java如何一行一行地记取出文本txt的内容呀

Question

FileReader filereader = new FileReader(filename);
BufferedReader  filein = new BufferedReader(filereader);
String linestring;
while((linestring=filein.readLine())!=null)
{
 out.println(linestring);
}
filein.close();
filereader.close();

Answer 1

import java.io.*;
public class RandomAccessFileMy{
public static void main(String args[])
{
if (args.length!=1)
{
System.out.println("请输入要打开的文本文件名<textfile>:");
System.exit(0);
}
String filename=args[0];
try
{
RandomAccessFile file=new RandomAccessFile(filename,"r");
long filepointer=0;
long length=file.length();
while(filepointer<length)
{
String s=file.readLine();
System.out .println(filepointer);
System.out.println(s);
filepointer=file.getFilePointer();
}
}
catch(IOException e)
{
e.printStackTrace();
}
}
}