自动登录网页，浏览页面代码,Asp.Net代码库,德仔网

代码语言

代码分类

【Asp.Net】自动登录网页，浏览页面

作者:特务小强 / 发布于2012/7/9/ 627

需求：客户的数据同时存在在另外一个不可控的系统中，需要和当前系统同步。思路：自动登录另外一个系统，然后抓取数据，同步到本系统中。技术点：模拟用户登录；保存登录状态；抓取数据注：对于有验证码登录系统的无效。（如果该系统的验证码放到cookie中存储的例外，这个容易破解）

<div></div>
<div>/// <summary>
 /// visit the target url
 /// </summary>
 /// <param name="targetURL"></param>
 /// <param name="cc">this is for keeping cookies and sessions</param>
 /// <param name="param">this is the data need post inside form</param>
 /// <returns>html page</returns>
 public static string PostAndGetHTML(string targetURL,CookieContainer cc,Hashtable param)
 {
 //prepare the submit data
 string formData = "";
 foreach (DictionaryEntry de in param)
 {
 formData += de.Key.ToString() + "=" + de.Value.ToString() + "&";
 }
 if (formData.Length > 0)
 formData = formData.Substring(0, formData.Length - 1); //remove last '&'

 ASCIIEncoding encoding = new ASCIIEncoding();
 byte[] data = encoding.GetBytes(formData);

 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(targetURL);
 request.Method = "POST"; //post
 request.ContentType = "application/x-www-form-urlencoded";
 request.ContentLength = data.Length;
 request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; .NET CLR 2.0.1124)";

 Stream newStream = request.GetRequestStream();
 newStream.Write(data, 0, data.Length);

 newStream.Close();

 request.CookieContainer = cc;
 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
 cc.Add(response.Cookies);
 Stream stream = response.GetResponseStream();
 string result = new StreamReader(stream, System.Text.Encoding.Default).ReadToEnd();
 return result;
 }

 public static DataTable ConvertToDT(DataTable dt, string tableHTML)
 {

 int lastTD = tableHTML.ToLower().LastIndexOf("</td>");
 int firstRow = tableHTML.ToLower().IndexOf("<tr") + 3;//after ""<tr
 int index = tableHTML.ToLower().IndexOf("<tr", firstRow) + 3;//after ""<tr
 while (index < lastTD)
 {
 DataRow dr = dt.NewRow();
 for (int i = 0; i < dt.Columns.Count; i++)
 {
 string value = "";
 int startTD = tableHTML.ToLower().IndexOf("<td", index) + 3;//after "<td"
 int endTD = tableHTML.ToLower().IndexOf("</td>", startTD);
 if (endTD < 0)
 break;
 string tdStr = tableHTML.Substring(startTD, endTD - startTD);

 //remove <> and others
 tdStr = tdStr.Replace("&nbsp;", "").Replace("\t", "").Replace("\r", "");
 string[] v = tdStr.Split('<', '>');
 for (int j = 0; j < v.Length; j++)
 {
 j++;
 if (v[j].Trim() != "")
 {
 value = v[j].Trim();
 break;
 }
 }
 //
 dr[i] = value;
 index = endTD;
 }
 dt.Rows.Add(dr);

 }
 return dt;
 }
<div></div>
<div><strong><font size="2"><span style="font-family: SimSun;">这一个是调用的例子：先登录，在查询。</span><font face="Verdana"> </font><span style="font-family: SimSun;">实际中这个逻辑可能有很多步骤</span></font></strong></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div><font size="2"><span style="font-family: SimSun;">CookieContainer cc = new CookieContainer();//this is for keep the Session and Cookie
 Hashtable param = new Hashtable();//this is for keep post data.

 string urlLogin = "<a href="http://demo.server//login.asp">http://demo.server//login.asp</a>";
 //do find the elementId that needed. check the source of login page can get this information
 param.Add("User", "xxx");
 param.Add("Password", "xxxx");
 string result =GrabHelper.PostAndGetHTML(urlLogin, cc, param);
 //check result, whether login success

 //if login success, goto the target url, and input some value.
 string url2 = " <a href="http://demo.server/query.asp?id=1";//">http://demo.server/query.asp?id=1";//</a> need change. special logic
 param.Clear();
 //param.Add("SearchAreaId","JobId")
 result = GrabHelper.PostAndGetHTML(url2, cc, new Hashtable());
 //ConvertToDT the html or do something others</span></font></div>
<div></div>

评论列表

本站所提供的代码，版权归原作者所有，若有侵犯作者版权，请与我们联系，我们将立即删除或修改。谢谢!
本站所有代码发布及提供者。

试试其它关键字

　自动登录网页　

同语言下

可能有用的

特务小强贡献的其它代码(7)