问照片人身核验使用v3鉴权接口签名总是签名失败，很急已经要疯掉了？

public static void main(String[] args) throws Exception {
  String service = "faceid";
  //String host = "faceid.tencentcloudapi.com";//人脸检测与分析功能请求域名
  String host = "faceid.ap-shanghai-fsi.tencentcloudapi.com"; //照片人脸核身
  String region = "ap-shanghai-fsi"; //公共参数 可不填写
  String action = "ImageRecognition";  //公共参数 接口名称
  String version = "2018-03-01"; //公共参数 当前日期
  String algorithm = "TC3-HMAC-SHA256"; //签名算法
  //String timestamp = "1551113065";  //
  String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
  // 注意时区，否则容易出错
  sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
  String date = sdf.format(new Date(Long.valueOf(timestamp + "000")));

  // ************* 步骤 1：拼接规范请求串 *************
  String httpRequestMethod = "POST";
  String canonicalUri = "/";
  String canonicalQueryString = "";
  String canonicalHeaders = "content-type:application/json;charset=utf-8\n" + "host:" + host + "\n";
  String signedHeaders = "content-type;host";

  String name = URLEncoder.encode("", "utf-8");
  String payload = "{\"Action\":\"ImageRecognition\",\"IdCard\":\"\",\"Name\":\"\",\"ImageBase64\":\"\"}";
  String hashedRequestPayload = sha256Hex(payload);
  String canonicalRequest = httpRequestMethod + "\n" + canonicalUri + "\n" + canonicalQueryString + "\n"
      + canonicalHeaders + "\n" + signedHeaders + "\n" + hashedRequestPayload;
  System.out.println(canonicalRequest);

  // ************* 步骤 2：拼接待签名字符串 *************
  String credentialScope = date + "/" + service + "/" + "tc3_request";
  String hashedCanonicalRequest = sha256Hex(canonicalRequest);
  String stringToSign = algorithm + "\n" + timestamp + "\n" + credentialScope + "\n" + hashedCanonicalRequest;
  System.out.println(stringToSign);

  // ************* 步骤 3：计算签名 *************
  byte[] secretDate = hmac256(("TC3" + SECRET_KEY).getBytes(UTF8), date);
  byte[] secretService = hmac256(secretDate, service);
  byte[] secretSigning = hmac256(secretService, "tc3_request");
  String signature = DatatypeConverter.printHexBinary(hmac256(secretSigning, stringToSign)).toLowerCase();
  System.out.println("signature:"+signature);

  // ************* 步骤 4：拼接 Authorization *************
  String authorization = algorithm + " " + "Credential=" + SECRET_ID + "/" + credentialScope + "," + "SignedHeaders=" + signedHeaders + "," + "Signature=" + signature;
  System.out.println("authorization:"+authorization);

  TreeMap<String, String> headers = new TreeMap<String, String>();
  headers.put("Authorization", authorization);
  headers.put("Content-Type", CT_JSON);
  headers.put("Host", host);
  headers.put("X-TC-Action", action);
  headers.put("X-TC-Timestamp", timestamp);
  headers.put("X-TC-Version", version);
  headers.put("X-TC-Region", region);

  StringBuilder sb = new StringBuilder();
  sb.append("curl -X POST https://").append(host)
      .append(" -H \"Authorization: ").append(authorization).append("\"")
      .append(" -H \"Content-Type: application/json;charset=utf-8\"")
      .append(" -H \"Host: ").append(host).append("\"")
      .append(" -H \"X-TC-Action: ").append(action).append("\"")
      .append(" -H \"X-TC-Timestamp: ").append(timestamp).append("\"")
      .append(" -H \"X-TC-Version: ").append(version).append("\"")
      .append(" -H \"X-TC-Region: ").append(region).append("\"")
      .append(" -d '").append(payload).append("'");
  System.out.println(sb.toString());
}