网站登录

代码 

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
using System.Threading;

namespace WebSiteAccess
{
    public class HttpHelper
    {
        private static string contentType = "application/x-www-form-urlencoded";
        private static string accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/x-silverlight, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-silverlight-2-b1, */*";
        private static string 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)";
        private static int currentTry = 0;

        #region 属性

        private static CookieContainer cookie = new CookieContainer();
        /// <summary>
        /// Cookie容器
        /// </summary>
        public static CookieContainer CookieContainer
        {
            get
            {
                return cookie;
            }
        }

        private static Encoding encoding = Encoding.GetEncoding("utf-8");
        /// <summary>
        /// 获取网页源码时使用的编码
        /// </summary>
        public static Encoding Encoding
        {
            get
            {
                return encoding;
            }
            set
            {
                encoding = value;
            }
        }

        private static int delay = 3000;//延迟访问防止连续访问被发现
        public static int NetworkDelay
        {
            get
            {
                Random r = new Random();
                return (r.Next(delay / 1000, delay / 1000 * 2)) * 1000;
            }
            set
            {
                delay = value;
            }
        }

        private static int maxTry = 300;
        public static int MaxTry
        {
            get
            {
                return maxTry;
            }
            set
            {
                maxTry = value;
            }
        }
        #endregion


        /// <summary>
        /// 获取指定页面的HTML代码
        /// </summary>
        /// <param name="url">指定页面的路径</param>
        /// <param name="postData">回发的数据</param>
        /// <param name="isPost">是否以post方式发送请求</param>
        /// <param name="cookieContainer">Cookie集合</param>
        /// <returns></returns>
        public static string GetHtml(string url, string postData, bool isPost, CookieContainer cookieContainer)
        {
            if (string.IsNullOrEmpty(postData))
            {
                return GetHtml(url, cookieContainer);
            }

            Thread.Sleep(NetworkDelay);//延迟访问

            currentTry++;

            HttpWebRequest httpWebRequest = null;
            HttpWebResponse httpWebResponse = null;
            try
            {
                byte[] byteRequest = Encoding.Default.GetBytes(postData);

                httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
                httpWebRequest.CookieContainer = cookieContainer;
                httpWebRequest.ContentType = contentType;
                httpWebRequest.ServicePoint.ConnectionLimit = maxTry;
                httpWebRequest.Referer = url;
                httpWebRequest.Accept = accept;
                httpWebRequest.UserAgent = userAgent;
                httpWebRequest.Method = isPost ? "POST" : "GET";
                httpWebRequest.ContentLength = byteRequest.Length;

                Stream stream = httpWebRequest.GetRequestStream();
                stream.Write(byteRequest, 0, byteRequest.Length);
                stream.Close();

                httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                Stream responseStream = httpWebResponse.GetResponseStream();
                StreamReader streamReader = new StreamReader(responseStream, encoding);
                string html = streamReader.ReadToEnd();
                streamReader.Close();
                responseStream.Close();
                currentTry = 0;

                httpWebRequest.Abort();
                httpWebResponse.Close();

                return html;
            }
            catch (Exception e)
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine(DateTime.Now.ToString("HH:mm:ss ") + e.Message);
                Console.ForegroundColor = ConsoleColor.White;

                if (currentTry <= maxTry)
                {
                    GetHtml(url, postData, isPost, cookieContainer);
                }
                currentTry--;

                if (httpWebRequest != null)
                {
                    httpWebRequest.Abort();
                } if (httpWebResponse != null)
                {
                    httpWebResponse.Close();
                }
                return string.Empty;
            }
        }

        /// <summary>
        /// 获取指定页面的HTML代码
        /// </summary>
        /// <param name="url">指定页面的路径</param>
        /// <param name="cookieContainer">Cookie集合</param>
        /// <returns></returns>
        public static string GetHtml(string url, CookieContainer cookieContainer)
        {
            Thread.Sleep(NetworkDelay);

            currentTry++;
            HttpWebRequest httpWebRequest = null;
            HttpWebResponse httpWebResponse = null;
            try
            {

                httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
                httpWebRequest.CookieContainer = cookieContainer;
                httpWebRequest.ContentType = contentType;
                httpWebRequest.ServicePoint.ConnectionLimit = maxTry;
                httpWebRequest.Referer = url;
                httpWebRequest.Accept = accept;
                httpWebRequest.UserAgent = userAgent;
                httpWebRequest.Method = "GET";

                httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                Stream responseStream = httpWebResponse.GetResponseStream();
                StreamReader streamReader = new StreamReader(responseStream, encoding);
                string html = streamReader.ReadToEnd();
                streamReader.Close();
                responseStream.Close();

                currentTry--;

                httpWebRequest.Abort();
                httpWebResponse.Close();

                return html;
            }
            catch (Exception e)
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine(DateTime.Now.ToString("HH:mm:ss ") + e.Message);
                Console.ForegroundColor = ConsoleColor.White;

                if (currentTry <= maxTry)
                {
                    GetHtml(url, cookieContainer);
                }

                currentTry--;

                if (httpWebRequest != null)
                {
                    httpWebRequest.Abort();
                } if (httpWebResponse != null)
                {
                    httpWebResponse.Close();
                }
                return string.Empty;
            }
        }

        /// <summary>
        /// 获取指定页面的HTML代码
        /// </summary>
        /// <param name="url">指定页面的路径</param>
        /// <returns></returns>
        public static string GetHtml(string url)
        {
            return GetHtml(url, cookie);
        }

        /// <summary>
        /// 获取指定页面的HTML代码
        /// </summary>
        /// <param name="url">指定页面的路径</param>
        /// <param name="postData">回发的数据</param>
        /// <param name="isPost">是否以post方式发送请求</param>
        /// <returns></returns>
        public static string GetHtml(string url, string postData, bool isPost)
        {
            return GetHtml(url, postData, isPost, cookie);
        }

        /// <summary>
        /// 获取指定页面的Stream
        /// </summary>
        /// <param name="url">指定页面的路径</param>
        /// <param name="cookieContainer">Cookie集合</param>
        /// <returns>responseStream</returns>
        public static Stream GetStream(string url, CookieContainer cookieContainer)
        {
            //Thread.Sleep(delay);

            currentTry++;
            HttpWebRequest httpWebRequest = null;
            HttpWebResponse httpWebResponse = null;

            try
            {

                httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
                httpWebRequest.CookieContainer = cookieContainer;
                httpWebRequest.ContentType = contentType;
                httpWebRequest.ServicePoint.ConnectionLimit = maxTry;
                httpWebRequest.Referer = url;
                httpWebRequest.Accept = accept;
                httpWebRequest.UserAgent = userAgent;
                httpWebRequest.Method = "GET";

                httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                Stream responseStream = httpWebResponse.GetResponseStream();
                currentTry--;

                //httpWebRequest.Abort();
                //httpWebResponse.Close();

                return responseStream;
            }
            catch (Exception e)
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine(DateTime.Now.ToString("HH:mm:ss ") + e.Message);
                Console.ForegroundColor = ConsoleColor.White;

                if (currentTry <= maxTry)
                {
                    GetHtml(url, cookieContainer);
                }

                currentTry--;

                if (httpWebRequest != null)
                {
                    httpWebRequest.Abort();
                } if (httpWebResponse != null)
                {
                    httpWebResponse.Close();
                }
                return null;
            }
        }

        /// <summary>
        /// 获取指定页面的Stream
        /// </summary>
        /// <param name="url">指定页面的路径</param>
        /// <returns></returns>
        public static Stream GetStream(string url)
        {
            return GetStream(url, cookie);
        }

        /// <summary>
        /// 在客户端提交数据，不太安全
        /// </summary>
        /// <param name="url">http://172.21.140.125:9704/analytics/saw.dll?Dashboard&_scid=VudJojSNiYU</param>
        /// <param name="postData">NQUser=DMS-QA&NQPassword=DMS-QA&saveLangPref=true&icharset=gb2312</param>
        public static void PostByClient(string url, string postData)
        {
            string htmlData = "";
            htmlData = string.Format("<form id=\"logonForm\" method=\"post\" action=\"{0}\">", url);

            string[] data = postData.Split('&');
            foreach (string item in data)
            {
                string[] key = item.Split('=');
                if (key.Length == 2)
                {
                    htmlData += string.Format("<input type=\"hidden\" name=\"{0}\" value=\"{1}\" />", key[0], key[1]);
                }
            }

            htmlData += "<script type=\"text/javascript\">";
            htmlData += "function PostData(){ var theForm = document.forms['logonForm'];theForm.submit();} PostData();";
            htmlData += "</script></form>";
            System.Web.HttpContext.Current.Response.Write(htmlData);

            //<form id="logonForm" method="post" action="http://172.21.140.125:9704/analytics/saw.dll?Dashboard&_scid=VudJojSNiYU">
            //    <input type="hidden" name="NQUser" value="DMS-QA" />
            //    <input type="hidden" name="NQPassword" value="DMS-QA" />
            //    <input type="hidden" name="saveLangPref" value="true" />
            //    <input type="hidden" name="icharset" value="gb2312" />
            //    <script type="text/javascript">
            //        function PostData(){ var theForm = document.forms['logonForm'];theForm.submit();} 
            //        PostData();
            //    </script>
            //</form>
        }


    }
}
代码 
<%@ Page Language="C#" AutoEventWireup="true" Codebehind="Default.aspx.cs" Inherits="WebSiteAccess._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <asp:Button ID="Button1" runat="server" Text="Login" OnClick="Button1_Click" />
        <asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_Click" />
        <div>
            数据：
            <div id="div1" runat="server">
            </div>
        </div>
    </form>
</body>
</html>
代码 
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net;

namespace WebSiteAccess
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }


        void LoginByServer()
        {
            string url = "http://172.21.140.125:9704/analytics/saw.dll?Dashboard&_scid=VudJojSNiYU";
            string postData = "NQUser = DMS - QA & NQPassword = DMS - QA & saveLangPref = true & icharset = gb2312";
            div1.InnerHtml = HttpHelper.GetHtml(url, postData, true);
        }
        void LoginByClient()
        {
            string url = "http://172.21.140.125:9704/analytics/saw.dll?Dashboard&_scid=VudJojSNiYU";
            string postData = "NQUser = DMS - QA & NQPassword = DMS - QA & saveLangPref = true & icharset = gb2312";
            div1.InnerHtml = HttpHelper.PostByClient(url, postData);
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            LoginByServer();
        }
        protected void Button2_Click(object sender, EventArgs e)
        {
            LoginByServer();
        }
    }
}
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原文地址：https://www.cnblogs.com/yym/p/1675811.html