Java十六进制字符串转byte和字符转字节

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    //十六进制字符串转字节数组    public static byte[] fromHexStringToBytes(String hexString) {        if ((hexString == null) || (hexString.equals("")) || hexString.length()%2 != 0){            return null;        }else{            hexString = hexString.toUpperCase();            int length = hexString.length()/2;            char[] bytec = hexString.toCharArray();            byte[] bit = new byte[length];            for (int i = 0; i < length; i++){                int p = 2 * i;                //两个十六进制字符转换成1个字节，第1个字符转换成byte后左移4位，然后和第2个字符的byte做或运算                bit[i] = (byte) (fromCharToByte(bytec[p]) << 4 | fromCharToByte(bytec[p + 1]));            }            return bit;        }    }    //字符转换为字节    private static byte fromCharToByte(char c) {        return (byte) "0123456789ABCDEF".indexOf(c);    }

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