正在阅读：.net中即时消息发送的实现…….net中即时消息发送的实现……

2004-02-14 09:34 出处：PConline 作者：icefox/ASPCool.com 责任编辑：zwg

.net中即时消息发送的实现…… 用了我一下午的时间终于写完并整理好了利用.net来发送即时消息的材料（当然了，还有上午的数据库设计：）数据库设计：info表：id fromstu_id tostu_id content term 其中id是主键，fromstu_id是发送信息的用户的学号（这是和我做的学友录连在一起的），tostu_id是接受信息的用户的学号，content是消息的内容，term是判断是否为新消息。下面的代码家在校友录中的if not ispostback中 '/////////////////////判断是否有新留言，将自动弹出页面这里还要将页面的刷新时间设置一下，以便可以循环的读取信息。 Dim mysql As String = "select * from info where tostu_id=@myid and term=1" Dim comm As SqlCommand = New SqlCommand(mysql, conn) comm.Parameters.Add(New SqlParameter("@myid", SqlDbType.Int, 4)) comm.Parameters("@myid").Value = Session("stu_id") Dim dr As SqlDataReader conn.Open() dr = comm.ExecuteReader If dr.Read Then Response.Write("< script language=JavaScript >window.open ('info.aspx','','height=330,width=560,status=no,location=no,toolbar=no, directories=no,menubar=no')< /script >") End If dr.Close() comm.Cancel()

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下面的代码是用来发送即时消息的页面，其中里面分了两个部分，一个是用来回复的，一个是用来专门发送的，两个的页面稍有区别，仔细看一下就会明白的：） 下面是所有的代码：codebehind部分 Public Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load If Not IsPostBack Then Dim tostu_id As String = Request.QueryString("tostu_id") If tostu_id = "" Then '//////////////////当回复留言时 Dim sql As String = "select a.*,b.nick from info a,pwd b where a.fromstu_id=b.stu_id and a.tostu_id='" & Session("stu_id") & "' and a.term=1" Dim comm As SqlCommand = New SqlCommand(sql, conn) Dim dr As SqlDataReader conn.Open() dr = comm.ExecuteReader While dr.Read Label3.Text = dr.Item("nick") Label4.Text = dr.Item("tim") Label5.Text = dr.Item("content") TextBox1.Text = dr.Item("nick") TextBox3.Text = dr.Item("fromstu_id") TextBox1.Enabled = False Label8.Visible = False End While dr.Close() comm.Cancel() '//////////////////////更新留言使留言属性为已阅读过 Dim sql_1 As String = "update info set term=0 where tostu_id='" & Session("stu_id") & "' and term=1 and tim='" & Label4.Text & "'" comm = New SqlCommand(sql_1, conn) comm.ExecuteNonQuery() Else '////////////////////当发送留言时 Dim mysql As String = "select nick from pwd where stu_id='" & tostu_id & "'" Dim comm As SqlCommand = New SqlCommand(mysql, conn) Dim dr As SqlDataReader conn.Open() dr = comm.ExecuteReader While dr.Read TextBox1.Text = dr.item("nick") End While TextBox1.Enabled = False Label3.Text = "" Label4.Text = "" Label5.Visible = False Label8.Visible = True Label6.Visible = False Label7.Visible = False Label9.Visible = False dr.close() End If End If End Sub '/////////////////书写提交消息事件 Public Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim tostu_id As String = Request.QueryString("tostu_id") If tostu_id = "" Then '/////////////////////////当回复留言时 conn.Open() Dim sql As String = "insert into info(fromstu_id,tostu_id,content,term,tim) values(@fromstu_id,@tostu_id,@content,@term,@tim)" Dim comm As SqlCommand = New SqlCommand(sql, conn) comm.Parameters.Add(New SqlParameter("@fromstu_id", SqlDbType.Int, 4)) comm.Parameters("@fromstu_id").Value = Session("stu_id") comm.Parameters.Add(New SqlParameter("@tostu_id", SqlDbType.Int, 4)) comm.Parameters("@tostu_id").Value = TextBox3.Text comm.Parameters.Add(New SqlParameter("@content", SqlDbType.VarChar, 200)) comm.Parameters("@content").Value = TextBox2.Text comm.Parameters.Add(New SqlParameter("@term", SqlDbType.Int, 4)) comm.Parameters("@term").Value = "1" comm.Parameters.Add(New SqlParameter("@tim", SqlDbType.Char, 20)) comm.Parameters("@tim").Value = Date.Now comm.ExecuteNonQuery() TextBox2.Text = "" Else '/////////////////////////当发送留言时 conn.Open() Dim sql As String = "insert into info(fromstu_id,tostu_id,content,term,tim) values(@fromstu_id,@tostu_id,@content,@term,@tim)" Dim comm As SqlCommand = New SqlCommand(sql, conn) comm.Parameters.Add(New SqlParameter("@fromstu_id", SqlDbType.Int, 4)) comm.Parameters("@fromstu_id").Value = Session("stu_id") comm.Parameters.Add(New SqlParameter("@tostu_id", SqlDbType.Int, 4)) comm.Parameters("@tostu_id").Value = tostu_id comm.Parameters.Add(New SqlParameter("@content", SqlDbType.VarChar, 200)) comm.Parameters("@content").Value = TextBox2.Text comm.Parameters.Add(New SqlParameter("@term", SqlDbType.Int, 4)) comm.Parameters("@term").Value = "1" comm.Parameters.Add(New SqlParameter("@tim", SqlDbType.Char, 20)) comm.Parameters("@tim").Value = Date.Now comm.ExecuteNonQuery() TextBox2.Text = "" End If Response.Write("< script language=javascript >alert('发送成功！')< /script >") End Sub '////////////////////返回继续发送 Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Response.Redirect("boaman.aspx") End Sub End Class

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页面部分： < %@ Page Language="vb" AutoEventWireup="false" Codebehind="info.aspx.vb" Inherits="_99re1.info"% > < !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > < HTML > < HEAD > < title >< /title > < meta content="Microsoft Visual Studio.NET 7.0" name="GENERATOR" > < meta content="Visual Basic 7.0" name="CODE_LANGUAGE" > < meta content="JavaScript" name="vs_defaultClientScript" > < meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema" > < /HEAD > < body background="image/bg.gif" MS_POSITIONING="GridLayout" > < form id="Form1" method="post" runat="server" > < FONT face="宋体" > < asp:image id="Image3" style="Z-INDEX: 111; LEFT: 141px; POSITION: absolute; TOP: 312px" runat="server" Width="221px" Height="98px" ImageUrl="image/99re1-1.gif" >< /asp:image > < asp:textbox id="TextBox1" style="Z-INDEX: 101; LEFT: 73px; POSITION: absolute; TOP: 123px" runat="server" BorderColor="Navy" BorderWidth="1px" >< /asp:textbox > < asp:label id="Label1" style="Z-INDEX: 102; LEFT: 26px; POSITION: absolute; TOP: 127px" runat="server" Width="42px" Height="18px" Font-Size="X-Small" ForeColor="Navy" Font-Bold="True" >发往：< /asp:label > < asp:label id="Label2" style="Z-INDEX: 103; LEFT: 26px; POSITION: absolute; TOP: 156px" runat="server" Font-Size="X-Small" ForeColor="Navy" Font-Bold="True" >内容：< /asp:label > < asp:textbox id="TextBox2" style="Z-INDEX: 104; LEFT: 73px; POSITION: absolute; TOP: 154px" runat="server" TextMode="MultiLine" Width="449px" Height="74px" BorderColor="Navy" BorderWidth="1px" MaxLength="200" >< /asp:textbox > < asp:button id="Button1" style="Z-INDEX: 105; LEFT: 357px; POSITION: absolute; TOP: 252px" runat="server" Width="50px" Height="20px" Text="发送" BorderColor="Navy" BorderWidth="1px" BackColor="#FFE0C0" >< /asp:button > < asp:button id="Button2" style="Z-INDEX: 106; LEFT: 176px; POSITION: absolute; TOP: 253px" runat="server" Width="87px" Height="20px" Text="继续发送…" BorderColor="Navy" BorderWidth="1px" BackColor="#FFE0C0" >< /asp:button > < asp:label id="Label3" style="Z-INDEX: 107; LEFT: 75px; POSITION: absolute; TOP: 10px" runat="server" Width="135px" Height="6px" Font-Size="Small" >Label< /asp:label > < asp:label id="Label4" style="Z-INDEX: 108; LEFT: 300px; POSITION: absolute; TOP: 9px" runat="server" Width="219px" Height="13px" Font-Size="Small" >Label< /asp:label > < asp:label id="Label5" style="Z-INDEX: 109; LEFT: 73px; POSITION: absolute; TOP: 40px" runat="server" Width="447px" Height="71px" Font-Size="X-Small" BorderColor="SlateGray" BorderWidth="1px" >Label< /asp:label > < asp:label id="Label6" style="Z-INDEX: 110; LEFT: 26px; POSITION: absolute; TOP: 12px" runat="server" Font-Size="X-Small" ForeColor="Red" Font-Bold="True" >来自：< /asp:label > < asp:TextBox id="TextBox3" style="Z-INDEX: 112; LEFT: 247px; POSITION: absolute; TOP: 122px" runat="server" Visible="False" >< /asp:TextBox > < asp:Label id="Label8" style="Z-INDEX: 113; LEFT: 116px; POSITION: absolute; TOP: 55px" runat="server" Height="33px" Width="327px" Font-Bold="True" ForeColor="Navy" Font-Size="Large" Font-Names="方正姚体" Font-Underline="True" >直接写入内容点击发送即可！< /asp:Label > < asp:Label id="Label7" style="Z-INDEX: 114; LEFT: 225px; POSITION: absolute; TOP: 12px" runat="server" Height="15px" Width="71px" Font-Bold="True" ForeColor="Red" Font-Size="X-Small" >发信日期：< /asp:Label > < asp:Label id="Label9" style="Z-INDEX: 115; LEFT: 25px; POSITION: absolute; TOP: 41px" runat="server" Font-Bold="True" ForeColor="Red" Font-Size="X-Small" >内容：< /asp:Label > < /FONT > < /form > < /body > < /HTML > 以上代码在bata2环境下调试成功. 特别感谢：cheery_ke提供思路！朋友一生一起走，多一个朋友就多一分收获！