How to read SSL certificates?

I have several web servers with SSL certificates installed.
My plan is to write a java program which will grab the certs
via ftp, then read (parse) the certificate information.
Ultimately what I want is the expiration date. I found an
example of printing a cert (listed below), but get unresolved
symbol errors when compiling. I thought I needed the Java
Cryptography Extension (JCE), so I downloaded and installed
that, but still get the error. What do I need to do in order
to parse a Verisign certificate, in either .cer or .crt format?

-Thanks


import java.security.c ert.*;
import java.io.*;

public class PrintCert {
public static void main(String args[]) {
try {
FileInputStream fr = new FileInputStream ("sdo.cer");
X509Certificate c = X509Certificate .getInstance(fr );
System.out.prin tln("Read in the following certificate:");
System.out.prin tln("\tCertific ate for: " + c.getSubjectDN( ));
System.out.prin tln("\tCertific ate issued by: " + c.getIssuerDN() );
System.out.prin tln("\tThe certificate is valid from " +
c.getNotBefore( ) + " to " + c.getNotAfter() );
System.out.prin tln("\tCertific ate SN# " + c.getSerialNumb er());
System.out.prin tln("\tGenerate d with " + c.getSigAlgName ());
} catch (Exception e) {
e.printStackTra ce();
}
}
}