网上取数据的一个例子

最新推荐文章于 2024-04-24 13:27:31 发布

原创最新推荐文章于 2024-04-24 13:27:31 发布 · 1.4k 阅读

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CC 4.0 BY-SA版权

文章标签：

#string #null #stream #url #textbox #exception

博客展示了通过URL获取HTML内容的代码。包含Page_Load方法，设置URL、Cookie等，获取VIEWSTATE并构造参数进行POST请求。还定义了getHTMLByUrlCook方法，处理GET和POST请求，处理请求流和响应流，同时对异常情况进行了处理。

private void Page_Load(object sender, System.EventArgs e)
  {


   string url="http://localhost/webUserWindowExample/WebForm5.aspx";
   System.Net .CookieContainer cook=new System.Net .CookieContainer();
   string gets=getHTMLByUrlCook(url,ref cook,"Get",null,true);
   string strViewState = System.Text .RegularExpressions .Regex.Replace(gets,"[//s*//S*]*<input type=/"hidden/" name=/"__VIEWSTATE/" value=/"([^/"]*)/"[//s*//S*]*","$1",System.Text .RegularExpressions.RegexOptions.IgnoreCase);

   string param="__VIEWSTATE="+System.Web.HttpUtility.UrlEncode(strViewState)+"&TextBox1=xxxx&Button1=Button&CheckBox1=on";

   string s=a.getHTMLByUrlCook(url,ref cook,"POST",param,true);
   Response.Write(s);
  }

  public string getHTMLByUrlCook(string url,ref System.Net.CookieContainer cook,string sMethod,string Param,bool bAutoRedirect)
  {
   sMethod = sMethod.ToUpper();
   sMethod = sMethod!="POST"?"GET":sMethod;
   string res ="";
   HttpWebRequest re =(HttpWebRequest)HttpWebRequest.Create(url);
   re.CookieContainer = cook; // attach the cook object
   re.Method = sMethod;
   //   re.AllowAutoRedirect = bAutoRedirect;
   //   re.UserAgent="Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; MyIE2; .NET CLR 1.1.4322)";
   //

//re.ClientCertificates = new System.Security.Cryptography.X509Certificates.X509CertificateCollection();
//re.ClientCertificates = System.Security.Cryptography.X509Certificates.X509Certificate.CreateFromSignedFile();

   //re.Timeout = 2000;
   if (sMethod =="POST")   // Post data to Server
   {
    re.ContentType="application/x-www-form-urlencoded";
    Byte[] b = System.Text.Encoding.UTF8.GetBytes(Param);
    re.ContentLength = b.Length;
    try
    {
     Stream oSRe = re.GetRequestStream();
     oSRe.Write(b,0,b.Length);
     oSRe.Close();
     oSRe = null;
    }
    catch(Exception )
    {
     re = null;
     return "-1";
    }
   }

   HttpWebResponse rep = null;
   Stream oResponseStream = null;
   StreamReader oSReader = null;
   try
   {
    rep=(HttpWebResponse)re.GetResponse();
    oResponseStream = rep.GetResponseStream();
    oSReader = new StreamReader(oResponseStream,System.Text.Encoding.Default);
    res =oSReader.ReadToEnd();
   }
   catch (System.Net.WebException e)
   {
    //res ="-1";

    res = e.ToString();
   }

   if (rep!=null)
   {
    rep.Close();
    rep = null;
   }
   if(oResponseStream!= null)
   {
    oResponseStream.Close();
    oResponseStream = null;
   }

   if(oSReader!=null)
   {
    oSReader.Close();
    oSReader = null;
   }
   re = null;