[java] java socket question

WORKING code would be much more useful

Anyway, I corrected it with getLocalHost() function - getInetAddress() does not seem to exist - and it worked fine : it returns my local address if I am disconnected and my net address when I am online. So make sure you''re connected when you run it.

import java.net.*;

public class GetAddress
{
    public static void main(String argv[]) throws Exception
    {
        InetAddress host = InetAddress.getLocalHost();
        byte ip[] = host.getAddress();

        for(int i = 0; i < ip.length; i++)
        {
            if(i > 0) System.out.print(".");
            System.out.print(ip[i] & 0xff);
        }
    }
}

sorry, that should be getLocalHost(), i was typing that without compiling first.

anyway, if i use getLocalHost(), i get the problem stated on my first post.

thanks.

It fails even when you are connected ?

That''s weird, since the code I posted works perfectly on my machine. I can''t help you more...

it does not ''fail''...it''s just giving me the 192.168.x.x ip-address instead of the 210.23.x.x

anyone here knows how to get the 210.23.x.x (the one given by whatismyip.com)?

thanks.

The 192.168.nnn.nnn address is, of course, your IP on your LAN. I am by no means an expert on these matters, but I would not be surprised to find that there is no simple means of doing this: You may have to query a website of some sort, or perhaps querying your modem/router (which may be possible; look up its documentation).

If you know the ISP''s DHCP server IP adress you can probably work it out via that.

InetAddress.getLocalHost() will obviously return the address of the localhost, which is your LAN address.

When you have multiple addresses you must use NetworkInterface (JDK 1.4) to choose one of them.

import java.net.*;
import java.util.Enumeration;


public class GetAllAddresses
{

	public static void main(String[] argv) throws Exception
	{
		Enumeration interfaces = NetworkInterface.getNetworkInterfaces();

		while(interfaces.hasMoreElements())
		{
			NetworkInterface i = (NetworkInterface) interfaces.nextElement();
			Enumeration addresses = i.getInetAddresses();

			System.out.print(i.getName() + " : ");

			while(addresses.hasMoreElements())
			{
				InetAddress a = (InetAddress) addresses.nextElement();
				System.out.print(a.getHostName() + " " + a.getHostAddress());
			}

			System.out.println();
		}
	}

}
 

[edited by - overnhet on March 27, 2004 1:49:23 PM]

yeah, it''s the IP on the LAN.

i tried running the NetworkInterface by overnhet, but it returns only the localhost and the IP on the LAN (the 192.X.X.X)...not the ip-address i get at whatismyip.com (which is 210.X.X.X)...

the code should run anywhere, so i don''t think knowing an ISP''s DHCP will work either...

thanks for the help so far guys, but am still stuck...