十六进制转二进制

    /**
     * 将16进制转换为二进制
     *
     * @param hexString
     * @return
     */
    public static String hexString2binaryString(String hexString) {
        //16进制转10进制
        BigInteger sint = new BigInteger(hexString, 16);
        //10进制转2进制
        String result = sint.toString(2);
        //字符串反转
        return new StringBuilder(result).reverse().toString();
    }