字符流定义字符集

        BufferedReader bfr = new BufferedReader(                new InputStreamReader(                        new BufferedInputStream(                                new FileInputStream("test.txt")                                     ),"UTF-8")                );        String line = bfr.readLine();        System.out.println(line);        line = bfr.readLine();        System.out.println(line); // null,文件结尾        bfr.close();