无法在java中获得套接字权限

Question

private boolean permissionsGranted() {
    final SocketPermission permission = new SocketPermission(
            "239.255.255.250", "connect,accept,resolve");
    try {
        AccessController.checkPermission(permission);
        return true;
    } catch (final AccessControlException e) {
        try {
            e.printStackTrace(new PrintStream("out2.txt"));
        } catch (IOException ex) {
        }
        return false;
    }
}

When running the above code in the Netbeans debug environment the above code returns true

but when complied to a .jar and run by simply double clicking the icon it will return false and I'm at a loss as to why.

I've tried self signing the jar but this did not help.

Answer 1

验证您的计算机是否具有防火墙活动，或者对SO中的执行执行jar权限