Java FileChannel Copy copyRec(File src, File dst)

Description

Copies a directory or a file from source to destination.

License

Open Source License

Parameter

Parameter	Description
src	source.
dst	destination.

Exception

Parameter	Description

Declaration

public static void copyRec(File src, File dst) throws IOException 

Method Source Code

//package com.java2s;
// the terms of the GNU General Public License as published by the Free Software Foundation;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

public class Main {
    /**//from   w w w .j  a  v  a2 s. co  m
     * Copies a directory or a file from source to destination.
     *
     * @param src   source.
     * @param dst   destination.
     *
     * @throws java.io.IOException in case of I/O error.
     */
    public static void copyRec(File src, File dst) throws IOException {
        if (src == null || dst == null)
            return;
        if (dst.isFile())
            return;

        if (src.isFile()) {
            // Copy file
            copyFileToDir(src, dst);
        } else {
            // Construct destination directory file
            String name = src.getName();
            File newDst = new File(dst, name);

            if (!newDst.exists()) {
                // Create the destination directory if it doesn't exist yet
                newDst.mkdir();
            } else if (newDst.isFile()) {
                throw new IOException("There's a file " + newDst.getName() + " in place of directory");
            }

            // Copy files and directories from the source to a new destination recursively
            for (File file : src.listFiles())
                copyRec(file, newDst);
        }
    }

    /**
     * Copies file from it's location to destination dir.
     *
     * @param file      file to copy.
     * @param destDir   dir.
     *
     * @throws java.io.IOException if I/O error happens.
     */
    public static void copyFileToDir(File file, File destDir) throws IOException {
        String name = file.getName();
        String filename = destDir.getAbsolutePath() + File.separator + name;

        File destFile = new File(filename);
        destFile.createNewFile();

        copyFileToFile(file, destFile);
    }

    /**
     * Copies one file to another.
     *
     * @param source    source file.
     * @param dest      destination file.
     *
     * @throws java.io.IOException if I/O error happens.
     */
    public static void copyFileToFile(File source, File dest) throws IOException {
        FileChannel sourceChannel = null;
        FileChannel targetChannel = null;

        try {
            sourceChannel = new FileInputStream(source).getChannel();
            targetChannel = new FileOutputStream(dest).getChannel();
            sourceChannel.transferTo(0, sourceChannel.size(), targetChannel);
            targetChannel.force(true);
        } finally {
            if (sourceChannel != null)
                sourceChannel.close();
            if (targetChannel != null)
                targetChannel.close();
        }
    }
}

Related

1. copyFolder(File fin, File fout)
2. copyFromZip(ZipFile zipFile, String locationInBundle, File destination)
3. copyInternal(FileInputStream in, FileOutputStream out)
4. copyLarge(FileInputStream in, FileOutputStream out)
5. copyNio(final File source_file, final File destination_file)
6. copyStream(InputStream in, long length, File out)
7. copyStreamToFile(InputStream inStream, File file)
8. copyThrowsOnException(final File source, final File destination)
9. copyTo(File srcFile, File destFile)