c# 模拟登陆（带验证码） c# 使用 HttpWebRequest模拟登陆（附带验证码）

近来发现这个挺有用，从网上搜集过来一系列，参考参考。

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cookie

2.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）

1。

///<summary>
///通过get方式请求页面，传递一个实例化的cookieContainer
///</summary>
///<paramname="postUrl"></param>
///<paramname="cookie"></param>
///<returns></returns>
publicstaticArrayListGetHtmlData(stringpostUrl,CookieContainercookie)
{
HttpWebRequestrequest;
HttpWebResponseresponse;
ArrayListlist=newArrayList();
request=WebRequest.Create(postUrl)asHttpWebRequest;
request.Method="GET";
request.UserAgent="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(StreamReaderreader=newStreamReader(response.GetResponseStream(),Encoding.Default))
{
cookie.Add(response.Cookies);
//保存Cookies
list.Add(cookie);
list.Add(reader.ReadToEnd());
list.Add(Guid.NewGuid().ToString());//图片名
}
}
}
catch(WebExceptionex)
{
list.Clear();
list.Add("发生异常/n/r");
WebResponsewr=ex.Response;
using(Streamst=wr.GetResponseStream())
{
using(StreamReadersr=newStreamReader(st,System.Text.Encoding.Default))
{
list.Add(sr.ReadToEnd());
}
}
}
catch(Exceptionex)
{
list.Clear();
list.Add("5");
list.Add("发生异常："+ex.Message);
}
returnlist;
}

        /// <summary>        /// 通过get方式请求页面，传递一个实例化的cookieContainer        /// </summary>        /// <param name="postUrl"></param>        /// <param name="cookie"></param>        /// <returns></returns>        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";            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(), Encoding.Default))                    {                        cookie.Add(response.Cookies);                        //保存Cookies                        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.Add(sr.ReadToEnd());                    }                }            }            catch (Exception ex)            {                list.Clear();                list.Add("5");                list.Add("发生异常：" + ex.Message);            }            return list;        }

2.下载验证码，保存在本地。

///<summary>
///下载验证码图片并保存到本地
///</summary>
///<paramname="Url">验证码URL</param>
///<paramname="cookCon">Cookies值</param>
///<paramname="savePath">保存位置/文件名</param>
publicstaticboolDowloadCheckImg(stringUrl,CookieContainercookCon,stringsavePath)
{
boolbol=true;
HttpWebRequestwebRequest=(HttpWebRequest)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-flash,application/vnd.ms-excel,application/vnd.ms-powerpoint,application/msword,*/*";
webRequest.UserAgent="Mozilla/4.0(compatible;MSIE6.0;WindowsNT5.1;SV1;Maxthon;.NETCLR1.1.4322)";
webRequest.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(HttpWebResponsewebResponse=(HttpWebResponse)webRequest.GetResponse())
{
using(Streamsream=webResponse.GetResponseStream())
{
List<byte>list=newList<byte>();
while(true)
{
intdata=sream.ReadByte();
if(data==-1)
break;
list.Add((byte)data);
}
File.WriteAllBytes(savePath,list.ToArray());
}
}
}
catch(WebExceptionex)
{
bol=false;
}
catch(Exceptionex)
{
bol=false;
}
returnbol;
}

/// <summary>        /// 下载验证码图片并保存到本地        /// </summary>        /// <param name="Url">验证码URL</param>        /// <param name="cookCon">Cookies值</param>        /// <param name="savePath">保存位置/文件名</param>        public static bool DowloadCheckImg(string Url, CookieContainer cookCon, string savePath)        {            bool bol = true;            HttpWebRequest webRequest = (HttpWebRequest)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-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.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())                    {                        List<byte> list = new List<byte>();                        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;        }

3。发送post数据

///<summary>
///发送相关数据至页面
///进行登录操作
///并保存cookie
///</summary>
///<paramname="postData"></param>
///<paramname="postUrl"></param>
///<paramname="cookie"></param>
///<returns></returns>
publicstaticArrayListPostData(stringpostData,stringpostUrl,CookieContainercookie)
{
ArrayListlist=newArrayList();
HttpWebRequestrequest;
HttpWebResponseresponse;
ASCIIEncodingencoding=newASCIIEncoding();
request=WebRequest.Create(postUrl)asHttpWebRequest;
byte[]b=encoding.GetBytes(postData);
request.UserAgent="Mozilla/4.0";
request.Method="POST";
request.CookieContainer=cookie;
request.ContentLength=b.Length;
using(Streamstream=request.GetRequestStream())
{
stream.Write(b,0,b.Length);
}

try
{
//获取服务器返回的资源
using(response=request.GetResponse()asHttpWebResponse)
{
using(StreamReaderreader=newStreamReader(response.GetResponseStream(),Encoding.UTF8))
{
if(response.Cookies.Count>0)
cookie.Add(response.Cookies);
list.Add(cookie);
list.Add(reader.ReadToEnd());
}
}
}
catch(WebExceptionwex)
{
WebResponsewr=wex.Response;
using(Streamst=wr.GetResponseStream())
{
using(StreamReadersr=newStreamReader(st,System.Text.Encoding.Default))
{
list.Add(sr.ReadToEnd());
}
}
}
catch(Exceptionex)
{
list.Add("发生异常/n/r"+ex.Message);
}
returnlist;
}

        /// <summary>        /// 发送相关数据至页面        /// 进行登录操作        /// 并保存cookie        /// </summary>        /// <param name="postData"></param>        /// <param name="postUrl"></param>        /// <param name="cookie"></param>        /// <returns></returns>        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 HttpWebRequest;            byte[] b = encoding.GetBytes(postData);            request.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 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());                    }                }            }            catch (Exception ex)            {                list.Add("发生异常/n/r"+ex.Message);            }            return list;        }

4。就是第三步请求的链接地址换一个就行了

好了

以上核心代码已经贴出了

具体实现需要靠你们按照你们自己的逻辑

作者还说：

还有一些header能不写就不写，因为2天前一直在获取返回response这地方报500错误。

找了N多代码，看了N多资料都不可以。最后将一些header注释掉就可以了，真郁闷。

我马上试验，等有做出成熟的例子，再写新文章提供给大家！

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cookie

2.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）

1。

///<summary>
///通过get方式请求页面，传递一个实例化的cookieContainer
///</summary>
///<paramname="postUrl"></param>
///<paramname="cookie"></param>
///<returns></returns>
publicstaticArrayListGetHtmlData(stringpostUrl,CookieContainercookie)
{
HttpWebRequestrequest;
HttpWebResponseresponse;
ArrayListlist=newArrayList();
request=WebRequest.Create(postUrl)asHttpWebRequest;
request.Method="GET";
request.UserAgent="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(StreamReaderreader=newStreamReader(response.GetResponseStream(),Encoding.Default))
{
cookie.Add(response.Cookies);
//保存Cookies
list.Add(cookie);
list.Add(reader.ReadToEnd());
list.Add(Guid.NewGuid().ToString());//图片名
}
}
}
catch(WebExceptionex)
{
list.Clear();
list.Add("发生异常/n/r");
WebResponsewr=ex.Response;
using(Streamst=wr.GetResponseStream())
{
using(StreamReadersr=newStreamReader(st,System.Text.Encoding.Default))
{
list.Add(sr.ReadToEnd());
}
}
}
catch(Exceptionex)
{
list.Clear();
list.Add("5");
list.Add("发生异常："+ex.Message);
}
returnlist;
}

        /// <summary>        /// 通过get方式请求页面，传递一个实例化的cookieContainer        /// </summary>        /// <param name="postUrl"></param>        /// <param name="cookie"></param>        /// <returns></returns>        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";            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(), Encoding.Default))                    {                        cookie.Add(response.Cookies);                        //保存Cookies                        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.Add(sr.ReadToEnd());                    }                }            }            catch (Exception ex)            {                list.Clear();                list.Add("5");                list.Add("发生异常：" + ex.Message);            }            return list;        }

2.下载验证码，保存在本地。

///<summary>
///下载验证码图片并保存到本地
///</summary>
///<paramname="Url">验证码URL</param>
///<paramname="cookCon">Cookies值</param>
///<paramname="savePath">保存位置/文件名</param>
publicstaticboolDowloadCheckImg(stringUrl,CookieContainercookCon,stringsavePath)
{
boolbol=true;
HttpWebRequestwebRequest=(HttpWebRequest)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-flash,application/vnd.ms-excel,application/vnd.ms-powerpoint,application/msword,*/*";
webRequest.UserAgent="Mozilla/4.0(compatible;MSIE6.0;WindowsNT5.1;SV1;Maxthon;.NETCLR1.1.4322)";
webRequest.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(HttpWebResponsewebResponse=(HttpWebResponse)webRequest.GetResponse())
{
using(Streamsream=webResponse.GetResponseStream())
{
List<byte>list=newList<byte>();
while(true)
{
intdata=sream.ReadByte();
if(data==-1)
break;
list.Add((byte)data);
}
File.WriteAllBytes(savePath,list.ToArray());
}
}
}
catch(WebExceptionex)
{
bol=false;
}
catch(Exceptionex)
{
bol=false;
}
returnbol;
}

/// <summary>        /// 下载验证码图片并保存到本地        /// </summary>        /// <param name="Url">验证码URL</param>        /// <param name="cookCon">Cookies值</param>        /// <param name="savePath">保存位置/文件名</param>        public static bool DowloadCheckImg(string Url, CookieContainer cookCon, string savePath)        {            bool bol = true;            HttpWebRequest webRequest = (HttpWebRequest)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-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.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())                    {                        List<byte> list = new List<byte>();                        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;        }

3。发送post数据

///<summary>
///发送相关数据至页面
///进行登录操作
///并保存cookie
///</summary>
///<paramname="postData"></param>
///<paramname="postUrl"></param>
///<paramname="cookie"></param>
///<returns></returns>
publicstaticArrayListPostData(stringpostData,stringpostUrl,CookieContainercookie)
{
ArrayListlist=newArrayList();
HttpWebRequestrequest;
HttpWebResponseresponse;
ASCIIEncodingencoding=newASCIIEncoding();
request=WebRequest.Create(postUrl)asHttpWebRequest;
byte[]b=encoding.GetBytes(postData);
request.UserAgent="Mozilla/4.0";
request.Method="POST";
request.CookieContainer=cookie;
request.ContentLength=b.Length;
using(Streamstream=request.GetRequestStream())
{
stream.Write(b,0,b.Length);
}

try
{
//获取服务器返回的资源
using(response=request.GetResponse()asHttpWebResponse)
{
using(StreamReaderreader=newStreamReader(response.GetResponseStream(),Encoding.UTF8))
{
if(response.Cookies.Count>0)
cookie.Add(response.Cookies);
list.Add(cookie);
list.Add(reader.ReadToEnd());
}
}
}
catch(WebExceptionwex)
{
WebResponsewr=wex.Response;
using(Streamst=wr.GetResponseStream())
{
using(StreamReadersr=newStreamReader(st,System.Text.Encoding.Default))
{
list.Add(sr.ReadToEnd());
}
}
}
catch(Exceptionex)
{
list.Add("发生异常/n/r"+ex.Message);
}
returnlist;
}

        /// <summary>        /// 发送相关数据至页面        /// 进行登录操作        /// 并保存cookie        /// </summary>        /// <param name="postData"></param>        /// <param name="postUrl"></param>        /// <param name="cookie"></param>        /// <returns></returns>        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 HttpWebRequest;            byte[] b = encoding.GetBytes(postData);            request.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 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());                    }                }            }            catch (Exception ex)            {                list.Add("发生异常/n/r"+ex.Message);            }            return list;        }

4。就是第三步请求的链接地址换一个就行了

好了

以上核心代码已经贴出了

具体实现需要靠你们按照你们自己的逻辑

作者还说：

还有一些header能不写就不写，因为2天前一直在获取返回response这地方报500错误。

找了N多代码，看了N多资料都不可以。最后将一些header注释掉就可以了，真郁闷。

我马上试验，等有做出成熟的例子，再写新文章提供给大家！