javeee 字节Buffered

package Zy;
 
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
 
public class Zy04 {
            //4.用缓冲字节流完成eclipse.zip的复制
    public static void main(String[] args) throws IOException {
        long time1=System.currentTimeMillis();
        FileInputStream fis=new FileInputStream("e:\\eclipse.zip");
        BufferedInputStream bf=new BufferedInputStream(fis);
        FileOutputStream fos=new FileOutputStream("e:\\java\\123\\eclipse.zip");
        BufferedOutputStream bd=new BufferedOutputStream(fos);
        byte[] bytes=new byte[1024];
        int len=0;
        while((len=bf.read(bytes))!=-1){
            bd.write(bytes,0,len);
            bd.flush();
        }
            bd.close();
            long time2=System.currentTimeMillis();
            System.out.println((time2-time1)/1000);
    }
}