C#模拟登录的htmlHelper类

     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, HttpHeader header)
           {
               HttpWebRequest request = null;
               HttpWebResponse response = null;
               try
               {
                   CookieContainer cc = new CookieContainer();
                   request = (HttpWebRequest)WebRequest.Create(loginUrl);
                   request.Method = "GET";
                   request.ContentType = header.contentType;  

                   request.AllowAutoRedirect = false;
                   request.CookieContainer = cc;
                   request.KeepAlive = true;  

                   //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, , 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();
               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;
               }
           }  

           /// <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,string post, CookieContainer cookieContainer, HttpHeader header,Encoding en)
           {
               Thread.Sleep();
               HttpWebRequest myHttpWebRequest = null;
               HttpWebResponse httpWebResponse = null;
               try
               {
                   byte[] oneData = Encoding.Default.GetBytes(post);
                   Uri uri = new Uri(getUrl);
                   myHttpWebRequest = (HttpWebRequest)WebRequest.Create(uri);//请求的URL
                   myHttpWebRequest.CookieContainer = cookieContainer;//*发送COOKIE
                   myHttpWebRequest.Method = header.method;
                   myHttpWebRequest.ContentType = header.contentType;
                   myHttpWebRequest.ContentLength = oneData.Length;
                   Stream newMyStream = myHttpWebRequest.GetRequestStream();
                   newMyStream.Write(oneData, , oneData.Length);  

                   try
                   {
                       httpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
                       StreamReader sr = new StreamReader(httpWebResponse.GetResponseStream(), en);  

                       string str = sr.ReadToEnd();  

                       string msg = string.Empty;  

                       return str;
                   }
                   catch (Exception ex)
                   {
                       return string.Empty;
                   }
               }
               catch (Exception e)
               {
                   if (myHttpWebRequest != null) myHttpWebRequest.Abort();
                   if (httpWebResponse != null) httpWebResponse.Close();
                   return string.Empty;
               }
               return string.Empty;
           }  

           /// <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, string post, CookieContainer cookieContainer,out CookieContainer co, HttpHeader header, Encoding en)
           {
               Thread.Sleep();
               HttpWebRequest myHttpWebRequest = null;
               HttpWebResponse httpWebResponse = null;
               co = new CookieContainer();
               try
               {
                   byte[] oneData = Encoding.Default.GetBytes(post);
                   Uri uri = new Uri(getUrl);
                   myHttpWebRequest = (HttpWebRequest)WebRequest.Create(uri);//请求的URL
                   if (cookieContainer.Count > )
                   {
                       myHttpWebRequest.CookieContainer = cookieContainer;
                   }
                   else
                   {
                       myHttpWebRequest.CookieContainer = co;
                   }  

                   myHttpWebRequest.Method = header.method;
                   myHttpWebRequest.ContentType = header.contentType;
                   myHttpWebRequest.ContentLength = oneData.Length;
                   Stream newMyStream = myHttpWebRequest.GetRequestStream();
                   newMyStream.Write(oneData, , oneData.Length);  

                   try
                   {
                       httpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
                       StreamReader sr = new StreamReader(httpWebResponse.GetResponseStream(), en);  

                       httpWebResponse.Cookies = myHttpWebRequest.CookieContainer.GetCookies(myHttpWebRequest.RequestUri);
                       CookieCollection cook = httpWebResponse.Cookies;               //Cookie字符串格式
                       string strcrook = myHttpWebRequest.CookieContainer.GetCookieHeader(myHttpWebRequest.RequestUri);  

                       string str = sr.ReadToEnd();  

                       string msg = string.Empty;  

                       return str;
                   }
                   catch (Exception ex)
                   {
                       return string.Empty;
                   }
               }
               catch (Exception e)
               {
                   if (myHttpWebRequest != null) myHttpWebRequest.Abort();
                   if (httpWebResponse != null) httpWebResponse.Close();
                   return string.Empty;
               }
               return string.Empty;
           }  

           /// <summary>
           /// 获取Stream
           /// </summary>
           /// <param name="getUrl"></param>
           /// <param name="cookieContainer"></param>
           /// <param name="header"></param>
           /// <returns></returns>      

           public static Stream GetStream(string getUrl, CookieContainer cookieContainer, HttpHeader header)
           {
               Thread.Sleep();
               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 = header.referer;
                   httpWebRequest.Accept = header.accept;
                   httpWebRequest.UserAgent = header.userAgent;
                   httpWebRequest.Method = "GET";
                   httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                   Stream responseStream = httpWebResponse.GetResponseStream();  

                   return responseStream;
               }
               catch (Exception e)
               {
                   if (httpWebRequest != null) httpWebRequest.Abort();
                   if (httpWebResponse != null) httpWebResponse.Close();
                   return null;
               }
           }  

           public static Stream GetStream(string getUrl, CookieContainer cookieContainer, out CookieContainer co, HttpHeader header)
           {  

               Thread.Sleep();
               HttpWebRequest httpWebRequest = null;
               HttpWebResponse httpWebResponse = null;
               co = new CookieContainer();
               try
               {
                   httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(getUrl);
                   if (cookieContainer.Count > )
                   {
                       httpWebRequest.CookieContainer = cookieContainer;
                   }
                   else
                   {
                       httpWebRequest.CookieContainer = co;
                   }  

                   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();  

                   httpWebResponse.Cookies = httpWebRequest.CookieContainer.GetCookies(httpWebRequest.RequestUri);
                   CookieCollection cook = httpWebResponse.Cookies;               //Cookie字符串格式
                   string strcrook = httpWebRequest.CookieContainer.GetCookieHeader(httpWebRequest.RequestUri);  

                   return responseStream;
               }
               catch (Exception e)
               {
                   if (httpWebRequest != null) httpWebRequest.Abort();
                   if (httpWebResponse != null) httpWebResponse.Close();
                   return null;
               }
           }  

       }  

       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; }
           public string referer { get; set; }
       }