Java FileChannel Copy copyFile(File srcFile, File destFile, boolean preserveFileDate)

Description

Copies a file to a new location.

License

Open Source License

Parameter

Parameter	Description
srcFile	an existing file to copy, must not be <code>null</code>
destFile	the new file, must not be <code>null</code>
preserveFileDate	true if the file date of the copy should be the same as the original

Exception

Parameter	Description
NullPointerException	if source or destination is <code>null</code>
IOException	if an IO error occurs during copying

Declaration

public static void copyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException 

Method Source Code

//package com.java2s;
/*//w  w  w  . jav a  2 s.c o  m
 * $Id$
 * --------------------------------------------------------------------------------------
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 *
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */

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

import java.io.IOException;

import java.nio.channels.Channel;
import java.nio.channels.FileChannel;

public class Main {
    /**
     * Copies a file to a new location.
     * <p>
     * This method copies the contents of the specified source file to the specified
     * destination file. The directory holding the destination file is created if it
     * does not exist. If the destination file exists, then this method will
     * overwrite it.
     * 
     * @param srcFile an existing file to copy, must not be <code>null</code>
     * @param destFile the new file, must not be <code>null</code>
     * @param preserveFileDate true if the file date of the copy should be the same
     *            as the original
     * @throws NullPointerException if source or destination is <code>null</code>
     * @throws IOException if source or destination is invalid
     * @throws IOException if an IO error occurs during copying
     * @see #copyFileToDirectory(File, File, boolean)
     */
    public static void copyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
        if (srcFile == null) {
            throw new NullPointerException("Source must not be null");
        }
        if (destFile == null) {
            throw new NullPointerException("Destination must not be null");
        }
        if (srcFile.exists() == false) {
            throw new FileNotFoundException("Source '" + srcFile + "' does not exist");
        }
        if (srcFile.isDirectory()) {
            throw new IOException("Source '" + srcFile + "' exists but is a directory");
        }
        if (srcFile.getCanonicalPath().equals(destFile.getCanonicalPath())) {
            throw new IOException("Source '" + srcFile + "' and destination '" + destFile + "' are the same");
        }
        if (destFile.getParentFile() != null && destFile.getParentFile().exists() == false) {
            if (destFile.getParentFile().mkdirs() == false) {
                throw new IOException("Destination '" + destFile + "' directory cannot be created");
            }
        }
        if (destFile.exists() && destFile.canWrite() == false) {
            throw new IOException("Destination '" + destFile + "' exists but is read-only");
        }
        doCopyFile(srcFile, destFile, preserveFileDate);
    }

    /**
     * Internal copy file method.
     * 
     * @param srcFile the validated source file, must not be <code>null</code>
     * @param destFile the validated destination file, must not be <code>null</code>
     * @param preserveFileDate whether to preserve the file date
     * @throws IOException if an error occurs
     */
    private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
        if (destFile.exists() && destFile.isDirectory()) {
            throw new IOException("Destination '" + destFile + "' exists but is a directory");
        }

        FileChannel input = new FileInputStream(srcFile).getChannel();
        try {
            FileChannel output = new FileOutputStream(destFile).getChannel();
            try {
                output.transferFrom(input, 0, input.size());
            } finally {
                closeQuietly(output);
            }
        } finally {
            closeQuietly(input);
        }

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

    /**
     * Unconditionally close a <code>Channel</code>.
     * <p>
     * Equivalent to {@link Channel#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     * 
     * @param channel the Channel to close, may be null or already closed
     */
    public static void closeQuietly(Channel channel) {
        try {
            if (channel != null) {
                channel.close();
            }
        } catch (IOException ioe) {
            // ignore
        }
    }
}

Related

1. copyFile(File src, File dst)
2. copyFile(File src, File dst)
3. copyFile(File src, File target)
4. copyFile(File src, File target)
5. copyFile(File srcFile, File destFile, boolean preserveFileDate)
6. copyFile(File srcFile, File destFile, boolean preserveFileDate)
7. copyFile(File srcFile, File dstFile, boolean overwrite)
8. copyFile(FileChannel in, FileChannel out)
9. copyFile(FileInputStream fromFile, FileOutputStream toFile)