代碼要點:
1、通過附加一個cookiecontainer到httprequest對象中,可以得到登錄後返回的代表SESSION ID的COOKIE。
2、將此COOKIE包含在一個cookiecontainer中並附加到另一個HTTPREQUEST請求中,則可以實現SESSION的還原。
部分主要代碼:
CookieContainer cookieContainer = new CookieContainer();
///////////////////////////////////////////////////
// 1. 打開 Login.aspx 頁面,獲得 VeiwState & EventValidation。
//如果是登陸頁爲asp.net頁面,需要獲取VeiwState及EventValidation
///////////////////////////////////////////////////
// 設置打開頁面的參數
string URI = http://localhost/Test/Login.aspx;
HttpWebRequest request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "GET";
request.KeepAlive = false;
// 接收返回的頁面
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
System.IO.Stream responseStream = response.GetResponseStream();
System.IO.StreamReader reader = new System.IO.StreamReader(responseStream,Encoding.UTF8);
string srcString = reader.ReadToEnd();
// 獲取頁面的 VeiwState
string viewStateFlag = "id=/"__VIEWSTATE/" value=/"";
int i = srcString.IndexOf(viewStateFlag) + viewStateFlag.Length;
int j = srcString.IndexOf("/"",
i);
string viewState = srcString.Substring(i, j - i);
// 獲取頁面的 EventValidation
string eventValidationFlag = "id=/"__EVENTVALIDATION/" value=/"";
i = srcString.IndexOf(eventValidationFlag) + eventValidationFlag.Length;
j = srcString.IndexOf("/"",
i);
string eventValidation = srcString.Substring(i, j - i);
///////////////////////////////////////////////////
// 2. 自動填充並提交 Login.aspx 頁面
///////////////////////////////////////////////////
// 提交按鈕的文本
string submitButton = "登錄";
// 用戶名和密碼
string userName = "1";
string password = "1";
// 將文本轉換成 URL 編碼字符串
viewState = System.Web.HttpUtility.UrlEncode(viewState);
eventValidation = System.Web.HttpUtility.UrlEncode(eventValidation);
submitButton = System.Web.HttpUtility.UrlEncode(submitButton);
// 要提交的字符串數據。格式形如:user=uesr1&password=123
string formatString =
"userName={0}&password={1}&loginButton={2}&__VIEWSTATE={3}&__EVENTVALIDATION={4}";
string postString =
string.Format(formatString, userName, password, submitButton, viewState, eventValidation);
// 將提交的字符串數據轉換成字節數組
byte[] postData = Encoding.ASCII.GetBytes(postString);
// 設置提交的相關參數
request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "POST";
request.KeepAlive = false;
request.ContentType = "application/x-www-form-urlencoded";
request.CookieContainer = cookieContainer;
request.ContentLength = postData.Length;
// 提交請求數據
System.IO.Stream outputStream = request.GetRequestStream();
outputStream.Write(postData, 0, postData.Length);
outputStream.Close();
// 接收返回的頁面
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream,Encoding.GetEncoding("GB2312"));
srcString = reader.ReadToEnd();
///////////////////////////////////////////////////
// 3. 打開 Default.aspx 頁面
///////////////////////////////////////////////////
// 設置打開頁面的參數
URI = "http://localhost:1165/WebTest/Default.aspx";
request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "GET";
request.KeepAlive = false;
request.CookieContainer = cookieContainer;
// 接收返回的頁面
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream, Encoding.UTF8);
srcString = reader.ReadToEnd();
///////////////////////////////////////////////////
// 4. 分析返回的頁面
///////////////////////////////////////////////////
//