001    /**
002     * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.util;
016    
017    import java.io.IOException;
018    import java.io.InputStream;
019    
020    import java.net.URL;
021    import java.net.URLConnection;
022    
023    /**
024     * @author Shuyang Zhou
025     */
026    public class URLUtil {
027    
028            public static long getLastModifiedTime(URL url) throws IOException {
029                    URLConnection urlConnection = null;
030    
031                    try {
032                            urlConnection = url.openConnection();
033    
034                            return urlConnection.getLastModified();
035                    }
036                    finally {
037                            if (urlConnection != null) {
038                                    try {
039                                            InputStream inputStream = urlConnection.getInputStream();
040    
041                                            inputStream.close();
042                                    }
043                                    catch (IOException ioe) {
044                                    }
045                            }
046                    }
047            }
048    
049    }