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

Description

copy Directory

License

Open Source License

Declaration

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

Method Source Code


//package com.java2s;
/*//www . j  a  va  2s.  co  m
 * Hello Minecraft!.
 * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see {http://www.gnu.org/licenses/}.
 */

import java.io.File;
import java.io.FileFilter;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void copyDirectory(File srcDir, File destDir) throws IOException {
        copyDirectory(srcDir, destDir, null);
    }

    public static void copyDirectory(File srcDir, File destDir, FileFilter filter) throws IOException {
        if (srcDir == null)
            throw new NullPointerException("Source must not be null");
        if (destDir == null)
            throw new NullPointerException("Destination must not be null");
        if (!srcDir.exists())
            throw new FileNotFoundException("Source '" + srcDir + "' does not exist");
        if (!srcDir.isDirectory())
            throw new IOException("Source '" + srcDir + "' exists but is not a directory");
        if (srcDir.getCanonicalPath().equals(destDir.getCanonicalPath()))
            throw new IOException("Source '" + srcDir + "' and destination '" + destDir + "' are the same");

        List exclusionList = null;
        if (destDir.getCanonicalPath().startsWith(srcDir.getCanonicalPath())) {
            File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
            if ((srcFiles != null) && (srcFiles.length > 0)) {
                exclusionList = new ArrayList(srcFiles.length);
                for (File srcFile : srcFiles) {
                    File copiedFile = new File(destDir, srcFile.getName());
                    exclusionList.add(copiedFile.getCanonicalPath());
                }
            }
        }
        doCopyDirectory(srcDir, destDir, filter, exclusionList);
    }

    public static String getName(String filename) {
        if (filename == null)
            return null;
        int index = indexOfLastSeparator(filename);
        return filename.substring(index + 1);
    }

    private static void doCopyDirectory(File srcDir, File destDir, FileFilter filter, List<String> exclusionList)
            throws IOException {
        File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
        if (srcFiles == null)
            throw new IOException("Failed to list contents of " + srcDir);
        if (destDir.exists()) {
            if (!destDir.isDirectory())
                throw new IOException("Destination '" + destDir + "' exists but is not a directory");
        } else if ((!destDir.mkdirs()) && (!destDir.isDirectory()))
            throw new IOException("Destination '" + destDir + "' directory cannot be created");

        if (!destDir.canWrite())
            throw new IOException("Destination '" + destDir + "' cannot be written to");
        for (File srcFile : srcFiles) {
            File dstFile = new File(destDir, srcFile.getName());
            if ((exclusionList == null) || (!exclusionList.contains(srcFile.getCanonicalPath())))
                if (srcFile.isDirectory())
                    doCopyDirectory(srcFile, dstFile, filter, exclusionList);
                else
                    doCopyFile(srcFile, dstFile);
        }
        destDir.setLastModified(srcDir.lastModified());
    }

    public static int indexOfLastSeparator(String filename) {
        if (filename == null)
            return -1;
        int lastUnixPos = filename.lastIndexOf(47);
        int lastWindowsPos = filename.lastIndexOf(92);
        return Math.max(lastUnixPos, lastWindowsPos);
    }

    public static void doCopyFile(File srcFile, File destFile) throws IOException {
        Files.copy(srcFile.toPath(), destFile.toPath(), StandardCopyOption.COPY_ATTRIBUTES,
                StandardCopyOption.REPLACE_EXISTING);
    }
}

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

Description

License

Declaration

Method Source Code

Related