Here you can find the source of getIpAddress()
public static String getIpAddress()
//package com.java2s; /*//www . j a v a 2 s . c o m * Copyright (c) 2012, the Dart project authors. * * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html * * 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.UnknownHostException; public class Main { /** * @return the user's IP address, if available (null otherwise) */ public static String getIpAddress() { try { return InetAddress.getLocalHost().getHostAddress(); } catch (UnknownHostException e) { return null; } } }