JAVA Converting Hexadecimal String

Question

In Python, I can convert hex to something like this..

s = "6025ce2069c61b15d8314f7cdd76b850dcd339547335d0e4a1e0b9915b0230cd"

s.decode('hex')
'`%\xce i\xc6\x1b\x15\xd81O|\xddv\xb8P\xdc\xd39Ts5\xd0\xe4\xa1\xe0\xb9\x91[\x020\xcd'

My question is how to do the same thing in Java?

I did this in Java like this but it raises an exception.

new String(Hex.decodeHex(str.toCharArray()), "UTF-8"

The error messege is like this.

Exception in thread "main" org.apache.commons.codec.DecoderException: Odd number of characters.

========================================================

I removed UTF-8 but I am still getting the same exception.. please help!

new String(Hex.decodeHex(combined.toCharArray()))

Exception in thread "main" org.apache.commons.codec.DecoderException: Odd number of characters.

The hex data you have there is not UTF-8 data. The Python code never tries to interpret the bytes as a text encoding, all you have is bytes still. — Martijn Pieters
– Martijn Pieters, Commented Apr 27, 2016 at 12:11
Please checkout the answer in this question: stackoverflow.com/questions/10143135/hex-string-to-image — AKS
– AKS, Commented Apr 27, 2016 at 12:19

Ankur Singhal · Accepted Answer · 2016-04-27 12:15:37Z

3

This works for me

public static void main(String[] args) throws ParseException, DecoderException, UnsupportedEncodingException {
        String hexString = "6025ce2069c61b15d8314f7cdd76b850dcd339547335d0e4a1e0b9915b0230cd";
        byte[] bytes = Hex.decodeHex(hexString.toCharArray());
        System.out.println(new String(bytes , "UTF-8"));
    }

Output

`%? i??1O|?v?P??9Ts5???[0?

answered Apr 27, 2016 at 12:15

Ankur Singhal

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3 Comments

Martijn Pieters Over a year ago

Conclusion: the OP doesn't have the data in hexString that they think they have.

Ankur Singhal Over a year ago

@MartijnPieters hexString.matches("-?[0-9a-fA-F]+") return true, refer this

Martijn Pieters Over a year ago

What does that have to do with the fact that the OP does not have an even number of hex digits in their input? And allowing a - at the start will only make matters worse, not better.

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