get IP addresses of computer available on a network? -java

Question

I am making a file sharing application which would look for computers which are running the application on the same network. So I would like my application to discover compu

Answer 1

I found the answer to this question..I looked around and found this code. It is not the best way to do it but it works..

import java.io.IOException;
import java.net.InetAddress;

public class networkPing {

public static void main(String[] args) throws IOException {

    InetAddress localhost = InetAddress.getLocalHost();
    // this code assumes IPv4 is used
    byte[] ip = localhost.getAddress();

    for (int i = 1; i <= 254; i++)
    {
        ip[3] = (byte)i;
        InetAddress address = InetAddress.getByAddress(ip);
    if (address.isReachable(1000))
    {
        System.out.println(address + " machine is turned on and can be pinged");
    }
    else if (!address.getHostAddress().equals(address.getHostName()))
    {
        System.out.println(address + " machine is known in a DNS lookup");
    }

    }

}
}