Dotnet Hex string to Java

Have a problem, much like this post: How to read a .NET Guid into a Java UUID.

Except, from a remote svc I get a hex str formatted like this: ABCDEFGH-IJKL-MNOP-QRST-123456.

I need to match the GUID.ToByteArray() generated .net byte array GH-EF-CD-AB-KL-IJ-OP-MN- QR- ST-12-34-56 in Java for hashing purposes.

I'm kinda at a loss as to how to parse this. Do I cut off the QRST-123456 part and perhaps use something like the Commons IO EndianUtils on the other part, then stitch the 2 arrays back together as well? Seems way too complicated. I can rearrange the string, but I shouldn't have to do any of these. Mr. Google doesn't wanna help me neither..

开发者_Python百科

BTW, what is the logic in Little Endian land that keeps those last 6 char unchanged?

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Yes, for reference, here's what I've done {sorry for 'answer', but had trouble formatting it properly in comment}:

String s = "3C0EA2F3-B3A0-8FB0-23F0-9F36DEAA3F7E";
String[] splitz = s.split("-");
String rebuilt = "";
for (int i = 0; i < 3; i++) { 
  // Split into 2 char chunks. '..' = nbr of chars in chunks 
  String[] parts = splitz[i].split("(?<=\\G..)"); 
  for (int k = parts.length -1; k >=0; k--) {
   rebuilt += parts[k]; 
  } 
 } 
 rebuilt += splitz[3]+splitz[4];

I know, it's hacky, but it'll do for testing.

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Make it into a byte[] and skip the first 3 bytes:

package guid;
import java.util.Arrays;

public class GuidConvert {

    static byte[] convertUuidToBytes(String guid) {
        String hexdigits = guid.replaceAll("-", "");
        byte[] bytes = new byte[hexdigits.length()/2];
        for (int i = 0; i < bytes.length; i++) {
            int x = Integer.parseInt(hexdigits.substring(i*2, (i+1)*2), 16);
            bytes[i] = (byte) x;
        }
        return bytes;
    }

    static String bytesToHexString(byte[] bytes) {
        StringBuilder buf = new StringBuilder();
        for (byte b : bytes) {
            int i = b >= 0 ? b : (int) b + 256;
            buf.append(Integer.toHexString(i / 16));
            buf.append(Integer.toHexString(i % 16));
        }
        return buf.toString();
    }

    public static void main(String[] args) {
        String guid = "3C0EA2F3-B3A0-8FB0-23F0-9F36DEAA3F7E";
        byte[] bytes = convertUuidToBytes(guid);
        System.err.println("GUID  = "+ guid);
        System.err.println("bytes = "+ bytesToHexString(bytes));
        byte[] tail = Arrays.copyOfRange(bytes, 3, bytes.length);
        System.err.println("tail  =       "+ bytesToHexString(tail));
    }
}

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The last group of 6 bytes is not reversed because it is an array of bytes. The first four groups are reversed because they are a four-byte integer followed by three two-byte integers.