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利用WebRequest来实现模拟浏览器通过Post方式向服务器提交数据

 2006-04-04 17:05:10 来源:WEB开发网   
核心提示://通过Post发送的数据 string payload="chkbook=book&keyWord=管理"; WebRequest req = WebRequest.Create("http://localhost/pceo/Search.aspx"); req.Method

//通过Post发送的数据
  string payload="chkbook=book&keyWord=管理";
  WebRequest req = WebRequest.Create("http://localhost/pceo/Search.aspx");
  req.Method = "POST";
  req.ContentType = "application/x-www-form-urlencoded";
  StringBuilder UrlEncoded = new StringBuilder();
  Char[] reserved = {'?', '=', '&'};
  byte[] SomeBytes = null;
  if (payload != null)
  {
   int i=0, j;
   while(i<payload.Length)
   {
   j=payload.IndexOfAny(reserved, i);
   if (j==-1)
   {
    UrlEncoded.Append(HttpUtility.UrlEncode(payload.Substring(i, payload.Length-i),System.Text .Encoding .GetEncoding ("gb2312")));
    break;
   }
   UrlEncoded.Append(HttpUtility.UrlEncode(payload.Substring(i, j-i),System.Text .Encoding .GetEncoding ("gb2312")));
   UrlEncoded.Append(payload.Substring(j,1));
   i = j+1;
   }
   SomeBytes = Encoding.Default.GetBytes(UrlEncoded.ToString());
   req.ContentLength = SomeBytes.Length;
   Stream newStream = req.GetRequestStream();
   newStream.Write(SomeBytes, 0, SomeBytes.Length);
   newStream.Close();
  }
  else
  {
   req.ContentLength = 0;
  }
  try
  {
   WebResponse result = req.GetResponse();
   Stream ReceiveStream = result.GetResponseStream();

   Byte[] read = new Byte[512];
   int bytes = ReceiveStream.Read(read, 0, 512);

   txtHTML.InnerHtml = "";
   while (bytes > 0)
   {

// 注意:
   // 下面假定响应使用 UTF-8 作为编码方式。
   // 如果内容以 ANSI 代码页形式(例如,932)发送,则使用类似下面的语句:
   //  Encoding encode = System.Text.Encoding.GetEncoding("shift-jis");
   Encoding encode = System.Text.Encoding.GetEncoding("gb2312");
   txtHTML.InnerHtml = txtHTML.InnerHtml + encode.GetString(read, 0, bytes);
   bytes = ReceiveStream.Read(read, 0, 512);
   }
  }
  catch(Exception)
  {
   txtHTML.InnerHtml = "检索页时出错";
  }

出处:狂风之家 BLOG

Tags:利用 WebRequest 实现

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