Io流之用缓冲流实现文件的复制

package Io流;

import org.junit.Test;

import java.io.*;

/**
 * 磁盘，键盘------输入（读）------->程序-------输出（写）----->磁盘，键盘
 * 缓冲流
 * BufferedInputStream
 * BufferedOutputStream
 */
public class Demo05 {
    @Test
    public void test(){
        long startTime = 0;
        long endTime = 0;
        FileInputStream fis = null;
        FileOutputStream fos = null;
        BufferedInputStream bfis = null;
        BufferedOutputStream bfos = null;
        try {
            startTime = System.currentTimeMillis();
            fis = new FileInputStream("d:\\11.txt");
            bfis = new BufferedInputStream(fis);
            fos = new FileOutputStream("e:\\1.txt");
            bfos = new BufferedOutputStream(fos);

            byte[] bytes = new byte[1024];
            int len = 0;
            while ((len =bfis.read(bytes))!=-1 ){
                bfos.write(bytes,0,len);
            }
            endTime = System.currentTimeMillis();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try {
                System.out.println(endTime-startTime);
                bfos.close();
                bfis.close();
                fos.close();
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}