Dada_WenJian - 秒客网

 import java.io.BufferedReader;

 import java.io.File;

 import java.io.FileReader;

 import java.io.FileWriter;

 import java.io.PrintWriter;

 import java.util.Scanner;

 public class F1_F2_copy {

     public void F1_F2(File f1,File f2)

     {

         try

         {

             int i=1;

             //写入f2

             FileWriter fw=new FileWriter(f2,false);

             PrintWriter pw=new PrintWriter(fw);

             //阅读f1

             Scanner shuru = new Scanner(new BufferedReader(new FileReader(f1)));

         while(shuru.hasNext())

         {

             pw.println(i+"  "+shuru.next());//插入行号

             i++;

         }

             pw.flush();

             pw.close();

             fw.close();

         }

         catch(Exception e)

         {

             System.out.println("错误");

         }

     }

 }
对一个空文本复制一个有行号的文本