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public static X509Certificate getCert(String fileName) throws Exception {//´ÓÒ»¸öÓÐЧµÄÖ¤ÊéÎļþÀ´´´½¨Ö¤Êé..
InputStream inStream = new FileInputStream(fileName);
CertificateFactory cf = CertificateFactory.getInstance("X.509");//ÓÃÖ¤Ê鹤³§À´´´½¨Ö¤Êé..
X509Certificate cert = (X509Certificate)cf.generateCertificate(inStream);
inStream.close();
return cert;
}
public static void showCert( X509Certificate cert ) {//Êä³öÖ¤ÊéµÄ¸÷ÏîÐÅÏ¢..
System.out.println("Version: " + cert.getVersion());//Ö¤Êé°æ±¾..
System.out.println("SerialNumber: " + cert.getSerialNumber().toString(16) );//Ö¤ÊéÐòÁкÅ..
System.out.println("SignatureAlgorithm: " + cert.getSigAlgName());//Ö¤ÊéÇ©ÃûËã·¨..
X500Principal principal = cert.getIssuerX500Principal();
System.out.println("IssuerName: \n" + principal.getName(X500Principal.RFC1779));//Ö¤Êé°ä·¢Õß
//System.out.println(principal.hashCode());
GregorianCalendar gcal = new GregorianCalendar();
System.out.print("Validityfrom: ");
gcal.setTime(cert.getNotBefore());//Ö¤ÊéÓÐЧÆÚ´Ó..
System.out.println(gcal.get(GregorianCalendar.YEAR)+"/"+gcal.get(GregorianCalendar.MONTH)+"/"+gcal.get(GregorianCalendar.DAY_OF_MONTH)+" "+gcal.get(GregorianCalendar.HOUR_OF_DAY)+":"+gcal.get(GregorianCalendar.MINUTE)+":"+gcal.get(GregorianCalendar.SECOND));
System.out.print("ValidityTo: ");
gcal.setTime(cert.getNotAfter());//Ö¤ÊéÓÐЧÆÚµ½..
System.out.println(gcal.get(GregorianCalendar.YEAR)+"/"+gcal.get(GregorianCalendar.MONTH)+"/"+gcal.get(GregorianCalendar.DAY_OF_MONTH)+" "+gcal.get(GregorianCalendar.HOUR_OF_DAY)+":"+gcal.get(GregorianCalendar.MINUTE)+":"+gcal.get(GregorianCalendar.SECOND));
principal = cert.getSubjectX500Principal();
System.out.println("SubjectName: \n" + principal.getName(X500Principal.RFC1779));//Ö¤ÊéʹÓÃÕß
PublicKey pkey = cert.getPublicKey();//»ñµÃ¹«Ô¿
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