signature签名获取不对

贴一下sign的代码：
public static String sign(String ticket, String nonceStr, long timeStamp, String url) throws OApiException {
        String plain = "jsapi_ticket=" + ticket + "&noncestr=" + nonceStr + "&timestamp=" + String.valueOf(timeStamp)
        + "&url=" + url;
        try {
            MessageDigest sha1 = MessageDigest.getInstance("SHA-1");
            sha1.reset();
            sha1.update(plain.getBytes("UTF-8"));
            return bytesToHex(sha1.digest());
        } catch (NoSuchAlgorithmException e) {
            throw new OApiResultException(e.getMessage());
        } catch (UnsupportedEncodingException e) {
            throw new OApiResultException(e.getMessage());
        }
    }
    private static String bytesToHex(byte[] hash) {
        Formatter formatter = new Formatter();
        for (byte b : hash) {
            formatter.format("%02x", b);
        }
        String result = formatter.toString();
        formatter.close();
        return result;
    }
然后我就在js中配置了config，可是dd.device.notification.confirm就是不执行，把config注释掉之后才执行，我猜想是config配置有问题，找了好久就是不知道哪里有问题

dd.config({
        agentId:agentId,
        corpId: corpId,
        timeStamp: timeStamp,
        nonceStr:nonceStr,
        signature: signature,
        jsApiList: ['device.notification.alert', 'device.notification.confirm','device.geolocation.get']
    });


        dd.ready(function() {
            dd.device.notification.confirm({
                message: "config还是不对啊！！！",
                title: "提示",
                buttonLabels: ['z', 'z'],
                onSuccess : function(result) {
                    //onSuccess将在点击button之后回调
                    /*
                    {
                        buttonIndex: 0 //被点击按钮的索引值，Number类型，从0开始
                    }
                    */
                },
                onFail : function(err) {}
            });
        });