public void fun() {
        List<String> line = new ArrayList<>();
        try {
            File file = new File("E:\\aaa.txt");
            //建立一個檔案輸入流，InputStream是位元組輸入流的超類
            InputStream in = new FileInputStream(file);
            //InputStreamReader是位元組流和字元流之間的橋樑，轉化時需要指定字符集，否則按照系統字符集轉換
 

            Reader reader = new InputStreamReader(in, "gbk");
            //建立緩衝字元輸入流
            BufferedReader br = new BufferedReader(reader);
            String s;
            while ((s = br.readLine()) != null) {
                line.add(s);
            }
            //先開啟的流後關閉，關聯的流只關閉最後一個即可
            br.close();
            for
 
 (String str : line) {
                System.out.println(str);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }