HttpWebRequest实战（阿里巴巴登录）

            string loginUrl = "https://login.alibaba.com/xman/xlogin.js";      

            string pd = "alibaba";

            string u_token = "";

            string dmtrack_pageid = Guid.NewGuid().ToString();

            string xloginPassport = HttpUtility.UrlEncode(txtUserName.Text);

            string xloginPassword = "";



            Base64Class b=new  Base64Class();

            sbyte[] sbyteData =b.md5(txtPassword.Text);

            string s = b.converttobase64(sbyteData);

            string pwd = FormsAuthentication.HashPasswordForStoringInConfigFile(s, "MD5").ToLower(); 

            pwd = FormsAuthentication.HashPasswordForStoringInConfigFile(pwd, "MD5").ToLower();

            pwd = FormsAuthentication.HashPasswordForStoringInConfigFile(pwd, "MD5").ToLower();

            pwd = FormsAuthentication.HashPasswordForStoringInConfigFile(pwd, "MD5").ToLower();



            xloginPassword = pwd;





            IDictionary<string, string> parameters = new Dictionary<string, string>();

            parameters.Add("pd", pd);

            parameters.Add("u_token", u_token);

            parameters.Add("xloginPassport", xloginPassport);

            parameters.Add("xloginPassword", xloginPassword);

            parameters.Add("dmtrack_pageid", dmtrack_pageid);





            //Post登录页

            HttpWebResponse response = HttpHelper.HttpPostResponse(loginUrl, parameters, null, null, Encoding.GetEncoding("gb2312"),"");

           





            StreamReader sr = new StreamReader(response.GetResponseStream());

           

            string result= sr.ReadToEnd();

           

            sr.Close();



            if (result.Contains("xlogin_failed"))

            {

                MessageBox.Show("密码错误!");

                if (result.Contains("yes"))

                {

                    MessageBox.Show("需要图片验证码");

                }

                return;

            }

            //获取登录页cookie

            CurrentCookie= response.Headers["Set-Cookie"];           



            //获取登录代理页URL

            string proxyUrl = result.Substring(result.IndexOf("https://login.alibaba.com"), result.IndexOf("],") - 1-result.IndexOf("https://login.alibaba.com"));

             //请求代理页

            response = HttpHelper.HttpGetResponse(proxyUrl, 0, string.Empty, CurrentCookie);



            Stream data = response.GetResponseStream();

            byte[] bData = new byte[4];

            data.Read(bData, 0, 4);            

            sr = new StreamReader(data,Encoding.UTF8);

            //登录成功了，呵呵

            result = Encoding.UTF8.GetString(bData) + sr.ReadToEnd();

作者：Louja
出处：http://loujady.cnblogs.com
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