案列1:獲取token

    /**
     * 獲取token.
     * @param requestUrl 請(qǐng)求地址
     * @param accessKey accessKey
     * @return token字符串
     */
    public static String getToken(String requestUrl, String accessKey) {
        //token信息
        String access_token = null;
        String charset = "utf-8";
        try {
            CloseableHttpClient httpClient = HttpClients.createDefault();

            HttpGet httpGet = new HttpGet(requestUrl);
            httpGet.setHeader("Access-Key", accessKey);
            HttpResponse response = httpClient.execute(httpGet);
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    String result = EntityUtils.toString(resEntity, charset);
                    JSONObject jsonbody = JSONObject.parseObject(result);
                    access_token = ((String) jsonbody.get("access_token"));
                }
            }
        } catch (Exception e) {
            LOGGER.error("獲取Token失敗", e);
        }
        return access_token;
    }