拷贝文件夹到一个新的文件

/**
 * 拷贝文件夹到一个新的文件
 * 
 * @param newPath 要拷贝的文件路径
 * @param oldPath 要拷贝到哪个路径
 * @throws IOException 异常抛出由调用者处理
 */
public static void copyDirs(String oldPath, String newPath) throws IOException {
        (new File(newPath)).mkdirs();
        File f = new File(oldPath);
        String[] list = f.list();
        File temp = null;
for (String file : list) {
            temp = new File(oldPath + "\\" + file);
if (temp.isFile()) {
                BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(temp));
                BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(newPath + "\\" + temp.getName()));
int len;
byte[] bs = new byte[1024 * 4];
while ((len = inputStream.read(bs)) != -1) {
                    outputStream.write(bs, 0, len);
                }
                outputStream.flush();
                outputStream.close();
                inputStream.close();
            }
if (temp.isDirectory()) {
                copyDirs(oldPath + "\\" + file, newPath+"\\"+file);
            }
        }
    }