前端各种图片格式转化为本地File文件

public class ImageFileUtil {

    private static final Logger logger = LoggerFactory.getLogger(ImageFileUtil.class);

    /**
     * multipartFile转本地文件
     *
     * @param multipartFile
     * @param filePath
     * @return
     */
    public static File getFileByMultipartFile(MultipartFile multipartFile, String filePath) throws IOException {
        File file;
        String name;
        do {
            name = "" + System.currentTimeMillis() + RandomStringUtils.randomNumeric(5) + "." + "jpg";
            file = new File(filePath, name);
        } while (file.exists());
        multipartFile.transferTo(file);
        return file;
    }

    /**
     * 根据url获取本地图片
     *
     * @param fileUrl
     * @param filePath
     * @return
     * @throws IOException
     */
    public static File getFileByUrl(String fileUrl, String filePath) throws IOException {
        File file;
        File parentDir = new File(filePath);
        if (!parentDir.exists()) {
            parentDir.mkdirs();
        }
        String name;
        do {
            name = "" + System.currentTimeMillis() + RandomStringUtils.randomNumeric(5) + "." + "jpg";
            file = new File(parentDir, name);
        } while (file.exists());
        URL imageUrl = new URL(fileUrl);
        HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
        try (InputStream inputStream = conn.getInputStream();
             BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(file));
             ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        ) {
            byte[] buffer = new byte[1024];
            int len = 0;
            while ((len = inputStream.read(buffer)) != -1) {
                outStream.write(buffer, 0, len);
            }
            stream.write(outStream.toByteArray());
        } catch (Exception e) {
            throw new RuntimeException("创建人脸获取服务器图片异常");
        }
        return file;
    }

    /**
     * base64字符串转化成图片
     *
     * @param base64
     * @param filePath
     * @return
     */
    public static File base64ToFile(String base64, String filePath) {
        if (base64.contains("data:image")) {
            base64 = base64.substring(base64.indexOf(",") + 1);
        }
        base64 = base64.replace("\r\n", "");
        File file;
        //创建文件目录
        File parentDir = new File(filePath);
        if (!parentDir.exists()) {
            parentDir.mkdirs();
        }
        String name;
        do {
            name = "" + System.currentTimeMillis() + RandomStringUtils.randomNumeric(5) + "." + "jpg";
            file = new File(parentDir, name);
        } while (file.exists());
        try (BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file))) {
            BASE64Decoder decoder = new BASE64Decoder();
            byte[] bytes = decoder.decodeBuffer(base64);
            bos.write(bytes);
        } catch (Exception e) {
            throw new RuntimeException("创建人脸获取服务器图片异常");
        }
        return file;
    }
}