Java 读取文本指定的某一行内容的方法

/**

  * @author：罗大锤

  * @date: 2017年9月6日 下午2:35:43

  * @version 1.0

  * @method:读取文本具体某行内容

  * @parameter

  * @since

  * @return

  */

public class opentextline {

     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 = 9999999 ; //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();

     }

}