Java URL Copy copyRemoteFile(URL url, File localFile)

Description

copy Remote File

License

Open Source License

Declaration

private static void copyRemoteFile(URL url, File localFile)
            throws IOException 

Method Source Code

//package com.java2s;
/*/*from   w  ww  . jav a  2s  .  c  om*/
 * Copyright (C) 2004 Sun Microsystems, Inc. All rights reserved. Use is
 * subject to license terms.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the Lesser GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 */

import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.DataOutputStream;
import java.io.DataInputStream;

import java.io.FileOutputStream;
import java.io.IOException;

import java.net.URL;

public class Main {
    private static void copyRemoteFile(URL url, File localFile)
            throws IOException {
        if (url == null || localFile == null)
            return;

        if (url.getFile() == "" || url.getFile() == null)
            return;

        if (localFile.isDirectory()) {
            localFile = new File(localFile.getPath() + File.separator
                    + url.getFile());
        }

        if (!localFile.exists()) {
            createLocalFile(localFile);
        }

        DataInputStream inStream = new DataInputStream(url.openStream());
        DataOutputStream outStream = new DataOutputStream(
                new FileOutputStream(localFile));

        copyStream(inStream, outStream);
    }

    private static void createLocalFile(File localFile) throws IOException {
        if (localFile == null)
            return;

        if (!localFile.getParentFile().exists()) {
            try {
                if (!localFile.getParentFile().mkdirs()) {
                    throw new IOException("Cannot make parent directory "
                            + "when trying to create local file");
                }
            } catch (Exception e) {
                throw new IOException("Cannot make parent directory when "
                        + "trying to create local file: " + e.getMessage());
            }
        }

        if (localFile.exists()) {
            try {
                if (!localFile.delete()) {
                    throw new IOException(
                            "Cannot delete original file when "
                                    + "trying to create local file");
                }
            } catch (Exception e) {
                throw new IOException("Cannot delete original file when "
                        + "trying to create local file: " + e.getMessage());
            }
        }

        try {
            if (!localFile.createNewFile()) {
                throw new IOException("Cannot create new local file");
            }
        } catch (Exception e) {
            throw new IOException("Cannot create new local file: "
                    + e.getMessage());
        }
    }

    private static void copyStream(InputStream inStream,
            OutputStream outStream) throws IOException {
        int readbytes = 0;

        try {
            do {
                byte[] buffer = new byte[512];
                readbytes = inStream.read(buffer, 0, 512);
                if (readbytes <= 0) {
                    break;
                }

                outStream.write(buffer, 0, readbytes);
                outStream.flush();
            } while (true);
        } catch (IOException ioE) {
            ioE.printStackTrace();
        } finally {
            if (inStream != null) {
                inStream.close();
            }
            if (outStream != null) {
                outStream.close();
            }
        }
    }
}

Related

1. copy(URL in, File out)
2. copy(URL source, String destination)
3. copy_url_to_file(String url, String filename)
4. copyFile(URL url, String destFilePath)
5. copyFromURL(final String query, final File target)
6. copyResource(URL from, File to)
7. copyResource(URL resource, File destination)
8. copyUrlBinaryFile(String fileName, String sourceUrlPath, String destPath)
9. copyURLToFile(final URL source, final File destination)