Here you can find the source of isValidURL(String url)
public static boolean isValidURL(String url)
//package com.java2s; /*//from ww w . j a v a 2 s. com * Copyright (c) 2004-2013 Universidade do Porto - Faculdade de Engenharia * Laborat?rio de Sistemas e Tecnologia Subaqu?tica (LSTS) * All rights reserved. * Rua Dr. Roberto Frias s/n, sala I203, 4200-465 Porto, Portugal * * This file is part of Neptus, Command and Control Framework. * * Commercial Licence Usage * Licencees holding valid commercial Neptus licences may use this file * in accordance with the commercial licence agreement provided with the * Software or, alternatively, in accordance with the terms contained in a * written agreement between you and Universidade do Porto. For licensing * terms, conditions, and further information contact lsts@fe.up.pt. * * European Union Public Licence - EUPL v.1.1 Usage * Alternatively, this file may be used under the terms of the EUPL, * Version 1.1 only (the "Licence"), appearing in the file LICENCE.md * included in the packaging of this file. You may not use this work * except in compliance with the Licence. Unless required by applicable * law or agreed to in writing, software distributed under the Licence is * distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF * ANY KIND, either express or implied. See the Licence for the specific * language governing permissions and limitations at * https://www.lsts.pt/neptus/licence. * * For more information please see <http://lsts.fe.up.pt/neptus>. * * Author: * 20??/??/?? */ import java.net.HttpURLConnection; import java.net.URL; public class Main { public static boolean isValidURL(String url) { try { HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection(); conn.setConnectTimeout(3000); conn.connect(); conn.disconnect(); return conn.getResponseCode() >= 200 && conn.getResponseCode() < 300; } catch (Exception e) { e.printStackTrace(); return false; } } }