根据图片url地址获取其流InputStream

  /**
     * 根据图片url地址获取其流
     * @param url 网络图片地址
     * @return 图片流
     */
    public static InputStream getImageStream(String url) {
        try {
            HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
            connection.setReadTimeout(5000);
            connection.setConnectTimeout(5000);
            connection.setRequestMethod("GET");
            if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                InputStream inputStream = connection.getInputStream();
                return inputStream;
            }
        } catch (IOException e) {
            System.out.println("获取网络图片出现异常，图片路径为：" + url);
            e.printStackTrace();
        }
        return null;
    }

    // InputStream -> File
    private static void copyInputStreamToFile(InputStream inputStream, File file)
            throws IOException {

        try (FileOutputStream outputStream = new FileOutputStream(file)) {

            int read;
            byte[] bytes = new byte[1024];

            while ((read = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, read);
            }
        }
    }

main方法测试即可

File file= new File("D:\\111.mp4");
copyInputStreamToFile(getImageStream("url地址"),file）