@Nullable
public static String getMainClassName(URL url) throws IOException {
@NotNull URL u = new URL("jar", "", url + "!/");
@NotNull JarURLConnection uc = (JarURLConnection) u.openConnection();
Attributes attr = uc.getMainAttributes();
return (attr != null) ? attr.getValue(Attributes.Name.MAIN_CLASS) : null;
}
/**
* Returns the name of the jar file main class, or null if no "Main-Class" manifest attributes was
* defined.
*/
public String getMainClassName() throws IOException {
URL u = new URL("jar", "", url + "!/");
JarURLConnection uc = (JarURLConnection) u.openConnection();
if (uc.getEntryName() == null) System.out.println("No Entry Name");
else System.out.println(uc.getEntryName());
if (uc == null) System.out.println("Connection is null");
Attributes attr = uc.getMainAttributes();
if (attr != null) System.out.println("Attributes has size: " + attr.size());
// output(attr);
return attr != null ? attr.getValue(Attributes.Name.MAIN_CLASS) : null;
}
