-
- public static boolean checkBankCard(String bankCard) {
- if(bankCard.length() < 15 || bankCard.length() > 19) {
- return false;
- }
- char bit = getBankCardCheckCode(bankCard.substring(0, bankCard.length() - 1));
- if(bit == 'N'){
- return false;
- }
- return bankCard.charAt(bankCard.length() - 1) == bit;
- }
-
-
- public static char getBankCardCheckCode(String nonCheckCodeBankCard){
- if(nonCheckCodeBankCard == null || nonCheckCodeBankCard.trim().length() == 0
- || !nonCheckCodeBankCard.matches("\\d+")) {
-
- return 'N';
- }
- char[] chs = nonCheckCodeBankCard.trim().toCharArray();
- int luhmSum = 0;
- for(int i = chs.length - 1, j = 0; i >= 0; i--, j++) {
- int k = chs[i] - '0';
- if(j % 2 == 0) {
- k *= 2;
- k = k / 10 + k % 10;
- }
- luhmSum += k;
- }
- return (luhmSum % 10 == 0) ? '0' : (char)((10 - luhmSum % 10) + '0');
- }
posted @
2017-11-02 17:15
kim_liu
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