java 字节流

package com.jack.io;

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

public class main {
    public static void main(String[] args) throws Exception {
        //文件的复制
        long s = System.currentTimeMillis();
        File file1 = new File("D:\\迅雷下载\\公牛犹斗.1080p.HD中字.mp4");
        File file2 = new File("D:\\迅雷下载\\公牛犹斗.1080p.HD中字2.mp4");

        FileInputStream fileInputStream = new FileInputStream(file1);
        FileOutputStream fileOutputStream = new FileOutputStream(file2, true);
        byte[] bs = new byte[1024*1024];

        while ((fileInputStream.read(bs)) != -1) {
            fileOutputStream.write(bs);
        }

        fileInputStream.close();
        fileOutputStream.close();
        long e = System.currentTimeMillis();
        System.out.println("复制文件，耗时毫秒：" + (e - s));
    }
}