1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.any23.util; 19 20 import java.io.IOException; 21 import java.net.MalformedURLException; 22 import java.net.URL; 23 import java.net.URLConnection; 24 25 /** 26 * Contains general utility functions for handling URLs. 27 * 28 * @author Michele Mostarda (mostarda@fbk.eu) 29 */ 30 public class URLUtils { 31 32 /** 33 * Verifies if the specified URL is reachable online. 34 * 35 * @param url 36 * input URL. 37 * 38 * @return <code>true</code> if the resource can be accessed, <code>false</code> otherwise. 39 * 40 * @throws MalformedURLException 41 * if <code>url</code> is malformed. 42 */ 43 public static boolean isOnline(String url) throws MalformedURLException { 44 try { 45 final URLConnection connection = new URL(url).openConnection(); 46 connection.getInputStream().close(); 47 return true; 48 } catch (IOException ioe) { 49 if (ioe instanceof MalformedURLException) { 50 throw (MalformedURLException) ioe; 51 } 52 return false; 53 } 54 } 55 56 private URLUtils() { 57 } 58 59 }