一、使用字节流复制图片

public static void main(String[] args) throws IOException {
    FileInputStream fileInputStream = new FileInputStream("IMG_2185.PNG");
    FileOutputStream fileOutputStream = new FileOutputStream("img.jpg");
    byte[] buffer = new byte[1024];
    int len;
    while((len = fileInputStream.read(buffer)) != -1){
        fileOutputStream.write(buffer,0,len);
    }
    fileInputStream.close();
    fileOutputStream.close();
}

二、使用字节流复制音频

public static void main(String[] args) throws IOException {
    FileInputStream fileInputStream = new FileInputStream("1.mp3");
    FileOutputStream fileOutputStream = new FileOutputStream("2.mp3");
    byte[] buffer = new byte[1024];
    int len;
    while((len = fileInputStream.read(buffer)) != -1){
        fileOutputStream.write(buffer,0,len);
    }
    fileInputStream.close();
    fileOutputStream.close();
}

三、使用字节流复制视频

public static void main(String[] args) throws IOException {
    FileInputStream fileInputStream = new FileInputStream("lupin.mp4");
    FileOutputStream fileOutputStream = new FileOutputStream("lupin2.mp4");
    byte[] buffer = new byte[1024];
    int len;
    while((len = fileInputStream.read(buffer)) != -1){
        fileOutputStream.write(buffer,0,len);
    }
    fileInputStream.close();
    fileOutputStream.close();
}