原文:

这篇文章是有关模拟登录网站方面的。

实现步骤；

1. 启用一个web会话
2. 发送模拟数据请求（POST或者GET）
3. 获取会话的CooKie 并根据该CooKie继续访问登录后的页面，获取后续访问的页面数据。

我们以登录人人网为例，首先需要分析人人网登录时POST的数据格式，这个可以通过IE9中只带的F12快捷键，调出开发人员工具。如下图：

 

通过开始捕获得到POST的地址和POST的数据

POST数据：

POST地址：

http://www.renren.com/PLogin.do

下面就是代码示例来得到登录后页面（http://guide.renren.com/guide）的数据

HTMLHelper类

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net;using System.IO;using System.Threading;namespace Test{   public class HTMLHelper    {       /// 
        /// 获取CooKie       /// 
       ///        ///        ///        /// 
               public static CookieContainer GetCooKie(string loginUrl, string postdata, HttpHeader header)       {           HttpWebRequest request = null;           HttpWebResponse response = null;           try           {               CookieContainer cc = new CookieContainer();               request = (HttpWebRequest)WebRequest.Create(loginUrl);               request.Method = header.method;               request.ContentType = header.contentType;               byte[] postdatabyte = Encoding.UTF8.GetBytes(postdata);               request.ContentLength = postdatabyte.Length;               request.AllowAutoRedirect = false;               request.CookieContainer = cc;               request.KeepAlive = true;               //提交请求               Stream stream;               stream = request.GetRequestStream();               stream.Write(postdatabyte, 0, postdatabyte.Length);               stream.Close();               //接收响应               response = (HttpWebResponse)request.GetResponse();               response.Cookies = request.CookieContainer.GetCookies(request.RequestUri);               CookieCollection cook = response.Cookies;               //Cookie字符串格式               string strcrook = request.CookieContainer.GetCookieHeader(request.RequestUri);               return cc;           }           catch (Exception ex)           {                              throw ex;           }       }       /// 
       /// 获取html       /// 
       ///        ///        ///        /// 
               public static string GetHtml(string getUrl, CookieContainer cookieContainer,HttpHeader header)       {           Thread.Sleep(1000);           HttpWebRequest httpWebRequest = null;           HttpWebResponse httpWebResponse = null;           try           {               httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(getUrl);               httpWebRequest.CookieContainer = cookieContainer;               httpWebRequest.ContentType = header.contentType;               httpWebRequest.ServicePoint.ConnectionLimit = header.maxTry;               httpWebRequest.Referer = getUrl;               httpWebRequest.Accept = header.accept;               httpWebRequest.UserAgent = header.userAgent;               httpWebRequest.Method = "GET";               httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();               Stream responseStream = httpWebResponse.GetResponseStream();               StreamReader streamReader = new StreamReader(responseStream, Encoding.UTF8);               string html = streamReader.ReadToEnd();               streamReader.Close();               responseStream.Close();               httpWebRequest.Abort();               httpWebResponse.Close();               return html;           }           catch (Exception e)           {               if (httpWebRequest != null) httpWebRequest.Abort();               if (httpWebResponse != null) httpWebResponse.Close();               return string.Empty;           }       }    }   public class HttpHeader   {       public string contentType { get; set; }       public string accept { get; set; }       public string userAgent { get; set; }       public string method{
      get;set;}       public int maxTry { get; set; }   }}

 

测试用例：

HttpHeader header = new HttpHeader();                header.accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/x-silverlight, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-silverlight-2-b1, */*";                header.contentType = "application/x-www-form-urlencoded";                header.method = "POST";                header.userAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)";                header.maxTry = 300;                string html = HTMLHelper.GetHtml("http://guide.renren.com/guide", HTMLHelper.GetCooKie("http://www.renren.com/PLogin.do",                    "email=aaa@163.com&password=111&icode=&origURL=http%3A%2F%2Fwww.renren.com%2Fhome&domain=renren.com&key_id=1&_rtk=90484476", header), header);                Console.WriteLine(html);               Console.ReadLine();

 

通过程序登录了网站后而直接进入登录后的页面。

首先还是发起一个启用一个web会话，然后发送模拟数据请求，获取会话的CooKie，再根据该CooKie将其写入到本地，通过程序直接打开登录后的页面。

该功能可用于无法修改第三方系统源代码而要做系统单点登录。

 

我们先在HTMLHelper类中添加一个方法：

1 /// 
 2 /// 获取CookieCollection 3 /// 
 4 ///  5 ///  6 ///  7 /// 
          8        public static CookieCollection GetCookieCollection(string loginUrl, string postdata, HttpHeader header) 9        {10            HttpWebRequest request = null;11            HttpWebResponse response = null;12            try13            {14                CookieContainer cc = new CookieContainer();15                request = (HttpWebRequest)WebRequest.Create(loginUrl);16                request.Method = header.method;17                request.ContentType = header.contentType;18                byte[] postdatabyte = Encoding.UTF8.GetBytes(postdata);19                request.ContentLength = postdatabyte.Length;20                request.AllowAutoRedirect = false;21                request.CookieContainer = cc;22                request.KeepAlive = true;23 24                //提交请求25                Stream stream;26                stream = request.GetRequestStream();27                stream.Write(postdatabyte, 0, postdatabyte.Length);28                stream.Close();29 30                //接收响应31                response = (HttpWebResponse)request.GetResponse();32                response.Cookies = request.CookieContainer.GetCookies(request.RequestUri);33 34                CookieCollection cook = response.Cookies;35                //Cookie字符串格式36                string strcrook = request.CookieContainer.GetCookieHeader(request.RequestUri);37 38                return cook;39            }40            catch (Exception ex)41            {42 43                throw ex;44            }45        }

再根据获取的CookieCollection写入本地，并打开登录后的页面

1   [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)] 2  3         public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData); 4  5  6   HttpHeader header = new HttpHeader(); 7                 header.accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/x-silverlight, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-silverlight-2-b1, */*"; 8                 header.contentType = "application/x-www-form-urlencoded"; 9                 header.method = "POST";10                 header.userAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)";11                 header.maxTry = 300;12 13 14  CookieCollection mycookie = HTMLHelper.GetCookieCollection("http://www.renren.com/PLogin.do",15                     "email=aaa%40163.com&password=111&icode=&origURL=http%3A%2F%2Fwww.renren.com%2Fhome&domain=renren.com&key_id=1&_rtk=90484476", header);16 17 18  foreach (Cookie cookie in mycookie) //将cookie设置为浏览的cookie  19                 {20 21                     InternetSetCookie(22 23                          "http://" + cookie.Domain.ToString(),24 25                          cookie.Name.ToString(),26 27                          cookie.Value.ToString() + ";expires=Sun,22-Feb-2099 00:00:00 GMT");28 29                 }30                 System.Diagnostics.Process.Start("http://guide.renren.com/guide");

这样即可直接通过程序打开登录后的页面：