使用缓冲流实现对图片的复制

注意：最后关闭流的时候，只需要关闭外层的缓冲流，因为会自动帮我们关闭内层的输入/输出流

package test19;
import java.io.*;
/**
 * Created By Intellij IDEA
 *
 * @author Xinrui Yu
 * @date 2021/12/5 16:03 星期日
 */
public class Application {
    public static void main(String[] args) {
        FileInputStream fileInputStream = null;
        FileOutputStream fileOutputStream = null;
        BufferedInputStream bufferedInputStream = null;
        BufferedOutputStream bufferedOutputStream = null;
        byte[] buffer = new byte[1024];
        try{
            fileInputStream = new FileInputStream("lupin.mp4");
            fileOutputStream = new FileOutputStream("lupin3.mp4");
            bufferedInputStream = new BufferedInputStream(fileInputStream);
            bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
            while((bufferedInputStream.read(buffer)) != -1){
                bufferedOutputStream.write(buffer);
            }
        }catch (IOException e){
            e.printStackTrace();
        }finally {
            if(bufferedInputStream != null){
                try {
                    bufferedInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(bufferedOutputStream != null){
                try {
                    bufferedOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}