c# 使用 HttpWebRequest模擬登陸（附帶驗證碼）

在C#中，可以使用HttpWebRequest進行相關的模擬登陸，登陸後進行相關的操作，比如抓取數據，頁面分析，製作相關登陸助手等等。

先說下流程

1.使用httpwebrequest先進入你要登錄的網站，獲取cookie

2.使用第一步獲取的cookie到驗證碼的網頁將驗證碼下載下來。

3.使用Post數據發送至網站。如果有cookie則繼續保存。

4.使用第三步的cookie登陸相關網頁操作。

獲取相關數據可以使用抓包工具進行抓取，如httpwatch。（網上下載的好多都有病毒，下載的時候注意點）

1。

[c-sharp] view plain copy print ?

/// <summary>
/// 通過get方式請求頁面，傳遞一個實例化的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
{
//獲取服務器返回的資源
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());//圖片名
}
}
}
catch (WebException ex)
{
list.Clear();
list.Add("發生異常/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("發生異常：" + ex.Message);
}
return list;
}

/// <summary>
        /// 通過get方式請求頁面，傳遞一個實例化的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
            {
                //獲取服務器返回的資源
                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());//圖片名
                    }
                }
            }
            catch (WebException ex)
            {
                list.Clear();
                list.Add("發生異常/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("發生異常：" + ex.Message);
            }
            return list;
        }

2.下載驗證碼，保存在本地。

[c-sharp] view plain copy print ?

/// <summary>
/// 下載驗證碼圖片並保存到本地
/// </summary>
/// <param name="Url">驗證碼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);
//屬性配置
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
{
//獲取服務器返回的資源
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>
        /// 下載驗證碼圖片並保存到本地
        /// </summary>
        /// <param name="Url">驗證碼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);
            //屬性配置
            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
            {
                //獲取服務器返回的資源
                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。發送post數據

[c-sharp] view plain copy print ?

/// <summary>
/// 發送相關數據至頁面
/// 進行登錄操作
/// 並保存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
{
//獲取服務器返回的資源
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("發生異常/n/r"+ex.Message);
}
return list;
}

/// <summary>
        /// 發送相關數據至頁面
        /// 進行登錄操作
        /// 並保存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
            {
                //獲取服務器返回的資源
                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("發生異常/n/r"+ex.Message);
            }
            return list;
        }

4。就是第三步請求的鏈接地址換一個就行了

好了

以上核心代碼已經貼出了

具體實現需要靠你們按照你們自己的邏輯

還有一些header能不寫就不寫，因爲我2天前一直在獲取返回response這地方報500錯誤。

找了N多代碼，看了N多資料都不可以。最後將一些header註釋掉就可以了，真鬱悶。

http://blog.csdn.net/vip__888/article/details/5646260

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