Java16进制字符串转byte数组

比如字符串

String s = "eb73984c4950dd8c546e9fc1cb0c1";

    public static byte[] hexTobytes(String hex) {
        if (hex == null || hex.length() == 0) {
            return null;
        }

        char[] hexChars = hex.toCharArray();
        byte[] bytes = new byte[hexChars.length / 2];   // 如果 hex 中的字符不是偶数个, 则忽略最后一个

        for (int i = 0; i < bytes.length; i++) {
            bytes[i] = (byte) Integer.parseInt("" + hexChars[i * 2] + hexChars[i * 2 + 1], 16);
        }

        return bytes;
    }

    public static void main(String[] args) {
        String s = "eb73984c4950dd8c546e9fc1cb0c";
        int len = s.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
                    + Character.digit(s.charAt(i+1), 16));
        }
        System.out.println(data);
    }