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

public class GetLocalIP {
	
	public static String getLocalIP() throws Exception {
		NetworkInterface localInf = null;
		InetAddress localAddr = null;
		Enumeration<NetworkInterface> infs = NetworkInterface.getNetworkInterfaces();
		while (infs.hasMoreElements()) {
    		NetworkInterface inf = infs.nextElement();
    		Enumeration<InetAddress> addresses = inf.getInetAddresses();
			while (addresses.hasMoreElements()) {
				InetAddress addr = addresses.nextElement();
				if (addr instanceof Inet4Address) {
					if (inf.getName().startsWith("tunl"))
						continue;
					if (addr.isLoopbackAddress())
						continue;
					if (addr.isSiteLocalAddress()) {
						System.out.println(String.format("interface %s ip is %s", inf.getName(), addr.getHostAddress()));
						return addr.getHostAddress();
					}
					localInf = inf;
					localAddr = addr;
				}
			}
		}
		if (localInf != null) {
			System.out.println(String.format("interface %s ip is %s", localInf.getName(), localAddr.getHostAddress()));
			return localAddr.getHostAddress();
		} else {
			System.out.println("get local ip failed");
			return null;
		}
	}
	
	public static void main( String[] args ) throws Exception {
		getLocalIP();
	}
}