteger markspace <markspace@nospam.nospam> - 2013-06-20 11:56 -0700
          Re: convert byte array to hex string using BigInteger lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-20 20:43 +0100
        Re: convert byte array to hex string using BigInteger Lew <lewbloch@gmail.com> - 2013-06-20 13:39 -0700
          Re: convert byte array to hex string using BigInteger lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-21 08:17 +0100
        Re: convert byte array to hex string using BigInteger Arne Vajhøj <arne@vajhoej.dk> - 2013-06-26 22:16 -0400
  Re: convert byte array to hex string using BigInteger Joerg Meier <joergmmeier@arcor.de> - 2013-06-20 22:09 +0200
  Re: convert byte array to hex string using BigInteger Roedy Green <see_website@mindprod.com.invalid> - 2013-06-21 14:51 -0700
    Re: convert byte array to hex string using BigInteger Joerg Meier <joergmmeier@arcor.de> - 2013-06-22 00:26 +0200
      Re: convert byte array to hex string using BigInteger Roedy Green <see_website@mindprod.com.invalid> - 2013-06-23 08:49 -0700
        Re: convert byte array to hex string using BigInteger Joerg Meier <joergmmeier@arcor.de> - 2013-06-23 22:37 +0200
      Re: convert byte array to hex string using BigInteger Roedy Green <see_website@mindprod.com.invalid> - 2013-06-23 12:40 -0700
        Re: convert byte array to hex string using BigInteger Joerg Meier <joergmmeier@arcor.de> - 2013-06-23 22:41 +0200
  Re: convert byte array to hex string using BigInteger Arne Vajhøj <arne@vajhoej.dk> - 2013-06-26 22:12 -0400
    Re: convert byte array to hex string using BigInteger Arne Vajhøj <arne@vajhoej.dk> - 2013-06-26 22:20 -0400
    Re: convert byte array to hex string using BigInteger Laura Schmidt <ls@mailinator.com> - 2013-06-28 07:55 +0200
      Re: convert byte array to hex string using BigInteger Joerg Meier <joergmmeier@arcor.de> - 2013-06-29 00:01 +0200
    Re: convert byte array to hex string using BigInteger Stanimir Stamenkov <s7an10@netscape.net> - 2013-06-29 19:10 +0300
      Re: convert byte array to hex string using BigInteger Arne Vajhøj <arne@vajhoej.dk> - 2013-07-03 22:24 -0400
  Re: convert byte array to hex string using BigInteger aydin.k.abadi@gmail.com - 2013-11-23 16:40 -0800
  Re: convert byte array to hex string using BigInteger aydin.k.abadi@gmail.com - 2013-11-23 16:43 -0800
    Re: convert byte array to hex string using BigInteger Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2013-11-24 10:43 +0000

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