C#模拟登录总结

/// <summary> 登录
/// </summary>
/// <param name="url"></param>
/// <param name="paramList"></param>
/// <returns></returns>
public static string Login(String url, String paramList)
{
HttpWebResponse res = null;
string strResult = "";
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("GBK");
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;
}
/// <summary> 获取页面HTML
/// </summary>
/// <param name="url"></param>
/// <param name="paramList"></param>
/// <returns></returns>
public static string getPage(String url, String paramList)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Headers["If-None-Match"] = "36d0ed736e88c71:d9f";
req.Referer = "http://website/login.do";
CookieContainer cookieCon = new CookieContainer();
req.CookieContainer = cookieCon;
req.CookieContainer.SetCookies(new Uri(url), cookieheader);
HttpWebResponse res = (HttpWebResponse)req.GetResponse();
StreamReader sr = new StreamReader(res.GetResponseStream(),Encoding.Default);
string strResult = sr.ReadToEnd();
sr.Close();
return strResult;
}调用:

string postData = "userName=admin&password=pass&area=2006&Submit=%B5%C7+%C2%BC";
string strLogin, strResult;
strLogin = Login("http://website/login.do", postData);

strResult = getPage("http://website/tohjtree.do", "");
//输出
this.webBrowser1.Document.Write(strResult);