Java Directory Copy nio copyDirectoryToDirectory(File srcDir, File destDir)

Description

copy Directory To Directory

License

Open Source License

Declaration

public static void copyDirectoryToDirectory(File srcDir, File destDir) throws IOException 

Method Source Code

//package com.java2s;
/**/* w  ww  .j  av  a 2  s  . co  m*/
 * This file is part of VisiCut.
 * Copyright (C) 2011 - 2013 Thomas Oster <thomas.oster@rwth-aachen.de>
 * RWTH Aachen University - 52062 Aachen, Germany
 *
 *     VisiCut is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     VisiCut 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 Lesser General Public License for more details.
 *
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with VisiCut.  If not, see <http://www.gnu.org/licenses/>.
 **/

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

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

import java.nio.channels.FileChannel;

public class Main {
    private static int FILE_COPY_BUFFER_SIZE = 1024 * 1024 * 30;

    public static void copyDirectoryToDirectory(File srcDir, File destDir) throws IOException {
        if (!srcDir.exists() || !srcDir.isDirectory()) {
            throw new IOException("Source dir " + srcDir + " is not a directory.");
        }
        if (destDir.exists() && !destDir.isDirectory()) {
            throw new IOException("Source dir " + destDir + " is not a directory.");
        }
        if (!destDir.exists() && !destDir.mkdirs()) {
            throw new IOException("Can't create " + destDir);
        }
        for (File f : srcDir.listFiles()) {
            if (f.isFile()) {
                copyFileToDirectory(f, destDir);
            } else if (f.isDirectory()) {
                File t = new File(destDir, f.getName());
                copyDirectoryToDirectory(f, t);
            }
        }

    }

    public static void copyFileToDirectory(File srcFile, File destDir) throws IOException {
        if (destDir.exists() && !destDir.isDirectory()) {
            throw new IOException("Destination '" + destDir + "' exists but is a file");
        }
        if (!destDir.exists() && !destDir.mkdirs()) {
            throw new IOException("Can't create directory " + destDir);
        }
        copyFile(srcFile, new File(destDir, srcFile.getName()), false);
    }

    public static void copyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
        if (destFile.exists() && destFile.isDirectory()) {
            throw new IOException("Destination '" + destFile + "' exists but is a directory");
        }

        FileInputStream fis = null;
        FileOutputStream fos = null;
        FileChannel input = null;
        FileChannel output = null;
        try {
            fis = new FileInputStream(srcFile);
            fos = new FileOutputStream(destFile);
            input = fis.getChannel();
            output = fos.getChannel();
            long size = input.size();
            long pos = 0;
            long count = 0;
            while (pos < size) {
                count = size - pos > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : size - pos;
                pos += output.transferFrom(input, pos, count);
            }
        } finally {
            output.close();
            fos.close();
            input.close();
            fis.close();
        }

        if (srcFile.length() != destFile.length()) {
            throw new IOException("Failed to copy full contents from '" + srcFile + "' to '" + destFile + "'");
        }
        if (preserveFileDate) {
            destFile.setLastModified(srcFile.lastModified());
        }
    }
}

Related

1. copyDirectory(final Path source, final Path destination, List excludes)
2. copyDirectory(Path source, ArrayList targets)
3. copyDirectory(String fromPath, String toPath)
4. copyDirectory(String source, String destination)
5. copyDirectoryRecursively(File source, File target)
6. copyDirNIO(File sourceLocation, File targetLocation)