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;

+ }

+

+

+ ///

+ /// 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

+ ///

+ /// 时间

+ /// double

+ 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}