这个网站的自动登陆如何实现？

Question

http://onepoint.infor.com之前某个朋友写的自动登陆代码如下，但是不知道如何登陆这个网站。
        //登陆时调用
        //login("http://thewebsite/", "username=yourname&password=yourpwd") ;
        private string login(String url, String paramList)
        {
            HttpWebResponse res = null;
            string strResult = "";
            string cookieheader = "";
            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));
                Stream ReceiveStream = res.GetResponseStream();
                Encoding encode = System.Text.Encoding.GetEncoding("gb2312");
                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;
        }        //获取数据时调用
        private void getPage(String url, String paramList)
        {
            HttpWebResponse res = null;
            string cookieheader = "";
            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();
                byte[] buffer = new byte[1024];
                string filename = "c:\\temp\\temp.data";
                Stream outStream = File.Create(filename);
                int l;
                do
                {
                    l = ReceiveStream.Read(buffer, 0,
                    buffer.Length);
                    if (l > 0)
                        outStream.Write(buffer, 0, l);
                } while (l > 0);                outStream.Close();            }
            catch (Exception)
            {
            }
            finally
            {
                if (res != null)
                {
                    res.Close();
                }
            }
            return;
        }

Answer 1

需要弄个嗅包器比如iehttpheaders v1.6，看看提交表单的时候，post的数据。用Httpwebrequest和httpwebresponse，记录下登陆响应后的cookiecontainer，然后再请求你想要的页面

Answer 2

其实就是向登陆页post信息,成功后,获得信息的过程啊.
就类似网页抓取.只不过要先登陆.

Answer 3

to ruan_hg(阿阮):
用不着什么iehttpheaders了吧，我觉得楼主只要把第一个子程序改一改就行了，就是那个private string login(String url, String paramList){}中返回值最终改成cookieheader，也就是cookieheader = req.CookieContainer.GetCookieHeader(new Uri(url))那一行的结果，而不是Stream ReceiveStream = res.GetResponseStream()的字符串结果strResult += str，然后，把第一个子程序的返回值作为参数传给第二个子程序private void getPage(String url, String paramList){}（参数应该再加一个，用来接受cookieheader的值），因为我看了一下，在第二个子程序里，楼主虽然定义了一个名为string cookieheader = ""的变量，但一直没有对他传值，所以cookieheader的值一直都是空，所以也就得不到验证，无法访问请求的页面内容。

Answer 4

现在不是cookier的问题，我不知道post过去什么数据。
我用httpwatch观测到post的东西是：
  <parameter name="__VIEWSTATE">dDwxMzk4Njg0NTM5O3Q8O2w8aTwzPjs+O2w8dDw7bDxpPDE+O2k8Mz47aTw3Pjs+O2w8dDxwPHA8bDxUZXh0Oz47bDxJbmZvciBPbmVQb2ludCBPbmxpbmU7Pj47Pjs7Pjt0PHA8cDxsPFRleHQ7PjtsPFBsZWFzZSBlbnRlciB5b3VyIGVtYWlsIGFkZHJlc3MgYW5kIHBhc3N3b3JkIGJlbG93Ljs+Pjs+Ozs+O3Q8dDxwPHA8bDxWaXNpYmxlOz47bDxvPGY+Oz4+Oz47Oz47Oz47Pj47Pj47PmH66Tpp6vVvy2W0zDVGa+ckfXPG</parameter> 
  <parameter name="txtEmail">[email protected]</parameter> 
  <parameter name="txtPassword">XXXXXX</parameter> 
  <parameter name="cmdLogin">Verify My Account Information</parameter> 那么在程序中，是否需要把__VIEWSTATE的内容Post过去？