Thread: How to read the X509 certificate in java

The X509 certificate is the digital certificate. Here is the sample code to read the X509 certificate

Code:

public class PrintCRT {
	public static void main(String args[]) {
		try {
			FileInputStream fr = new FileInputStream("X509.cer");
			CertificateFactory cf = 						
					   CertificateFactory.getInstance("X509");
			X509Certificate crt = (X509Certificate) 
								cf.generateCertificate(fr);
		System.out.println("Read certificate:");
			System.out.println("\tCertificate for: " +
									 crt.getSubjectDN());
			System.out.println("\tCertificate issued by: " +
									 crt.getIssuerDN());
			System.out.println("\tCertificate is valid from " +
						crt.getNotBefore() + " to " + c.getNotAfter());
			System.out.println("\tCertificate SN# " +
									 crt.getSerialNumber());
			System.out.println("\tGenerated with " +
									 crt.getSigAlgName());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}