ASP.NET网站聊天室的设计与实现(第3节) |
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本文标签：ASP.NET,网站聊天室 大家都玩过网站聊天室吧，那知道它是怎么实现的吗？
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Application["user_online"] == null)
{
Application["user_online"] = 0;
}
Application["user_online"] = (int)Application["user_online"] + 1;
Label3.Text = "(现在共有" + Application["user_online"].ToString() + "人在线!)";
}
protected void Button1_Click(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
Session["User_name"]=this.Txt1.Text;
Response.Redirect("chat.aspx");
}
}
}
第二步，构建登录字符串与发言字符串
protected void Page_Load(object sender, EventArgs e)
{
string user_name = (string)Session["user_name"];
string sayStr = "来自" + (string)Request.ServerVariables["REMOTE_ADDR"] + "的";
sayStr = sayStr + "<b><font color=red>" + user_name + "</font></b>";
sayStr = sayStr + "于" + DateTime.Now + "大驾光临";
Application.Lock();
Application["show"] = sayStr + "<br>" + Application["show"];I=I+1
Application.UnLock();
}
3、构建发言内容字符串 。创建输入发言内容的页面文件Inputwin.aspx 。为页面Inputwin.aspx添加控件，这里使用两个DropDownList下拉列表框控件，分别用来选择发言人的性别和心情，一个单行Textbox控件(对谁说)；一个多行Textbox控件(发言内容)；一个Button按钮(发言按钮)，最后添加验证控件 。
protected void Button1_Click(object sender, EventArgs e)
{
if (Page.IsPostBack == true) //页面数据回传
{
String ssex, emotion, who;
ssex = DropDownList1.SelectedItem.Value; //获取性别
emotion = DropDownList2.SelectedItem.Text + "的"; //获取发言时表情
who = "对" + "<b>" + TextBox2.Text + "</b>"; //获取对谁说
//构建发言字符串:
String sayStr = "<font size=3 color=00ff00><b>" + (string)Session["user_name"];
sayStr = sayStr + ssex + "</b></font>在" + DateTime.Now + emotion + who + " 说：";
sayStr = sayStr + TextBox3.Text;
Application.Lock();
Application["show"] = sayStr + "<br>" + (string)Application["show"];
Application.UnLock();
TextBox3.Text = "";// 将发言框清空
}
}
4、创建显示发言字符串和发言内容的页面文件(Showwin.aspx),实现代码如下： <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>无标题页</title> <meta http-equiv="refresh" content="4"/> </head> <body> <form id="form1" runat="server"> <div> </div> </form> </body> </html> 在Showwin.aspx.cs的Page_Load事件中编写代码如下：
public partial class showwin : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.Write((string)Application["show"]);
}
}
5、为离开聊天室页面的Exit.aspx.cs文件编写代码如下：
protected void Page_Load(object sender, EventArgs e)
{
string sayStr = "<b>" + (string)Session["user_name"] + "</b>";
sayStr = sayStr + "于" + DateTime.Now + "离开聊天室了";
sayStr = "<font color=green>" + sayStr + "</font>";
Application.Lock();
Application["show"] = sayStr + "<br>" + (string)Application["show"];
Application["user_online"] = (int)Application["user_online"] - 1;
Application.UnLock();
Response.Redirect("chatroom.aspx");
}
6、运行聊天室首页Default.aspx 。 运行效果图
总结 |
