Here you can find the source of getLocalHostIp()
public static String getLocalHostIp()
//package com.java2s; /*//from w w w. j a va2s .c o m * Copyright 2015 lixiaobo * * VersionUpgrade project licenses this file to you under the Apache License, * version 2.0 (the "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. */ import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.util.Enumeration; public class Main { public static String getLocalHostIp() { String regex = "[\\d]+.[\\d]+.[\\d]+.[\\d]+"; Enumeration<?> e = null; try { e = NetworkInterface.getNetworkInterfaces(); } catch (SocketException e1) { e1.printStackTrace(); } while (e.hasMoreElements()) { NetworkInterface n = (NetworkInterface) e.nextElement(); Enumeration<?> ee = n.getInetAddresses(); while (ee.hasMoreElements()) { InetAddress i = (InetAddress) ee.nextElement(); String ip = i.getHostAddress(); if (ip.matches(regex) && !ip.equals("127.0.0.1")) { return ip; } } } return null; } }