Java FileChannel Copy copyFile(File in, File out)

Description

copy File

License

Open Source License

Declaration

public static void copyFile(File in, File out) throws IOException 

Method Source Code

//package com.java2s;
/*//from w  ww.j a v  a 2  s  .co m
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.
 * 
 * The contents of this file are subject to the terms of the GNU General Public License Version 3
 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each file.
 */

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 final int CHANNEL_MAX_COUNT = Math.min(64 * 1024 * 1024 - 32 * 1024, Integer.MAX_VALUE);

    public static void copyFile(File in, File out) throws IOException {
        copyFile(in, out, CHANNEL_MAX_COUNT);
    }

    /**
     * Copy a file. It is generally not advised to use 0 for <code>maxCount</code> since various
     * implementations have size limitations, see {@link #copyFile(File, File)}.
     * 
     * @param in the source file.
     * @param out the destination file.
     * @param maxCount the number of bytes to copy at a time, 0 meaning size of <code>in</code>.
     * @throws IOException if an error occurs.
     */
    public static void copyFile(File in, File out, long maxCount) throws IOException {
        final FileInputStream sourceIn = new FileInputStream(in);
        FileOutputStream sourceOut = null;
        try {
            sourceOut = new FileOutputStream(out);
            final FileChannel sourceChannel = sourceIn.getChannel();
            final long size = sourceChannel.size();
            if (maxCount == 0)
                maxCount = size;
            final FileChannel destinationChannel = sourceOut.getChannel();
            long position = 0;
            while (position < size) {
                position += sourceChannel.transferTo(position, maxCount, destinationChannel);
            }
        } finally {
            sourceIn.close();
            if (sourceOut != null)
                sourceOut.close();
        }
    }

    public static void copyFile(File in, File out, final boolean useTime) throws IOException {
        if (!useTime || in.lastModified() != out.lastModified()) {
            copyFile(in, out);
            if (useTime)
                out.setLastModified(in.lastModified());
        }
    }
}

Related

1. copyFile(File in, File out)
2. copyFile(File in, File out)
3. copyFile(File in, File out)
4. copyFile(File in, File out)
5. copyFile(File in, File out)
6. copyFile(File in, File out)
7. copyFile(File in, File out)
8. copyfile(File infile, File outfile)
9. copyFile(File inFile, File outFile)