c# 使用 HttpWebRequest模拟登陆(附带验证码)

1、c# 使用 HttpWebRequest模拟登陆(附带验证码)c# 使用HttpWebRequest模拟登陆（附带验证码）在C#中，可以使用HttpWebRequest进行相关的模拟登陆，登陆后进行相关的操作，比如抓取数据，页面分析，制作相关登陆助手等等。先说下流程1.使用httpwebrequest先进入你要登录的网站，获取cookie2.使用第一步获取的cookie到验证码的网页将验证码下载下来。3.使用Post数据发送至网站。如果有cookie则继续保存。4.使用第三步的cookie登陆相关网页操作。获取相关数据可以使用抓包工具进行抓取，如httpwatch。（网上下载的好多都有病毒，下

2、载的时候注意点）/ / 通过get方式请求页面，传递一个实例化的cookieContainer/ / / / public static ArrayList GetHtmlData(string postUrl, CookieContainer cookie)HttpWebRequest request;HttpWebResponse response;ArrayList list = new ArrayList();request = WebRequest.Create(postUrl) as HttpWebRequest;request.Method = GET;http:/www.wen

3、/doc/07bcaa853186bceb19e8bbc9.htmlerAgent = Mozilla/4.0;request.CookieContainer = cookie;request.KeepAlive = true;request.CookieContainer = cookie;try/获取服务器返回的资源using (response = (HttpWebResponse)request.GetResponse()using (StreamReader reader = new StreamReader(response.GetResponseStream(

4、), Encoding.Default)cookie.Add(response.Cookies);/保存Cookieslist.Add(cookie);list.Add(reader.ReadToEnd();list.Add(Guid.NewGuid().ToString();/图片名catch (WebException ex)list.Clear();list.Add(发生异常/n/r);WebResponse wr = ex.Response;using (Stream st = wr.GetResponseStream()using (StreamReader sr = new Str

5、eamReader(st, System.Text.Encoding.Default)list.Add(sr.ReadToEnd();catch (Exception ex)list.Clear();list.Add(5);list.Add(发生异常： + ex.Message);return list;/ / 下载验证码图片并保存到本地/ / / / public static bool DowloadCheckImg(string Url, CookieContainer cookCon, string savePath)bool bol = true;HttpWebRequest web

6、Request = (HttpWebRequest)WebRequest.Create(Url);/属性配置webRequest.AllowWriteStreamBuffering = true;webRequest.Credentials = /doc/07bcaa853186bceb19e8bbc9.html.CredentialCache.DefaultCredentials;webRequest.MaximumResponseHeadersLength = -1;webRequest.Accept = image/gif, image/x-

7、xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*;/doc/07bcaa853186bceb19e8bbc9.htmlerAgent = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322);web

8、Request.ContentType = application/x-www-form-urlencoded;webRequest.Method = GET;webRequest.Headers.Add(Accept-Language, zh-cn);webRequest.Headers.Add(Accept-Encoding, gzip,deflate);webRequest.KeepAlive = true;webRequest.CookieContainer = cookCon;try/获取服务器返回的资源using (HttpWebResponse webResponse = (Ht

9、tpWebResponse)webRequest.GetResponse()using (Stream sream = webResponse.GetResponseStream()Listwhile (true)int data = sream.ReadByte();if (data = -1)break;list.Add(byte)data);File.WriteAllBytes(savePath, list.ToArray();catch (WebException ex)bol = false;catch (Exception ex)bol = false;return bol;/ /

10、 发送相关数据至页面/ 进行登录操作/ 并保存cookie/ / / / / public static ArrayList PostData(string postData, string postUrl, CookieContainer cookie)ArrayList list = new ArrayList();HttpWebRequest request;HttpWebResponse response;ASCIIEncoding encoding = new ASCIIEncoding();request = WebRequest.Create(postUrl) as HttpWe

11、bRequest;byte b = encoding.GetBytes(postData);/doc/07bcaa853186bceb19e8bbc9.htmlerAgent = Mozilla/4.0;request.Method = POST;request.CookieContainer = cookie;request.ContentLength = b.Length;using (Stream stream = request.GetRequestStream()stream.Write(b, 0, b.Length);try/获取服务器

12、返回的资源using (response = request.GetResponse() as HttpWebResponse)using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8)if (response.Cookies.Count 0)cookie.Add(response.Cookies);list.Add(cookie);list.Add(reader.ReadToEnd();catch (WebException wex)WebResponse wr = wex.Response;using (Stream st = wr.GetResponseStream()using (StreamReader sr = new StreamReader(st, System.Text.Encoding.Default)list.Add(sr.ReadToEnd();c