2021-09-05 IO流(字节流的缓冲区)

import java.io.*;

public class CopyPicBuf {

    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("E:\\src.png");
        BufferedInputStream bis = new BufferedInputStream(fis);
        FileOutputStream fos = new FileOutputStream("E:\\copy.png");
        BufferedOutputStream bos = new BufferedOutputStream(fos);
//        long start = System.currentTimeMillis();
        byte[] buf = new byte[1024];
        int len;
        while ((len = bis.read(buf)) != -1) {
            bos.write(buf, 0, len);
        }
//        long end = System.currentTimeMillis();
//        System.out.println("耗时: " + (end - start));
        bis.close();
        bos.close();
    }

}