import java.io.IOException;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

import javax.swing.SwingUtilities;

public class JarLesen {
    
    public static void readJar(String path) {
        JarFile jFile = null;
        JarEntry jEntry = null;
        Entry<?, ?> entry = null;
        try {
            jFile = new JarFile(path);
            
            Enumeration<JarEntry> jEntries = jFile.entries();
            while(jEntries.hasMoreElements()){
                jEntry = jEntries.nextElement();
                System.out.println(jEntry.getName());
            }
            
            Set<?> set = jFile.getManifest().getMainAttributes().entrySet();
            Iterator<?> it = set.iterator();
            while (it.hasNext()) {
                entry = (Entry<?, ?>) (it.next());
                System.out.println(entry);
                String key = entry.getKey().toString();
                String value = entry.getValue().toString();
                System.out.println("Key: " + key + ", Value: " + value + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String path = "meineJar.jar";
        readJar(path);
    }
}