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    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  }