读取File内容到另个File -2

package com;
 

 import java.io.File;
 
 import java.io.FileInputStream;
 
 import java.io.FileOutputStream;
 
 import java.io.IOException;
 
 import java.io.InputStream;
 

 public class FileIO2 {
 
  
  
   
 
  
  
   
 
  
  
   
 public static void main(String[] args) throws IOException {
 

  
  
   
  
  
   
 File file = new File("R:\\haha.txt");
 
  
  
   
  
  
   
 File file2 = new File("R:\\haha2.txt");
 
  
  
   
  
  
   
 StringBuilder sb = new StringBuilder();//声明 StringBuilder 用来存放读取的内容
 
  
  
   
  
  
   
 InputStream is = null;
 
  
  
   
  
  
   
 FileOutputStream fo = null;
 
  
  
   
  
  
   
 is = new FileInputStream(file);//把文件读到输入流
 
  
  
   
  
  
   
 int len = 0;
 
  
  
   
  
  
   
 byte[] buf = new byte[1024];
 
  
  
   
  
  
   
 while((len=is.read(buf))>0){
 
  
  
   
  
  
   
  
  
   
 fo = new FileOutputStream(file2);
 
  
  
   
  
  
   
  
  
   
 sb.append(new String(buf,0,len));
 
  
  
   
  
  
   
  
  
   
 fo.write(sb.toString().getBytes());//写到文件
 
  
  
   
  
  
   
  
  
   
 
  
  
   
  
  
   
 }
 
  
  
   
  
  
   
 is.close();
 
  
  
   
  
  
   
 fo.close();
 
  
  
   
 

  
  
   
 }
 

 }