I don't know if this is what everyone is asking for, but basically,
credit cards are a "mod-10" format, and the expiration date
(called "expiry" in credit card parlance) cannot be > 10 years from the
current date. Since I can't remember where I pulled this from off the
net, I'll include it here.
Hope this helps....
=======================================================================
public boolean card_number_ok(String card_number)
throws IOException {
int last_digit,
position,
digit,
iBeg, iEnd,
weight = 2,
sum = 0;
String cLast;
boolean bRetCode = false; // default is NOT OK
if (card_number.length() == 0)
return false;
// compute the numerical value of the last digit
cLast = card_number.substring(card_number.length()-1,
card_number.length());
last_digit = Integer.parseInt(cLast);
// go through the number starting at the 'tens' place and perform the
mod 10 weighting
for (position=card_number.length()-2; position >= 0; position--) {
// weigh current digit. Note: convert ascii code to the digit it
represents
char cc = card_number.charAt(position);
digit = weight * (cc - '0');
// add the digit if less than 10 to the sum, otherwise add the sum
of the digits if greater than or equal to 10
sum = sum + (digit / 10) + (digit % 10);
// alternately weight digits by a factors of 2 and 1
if (weight == 2)
weight = 1;
else
weight = 2;
} // end FOR ()
// is the last digit the same as the computed check? */
if (last_digit == ((10 - sum % 10) % 10))
bRetCode= true; // yes, valid card number
return bRetCode;
}
public boolean badCardExpiryDate(int month, int year) {
int CC_VALID_Y_RANGE=10; // No card lasts this many years!
Calendar newtime = Calendar.getInstance();
java.util.Date ltime;
long gmtime;
long curr_month, curr_year;
ltime = newtime.getTime();
if(year < 100) {
if(year < 70)
year += 2000;
else
year += 1900;
}
// Convert to coordinated universal time: */
gmtime = newtime.getTime().getTime();
if (gmtime == 0)
return true; // The current time is less than Jan 1, 1970!
curr_year = newtime.get(newtime.YEAR);// 0 means 1900 for gmtime()
curr_month = newtime.get(newtime.MONTH) + 1; // 0 means Jan for
gmtime()
boolean bReturn = true;
if((month <1 || month>12)
|| (year < curr_year)
|| (year == curr_year && month < curr_month)
|| (year > (curr_year + CC_VALID_Y_RANGE))
|| (year == (curr_year + CC_VALID_Y_RANGE) && month > curr_month))
bReturn = false;
return bReturn;
}
-----Original Message-----
From: A mailing list for discussion about Sun Microsystem's Java Servlet
API Technology. [mailto:[EMAIL PROTECTED]]On Behalf Of
Vanitha Radhakrishnan
Sent: Wednesday, December 29, 1999 11:16 AM
To: [EMAIL PROTECTED]
Subject: Re: [Re: credit card validation servlet]
Dmitry,
Iam also working on an application which requires
the same. If possible, please do mail it to me.
Thanks,
Vanitha
--- Mahesh Patil <[EMAIL PROTECTED]> wrote:
> If possible, please send me the same.
> Mahesh
>
> sachin rameshrao zingade <[EMAIL PROTECTED]>
> wrote:
>
> > ---------------------------------------------
> > Attachment:
> > MIME Type: multipart/alternative
> > ---------------------------------------------
> RE: credit card validation servletif possible please
> send the same to me
>
> Sachin
> ----- Original Message -----
> From: Srinivas_Kondamudi
> To: [EMAIL PROTECTED]
> Sent: Thursday, December 09, 1999 11:12 AM
> Subject: Re: credit card validation servlet
>
>
> I am also working on an application that requires
> credit card validation.
> I am also interested in the same. Please send the
> servlet code to me also.
>
> Thanks in advance
>
> srinivas
>
> -----Original Message-----
> From: Rogatkin, Dmitry M
> [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, December 09, 1999 5:57 AM
> To: [EMAIL PROTECTED]
> Subject: Re: credit card validation servlet
>
> We have such part in the code of our servlet. If
> you are interested in, I
> can send this part to you.
>
> Dmitry.
> ----- Original Message -----
> From: "Sameer Tyagi" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, December 08, 1999 7:41 AM
> Subject: credit card validation servlet
>
>
>
> > Hi,
> > Does anyone know of any Java class /servlet that
> does basic credit card
> > number validations ?
> >
> > -Sam
> >
> >
>
>
___________________________________________________________________________
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