Here you can find the source of isReachableByPing(String host, int port)
public static boolean isReachableByPing(String host, int port)
//package com.java2s; /*/*from w w w . j av a2 s .com*/ * JBoss, Home of Professional Open Source. * See the COPYRIGHT.txt file distributed with this work for information * regarding copyright ownership. Some portions may be licensed * to Red Hat, Inc. under one or more contributor license agreements. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301 USA. */ import java.io.IOException; import java.net.Socket; public class Main { public static boolean isReachableByPing(String host, int port) { Socket ignored = null; try { ignored = new Socket(host, port); ignored.close(); return true; } catch (IOException e) { return false; } // try{ // // nc -zv <hostname/ip> <port/port range> // String cmd = ""; // if(System.getProperty("os.name").startsWith("Windows")) { // // For Windows // cmd = "nc -zv " + host + " " + port; // } else { // // For Linux and OSX // cmd = "nc -zv " + host + " " + port; // } // // Process myProcess = Runtime.getRuntime().exec(cmd); // myProcess.waitFor(); // // if(myProcess.exitValue() == 0) { // // return true; // } // // return false; // // // } catch( Exception e ) { // // e.printStackTrace(); // return false; // } } }