以下是實現的：
首先的點擊火車訂票連結，就會開啟http://學生資訊平台網站/LoginToTrainSite.asa頁面。
LoginToTrainSite.asa頁面的大致代碼如下：
複製代碼 代碼如下:<%//根據使用者session擷取使用者名稱和密碼
%>
<html>
<body>
<div style='display:none'>
<form name="myForm" method="post" action="http://火車訂票網站/LoginFromOtherSite.aspx">
<input type="hidden" name="UserName" value="<%=userName%>" />
<input type="hidden" name="UserPwd" value="<%=userPwd%>" />
</form>
</div>
</body>
</html>
<script language="javascript">
myForm.submit();
</script> LoginFromOtherSite.aspx.cs頁面的代碼大致如下：
using (SqlConnection conn = new SqlConnection(SqlHelper.StudentConnectionString))
{
string sql = "select t_stuUser.ID, t_stuUser.stuNumber, t_stuUser.userPassword, t_stuUser.realName, v_stuUser.className, v_stuUser.departmentName "
+ "from t_stuUser,v_stuUser where t_stuUser.stuNumber=@UserName and t_stuUser.userPassword=@UserPwd and v_stuUser.stuNumber=@UserName";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlParameter pUserName = cmd.Parameters.Add("@UserName", SqlDbType.VarChar, 30);
SqlParameter pUserPwd = cmd.Parameters.Add("@UserPwd", SqlDbType.VarChar, 150);
pUserName.Value = Request.Form["UserName"];
pUserPwd.Value = Request.Form["UserPwd"];
conn.Open();
SqlDataReader sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
if (sdr.Read())
{
Session["UserID"] = Convert.ToString(sdr["ID"]);
Session["StuName"] = Convert.ToString(sdr["realName"]);
Session["StuNumber"] = Convert.ToString(sdr["stuNumber"]);
Session["Academe"] = Convert.ToString(sdr["departmentName"]);
Session["ClassName"] = Convert.ToString(sdr["className"]);
Response.Redirect("MyOrder.aspx"); // 登入成功
}
else
{
Response.Redirect("Default.aspx"); //登入失敗，使用者名稱或密碼錯誤
}
}
最後LoginFromOtherSite.aspx頁面處理完兩個網站都是使用者處於登入狀態了。不過我想知道用這種方法哪裡不安全，
可能會產生什麼安全問題，希望有知道的朋友能告訴我下。
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