asp.net上传图片并生成缩略图
<script language="VB" runat="server"> Sub UploadFile(sender As Object, e As EventArgs)
If FileUp.PostedFile.ContentLength = 0 Then FileInfo.Visible = False Exit Sub Else FileInfo.Visible = True FDisplay1.Visible = True End If
FSize.Text ="上传文件大小"+ CStr(FileUp.PostedFile.ContentLength/1024)+"KB" FName.Text = "已上传文件名:"+FileUp.PostedFile.FileName+"<br>"+FName.Text
'写入数据库 on error resume next dim myconn as sqlconnection dim mycomm as sqlcommand dim sql as string dim id as integer Dim image,anewimage As System.Drawing.Image dim width,height,newwidth,newheight as integer Dim callb As System.Drawing.Image.GetThumbnailImageAbort myConn=New sqlconnection(ConfigurationSettings.AppSettings("数据库")) myconn.open() sql="insert into picture (姓名,班级,介绍,属性) values ('"&request.cookies("dgxyl").values("dgxylname")&"','"&request.cookies("dgxyl").values("dgxylbj")&"','"&trim(request("TextBox1"))&"','"&request("r1")&"')" Mycomm=New sqlcommand(sql,myconn) mycomm.executenonquery() myconn.close()
Dim myCommand As New SqlCommand("select top 1 id from picture order by id desc", myConn) myCommand.Connection.Open() Dim myReader As SqlDataReader=mycommand.executereader() if myReader.Read() then id=myReader("id") end if myconn.close() '保存图片 FileUp.PostedFile.SaveAs( Server.MapPath("/classpic/")&cstr(id)&".jpg" ) '生成缩略图 image=System.Drawing.Image.FromFile(Server.MapPath("/classpic/"+cstr(id)+".jpg")) width=image.Width height=image.height if width>height then newwidth=250 newheight=image.height/image.Width*newwidth else newheight=250 newwidth=image.Width/image.height*newheight end if response.write("id="+cstr(id)+"width="+cstr(Width)+";height="+cstr(height)+" ") response.write("newwidth="+cstr(newwidth)+";newheight="+cstr(newheight)+"<br>")
aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr()) aNewImage.Save(Server.MapPath("/smallpic/"+cstr(id)+".jpg")) image.Dispose()
Dim FileSplit() As String = Split( FileUp.PostedFile.FileName, "/" ) Dim FileName As String = FileSplit(FileSplit.Length-1) Dim Exts() As String = Split( FileName, "." ) Dim Ext As String = LCase(Exts(Exts.Length-1))
FDisplay.Text = "<A Target='_blank' HREF='/classpic/"&cstr(id)&".jpg"& "'>查看上传文件</A>" FDisplay1.text="<a href='/picture/default.asp?bj="&cstr(request.cookies("dgxyl").values("dgxylbj"))&"'>返回</a>" End Sub </script> <SCRIPT language=JavaScript> <!-- var requestsubmitted=false; function guestbook_Validator(theForm) { //检查是否从新提交 if (requestsubmitted==true){ alert("你已经提交了留言，请等待服务器应答！"); return(false); } requestsubmitted=true;
return (true); } //--> </SCRIPT> <Html> <Body BgColor=White> <H3 align="center">请正确填写下面各项</h3> <Hr></H3> <Div id="FileInfo" Visible="False" runat="server"> <Asp:Label id="FSize" runat="server"/><br> <Asp:Label id="FName" runat="server"/><br> <Asp:Label id="FDisplay" runat="server"/> <Asp:Label id="FDisplay1" runat="server"/> </Div> <Form Enctype="multipart/form-data" οnsubmit="return guestbook_Validator(this)" runat="server"> 上传文件 <Input Type="File" id="FileUp" runat="server" size="20"><br> 图片属性：<input type="radio" value="<%=request.cookies("dgxyl").values("dgxylbj")%>" name="R1" checked>本班<input type="radio" value="全校" name="R1">全校(本班则只在本班显示，全校则在全校显示)<P> 图片说明：<br> <asp:TextBox id="TextBox1" runat="server" Width="233px" Height="141px"> </asp:TextBox> <asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="请输入图片说明"> </asp:RequiredFieldValidator><br> <Asp:button id="Upload" OnClick="UploadFile" Text="上传图片" runat="server"/> </form> </Body> </Html>
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