在ASP+中使用Cookie

March 25,2004

<%@ Page Language="VB" %>

<script language="VB" runat="server">
Const COOKIE_NAME  As String = "test-cookie-name"
Const COOKIE_VALUE As String = "test-cookie-value"

' Declare our cookie object
Dim objCookieObject As HttpCookie

Sub btnSetCookie_OnClick(Sender As Object, E As EventArgs)
      ' Create a cookie object - I'm passing name and value,
      ' but you can also pass in a name and set the value later.
      ' ie. objCookieObject = New HttpCookie(COOKIE_NAME)
      objCookieObject = New HttpCookie(COOKIE_NAME, COOKIE_VALUE)

      ' We already set these above!
      'objCookieObject.Name = COOKIE_NAME
      'objCookieObject.Value  = COOKIE_VALUE

      ' Additional cookie properties:
      objCookieObject.Expires = New DateTime(2001, 12, 31, 23, 59, 59)

      ' Normally you can leave these alone.
      ' The defaults will work fine for most uses.
      'objCookieObject.Domain  = "www.domain.com"
      'objCookieObject.Path = "/path/"
      'objCookieObject.Secure  = True

      Response.AppendCookie(objCookieObject)
End Sub

Sub btnRemoveCookie_OnClick(Sender As Object, E As EventArgs)
      objCookieObject = New HttpCookie(COOKIE_NAME)

      ' Expire it on the day I was born just so we're sure it's a date in the past.
      objCookieObject.Expires = New DateTime(1974, 11, 12)

      Response.AppendCookie(objCookieObject)
End Sub

Sub btnGetCookie_OnClick(Sender As Object, E As EventArgs)
      objCookieObject = Request.Cookies(COOKIE_NAME)

      If Not(objCookieObject = null) Then
         lblCookieDetails.Text       = objCookieObject.Name

         lblCookieDetailsName.Text = objCookieObject.Name
         lblCookieDetailsValue.Text = objCookieObject.Value
         lblCookieDetailsExpires.Text = objCookieObject.Expires.ToString
         lblCookieDetailsDomain.Text  = objCookieObject.Domain
         lblCookieDetailsPath.Text = objCookieObject.Path
         lblCookieDetailsSecure.Text  = objCookieObject.Secure.ToString
         lblCookieDetailsHasKeys.Text = objCookieObject.HasKeys.ToString
      Else
         lblCookieDetails.Text       = "Cookie Not Set!"

         lblCookieDetailsName.Text = ""
         lblCookieDetailsValue.Text = ""
         lblCookieDetailsExpires.Text = ""
         lblCookieDetailsDomain.Text  = ""
         lblCookieDetailsPath.Text = ""
         lblCookieDetailsSecure.Text  = ""
         lblCookieDetailsHasKeys.Text = ""
      End If

      ' I'm ignoring collections.  They're outside the realm of this basic sample.
      ' FYI: Additional properties related to cookie collections: Values, Item
End Sub
</script>

<html>
<body>

<h4>The cookie name we're using for this sample is: <em><%= COOKIE_NAME %></em></h4>

<form action="cookies.aspx" method="post" runat="server">
<asp:Button type="submit" id="btnSetCookie" text="Set Cookie" OnClick="btnSetCookie_OnClick"
runat="server" />
<asp:Button type="submit" id="btnRemoveCookie" text="Remove Cookie"
OnClick="btnRemoveCookie_OnClick" runat="server" />

<p>
To see the cookie's current status you'll need to click below.  This is because the response
which adds or deletes the cookie happens after the request is already done.  As such, those changes aren't
available from the request collection until the next request.
</p>

<asp:Button type="submit" id="btnGetCookie" text="Get Cookie Details"
OnClick="btnGetCookie_OnClick" runat="server" />
</form>

<p>
<strong>Details of:</strong> <asp:label id="lblCookieDetails" runat="server" />
</p>

<table border="1">
<thead>
      <tr>
         <th>Property</th>
         <th>Value</th>
      </tr>
</thead>
<tbody>
      <tr>
         <td>Name</td>
         <td><asp:label id="lblCookieDetailsName" runat="server" /></td>
      </tr>
      <tr>
         <td>Value</td>
         <td><asp:label id="lblCookieDetailsValue" runat="server" /></td>
      </tr>
      <tr>
         <td>Expires</td>
         <td><asp:label id="lblCookieDetailsExpires" runat="server" /></td>
      </tr>
      <tr>
         <td>Domain</td>
         <td><asp:label id="lblCookieDetailsDomain" runat="server" /></td>
      </tr>
      <tr>
         <td>Path</td>
         <td><asp:label id="lblCookieDetailsPath" runat="server" /></td>
      </tr>
      <tr>
         <td>Secure</td>
         <td><asp:label id="lblCookieDetailsSecure" runat="server" /></td>
      </tr>
      <tr>
         <td>Has Keys</td>
         <td><asp:label id="lblCookieDetailsHasKeys" runat="server" /></td>
      </tr>
</tbody>
</table>

</body>
</html>