钉钉免登获取标签数据

[朝着大牛努力]

public static String getSign(String ticket, String nonceStr, long timeStamp, String url) throws Exception {
String plain = "jsapi_ticket=" + ticket + "&noncestr=" + nonceStr + "timeStamp=" + String.valueOf(timeStamp)
+ "&url=" + url;
try {
MessageDigest sha1 = MessageDigest.getInstance("SHA-1"); //安全hash算法
sha1.reset();
sha1.update(plain.getBytes("UTF-8")); //根据参数产生hash值
return bytesToHex(sha1.digest());
} catch (NoSuchAlgorithmException e) {
throw new Exception(e.getMessage());
} catch (UnsupportedEncodingException e) {
throw new Exception(e.getMessage());
}

}
//将bytes类型的数据转化为16进制类型
private static String bytesToHex(byte[] hash) { //将字符串转化为16进制的数据
Formatter formatter = new Formatter();
for (byte b : hash) {
formatter.format("%02x", b);
}
String result = formatter.toString();
formatter.close();
return result;
}
获得的签名数据和测试平台生成的不一样，请问这儿哪里出问题了