Here you can find the source of getHostName()
public static String getHostName()
//package com.java2s; /*//from w w w . j a v a2s.c o m * Licensed 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.UnknownHostException; public class Main { /** * Gets the host name. * @return the host name */ public static String getHostName() { try { final java.net.InetAddress localMachine = java.net.InetAddress.getLocalHost(); return localMachine.getHostName(); } catch (final UnknownHostException e) { return "localhost"; } } }