get Last Modified from URL - Java Network

Java examples for Network:URL

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Description

get Last Modified from URL

Demo Code

/*// w w  w  .  jav a  2  s. c om
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
//package com.java2s;
import java.io.InputStream;
import java.io.IOException;
import java.io.File;
import java.net.UnknownServiceException;
import java.net.URL;
import java.net.URLConnection;

public class Main {
    static public long getLastModified(URL url) throws IOException {
        if ("file".equals(url.getProtocol())) {
            String externalForm = url.toExternalForm();
            // Remove the "file:"
            File file = new File(externalForm.substring(5));

            return file.lastModified();
        } else {
            URLConnection connection = url.openConnection();
            long modified = connection.getLastModified();
            try {
                InputStream is = connection.getInputStream();
                if (is != null)
                    is.close();
            }
            // If the connection doesn't support getInputStream(),
            // or there's an IOException (Tomcat throws an exception
            // on directory views, for example), that's OK.
            catch (UnknownServiceException use) {
            } catch (IOException ioe) {
            }

            return modified;
        }
    }
}

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