读取File内容到另个File -1

package com;
 

 import java.io.BufferedReader;
 
 import java.io.File;
 
 import java.io.FileInputStream;
 
 import java.io.FileOutputStream;
 
 import java.io.IOException;
 
 import java.io.InputStreamReader;
 

 public class FileIO {
 

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

  
  
   
  
  
   
 File file = new File("R:\\haha2.txt");//读取文件haha2.txt
 
  
  
   
  
  
   
 File file2 = new File("R:\\haha.txt");//读取文件haha.txt
 
  
  
   
  
  
   
 BufferedReader br = new BufferedReader(new InputStreamReader(
 
  
  
   
  
  
   
  
  
   
  
  
   
 new FileInputStream(file2)));//用BufferedReader读取文件流
 
  
  
   
  
  
   
 String line;
 
  
  
   
  
  
   
 FileOutputStream fs = null;
 
  
  
   
  
  
   
 while ((line = br.readLine()) != null) {//一次 读取 一行内容
 
  
  
   
  
  
   
  
  
   
 if (file.exists()) {
 
  
  
   
  
  
   
  
  
   
  
  
   
 fs = new FileOutputStream(file,true);//=====加上 true=====
 
  
  
   
  
  
   
  
  
   
  
  
   
 fs.write(line.getBytes());
 
  
  
   
  
  
   
  
  
   
 } else {
 
  
  
   
  
  
   
  
  
   
  
  
   
 file.createNewFile();//创建 文件 txt
 
  
  
   
  
  
   
  
  
   
 }
 
  
  
   
  
  
   
 }
 

  
  
   
  
  
   
 fs.flush();
 
  
  
   
  
  
   
 fs.close();
 
  
  
   
  
  
   
 br.close();
 

  
  
   
 }
 

 }