我在C#中使用网页相对较新.我想要做的是登录一个特定的网站(https://www15.swalife.com/PortalWeb/portal/cwaLogon.jsp)并允许将页面重定向到默认页面,然后从那里导航到( https://www15.swalife.com/csswa/ea/plt/accessELITT.do)并下载源代码并将其输出到字符串.
我已经想出了如何通过HTTPWebRequest和HTTPWebResponse下载源代码,但是在编写日志记录函数方面遇到了麻烦.我想我将不得不用POST做点什么？我也查看了http://www.dreamincode.net/forums/topic/152297-c%23-log-in-to-website-programmatically/.
jimmyjambles提供的代码完美无瑕,除了它没有完全得到我想要的页面的源代码.该代码表明登录过程失败了,但我相信稍微调整一下我可以让它工作......也适用于所有遇到问题的人:
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(AcceptAllCertifications);
尝试将"public string"和"public bool"函数分别更改为"public static string"和"public static bool":)
响应HTML:
"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">\n<HTML>\n<HEAD>\n\n\n\n\n\n\n<META http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\">\n<META name=\"GENERATOR\" content=\"IBM WebSphere Studio\">\n<TITLE>endSession.jsp</TITLE>\n<LINK rel=\"stylesheet\" href=\"eipPortletStyles/swalife.css\" type=\"text/css\">\n\t<script type=\"text/javascript\" language=\"JavaScript\" \n\t\tsrc=\"eipCommonJavaScript/eipGeneralFunctions.js\"/> </script>\n\t\t\n<script type=\"text/javascript\">\n\n\tfunction refreshParent()\n\t{\n\t if(window.parent)\n\t {\n\t if(window.parent.name == 'appMainFrame')\n\t window.parent.location = \"/csswa/ea/plt/logout.do\";\n\t // alert('Your session has expired. Please login again. ');\n\t }\n\t}\n\n</script>\n</HEAD>\n<BODY onload=\"refreshParent();\">\n \n\t \t<div class=\"eipErrors\">\n \t\t\t<div class=\"legendLabel\">Message</div>\n \t\t\t\n \t\t\t <div class=\"errorsHeader formTitle\">You Have Exited Out of Crew Web Access.<br> \t\t\t \n \t\t\t </div>\n \t\t\t \n \t\t\t<div class=\"errorsHeader formTitle\"> Please Close this Window and <font size=\"+1\">Log Out of SWALife</font> to Complete the Log Out Process. </div>\n \t\t<div class=\"errorsText\">\n \t\t \n \t\t\t\t\n \t\t</div>\n \t\t\n \t\t\t\n \t\t\n \t\t<div class=\"errorsFooter\">You will need to log back in before continuing.</div> \t\n \t\t\n \t</div>\n \n</BODY>\n</HTML>\n"
为了在登录后使用HttpWebRequest访问辅助URL,您需要记住一些事情.
首先,正如Casperah所提到的,您需要检查登录表单并确定用于接收登录数据的控件的"名称"属性.
完成此操作后,您需要相应地格式化一个帖子字符串并将其提供给WebRequest.
最后一个考虑因素是,一旦您登录,您将需要存储和维护从您登录的服务器分配给您的cookie.
我从这篇msdn文章中获取了一个WebRequest片段,并对其进行了修改,以便在登录后执行第二页请求.
string loginurl = "http://www.gmail.com";
string secondurl = "http://mail.google.com/prefs";
string username = "bob@gmail.com";
string password = "12345";
GetSecondaryLoginPage(loginurl, secondurl, username, password);
public string GetSecondaryLoginPage(string loginurl, string secondurl, string username, string password, string cookieName = null)
{
// Create a request using a URL that can receive a post.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(loginurl);
// Set the Method property of the request to POST.
request.Method = "POST";
CookieContainer container = new CookieContainer();
if (cookieName != null)
container.Add(new Cookie(cookieName, username, "/", new Uri(loginurl).Host));
request.CookieContainer = container;
// Create POST data and convert it to a byte array. Modify this line accordingly
string postData = String.Format("username={0}&password={1}", username, password);
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(AcceptAllCertifications);
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded";
// Set the ContentLength property of the WebRequest.
request.ContentLength = byteArray.Length;
// Get the request stream.
Stream dataStream = request.GetRequestStream();
// Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length);
// Close the Stream object.
dataStream.Close();
// Get the response.
WebResponse response = request.GetResponse();
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
using (StreamWriter outfile =
new StreamWriter("output.html"))
{
outfile.Write(responseFromServer.ToString());
}
// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();
request = (HttpWebRequest)WebRequest.Create(secondurl);
request.CookieContainer = container;
response = request.GetResponse();
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
reader = new StreamReader(dataStream);
// Read the content.
responseFromServer = reader.ReadToEnd();
// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();
return responseFromServer;
}
public bool AcceptAllCertifications(object sender, System.Security.Cryptography.X509Certificates.X509Certificate certification, System.Security.Cryptography.X509Certificates.X509Chain chain, System.Net.Security.SslPolicyErrors sslPolicyErrors)
{
return true;
}
唯一添加的行是postData和cookies.
您需要修改该行
string postData = String.Format("username={0}&password={1}", username, password);
基于您在表单上的控件,因为您发布了您尝试使用的网站,我可以猜测您可能正在寻找
string postData = String.Format("uid={0}&portalBase=cwa&password={1}", username, password);
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