public String bytesToHexString(byte[] b)
    {
        final char [] chars = new char[]
            {'0','1','2','3','4','5','6','7','8','9', 'A','B','C','D','E','F'};

        if ((b == null) || (b.length == 0)) {
            throw new IllegalArgumentException("argument null or zero length");
        }
        StringBuffer buff = new StringBuffer(b.length * 2);

        for (int i = 0; i < b.length; i++ ) {
            buff.insert(i*2,chars[(b[i] >> 4) & 0xf]);
            buff.insert(i*2+1,chars[b[i] & 0xf]);
        }

        return buff.toString();
    }

Bytes to hex string

convert

Java