Session和Application实现网络在线聊天室实例

浏览数：20 / 时间：2015年06月11日

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Sample_chat_login.aspx.cs" Inherits="Sample_chart_login" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css" >
body { width:780px; margin:0px auto;}
form { width:400px; margin:0px auto;}
h3 { margin:10px; padding:10px; text-align:center;}
p.tc { text-align:center; }


</style>
</head>
<body>
<form id="form1" runat="server" defaultbutton="Button1" defaultfocus="txt_id">
<div>
<h3>聊天室登录</h3>

<div>
<p class="tc">
<span >用户名：</span>
<asp:TextBox ID="txt_id" runat="server"></asp:TextBox> </p>

<p class="tc">
<asp:Button ID="Button1" runat="server" Text="登录聊天室" onclick="Button1_Click" />
</p>
</div>

</div>
</form>
</body>
</html>

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

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

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        //记录session: 当前用户名
        //跳转至聊天室页面
        if (txt_id.Text != "") {
            Session["s_id"] = txt_id.Text;
            Server.Transfer("Sample_chat_room.aspx");
        }
    }
}

room.aspx代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Sample_chat_room.aspx.cs" Inherits="Sample_chat_room" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>

<style type="text/css" >
body { width:780px; margin:0px auto;}

h3 { margin:10px; padding:10px; text-align:center;}
p.tc { text-align:center; }

#pnl_chat
{ margin:10px; padding:10px;
border:1px solid #dadada;
height:300px;
}
#div_ctls
{ margin:10px; padding:10px;
border:1px solid #dadade;
}
</style>

</head>
<body >
<form id="form1" runat="server" defaultbutton="Button1" defaultfocus="txt_word">
<div>
<h3>简易聊天室</h3>

<asp:Panel ID="pnl_chat" runat="server" ScrollBars="Vertical">
</asp:Panel>

<div id="div_ctls">
<p>
<asp:TextBox ID="txt_word" runat="server" Width="400"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="发送" onclick="Button1_Click" />
 
<asp:Button ID="Button2" runat="server" Text="刷新聊天记录" />
 
<asp:Button ID="Button4" runat="server" Text="清空" onclick="Button4_Click" />
 
<asp:Button ID="Button3" runat="server" Text="退出聊天" onclick="Button3_Click" />
</p>

<p>
<span>选择我的颜色：</span>

<asp:DropDownList ID="ddl_color" runat="server">
<asp:ListItem Value="#666666">默认</asp:ListItem>
<asp:ListItem Value="red">红色</asp:ListItem>
<asp:ListItem Value="green">绿色</asp:ListItem>
<asp:ListItem Value="blue">蓝色</asp:ListItem>
</asp:DropDownList>

</p>
</div>

</div>
</form>
</body>
</html>

room.aspx.cs代码如下：

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

public partial class Sample_chat_room : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //检测session是否存在，如果没有session值，返回登录页面
        if (Session["s_id"] == "" || Session["s_id"] == null) {
            Response.Redirect("Sample_chat_login.aspx");
        }


        

            //如果还没有Application["chat"]则创建，如果有则写入panel
            if (Application["chat"] != null)
            {
                pnl_chat.Controls.Add((Panel)Application["chat"]);
            }
            else
            {
                Panel _pnl = new Panel();
                Application["chat"] = _pnl;
            }
        

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if(txt_word.Text !="") { // 注意：实际应用中，文本框是否为空，都应在前台进行检测；

        Label lab_name = new Label();
        lab_name.Text = Session["s_id"].ToString() + "[" + DateTime.Now.ToLongTimeString() + "]:";

        Label lab_word = new Label();
        lab_word.Style.Add("color", ddl_color.SelectedValue);
        lab_word.Text = txt_word.Text;

        Literal br = new Literal();
        br.Text = "<br/>";

        Panel _apppnl = (Panel)Application["chat"];
        _apppnl.Controls.AddAt(0, br);
        _apppnl.Controls.AddAt(0, lab_word);
        _apppnl.Controls.AddAt(0, lab_name);
            
        //_apppnl.Controls.Add(lab_name);
        //_apppnl.Controls.Add(lab_word);
        //_apppnl.Controls.Add(br);

        Application.Lock();
        Application["chat"] = _apppnl;
        Application.UnLock();

         

        //清空文本框
        txt_word.Text = "";

        pnl_chat.Controls.Add((Panel)Application["chat"]);
        

        }
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        Session.Remove("s_id");
        Response.Redirect("Sample_chat_login.aspx");

    }
    protected void Button2_Click(object sender, EventArgs e)
    {

    }
    protected void Button4_Click(object sender, EventArgs e)
    {
        Application.Lock();
        Application.Remove("chat");
        Application.UnLock();

        Server.Transfer("Sample_chat_room.aspx");
    }
}