16进制 两位两位转换

1：读取IC卡为16进制 两位两位转换

public static String reverse(String number) {
String result = “”;
if (!StringUtils.isBlank(number)) {
int length = number.length();
if (length > 1 && length % 2 == 0) {
for (int i = 0; i < length; i++) {
if (i % 2 == 0) {
result += number.charAt(length - i - 2);
} else {
result += number.charAt(length - i);
}
}
}
}
return result;
}

4940C7BD 转换后—》BDC74049

2： 16进制字符串转为10进制数

	String hexString = "BDC74049";
    BigInteger big = new BigInteger(hexString, 16);
    // 3183951945
    System.out.println(big.toString(10));