微信扫一扫功能实现-附全部代码

 首先在调用微信的JS-SDK接口的时候需要仔细阅读一下官方的注意事项，否则可能事倍功半。这里先大概概述一下主要的流程，首先，使用微信扫一扫需要一个已经通过认证的公众号；其次，需要知道公众号的APPID以及APPSecrect，以便获取Access_Token和Ticket；再有就是需要了解.NET内部的SHA1的加密类；最后引用官方的JS，就可以了。

VIEW代码

需要注意的是，公众号一定要有域名绑定

    
    
     
    
    
    



    

        
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Controller代码

 

首先，我们需要根据APPID和APPSecrect来获取Access_Token，之后根据AccessToken来获取jsapi_ticket。最后，在Controller内部生成时间戳，随机字符串，之后将ticket以及前两者根据SHA1加密成签名,并发送给微信服务器，通过认证之后，这样就可以调用扫一扫的接口了。

public ActionResult Index()
        {
            //获取ACCESS_TOKEN
            string _url = Request.Url.ToString();
            //获取Ticket
            string _ticket = Requestjsapi_ticket(Request_Url());
            //获取ticket
            string _finalticket = _ticket;
            //获取noncestr
            string _noncestr = CreatenNonce_str();
            //获取timestamp
            long _timestamp = CreatenTimestamp();
            //获取sinature
            string _sinature = GetSignature(_finalticket, _noncestr, _timestamp, _url).ToLower();

            ViewBag.appid = "这里填写你的APPID";
            ViewBag.timestamp = _timestamp;
            ViewBag.noncestr = _noncestr;
            ViewBag.sinature = _sinature;
            return View();

        }

//获取AccessToken
        public static string Request_Url()
        {
            // 设置参数
            string _appid = "这里写入你的APPID";
            string _appsecret = "这里写入你的APPSecrect";
            string _url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + _appid + "&secret=" + _appsecret;
            string method = "GET";
            HttpWebRequest request = WebRequest.Create(_url) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = method;
            request.ContentType = "text/html";
            request.Headers.Add("charset", "utf-8");

            //发送请求并获取相应回应数据
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程序才开始向目标网页发送Post请求
            Stream responseStream = response.GetResponseStream();
            StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);
            //返回结果网页（html）代码
            string content = sr.ReadToEnd();
            //由于微信服务器返回的JSON串中包含了很多信息，我们只需要将AccessToken获取就可以了，需要将JSON拆分
            String[] str = content.Split('"');
            content = str[3];
            return content;
        }

 //根据AccessToken来获取jsapi_ticket
        public static string Requestjsapi_ticket(string accesstoken)
        {

            string _accesstoken = accesstoken;
            string url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + _accesstoken + "&type=jsapi";
            string method = "GET";
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = method;
            request.ContentType = "text/html";
            request.Headers.Add("charset", "utf-8");
            //发送请求并获取相应回应数据
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程序才开始向目标网页发送Post请求
            Stream responseStream = response.GetResponseStream();
            StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);
            //返回结果网页（html）代码
            string content = sr.ReadToEnd();
            //同样，返回的JSON中只要取出ticket的信息即可
            String[] str = content.Split('"');
            content = str[9];
            return content;
        }

//接下来就是辅助工具类，生成随机字符串
#region 字符串随机 CreatenNonce_str()
        private static string[] strs = new string[]
                                    {
                                    "a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z",
                                    "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"
                                    };
        public static string CreatenNonce_str()
        {
            Random r = new Random();
            var sb = new StringBuilder();
            var length = strs.Length;
            for (int i = 0; i < 15; i++)
            {
                sb.Append(strs[r.Next(length - 1)]);
            }
            return sb.ToString();
        }
        #endregion

//生成时间戳，备用
 #region 时间戳生成 CreatenTimestamp()
        public static long CreatenTimestamp()
        {
            return (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
        }
        #endregion

//获取签名，这里的三个参数分别为前面生成的ticket，随机字符串以及时间戳
#region 获取签名 GetSignature()
        public static string GetSignature(string jsapi_ticket, string noncestr, long timestamp,string url)
        {

            var string1Builder = new StringBuilder();
            string1Builder.Append("jsapi_ticket=").Append(jsapi_ticket).Append("&")
                          .Append("noncestr=").Append(noncestr).Append("&")
                          .Append("timestamp=").Append(timestamp).Append("&")
                          .Append("url=").Append(url.IndexOf("#") >= 0 ? url.Substring(0, url.IndexOf("#")) : url);
            return SHA1(string1Builder.ToString());
        }
        #endregion


//最后就是SHA1的加密算法工具
 #region 加密签名算法 SHA1(content)
        //加密签名算法
        public static string SHA1(string content)
        {
            return SHA1(content, Encoding.UTF8);

        }
        //加密签名
        public static string SHA1(string content, Encoding encode)
        {
            try
            {
                SHA1 sha1 = new SHA1CryptoServiceProvider();
                byte[] bytes_in = encode.GetBytes(content);
                byte[] bytes_out = sha1.ComputeHash(bytes_in);
                sha1.Dispose();
                string result = BitConverter.ToString(bytes_out);
                result = result.Replace("-", "");
                return result;
            }
            catch (Exception ex)
            {
                throw new Exception("SHA1加密出错：" + ex.Message);
            }
        }  
        #endregion

总结

代码复制即可使用，需要注意的还是公众号的认证，域名的绑定，以及最后加密算法生成的字符串的正确性，少了哪一步，我们都不会得到一个正确的返回结果。

转载：https://blog.csdn.net/SugaryoTT/article/details/78558105

转载于:https://www.cnblogs.com/macT/p/11579449.html