网络文件转换为转成MultipartFile

public static InputStream getInputStreamByUrl(String urlStr){
        DataInputStream in = null;
        try {
            URL url = new URL(urlStr);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            in = new DataInputStream(conn.getInputStream());
        } catch (IOException e) {
            System.out.println("url转换输入流失败,错误信息{}"+e.getMessage());
        }
        return in;
    }
public static void main(String[] args) {
        try {
            String url = "https://s3.cn/20230908101719A007.png";
            String name = url.substring(url.lastIndexOf("/")+1);
            // 创建一个MockMultipartFile对象，将输入流和文件名设置为其属性
            MultipartFile imageFile = new MockMultipartFile("file", name, MediaType.APPLICATION_OCTET_STREAM_VALUE, getInputStreamByUrl(url));
            // 获取上传的图片文件名
            String fileName = imageFile.getOriginalFilename();
            // 确定保存图片的路径
            String filePath = "D:/static/image/";
            // 将图片保存到指定位置
            imageFile.transferTo(new File(filePath + fileName));
        } catch (IOException e) {
 
        }
    }