Java tutorial
import java.net.JarURLConnection; import java.net.URL; import java.security.cert.Certificate; import java.util.jar.Attributes; public class Main { public static void main(String[] argv) throws Exception { URL url = new URL("jar:file:/c://my.jar!/"); JarURLConnection conn = (JarURLConnection) url.openConnection(); Attributes attrs = conn.getAttributes(); Certificate[] certs = conn.getCertificates(); } }