Java Folder Copy nio copyFolder(final File from, final File to)

Description

copy a full folder recursively

License

Open Source License

Parameter

Parameter	Description
from	a parameter
to	a parameter

Exception

Parameter	Description
IOException	an exception

Declaration

public static void copyFolder(final File from, final File to) throws IOException 

Method Source Code

//package com.java2s;
/* /*w w  w. ja v a  2 s .  c o  m*/
 * The MIT License
 *
 * Copyright 2016 Benny Lutati.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.io.File;
import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;
import java.io.InputStream;

import java.io.OutputStream;

import java.nio.channels.FileChannel;

public class Main {
    /**
     * copy a full folder recursively
     * @param from
     * @param to
     * @throws IOException 
     */
    public static void copyFolder(final File from, final File to) throws IOException {
        assert !to.exists() || to.isDirectory();

        if (!to.exists()) {
            to.mkdirs();
        }

        if (!from.isDirectory()) {
            copy(from.getAbsolutePath(), new File(to, from.getName()).getAbsolutePath());
        } else {
            final File newDestDir = new File(to, from.getName());
            if (!newDestDir.exists() && !newDestDir.mkdir()) {
                throw new IOException("cannot write folder " + newDestDir.getAbsolutePath());
            }
            for (final File child : from.listFiles()) {
                copyFolder(child, newDestDir);
            }
        }
    }

    public static void copy(String source, String destination) throws IOException {
        File s = new File(source);
        File d = new File(destination);

        FileInputStream ss = new FileInputStream(s);
        FileOutputStream ds = new FileOutputStream(d);

        FileChannel sourceFileChannel = ss.getChannel();
        FileChannel destinationFileChannel = ds.getChannel();

        long size = sourceFileChannel.size();
        sourceFileChannel.transferTo(0, size, destinationFileChannel);
    }

    public static void copy(File from, File to) throws IOException {
        if (from.exists()) {
            byte[] all = new byte[32768];
            int read = -1;
            InputStream is = new FileInputStream(from);
            OutputStream os = new FileOutputStream(to);

            while ((read = is.read(all)) > 0) {
                os.write(all, 0, read);
            }

            is.close();
            os.close();
        }
    }
}

Related

1. copyFolder(File sourceFolder, File destinationFolder)
2. copyFolder(File sourceFolder, File destinationFolder, List blacklist)
3. copyFolder(File src, File dest)
4. copyFolder(File src, File dest)
5. copyFolder(File src, File dst, FilenameFilter filter)
6. copyFolder(String path, String resultPath)
7. copyFolderNio(String oldpathall, String newpath)
8. copyFolders(File sourceFolder, File destFolder)