如何复制指定路径的文件夹到指定的路径下

    /**
     * 复制一个目录及其子目录、文件到另外一个目录
     * @param src
     * @param dest
     * @throws IOException
     */
    private void copyFolder(File src, File dest) throws IOException {
        if (src.isDirectory()) {
            if (!dest.exists()) {
                dest.mkdir();
            }
            String files[] = src.list();
            for (String file : files) {
                File srcFile = new File(src, file);
                File destFile = new File(dest, file);
                // 递归复制
                copyFolder(srcFile, destFile);
            }
        } else {
            InputStream in = new FileInputStream(src);
            OutputStream out = new FileOutputStream(dest);

            byte[] buffer = new byte[1024];

            int length;
            
            while ((length = in.read(buffer)) > 0) {
                out.write(buffer, 0, length);
            }
            in.close();
            out.close();
        }
    }