BufferedReader br =                                                                 //更高效的读
                                new BufferedReader(new InputStreamReader(new FileInputStream("kkk.txt"), "utf-8"));
                BufferedWriter bw =
                                new BufferedWriter(new OutputStreamWriter(new FileOutputStream("lll.txt"),"utf-8"));

我想要把写出的文件也是用utf-8编码的 该怎么写,很明显我上面的代码输出的是乱码