在请求接口时，通过accessKeyId和accessKeySecret对请求进行签名，实现对用户身份的验证。其中accessKeyId是访问密钥ID，accessKeySecret是密钥。使用accessKeyId和accessKeySecret进行签名，在请求时将签名信息添加到消息头，从而通过身份认证。

请求时header中会增加如下参数：

签名算法如下：

 /**     * 获取aksk签名      *      * @param accessKeyId     ak      * @param accessKeySecret sk      * @param timestamp       时间戳      * @param httpMethod      GET/POST      * @param url             请求url,不带 域名 端口,不带参数,以/开头不以/结尾      * @return 签名串      */     public static String signByAKSK(String accessKeyId, String accessKeySecret, long timestamp, String httpMethod, String url) {         String sign = null;         try {             Charset charset = StandardCharsets.UTF_8;             URI uri = new URI(url);             String path = uri.getPath();             if (StringUtils.endsWith(path, "/")) {                 path = StringUtils.removeEnd(path, "/");             }             Mac mac = Mac.getInstance("HmacSHA256");             SecretKeySpec key = new SecretKeySpec(accessKeySecret.getBytes(charset), "HmacSHA256");             mac.init(key);             String signStr = accessKeyId + timestamp + httpMethod.toUpperCase(Locale.ENGLISH) + path;             sign = Base64.getEncoder().encodeToString(mac.doFinal(signStr.getBytes(charset)));         } catch (Exception e) {             log.error("signByAKSK fail.", e);         }         return sign;     }