Asp.net 如何實現微信公眾號授權登入
第一個類：封裝好微信配置檔案
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Web;
using Newtonsoft.Json;
/// <summary>
/// 微信公眾號配置檔案
/// </summary>
///
public class Config : System.Web.SessionState.IRequiresSessionState
{
/// <summary>
/// 開發者ID
/// </summary>
public static string AppId { get; set; }
/// <summary>
/// 開發者密碼
/// </summary>
public static string AppSecret { get; set; }
/// <summary>
/// APP access_token 7200秒更新一次
/// </summary>
public static string access_token
{
get
{
try
{
if (HttpContext.Current.Session["$access_token"] == null)
{
using (WebClient wc = new WebClient())
{
wc.Encoding = System.Text.Encoding.UTF8;
string ret = wc.DownloadString(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", Config.AppId, Config.AppSecret));
Dictionary<string, object> o = JsonConvert.DeserializeObject<Dictionary<string, object>>(ret);
if (o.ContainsKey("errmsg")) return o["errmsg"].ToString();
HttpContext.Current.Session.Add("$access_token", o["access_token"].ToString());
HttpContext.Current.Session.Timeout = 7200;
return o["access_token"].ToString();
}
}
return HttpContext.Current.Session["$access_token"].ToString();
}
catch
{
throw;
}
}
}
}
第二個類：封裝好HTTP請求類
using System;
using System.Collections.Specialized;
using System.Net;
/// <summary>
/// 封裝好HTTP請求方便呼叫
/// </summary>
public class HttpService
{
public static string Get(string url)
{
using (WebClient c = new WebClient())
{
try
{
c.Encoding = System.Text.Encoding.UTF8;
return c.DownloadString(url);
}
catch (Exception)
{
throw;
}
}
}
public static string GetPost(string url, string parameters)
{
string ret = "";
using (WebClient c = new WebClient())
{
try
{
c.Encoding = System.Text.Encoding.UTF8;
byte[] data = System.Text.Encoding.UTF8.GetBytes(parameters);
c.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
c.Headers.Add("ContentLength", parameters.Length.ToString());
ret = System.Text.Encoding.UTF8.GetString(c.UploadData(url, "POST", data));
return ret;
}
catch (Exception)
{
throw;
}
}
}
public static string GetPost(string url, NameValueCollection nv)
{
using (WebClient c = new WebClient())
{
try
{
c.Encoding = System.Text.Encoding.UTF8;
return System.Text.Encoding.UTF8.GetString(c.UploadValues(url, "POST", nv));
}
catch (Exception)
{
throw;
}
}
}
}
第三個類：封裝好微信基礎頁，方便其他頁面繼承呼叫
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Newtonsoft.Json;
/// <summary>
/// WeiXin 的摘要說明
/// </summary>
public abstract class WeiXinPage : System.Web.UI.Page, System.Web.SessionState.IRequiresSessionState
{
protected sealed override void OnPreInit(EventArgs e)
{
if (isGuest)
{
getWxUser();
}
base.OnPreInit(e);
}
/// <summary>
/// 是否訪客身份 true:是 false:否
/// </summary>
public static bool isGuest
{
get
{
return HttpContext.Current.Session[_user] == null ? true : false;
}
}
private static string _user { get { return "$wxuser"; } }
private static string _code { get { return "$wxcode"; } }
private static string _AbsoluteUri { get { return HttpContext.Current.Request.Url.AbsoluteUri; } }
/// <summary>
/// 該路徑剔除微信Query的URL用於頁面重定向獲取最新的使用者資訊
/// </summary>
private static string _RawUrl
{
get
{
string url = HttpContext.Current.Request.Url.AbsoluteUri;
url = url.Replace(url.Substring(url.IndexOf("code"), url.IndexOf("STATE") + 5 - url.IndexOf("code")), "");
return url;
}
}
/// <summary>
/// 獲取微信使用者資訊
/// </summary>
private static Dictionary<string, object> getWxUser()
{
string code = HttpContext.Current.Request.QueryString.Get("code") ?? "",
url = "",
ret = "";
try
{
object user = HttpContext.Current.Session[_user];
if (code.Length == 0 && user == null)
{
/* 第一步: 使用者同意授權，獲取code*/
JumpUrl();
return null;
}
if (user != null) return JsonConvert.DeserializeObject<Dictionary<string, object>>(HttpContext.Current.Session[_user].ToString());
#region /*如果session中不存在user資訊則對接微信介面獲取使用者資訊*/
/* 第二步：通過code換取網頁授權access_token */
url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code"
, Config.AppId
, Config.AppSecret
, code);
ret = HttpService.Get(url);
Dictionary<string, string> o = JsonConvert.DeserializeObject<Dictionary<string, string>>(ret);
/* 第三步：根據access_token和openid拉取使用者資訊 */
url = string.Format("https://api.weixin.qq.com/sns/userinfo?access_token={0}&openid={1}&lang=zh_CN"
, o["access_token"]
, o["openid"]);
ret = HttpService.Get(url);
/*儲存使用者到Session*/
HttpContext.Current.Session[_user] = ret;
#endregion
return JsonConvert.DeserializeObject<Dictionary<string, object>>(HttpContext.Current.Session[_user].ToString());
}
catch
{
throw;
}
}
/// <summary>
/// 跳轉至微信授權登入頁
/// </summary>
private static void JumpUrl()
{
string url = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect"
, Config.AppId
, _AbsoluteUri);
HttpContext.Current.Response.Redirect(url, false);
}
/// <summary>
/// 微信使用者資訊
/// </summary>
public Dictionary<string, object> Data
{
get
{
return getWxUser();
}
}
}
演示：
public partial class _Default : WeiXinPage
{
protected override void OnLoad(EventArgs e)
{
Response.Write(JsonConvert.SerializeObject(Data));
base.OnLoad(e);
}
}