MVC 微信开发获取用户OpenID

浅苍蓝 2017-08-11

MVC微信开发基础:获取微信用户OpenId

第一次开发微信版网页,对最重要的获取微信OpenId,特此记录下来

1.首先得有appid和appsecret

1   public class WeiXin {
 2 
 3         public static string appid {
 4             get {
 5                 string _appid = "wx3xxxxxxxxxxxxxxx";
 6                 return _appid;
 7             }
 8         }
 9         public static string aseret {
10             get {
11                 string appsecret = "b6719276d539796d94bxxxxxxxxxxxxxxx";
12                 return appsecret;
13             }
14         }
15 
16 }

2.只获取用户的openID,,在确保微信公众账号拥有授权作用域(scope参数)的权限的前提下(服务号获得高级接口后,默认拥有scope参数中的snsapi_base和snsapi_userinfo),引导关注者打开如下页面,以snsapi_base为scope发起的网页授权,并且是静默授权并自动跳转到回调页的。用户感知的就是直接进入了回调页(下面代码中的url参数就是回调页,静态的可以写成:string url = https://wx.baidu.com/controller/GetOpenId,注意URL需要进行HttpUtility.UrlEncode(url)编码,还有回调页的域名需要和微信公众号里面设置的回调域名相同)

1 public class ApplyVIPController : Controller 2 { 3 4 // GET: /ApplyVIP/ 5 6 public ActionResult Index(string url) 7 { 8 string _url = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_base&state={2}#wechat_redirect", 9 WeiXin.appid, 10 url,//回调页URL 11 Guid.NewGuid().ToString("N")); 12 return Redirect(_url);//这里微信会自动取出回调页URL,并且跳转到该url所属的页面 13 }

3.获取code,并且通过code获取Openid,正确时返回的JSON数据包如下:{ "access_token":"ACCESS_TOKEN", "expires_in":7200, "refresh_token":"REFRESH_TOKEN", "openid":"OPENID", "scope":"SCOPE" },这里面就包含了所需要的OPENID1 //controller 2 public string GetOpenId() { 3 string code = requset.querystring["code"]; 4 string openid = ""; 5 string json = ""; 6 string url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code "//通过appid,appaseret,code 7 , WeiXin.appid, WeiXin.aseret, code); 8 HttpQuery.Get(url, null, msg => { 9 json = msg; 10 }); 11 JObject job = (JObject)JsonConvert.DeserializeObject(json); 12 openid = job["openid"].ToString(); 13 return openid; 14 }

4.请求获取Openid的httpquery.get()方法

1 public class HttpQuery { 2 private static readonly string DefaultUserAgent = 3 "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"; 4 5 public static void Get(string url, object data, Action<string> callback) { 6 IDictionary<string, string> parameters = Getparameters(data); 7 8 if (!(parameters == null || parameters.Count == 0)) { 9 url += "?"; 10 foreach (var item in parameters) { 11 url += item.Key + "=" + item.Value + "&"; 12 } 13 } 14 CreateGetHttpResponse(url, null, null, null, callback); 15 } 16 /// <summary> 17 /// 创建GET方式的HTTP请求 18 /// </summary> 19 /// <param name="url">请求的URL</param> 20 /// <param name="timeout">请求的超时时间</param> 21 /// <param name="userAgent">请求的客户端浏览器信息,可以为空</param> 22 /// <param name="cookies">随同HTTP请求发送的Cookie信息,如果不需要身份验证可以为空</param> 23 /// <returns></returns> 24 private static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent, 25 CookieCollection cookies, Action<string> callback, string encoding = "utf-8") { 26 if (string.IsNullOrEmpty(url)) { 27 return null; 28 //throw new ArgumentNullException("url"); 29 } 30 try { 31 HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; 32 request.Method = "GET"; 33 request.UserAgent = DefaultUserAgent; 34 if (!string.IsNullOrEmpty(userAgent)) { 35 request.UserAgent = userAgent; 36 } 37 if (timeout.HasValue) { 38 request.Timeout = timeout.Value; 39 } 40 if (cookies != null) { 41 request.CookieContainer = new CookieContainer(); 42 request.CookieContainer.Add(cookies); 43 } 44 45 HttpWebResponse httpWebResponse = request.GetResponse() as HttpWebResponse; 46 47 StreamReader reader = new StreamReader(httpWebResponse.GetResponseStream(), 48 System.Text.Encoding.GetEncoding(encoding)); 49 50 string html = ""; 51 //获取请求到的数据 52 html = reader.ReadToEnd(); 53 //关闭 54 httpWebResponse.Close(); 55 reader.Close(); 56 57 callback(html); 58 return httpWebResponse; 59 } 60 } catch { 61 callback(null); 62 } 63 return null; 64 } 65 66 }

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