模拟登录

Question

在网上找了些代码，但模拟登录总失败，不知道是什么原因，我想实现的效果是写一个用户控件，里面进行模拟登录A站点，但页面不跳转，还是在我当前的系统里，如果我要进入A站点，直接通过地址访问A就行了，不需要再登录了，请问这样如何实现？

Answer 1

本帖最后由 net_lover 于 2010-10-22 10:39:14 编辑

  

Answer 2

刚才用这个写了，但是不知道错的原因在哪里，一直就没登录成功/**//// <summary>  登录
        /// </summary>
        /// <param name="url"></param>
        /// <param name="paramList"></param>
        /// <returns></returns>
        public static string Login(String url, String paramList)
        {
            HttpWebResponse res = null;
            string strResult = "";
            try
            {
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
                req.Method = "POST";
                req.ContentType = "application/x-www-form-urlencoded";
                req.AllowAutoRedirect = false;
                CookieContainer cookieCon = new CookieContainer();
                req.CookieContainer = cookieCon;
                StringBuilder UrlEncoded = new StringBuilder();
                Char[] reserved = { '?', '=', '&' };
                byte[] SomeBytes = null;
                if (paramList != null)
                {
                    int i = 0, j;
                    while (i < paramList.Length)
                    {
                        j = paramList.IndexOfAny(reserved, i);
                        if (j == -1)
                        {
                            UrlEncoded.Append(HttpUtility.UrlEncode(paramList.Substring(i, paramList.Length - i)));
                            break;
                        }
                        UrlEncoded.Append(HttpUtility.UrlEncode(paramList.Substring(i, j - i)));
                        UrlEncoded.Append(paramList.Substring(j, 1));
                        i = j + 1;
                    }
                    SomeBytes = Encoding.UTF8.GetBytes(UrlEncoded.ToString());
                    req.ContentLength = SomeBytes.Length;
                    Stream newStream = req.GetRequestStream();
                    newStream.Write(SomeBytes, 0, SomeBytes.Length);
                    newStream.Close();
                }
                else
                {
                    req.ContentLength = 0;
                }                res = (HttpWebResponse)req.GetResponse();
                cookieheader = req.CookieContainer.GetCookieHeader(new Uri(url));
                Stream ReceiveStream = res.GetResponseStream();
                Encoding encode = System.Text.Encoding.GetEncoding("GBK");
                StreamReader sr = new StreamReader(ReceiveStream, encode);
                Char[] read = new Char[256];
                int count = sr.Read(read, 0, 256);
                while (count > 0)
                {
                    String str = new String(read, 0, count);
                    strResult += str;
                    count = sr.Read(read, 0, 256);
                }
            }
            catch (Exception e)
            {
                strResult = e.ToString();
            }
            finally
            {
                if (res != null)
                {
                    res.Close();
                }
            }
            return strResult;
        }
        /**//// <summary>  获取页面HTML
        /// </summary>
        /// <param name="url"></param>
        /// <param name="paramList"></param>
        /// <returns></returns>
        public static string getPage(String url, String paramList)
        {
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Headers["If-None-Match"] = "36d0ed736e88c71:d9f";
            req.Referer = "http://website/login.do";
            CookieContainer cookieCon = new CookieContainer();
            req.CookieContainer = cookieCon;
            req.CookieContainer.SetCookies(new Uri(url), cookieheader);
            HttpWebResponse res = (HttpWebResponse)req.GetResponse();
            StreamReader sr = new StreamReader(res.GetResponseStream(),Encoding.Default);
            string strResult = sr.ReadToEnd();
            sr.Close();
            return strResult;
        }

Answer 3

刚找了篇文章说是没把cookie带到本地浏览器，我试试。希望大家继续解答

Answer 4

//模拟登录baidu
using Zhuyi.Utility;WebUtil web = new WebUtil("https://passport.baidu.com/?login");
string data = "username=sq_zhuyi&password=******";
string str = web.Post(data, true);//登录成功
using System;
using System.Text;
using System.Net;
using System.IO;
using System.Drawing;namespace Zhuyi.Utility
{
    /// <summary>
    /// 对web请求的封装
    /// </summary>
    public class WebUtil
    {
        #region private members
        HttpWebRequest request;
        HttpWebResponse response;        Uri uri;
        Encoding encoding = Encoding.GetEncoding("gb2312");
        CookieContainer cc = new CookieContainer();
        string referer;
        byte[] data;        Stream stream;        bool hasError = false;        bool did = false;
        #endregion        public WebUtil()
        {
            uri = null;
        }
        public WebUtil(string url)
        {
            uri = new Uri(url);
        }        #region 属性
        /// <summary>
        /// 设置要请求的URL
        /// </summary>
        public string URL
        {
            set { uri = new Uri(value); }
        }
        /// <summary>
        /// 指定编码方式(默认:GB2312)
        /// </summary>
        public Encoding Encode
        {
            set { encoding = value; }
        }
        /// <summary>
        /// 设置/获取CookieContainer
        /// </summary>
        public CookieContainer Cookies
        {
            get { return cc; }
            set { cc = value; }
        }
        /// <summary>
        /// 设置请求链接源
        /// </summary>
        public string Referer
        {
            set { referer = value; }
        }
        /// <summary>
        /// 获取请求返回的cookies
        /// </summary>
        public CookieCollection GetCookies
        {
            get { return did ? cc.GetCookies(uri) : null; }
        }
        /// <summary>
        /// 获取请求返回的HTTP标头
        /// </summary>
        public WebHeaderCollection Headers
        {
            get { return did ? response.Headers : null; }
        }
        /// <summary>
        /// 是否发生错误
        /// </summary>
        public bool HasError
        {
            get { return hasError; }
        }
        #endregion        #region 提供方法
        /// <summary>
        /// GET方式发送请求
        /// </summary>
        /// <returns></returns>
        public string Get()
        {
            string msg = Send();            if (hasError) return msg;            StreamReader reader = null;
            try
            {
                reader = new StreamReader(stream, encoding);
                msg = reader.ReadToEnd();
            }
            catch (Exception ex)
            {
                hasError = true;
                msg = ex.Message;
            }
            finally
            {
                reader.Close();
                stream.Close();
                response.Close();
            }
            return msg;
        }
        /// <summary>
        /// 获取图片(GET)
        /// </summary>
        /// <returns></returns>
        public Image GetImage()
        {
            string msg = Send();            if (hasError) return null;            Bitmap bitMap = null;
            try
            {
                Image original = Image.FromStream(stream);
                bitMap = new Bitmap(original);
            }
            catch (Exception ex)
            {
                hasError = true;
                msg = ex.Message;
            }
            finally
            {
                stream.Close();
                stream.Close();
                response.Close();
            }
            return bitMap;
        }
        /// <summary>
        /// POST方式发送请求
        /// </summary>
        /// <param name="data">待发送数据</param>
        /// <param name="encoded">是否已进行编码</param>
        /// <returns></returns>
        public string Post(string data, bool encoded)
        {
            if (encoded) this.data = encoding.GetBytes(data);
            else this.data = encoding.GetBytes(EncodeData(data));            string msg = Send("POST");            if (hasError) return msg;            StreamReader reader = null;
            try
            {
                reader = new StreamReader(stream, encoding);
                msg = reader.ReadToEnd();
            }
            catch (Exception ex)
            {
                hasError = true;
                msg = ex.Message;
            }
            finally
            {
                reader.Close();
                stream.Close();
                response.Close();
            }
            return msg;
        }
        #endregion        #region 私有方法
        private string Send()
        {
            return Send("GET");
        }
        /// <summary>
        /// 发送请求
        /// </summary>
        /// <param name="method">请求方式(GET/POST)</param>
        private string Send(string method)
        {
            if (uri == null)
            {
                hasError = true;
                return "URI is null";
            }
            try
            {
                if (uri.ToString().ToLower().StartsWith("https"))
                {
                    ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
                }
                System.Net.ServicePointManager.Expect100Continue = false;                request = (HttpWebRequest)WebRequest.Create(uri);                if (referer != null)
                {
                    request.Referer = referer;
                }
                request.CookieContainer = cc;
                request.KeepAlive = true;
                request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)";                if (method.ToUpper() == "POST")
                {
                    request.Method = "POST";
                    request.ContentType = "application/x-www-form-urlencoded";
                    request.ContentLength = data.Length;                    Stream newStream = request.GetRequestStream();
                    newStream.Write(data, 0, data.Length);
                    newStream.Close();
                }                response = (HttpWebResponse)request.GetResponse();
                if (!string.IsNullOrEmpty(response.CharacterSet))
                {
                    try { encoding = Encoding.GetEncoding(response.CharacterSet); }
                    catch { }
                }
                stream = response.GetResponseStream();                hasError = false;
                return "true";
            }
            catch (Exception ex)
            {
                if (stream != null) stream.Close();
                if (response != null) response.Close();
                hasError = true;
                return ex.Message;
            }
            finally
            {
                did = true;
            }
        }        private string EncodeData(string data)
        {
            StringBuilder sb = new StringBuilder();
            Char[] reserved = { '=', '&' };            int i = 0, j;
            while (i < data.Length)
            {
                j = data.IndexOfAny(reserved, i);
                if (j == -1)
                {
                    sb.Append(System.Web.HttpUtility.UrlEncode(data.Substring(i, data.Length - i), encoding));
                    break;
                }
                sb.Append(System.Web.HttpUtility.UrlEncode(data.Substring(i, j - i), encoding));
                sb.Append(data.Substring(j, 1));
                i = j + 1;
            }
            return sb.ToString();
        }
        //https
        private bool CheckValidationResult(object sender,
            System.Security.Cryptography.X509Certificates.X509Certificate certificate,
            System.Security.Cryptography.X509Certificates.X509Chain chain,
            System.Net.Security.SslPolicyErrors errors)
        { // Always accept
            return true;
        }
        #endregion
    }
}更多使用工具：
http://download.csdn.net/source/2277988

Answer 5

登录成功后返回的字符串就是登录页面的HTML代码吧，但为什么我再通过地质访问该站点还是需要登录？

Answer 6

楼主是使用代码模拟后再打开浏览器吗？搞！！！
模拟登录就相当于打开了一个没有窗口的浏览器，浏览器间cookie是不共享的！
所以查看是否登录还是要用代码抓取网页判断