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      3.   
          
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      HttpRequest取得網站信息的程序示例
                
                  發表時間：2024-02-18             來源：明輝站整理相關軟件相關文章人氣：          
              
      [摘要]問題：有的網站的相關內容必須要在登錄后才可以查看，其登錄信息保存在session變量之中。這樣，使用asphttp等組件就難以正確得到所要的信息。解決：使用asp.net中的httprequest和httpresponse來實現。要點：1。 通過附加一個cookiecontainer到httpre...
      問題：有的網站的相關內容必須要在登錄后才可以查看，其登錄信息保存在session變量之中。這樣，使用asphttp等組件就難以正確得到所要的信息。
      解決：使用asp.net中的httprequest和httpresponse來實現。
      要點：
      1。 通過附加一個cookiecontainer到httprequest對象中，可以得到登錄后返回的代表SESSION ID的COOKIE。 見Login方法
      2。 將此COOKIE包含在一個cookiecontainer中并附加到另一個HTTPREQUEST請求中，則可以實現SESSION的還原。見getPage方法
      源程序如下：
      getHttpInfo.aspx:
      <%@ Page language="c#" Codebehind="getHttpInfo.aspx.cs" AutoEventWireup="false" Inherits="PdfTest.getHttpInfo" %>
      <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
      <HTML>
      <HEAD>
      <title>WebForm1</title>
      <meta content="Microsoft Visual Studio 7.0" name="GENERATOR">
      <meta content="C#" name="CODE_LANGUAGE">
      <meta content="JavaScript" name="vs_defaultClientScript">
      <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
      </HEAD>
      <body>
      <form id="Form1" method="post" runat="server">
      </form>
      </body>
      </HTML>

      getHttpInfo.aspx.cs:
      using System;
      using System.Collections;
      using System.ComponentModel;
      using System.Data;
      //using System.Data.OleDb;
      using System.Drawing;
      using System.Web;
      using System.Web.SessionState;
      using System.Web.UI;
      using System.Web.UI.WebControls;
      using System.Web.UI.HtmlControls;
      using System.Net;
      using System.IO;
      using System.Text;
      using System.Text.RegularExpressions;
      using Microsoft.Data.Odbc;
      namespace PdfTest
      {
      /// <summary>
      /// Summary description for WebForm1.
      /// </summary>
      public class getHttpInfo : System.Web.UI.Page
      {
      protected static string cookieheader;

      private void Page_Load(object sender, System.EventArgs e)
      {
      // Put user code to initialize the page here
      string strResult;
      if (HttpContext.Current.Application["cookieheader"] != null)
      {
      cookieheader = (string)HttpContext.Current.Application["cookieheader"];
      }
      else
      {
      //Login into the website and keep the cookie for the session in the application variable
      string strLogin = Login("http://www.thesiteyouwanttovisit/theloginpage.asp", "Action=&USERID=&Password=") ;
      }

      strResult = getPage("http://www.thesiteyouwanttovisit/theloginpage.asp", "Action=&data=") ;

      //Write the result to htm file
      FileStream htmFile = new FileStream("c:\save.htm", FileMode.OpenOrCreate);
      StreamWriter sw = new StreamWriter(htmFile);
      sw.Write(strResult);
      sw.Close();
      htmFile.Close();
      // output the result
      Response.Write(strResult);
      }

      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));
      HttpContext.Current.Application.Lock();
      HttpContext.Current.Application["cookieheader"] = cookieheader;
      HttpContext.Current.Application.UnLock();
      Stream ReceiveStream = res.GetResponseStream();
      Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
      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;
      }

      public static string getPage(String url, String paramList) 
      {
      HttpWebResponse res = null;
      string strResult = "";
      try 
      {
      HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
      req.Method = "POST";
      req.KeepAlive = true;
      req.ContentType = "application/x-www-form-urlencoded";
      CookieContainer cookieCon = new CookieContainer();
      req.CookieContainer = cookieCon;
      req.CookieContainer.SetCookies(new Uri(url),cookieheader);
      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();
      Stream ReceiveStream = res.GetResponseStream();
      Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
      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;
      }

      #region Web Form Designer generated code
      override protected void OnInit(EventArgs e)
      {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
      }
      /// <summary>
      /// Required method for Designer support - do not modify
      /// the contents of this method with the code editor.
      /// </summary>
      private void InitializeComponent()
      { 
      this.Load += new System.EventHandler(this.Page_Load);
      }
      #endregion
       
      }
      } 



              
              
                 
              
                                            
                              		       
                          
                           		  
        
                            
      
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