Here you can find the source of getLocalIP()
public static String getLocalIP()
//package com.java2s; /* This file is part of Math4J. * Math4J is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version.// w w w . j ava 2 s . c o m * * Math4J is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Math4J; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA * * Copyright 2005 Anthony Magee */ import java.net.InetAddress; import java.net.UnknownHostException; public class Main { public static String getLocalIP() { String localIP = "0.0.0.0"; try { localIP = InetAddress.getLocalHost().getHostAddress(); } catch (UnknownHostException uhe) { System.out.println("IP for the local host could not be found."); uhe.printStackTrace(); } return localIP; } }