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这篇文章是有关模拟登录网站方面的。 实现步骤； 启用一个web会话 发送模拟数据请求（POST或者GET） 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： email=aaa@163.com&password=111&icode=&origURL=http%3A%2F%2Fwww.renren.com%
2Fhome&domain=renren.com&key_id=1&_rtk=90484476 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
{ /// <summary>
/// 获取CooKie /// </summary>
/// <param name="loginUrl"></param>
/// <param name="postdata"></param>
/// <param name="header"></param>
/// <returns></returns> 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;
}
} /// <summary>
/// 获取html /// </summary>
/// <param name="getUrl"></param>
/// <param name="cookieContainer"></param>
/// <param name="header"></param>
/// <returns></returns> 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 /// <summary> 2 /// 获取CookieCollection 3 /// </summary> 4 /// <param name="loginUrl"></param> 5 /// <param name="postdata"></param> 6 /// <param name="header"></param> 7 /// <returns></returns> 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");复制代码 这样即可直接通过程序打开登录后的页面： 
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