Java 字节流复制视频

思路
1.根据数据源创建字节流输入对象
2.根据目的地创建字节流输出对象
3.读写数据, 复制视频
4.释放资源

代码示例

public static void main(String[] args) throws IOException {
        //记录开始事件
        long startTime = System.currentTimeMillis();

        //复制视频
        //method1();
        //method2();
        //method3();
        method4();

        //记录结束时间
        long endTime = System.currentTimeMillis();
        System.out.println("共耗时" + (endTime - startTime) + "毫秒");
    }

    //基本字节流一次读写一个字节
    public static void method1() throws IOException {
        FileInputStream fis = new FileInputStream("D:\\TV.avi");
        FileOutputStream fos = new FileOutputStream("D:\\java\\TV.avi");

        int by;
        while ((by = fis.read()) != -1) {
            fos.write(by);
        }

        fis.close();
        fos.close();
    }

    //基本字节流一次读写一个字节数组
    public static void method2() throws IOException {
        FileInputStream fis = new FileInputStream("D:\\TV.avi");
        FileOutputStream fos = new FileOutputStream("D:\\java\\TV.avi");

        byte[] bys =new byte[1024];
        int len;
        while ((len = fis.read(bys)) != -1) {
            fos.write(bys,0,len);
        }

        fis.close();
        fos.close();
    }


    //字节缓冲流一次读写一个字节
    public static void method3() throws IOException {
        BufferedInputStream bis=new BufferedInputStream(new FileInputStream("D:\\TV.avi"));
        BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream("D:\\java\\TV.avi"));
        int by;
        while ((by = bis.read()) != -1) {
            bos.write(by);
        }

        bis.close();
        bos.close();
    }

    //字节缓冲流一次读写一个字节数组
    public static void method4() throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\TV.avi"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:\\java\\TV.avi"));

        byte[] bys =new byte[1024];
        int len;
        while ((len = bis.read(bys)) != -1) {
            bos.write(bys,0,len);
        }

        bis.close();
        bos.close();
    }

由实验可以得知
第四种方法的速度时最快的:字节缓冲流一次读写一个字节数组