java io 练习

package cn.edu.nankai.io;
import java.io.*;
public class Duanlei {
public static void main(String [] args) throws Exception{
    FileInputStream file=new FileInputStream("c:\\1.txt");
    BufferedInputStream in=new BufferedInputStream(file);
    byte buf[]=new byte[8192];
    BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream("c:\\3.txt"));
    int len=0;
    int bytesRead=0;
    while((bytesRead = in.read(buf, 0, 8192)) != -1)
    {
    out.write(buf,0,bytesRead);        
    System.out.println(bytesRead);
    }
      in.close();
out.close();
    
   
}
}