Работа с файлами и папками

 
    private static void recurseIt(File fromDir, File toDir, boolean overwrite) throws IOException, FileNotFoundException {
        System.out.println("Copy directory content from [" + fromDir.getCanonicalPath() + "] to [" + toDir.getCanonicalPath()
                + "]");
        if (fromDir.isDirectory()) {
            File[] files = fromDir.listFiles();
            for (int i = 0; i < files.length; i++) {
                File destFile = new File(toDir.getCanonicalPath() + File.separator + files[i].getName());
                System.out.println("Copying [" + files[i].getCanonicalPath() + "] to [" + destFile.getCanonicalPath() + "]");
                // Source file is a file
                if (files[i].isFile()) {
                    if (destFile.exists() && overwrite) destFile.delete();
                    if (!destFile.exists()) {
                        if (!destFile.createNewFile()) throw new IllegalStateException("Destination file ["
                                + destFile.getCanonicalPath() + "] could not be created!");
                        copyFile(files[i], destFile);
                    } else {
                        System.out.println("File [" + destFile.getCanonicalPath() + "," + destFile.length()
                                + "B ] already exists!");
                    }
                } else {
                    // Source file is a directory
                    if (!destFile.exists()) {
                        System.out.println("Creating destination directory [" + destFile.getCanonicalPath() + "]");
                        if (!destFile.mkdirs()) throw new IllegalStateException("Destination directory ["
                                + destFile.getCanonicalPath() + "] could not be created!");
                    }
                    recurseIt(files[i], destFile, overwrite);
                }
            }
        }
    }

    private static void copyFile(File from, File to) throws FileNotFoundException, IOException {
        BufferedInputStream in = new BufferedInputStream(new FileInputStream(from));
        BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(to));
        int read;
        byte[] buffer = new byte[1024];
        try {
            while ((read = in.read(buffer)) != -1) {
                out.write(buffer, 0, read);
            }
        } finally {
            out.flush();
            in.close();
            out.close();
        }
    }

    public static void copyDir(File fromDir, File toDir, boolean overwrite) throws IOException, FileNotFoundException {
        // Perform some validation
        if (!fromDir.exists() || !fromDir.canRead()) throw new IllegalArgumentException("Directory ["
                + fromDir.getCanonicalPath() + "] does not exists or cannot be read!");
        if (!toDir.exists()) if (!toDir.mkdirs()) throw new IllegalStateException("Destination directory ["
                + toDir.getCanonicalPath() + "] cound not be created!");
        if (!toDir.isDirectory()) throw new IllegalStateException("Destination directory [" + toDir.getCanonicalPath()
                + "] is not valid!");
        recurseIt(fromDir, toDir, overwrite);
    }

    public static void main(String[] args) {
        try {
            copyDir(new File("C:\\Temp"), new File("D:\\Temp"), false);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }