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();

     }

}