微信开发

微信开发
这篇文章主要介绍了微信开发-ACCESS TOKEN 过期失效解决方案

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}