我用asp.net模拟登陆微信公共平台后台

     string outdata = "";



        

        //新建一个CookieContainer来存放Cookie集合 



        HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);

        //新建一个HttpWebRequest 

       

        myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";

        myHttpWebRequest.ContentLength = indata.Length;

        myHttpWebRequest.Method = "POST";

        myHttpWebRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.172 Safari/537.22";

        myHttpWebRequest.CookieContainer = myCookieContainer;



        //设置HttpWebRequest的CookieContainer为刚才建立的那个myCookieContainer 

        Stream myRequestStream = myHttpWebRequest.GetRequestStream();

        StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));

        myStreamWriter.Write(indata, 0, indata.Length);

        //把数据写入HttpWebRequest的Request流 

        myStreamWriter.Close();

        myRequestStream.Close();

        //关闭打开对象 



        HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();

        //新建一个HttpWebResponse 

        myHttpWebResponse.Cookies = myCookieContainer.GetCookies(myHttpWebRequest.RequestUri);

        myCookieContainer.Add(myHttpWebResponse.Cookies);

        //获取一个包含url的Cookie集合的CookieCollection 

        Stream myResponseStream = myHttpWebResponse.GetResponseStream();

        StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("gb2312"));

        outdata = myStreamReader.ReadToEnd();

        JavaScriptSerializer js = new JavaScriptSerializer();

         ServiceMVC.Model.WeiXinResponse _model = new ServiceMVC.Model.WeiXinResponse();



         _model = js.Deserialize<ServiceMVC.Model.WeiXinResponse>(outdata);



        string strErrMsg =_model.ErrMsg;

        TOKEN = strErrMsg.Substring(strErrMsg.LastIndexOf("=")+1);

        

        //把数据从HttpWebResponse的Response流中读出 

        myStreamReader.Close();

        myResponseStream.Close();

        

      //  Console.WriteLine(outdata);

        //显示"登录" 



        //拿到了Cookie，再进行请求就能直接读取到登录后的内容了 

        myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);

        myHttpWebRequest.CookieContainer = myCookieContainer;//* 



        //刚才那个CookieContainer已经存有了Cookie,把它附加到HttpWebRequest中则能直接通过验证 

       myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();

        myHttpWebResponse.Cookies = myCookieContainer.GetCookies(myHttpWebRequest.RequestUri);

        myCookieContainer.Add(myHttpWebResponse.Cookies);

        myResponseStream = myHttpWebResponse.GetResponseStream();

        myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("gb2312"));

       outdata = myStreamReader.ReadToEnd();

        myStreamReader.Close();

        myResponseStream.Close();