我需要做一个信用卡号验证。
当我上网搜索时,我发现 org.apache.commons.validator.CreditCardValidator
. 但似乎它不能正常工作,当我传递一个非数字字符时,它也提供了true。
Apache的代码 信用卡验证器(CreditCardValidator):
String ccNumber = "378282246310005";
CreditCardValidator creditCardValidator = new CreditCardValidator();
if(!creditCardValidator.isValid(ccNumber)) throw new Exception("Credit Card Number is not a valid one!");
然后,我写了以下方法来根据卡的类型和卡号来验证信用卡号码(使用luhn的算法)。
CardType验证器(如果是无效的卡类型,则为空)。
public String getCCType(String ccNumber){
String visaRegex = "^4[0-9]{12}(?:[0-9]{3})?$";
String masterRegex = "^5[1-5][0-9]{14}$";
String amexRegex = "^3[47][0-9]{13}$";
String dinersClubrRegex = "^3(?:0[0-5]|[68][0-9])[0-9]{11}$";
String discoverRegex = "^6(?:011|5[0-9]{2})[0-9]{12}$";
String jcbRegex = "^(?:2131|1800|35\\d{3})\\d{11}$";
String commonRegex = "^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\\d{3})\\d{11})$";
try {
ccNumber = ccNumber.replaceAll("\\D", "");
return (ccNumber.matches(visaRegex) ? "VISA" : ccNumber.matches(masterRegex) ? "MASTER" :ccNumber.matches(amexRegex) ? "AMEX" :ccNumber.matches(dinersClubrRegex) ? "DINER" :ccNumber.matches(discoverRegex) ? "DISCOVER" :ccNumber.matches(jcbRegex) ? "JCB":null);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
使用Luhn算法的CardNumber验证器。
public boolean isValidCardNumber(String ccNumber){
try {
ccNumber = ccNumber.replaceAll("\\D", "");
char[] ccNumberArry = ccNumber.toCharArray();
int checkSum = 0;
for(int i = ccNumberArry.length - 1; i >= 0; i--){
char ccDigit = ccNumberArry[i];
if((ccNumberArry.length - i) % 2 == 0){
int doubleddDigit = Character.getNumericValue(ccDigit) * 2;
checkSum += (doubleddDigit % 9 == 0 && doubleddDigit != 0) ? 9 : doubleddDigit % 9;
}else{
checkSum += Character.getNumericValue(ccDigit);
}
}
return (checkSum != 0 && checkSum % 10 == 0);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
我想知道。
参考资料。如何根据卡号检测信用卡类型?
你可以在这里找到自定义植入的信用卡验证器,它同时进行信用卡号码验证和信用卡类型检测。
我很早以前就做过这个,抱歉代码是C语言,容易转换。希望能帮到你。
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
int CardNoChecker(unsigned long long int Number)
{
int dijts=0;
int Ans=0;
{
unsigned long long int k=1;
while(Number%k!=Number)
{
dijts=dijts+1;
k=k*10;
}
}
{
int i=1;
int Product=0;
int Sum=0;
for(i=dijts;i>=1;i--)
{
if(i%2==0)
{
if((Number%10)*2<10)
Product = Product + ( Number % 10 ) * 2 ;
else
{
int No=(Number%10)*2;
Product = Product + No/10;
Product = Product + No%10;
}
}
else
{
Sum = Sum + ( Number % 10 ) ;
}
Number=Number /10;
}
Ans = Sum + Product ;
}
if(Ans%10==0)
return (1);
else
return (0);
}
int main()
{
unsigned long long int CardNO;
int valid=0;
while(!valid)
{
int CnV=0;
int VC=0;
int AE=0;
int MC=0;
printf("Enter Card NO : ");
scanf("%llu",&CardNO);
if(CardNO/1000000000000==4 || CardNO/1000000000000000==4)
{
VC=1;
}
else if(CardNO/10000000000000==34 ||CardNO/10000000000000==37)
{
AE=1;
}
else if(CardNO/100000000000000==51 || CardNO/100000000000000==52 || CardNO/100000000000000==53 || CardNO/100000000000000==54 || CardNO/100000000000000==55)
{
MC=1;
}
CnV=CardNoChecker(CardNO);
if(CnV && MC )
printf("This is a Valid Master Card\n\n");
else if(CnV && VC )
printf("This is a Valid Visa Card\n\n");
else if(CnV && AE )
printf("This is a Valid American Express Card\n\n");
else
printf("Card is Not Valid'\n\n");
}
return (0);
}
请看一下Luhn算法https:/en.wikipedia.orgwikiLuhn_algorithm。
public static void main(String[] args) {
boolean isValid = checkCC("4561 2612 1234 5467");
System.out.println(isValid);
}
private static boolean checkCC(String input) {
String purportedCC = input.replaceAll(" ", "");
int sum = 0;
for (int i = 0; i < purportedCC.length(); i++) {
int cardNum = Integer.parseInt(
Character.toString(purportedCC.charAt(i)));
if ((purportedCC.length() - i) % 2 == 0) {
cardNum = cardNum * 2;
if (cardNum > 9) {
cardNum = cardNum - 9;
}
}
sum += cardNum;
}
return sum % 10 == 0;
}