Java读取文本指定的某一行内容的方法

    public static void main(String[] args) throws IOException {

        long timeStart = System.currentTimeMillis();

        File file = new File("testData.txt");//文件路径

        FileReader fileReader = new FileReader(file);

        LineNumberReader reader = new LineNumberReader(fileReader);

        int number = 99;//设置指定行数

        String txt = "";

        int lines = 0;

        while (txt != null) {

            lines++;

            txt = reader.readLine();

            if (lines == number) {

                System.out.println("第" + reader.getLineNumber() + "的内容是：" + txt + "\n");

                long timeEnd = System.currentTimeMillis();

                System.out.println("总共花费：" + (timeEnd - timeStart) + "ms");

                System.exit(0);

            }

        }

        reader.close();

        fileReader.close();

    }

}