UrlHelper.java

/**
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, Version 3, 29 June 2007;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.gnu.org/licenses/lgpl-3.0.txt
 *
 * 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.
 */
/**
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, Version 3, 29 June 2007;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 	http://www.gnu.org/licenses/lgpl-3.0.txt
 *
 * 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 org.kevoree.tools.war.wrapperplugin;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

/**
 * Created by IntelliJ IDEA.
 * User: duke
 * Date: 16/12/11
 * Time: 15:24
 * To change this template use File | Settings | File Templates.
 */
public class UrlHelper {

    public static String getFile(String host, File output) {
        InputStream input = null;
        FileOutputStream writeFile = null;
        String fileName = null;

        try {
            URL url = new URL(host);
            URLConnection connection = url.openConnection();
            int fileLength = connection.getContentLength();

            if (fileLength == -1) {
                System.out.println("Invalide URL or file.");
                return fileName;
            }

            input = connection.getInputStream();
            fileName = url.getFile().substring(url.getFile().lastIndexOf('/') + 1);

            if (!output.exists()) {
                ZipHelper.createParentDirs(output);
                output.createNewFile();
            }

            writeFile = new FileOutputStream(output);
            byte[] buffer = new byte[1024];
            int read;

            while ((read = input.read(buffer)) > 0)
                writeFile.write(buffer, 0, read);
            writeFile.flush();
        } catch (IOException e) {
            System.out.println("Error while trying to download the file.");
            e.printStackTrace();
        } finally {
            try {
                writeFile.close();
                input.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return fileName;
    }

}