JarURLConnection

import java.net.JarURLConnection;
import java.net.URL;
// ja v  a 2 s.co  m
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();

    String entryName = conn.getEntryName();
  }
}