/**
     * 獲取識別驗證碼
     * @param imageUrl
     * @return
     */
    public static String OCRVCode(String imageUrl){
        String VCode = "";

        if (StringUtils.isBlank(ACCESS_TOKEN)) {
            logger.error("accessToken為空");
            return VCode;
        }
        OCRUrl = OCRUrl + "?access_token=" + ACCESS_TOKEN;

        HashMap<String, String> headers = new HashMap<>();
        headers.put("Content-Type", "application/x-www-form-urlencoded");

        HashMap<String, String> params = new HashMap<>();
        imageUrl = ImageBase64ToStringUtils.imageToStringByBase64(imageUrl);
        params.put("image", imageUrl);

        HttpRequestData httpRequestData = new HttpRequestData();
        httpRequestData.setHeaders(headers);
        httpRequestData.setRequestMethod("post");
        httpRequestData.setParams(params);
        httpRequestData.setRequestUrl(OCRUrl);
        HttpResponse response = HttpClientUtils.execute(httpRequestData);
        String json = "";
        if (response.getStatusLine().getStatusCode() == 200) {
            try {
                json = IOUtils.toString(response.getEntity().getContent());
                JSONObject jsonObject = JSONObject.parseObject(json);
                JSONArray wordsResult = jsonObject.getJSONArray("words_result");
                VCode = wordsResult.getJSONObject(0).getString("words");
            } catch (IOException e) {
                logger.error("請求識別失敗！", e);
            }
        }
        return VCode;
    }