【.NET】.NET MVC4 微信扫一扫功能实现-附全部代码

来源：互联网发布：雷神电脑怎么样知乎编辑：程序博客网时间：2024/05/20 12:24

写在前面的

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

<!DOCTYPE html><html><head>    <meta name="viewport" content="width=device-width" />    <title>Index</title>    <script src="http://res.wx.qq.com/open/js/jweixin-1.1.0.js"> </script>     <script src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>    <script src="~/Script/WxScanQRCode.js"></script>    <script>        wx.config({        debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。          appId: '@ViewBag.appid', // 必填，公众号的唯一标识          timestamp: '@ViewBag.timestamp', // 必填，生成签名的时间戳          nonceStr: '@ViewBag.noncestr', // 必填，生成签名的随机串          signature: '@ViewBag.sinature',// 必填，签名          jsApiList: ['checkJsApi',        //这里的接口在官方文档中都有涉及，我们只需要调用微信扫一扫即可                    //'chooseImage',                    //'previewImage',                    // 'uploadImage',                    // 'downloadImage',                    //  'getNetworkType',//网络状态接口                    //  'openLocation',//使用微信内置地图查看地理位置接口                    //  'getLocation', //获取地理位置接口                    //  'hideOptionMenu',//界面操作接口1                    //  'showOptionMenu',//界面操作接口2                    //  'closeWindow',  ////界面操作接口3                    //  'hideMenuItems',////界面操作接口4                    //  'showMenuItems',////界面操作接口5                    //  'hideAllNonBaseMenuItem',////界面操作接口6                    //  'showAllNonBaseMenuItem',////界面操作接口7                      'scanQRCode'// 微信扫一扫接口        ]          });        <!--开始扫描-->        function scan(){            wx.ready(function () {                var _scan = document.getElementById("url");                _scan.value = window.location.href;                wx.scanQRCode({                    needResult: 1,                    desc: 'scanQRCode desc',                    success: function (res) {                        alert(JSON.stringify(res));                    }                });            })        }    </script></head><body>    <div>        <input type="text" name ="url" id="url">        <button id="scanbutton" type="button" onclick="scan()">click here to scan</button>    </div></body></html>

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。

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