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）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，下载的时候注意点）/ / 通过get方式请求页面，传递一个实

2、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; request.UserAgent = Mozilla/4.0; re

3、quest.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(), Encoding.Default) cookie.Add(response.Cookies); /保存Cookies

4、list.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 StreamReader(st, System.Text.Encoding.Default) list.Ad

5、d(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 / / 验证码URL / Cookies值 / 保存位置/文件名 public static bool DowloadCheckImg(string Url, CookieContainer cookCon, string savePath) bool bol = true; HttpWebRequest webRequest = (HttpW

6、ebRequest)WebRequest.Create(Url); /属性配置 webRequest.AllowWriteStreamBuffering = true; webRequest.Credentials = System.Net.CredentialCache.DefaultCredentials; webRequest.MaximumResponseHeadersLength = -1; webRequest.Accept = image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-

7、flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*; webRequest.UserAgent = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322); webRequest.ContentType = application/x-www-form-urlencoded; webRequest.Method = GET; webRequest.Headers

8、.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 = (HttpWebResponse)webRequest.GetResponse() using (Stream sream = webResponse.GetResponseStream()

9、 List list = new List(); while (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; / / 发送相关数据至页面 / 进行登录操作 / 并保存cookie / / / / / public static Arr

10、ayList PostData(string postData, string postUrl, CookieContainer cookie) ArrayList list = new ArrayList(); HttpWebRequest request; HttpWebResponse response; ASCIIEncoding encoding = new ASCIIEncoding(); request = WebRequest.Create(postUrl) as HttpWebRequest; byte b = encoding.GetBytes(postData); req

11、uest.UserAgent = 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 /获取服务器返回的资源 using (response = request.GetResponse() as HttpWebResponse) using (StreamReader rea

12、der = 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(); catch (E