Copy directory

public void copy(File sourceLocation, File targetLocation) throws IOException {
    if (sourceLocation.isDirectory()) {
        copyDirectory(sourceLocation, targetLocation);
    } else {
        copyFile(sourceLocation, targetLocation);
    }
}

private void copyDirectory(File source, File target) throws IOException {
    if (!target.exists()) {
        target.mkdir();
    }

    for (String f : source.list()) {
        copy(new File(source, f), new File(target, f));
    }
}

private void copyFile(File source, File target) throws IOException {
    try (
            InputStream in = new FileInputStream(source);
            OutputStream out = new FileOutputStream(target)
    ) {
        byte[] buf = new byte[1024];
        int length;
        while ((length = in.read(buf)) > 0) {
            out.write(buf, 0, length);
        }
    }
}