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 + "×tamp=" + 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;
+ }
+
+
+ ///
+ /// StreamWriter写入文件方法
+ ///
+ 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();
+ }
+
+
+
+
+ ///
+ /// 将c# DateTime时间格式转换为Unix时间戳格式
+ ///
+ ///
+ ///
+ 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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