/**
 * 处理流之一：缓冲流的使用
 *
 * 1.缓冲流
 * BufferedInputStream
 * BufferedOutputStream
 * BufferedReader
 * BufferedWriter
 *
 * 2.作用：提高流的读取、写入的速度
 *      提高读写速度的原因：内部提供了一个缓冲区
 */
public class BufferedTest {
//实现文件复制的方法
    public void copyFileWithBuffered(String srcPath, String destPath) throws IOException {
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            //1.造文件
            File srcFile = new File("爱情与友情.jpg");
            File destFile = new File("爱情与友情3.jpg");

            //2.造流
            //2.1造节点流
            FileInputStream fis = new FileInputStream(srcFile);
            FileOutputStream fos = new FileOutputStream(destFile);

            //2.2造缓冲流
            bis = new BufferedInputStream(fis);
            bos = new BufferedOutputStream(fos);

            //3.复制的细节：读取、写入
            byte[] buffer = new byte[10];
            int len;
            while ((len = bis.read(buffer)) != -1) {
                bos.write(buffer, 0, len);

                bos.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //4.资源的关闭
            bis.close();
            bos.close();
        }
    }

    @Test
    public void testCopyFileWithBuffered(){
        long start = System.currentTimeMillis();

        String srcPath = "C:\\Users\\Administrator\\Desktop\\01-视频.avi";
        String destPath = "C:\\Users\\Administrator\\Desktop\\02-视频.avi";

        try {
            copyFileWithBuffered(srcPath, destPath);
        } catch (IOException e) {
            e.printStackTrace();
        }

        long end = System.currentTimeMillis();

        System.out.println("复制操作花费的时间为：" + (end - start));//618
    }
}