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Getting the Subject and Issuer Distinguished Names of an X509 Certificate

import java.io.FileInputStream; import java.security.KeyStore; import java.security.Principal; import java.security.cert.X509Certificate; import java.util.Enumeration; public class Main {   public static void main(String[] argv) throws Exception {     FileInputStream is = new FileInputStream("your.keystore");     KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());     keystore.load(is, "my-keystore-password".toCharArray());     Enumeration e = keystore.aliases();     for (; e.hasMoreElements();) {       String alias = (String) e.nextElement();       java.security.cert.Certificate cert = keystore.getCertificate(alias);       if (cert instanceof X509Certificate) {         X509Certificate x509cert = (X509Certificate) cert;         // Get subject         Principal principal = x509cert.getSubjectDN();         String subjectDn = principal.getName();         // Get issuer         principal = x509cert.getIssuerDN();         String issuerDn = principal.getName();       }     }   } }