[ 转]c# 使用 HttpWebRequest模拟登陆(附带验证码)
2013-04-09 21:24
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本文转自:/article/2865575.html
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。
[c-sharp] view plaincopyprint?
/// <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;
}
3。发送post数据
[c-sharp] view plaincopyprint?
/// <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;
}
/// <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
还有一些header能不写就不写,因为我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。
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。
[c-sharp] view plaincopyprint?
/// <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;
}
[c-sharp] view plaincopyprint? /// <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; } /// <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
[c-sharp] view plaincopyprint?
/// <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;
}
/// <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
还有一些header能不写就不写,因为我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。
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