微信开发-ACCESS TOKEN 过期失效解决方案

起因：因为access_token的重要性，开发过微信的都知道，但是他有自己的生命周期,官方解释为:"有效期为7200秒",一天调用2000次。流量一高，就over了，没办法，龙哥不帮我们解决问题，我们就要自己解决，不能等死。

解决思路很简单：建立公共access token数据，有效期内不重新创建access_token。

解决方案：1、微信类库：有效期内直接读取access token数据文件中的json数据，过期失效，重新获取并创建新的access token数据文件2、数据文件：存放有效的access token数据，具体有：access_token.json和jsapi_ticket.json

核心代码如下：

Index: wxjsSDK.cs  ===================================================================  --- wxjsSDK.cs	(revision 0)  +++ wxjsSDK.cs	(revision 1)  @@ -0,0 +1,209 @@  +using System;  +using System.Collections.Generic;  +using System.Web;  +using System.IO;  +using System.Security.Cryptography;  +using System.Runtime.Serialization.Json;  +using System.Runtime.Serialization;  +using System.Net;  +using System.Runtime.Serialization.Formatters.Binary;  +using System.Text;   +  +namespace JR.Common  +{  +    public class wxjsSDK  +    {  +        private string appId;   +        private string appSecret;  +  +  +        public wxjsSDK(string appId, string appSecret)   +        {   +            this.appId = appId;   +            this.appSecret = appSecret;   +        }   +     +     +     +        //得到数据包，返回使用页面   +        public System.Collections.Hashtable getSignPackage()   +        {   +            string jsapiTicket = getJsApiTicket();   +            string url = HttpContext.Current.Request.Url.ToString(); //"http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";   +            string timestamp = Convert.ToString(ConvertDateTimeInt(DateTime.Now));   +            string nonceStr = createNonceStr();   +            // 这里参数的顺序要按照 key 值 ASCII 码升序排序   +            string rawstring = "jsapi_ticket=" + jsapiTicket + "&noncestr=" + nonceStr + "&timestamp=" + timestamp + "&url=" + url + "";   +            string signature = SHA1_Hash(rawstring);   +            var signPackage = new System.Collections.Hashtable();   +            signPackage.Add("appId", appId);   +            signPackage.Add("nonceStr", nonceStr);   +            signPackage.Add("timestamp", timestamp);   +            signPackage.Add("url", url);   +            signPackage.Add("signature", signature);   +            signPackage.Add("rawString", rawstring);   +            return signPackage;   +        }   +     +     +        //创建随机字符串   +        private string createNonceStr()  +        {  +            int length = 16;  +            string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";  +            string str = "";  +            var rad = new Random();  +            for (int i = 0; i < length; i++)  +            {  +                str += chars.Substring(rad.Next(0, chars.Length - 1), 1);  +            }  +            return str;  +        }  +  +  +        //得到ticket 如果文件里时间 超时则重新获取   +        private string getJsApiTicket()  +        {  +            string ticket = "";  +            // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例   +            string path = HttpContext.Current.Server.MapPath(@"/log/jssdk/jsapi_ticket.json");  +            if (!File.Exists(path))  +            {  +                File.Create(path).Close();  +            }  +            StreamReader sr = new StreamReader(path, System.Text.Encoding.Default);  +            string filecontent = sr.ReadToEnd();  +            CommonJsonModel jsonModel = null;  +            if (!string.IsNullOrEmpty(filecontent))  +            {  +                jsonModel = new CommonJsonModel(filecontent);  +            }  +            sr.Close();  +            sr.Dispose();  +            if (jsonModel == null || int.Parse(jsonModel.GetValue("expires_in")) < ConvertDateTimeInt(DateTime.Now))  +            {  +                string accessToken = getAccessToken();  +                string url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=" + accessToken;  +                jsonModel = new CommonJsonModel(httpGet(url));  +                ticket = jsonModel.GetValue("ticket");  +                if (ticket != "")  +                {  +                    string json = "{\"ticket\":\"" + ticket + "\",\"expires_in\":" + (ConvertDateTimeInt(DateTime.Now) + 7000) + "}";  +                    StreamWriterMetod(json, path);  +                }  +            }  +            else  +            {  +                ticket = jsonModel.GetValue("ticket");  +            }  +            return ticket;  +        }  +  +  +        //得到accesstoken 如果文件里时间 超时则重新获取   +        private string getAccessToken()  +        {  +            // access_token 应该全局存储与更新，以下代码以写入到文件中做示例   +            string access_token = "";  +            string path = HttpContext.Current.Server.MapPath(@"/log/jssdk/access_token.json");  +            if (!File.Exists(path))  +            {  +                File.Create(path).Close();  +            }  +            StreamReader sr = new StreamReader(path, System.Text.Encoding.Default);  +            string filecontent = sr.ReadToEnd();  +            CommonJsonModel jsonModel = null;  +            if (!string.IsNullOrEmpty(filecontent))  +            {  +                jsonModel = new CommonJsonModel(filecontent);  +            }  +            sr.Close();  +            sr.Dispose();  +            if (jsonModel == null || int.Parse(jsonModel.GetValue("expires_in")) < ConvertDateTimeInt(DateTime.Now))  +            {  +                string url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appId +  +                             "&secret=" + appSecret + "";  +                jsonModel = new CommonJsonModel(httpGet(url));  +                access_token = jsonModel.GetValue("access_token");  +                if (access_token != "")  +                {  +                    string json = "{\"access_token\":\"" + access_token + "\",\"expires_in\":" + (ConvertDateTimeInt(DateTime.Now) + 7000) + "}";  +                    StreamWriterMetod(json, path);  +                }  +            }  +            else  +            {  +                access_token = jsonModel.GetValue("access_token");  +            }  +            return access_token;  +        }  +  +  +        //发起一个http请球，返回值   +        private string httpGet(string url)   +        {  +            try  +            {  +                var MyWebClient = new WebClient();  +                MyWebClient.Credentials = CredentialCache.DefaultCredentials; //获取或设置用于向Internet资源的请求进行身份验证的网络凭据   +                Byte[] pageData = MyWebClient.DownloadData(url); //从指定网站下载数据   +                string pageHtml = System.Text.Encoding.Default.GetString(pageData);//如果获取网站页面采用的是GB2312，则使用这句               +                //string pageHtml = Encoding.UTF8.GetString(pageData); //如果获取网站页面采用的是UTF-8，则使用这句   +                return pageHtml;  +            }  +            catch (WebException webEx)  +            {  +                Console.WriteLine(webEx.Message.ToString());  +                return null;  +            }  +        }   +     +     +        //SHA1哈希加密算法   +        private string SHA1_Hash(string str_sha1_in)   +        {   +            SHA1 sha1 = new SHA1CryptoServiceProvider();   +            byte[] bytes_sha1_in = System.Text.UTF8Encoding.Default.GetBytes(str_sha1_in);   +            byte[] bytes_sha1_out = sha1.ComputeHash(bytes_sha1_in);   +            string str_sha1_out = BitConverter.ToString(bytes_sha1_out);   +            str_sha1_out = str_sha1_out.Replace("-", "").ToLower();   +            return str_sha1_out;   +        }   +     +     +        /// <summary>   +        /// StreamWriter写入文件方法   +        /// </summary>   +        private void StreamWriterMetod(string str, string patch)   +        {  +            FileStream stream = new FileStream(patch, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Delete | FileShare.ReadWrite);  +            StreamWriter writer = new StreamWriter(stream);  +            writer.WriteLine(str);  +            stream.Flush();  +            writer.Close();  +            stream.Close();  +            stream.Dispose();  +            writer.Dispose();  +        }   +    +     +     +     +        /// <summary>   +        /// 将c# DateTime时间格式转换为Unix时间戳格式   +        /// </summary>   +        /// <param name="time">时间</param>   +        /// <returns>double</returns>   +        private int ConvertDateTimeInt(System.DateTime time)   +        {   +            int intResult = 0;   +            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));   +            intResult = Convert.ToInt32((time - startTime).TotalSeconds);   +            return intResult;   +        }   +  +  +    }  +  +  +}        access_token.json  {"access_token":"4H14BVCUrAxxxxxxxxxxxxWeLu-zKETaBYqsoKFjsHZDc3xOwc-m43WDw2HjzxEkng2nC7iJuHydNt5PqRDY7HCoAU4lmuaPoYsIQHdW9kA","expire_time":1428599121}    access_token.json  {"jsapi_ticket":"bxLdikRXVbTPdHSM05e5u1wgoccccccccccccccccccccccccccccc11FFzYsiqbXZN0SDGN6Dnksnt2Q","expire_time":1428599122}

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