使用缓冲流和byte数组，拷贝文件

package com.itcast.demo05.Buffered;

import java.io.*;

/**
 * @author newcityman
 * @date 2019/7/28 - 17:05
 */
public class BufferedCopy {
    public static void main(String[] args) throws IOException {
        long s = System.currentTimeMillis();
        BufferedInputStream  bis = new BufferedInputStream(new FileInputStream("H:\IMG_7621.JPG"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("e:\IMG_7621.JPG"));

        int len=0;
        byte[] bytes = new byte[2048];
        while((len=bis.read(bytes))!=-1){
            bos.write(bytes,0,len);
        }

        bos.close();
        bis.close();
        long e = System.currentTimeMillis();
        System.out.println("拷贝文件总共耗时："+(e-s)+"毫秒");
    }

}