AJAX实现防止Session过期

来源：互联网发布：java日期选择控件编辑：程序博客网时间：2024/05/29 10:16

利用前端Ajax过段时间加载一次后台防止Session过期

前台代码

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="js/Jquery1.7.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
function post() {
$.ajax({
type: "post",
contentType: "application/json",
url: "WebBlock.aspx"
})
}
setInterval(post,30000)
})
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server" Height="409px" TextMode="MultiLine"
Width="449px"></asp:TextBox>
<asp:Button ID="Button1"
runat="server" Text="保存" OnClientClick="" onclick="Button1_Click" />
</div>
</form>
</body>
</html>

后台代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;

namespace WebApplication2
{
public partial class WebBlock : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

protected void Button1_Click(object sender, EventArgs e)
{
if (Session["user"] != null)
{
FileStream stream = File.Open(@"d:\1.txt", FileMode.OpenOrCreate, FileAccess.Write);//向电脑中写入数据
StreamWriter writer = new StreamWriter(stream);
writer.Write(TextBox1.Text);
writer.Dispose();
stream.Dispose();
}
else
{
Response.Redirect("Error.aspx");//当Session没传过来时执行此语句
}
}
}
}