SessionA和pplication网上聊天室的网络范例

2022-07-19 08:47:37

<%@ 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 >username：</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username

        //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代码例如以下：

<%@ 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代码例如以下：

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)

    {

        //检測session是否存在，假设没有session值，返回登录页面

        if (Session["s_id"] == "" || Session["s_id"] == null) {

            Response.Redirect("Sample_chat_login.aspx");

        }

            //假设还没有Application["chat"]则创建。假设有则写入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，都应在前台进行检測；

        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");

    }

}

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