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

使用C# HttpWebRequest模拟登录及处理验证码

最新推荐文章于 2019-06-22 14:23:54 发布

最新推荐文章于 2019-06-22 14:23:54 发布 · 784 阅读

文章标签：

#c#

本文介绍如何使用C#中的HttpWebRequest进行模拟登录，并处理登录过程中的验证码。包括获取cookie、下载验证码、发送post数据等关键步骤。

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。

view plain copy to clipboard print ?

///<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。

view plain copy to clipboard print ?

///<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

view plain copy to clipboard print ?

///<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。

view plain copy to clipboard print ?

///<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;
}

2.下载验证码，保存在本地。

view plain copy to clipboard print ?

///<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;
}

3。发送post数据

view plain copy to clipboard print ?

///<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;
}