How to get the LAN IP of a client using Java?

Question

How can i get the LAN IP-address of a computer using Java? I want the IP-address which is connected to the router and the rest of the network.

I\'ve tried something like

Answer 1

This is a method I've used for a while. It includes a little hack to figure out the externally visible ip-address as well.

private List getLocalHostAddresses() {

    List addresses = new ArrayList();

    try {
        Enumeration e = NetworkInterface.getNetworkInterfaces();

        while (e.hasMoreElements()) {
            NetworkInterface ni = e.nextElement();
            Enumeration e2 = ni.getInetAddresses();
            while (e2.hasMoreElements())
                addresses.add(e2.nextElement().getHostAddress());
        }
        URL u = new URL("http://whatismyip.org");
        BufferedReader in = new BufferedReader(new InputStreamReader(
                u.openStream()));
        addresses.add(in.readLine());
        in.close();
    } catch (Exception ignore) {
    }

    return addresses;
}