Java Directory Copy nio copyDirectory(File sourceDir, File destinationDir)

Description

Copies the contents of one directory into the other.

License

Apache License

Parameter

Parameter	Description
sourceDir	The source directory.
destinationDir	The destination directory.

Declaration

public static void copyDirectory(File sourceDir, File destinationDir) 

Method Source Code

//package com.java2s;
/*/*from   www  .j a v  a2 s  . c om*/
 * Copyright 2012 BMW Car IT GmbH
 *
 * Licensed 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.
 */

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

import java.nio.channels.FileChannel;

public class Main {
    /**
     * Copies the contents of one directory into the other. Will not change modified flags of files.
     * 
     * @param sourceDir
     *            The source directory.
     * @param destinationDir
     *            The destination directory.
     */
    public static void copyDirectory(File sourceDir, File destinationDir) {
        if (sourceDir == null || !sourceDir.exists() || destinationDir == null) {
            return;
        }
        destinationDir.mkdirs();
        File[] files = sourceDir.listFiles();
        if (files == null) {
            files = new File[0];
        }
        for (File sourceFile : files) {
            if (sourceFile.isDirectory()) {
                // recursive copy of directories
                File newDestSubDir = new File(destinationDir, sourceFile.getName());
                newDestSubDir.mkdirs();
                newDestSubDir.setLastModified(sourceFile.lastModified());
                copyDirectory(sourceFile, newDestSubDir);
            } else {
                // copy file
                File destFile = new File(destinationDir, sourceFile.getName());
                copyFile(sourceFile, destFile);
                destFile.setLastModified(sourceFile.lastModified()); // don't change modified flag!
            }
        }
    }

    private static void copyFile(File sourceFile, File destFile) {
        try {
            FileInputStream source = new FileInputStream(sourceFile);
            FileOutputStream destination = new FileOutputStream(destFile);

            FileChannel sourceFileChannel = source.getChannel();
            FileChannel destinationFileChannel = destination.getChannel();
            sourceFileChannel.transferTo(0, sourceFileChannel.size(), destinationFileChannel);

            source.close();
            destination.close();
        } catch (Exception ex) {
            throw new IllegalArgumentException(ex);
        }
    }
}

Related

1. copyDirectory(File source, File destination)
2. copyDirectory(File source, File destination)
3. copyDirectory(File source, File destination)
4. copyDirectory(File source, File destination, boolean recursive)
5. copyDirectory(File source, File target, boolean acceptFileInUseError)
6. copyDirectory(File sourceDir, File targetDir)
7. copyDirectory(File sourceDirectory, File targetDirectory)
8. copyDirectory(File sourceFile, File destFile)
9. copyDirectory(File src, File dest)