匹配Luhn算法：可用于检测银行卡卡号
/**
* http://www.cnblogs.com/JnKindle/p/5798974.html
*
* 匹配Luhn算法：可用于检测银行卡卡号
*
* @param cardNo
* @return
*/
public static boolean matchLuhn(String cardNo) {
int[] cardNoArr = new int[cardNo.length()];
for (int i = 0; i < cardNo.length(); i++) {
cardNoArr[i] = Integer.valueOf(String.valueOf(cardNo.charAt(i)));
}
for (int i = cardNoArr.length - 2; i >= 0; i -= 2) {
cardNoArr[i] <<= 1;
cardNoArr[i] = cardNoArr[i] / 10 + cardNoArr[i] % 10;
}
int sum = 0;
for (int i = 0; i < cardNoArr.length; i++) {
sum += cardNoArr[i];
}
return sum % 10 == 0;
}