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asp.net 上傳圖片并同時(shí)生成縮略圖的代碼

更新時(shí)間：2010年02月26日 15:36:38 作者：

asp.net 上傳圖片并同時(shí)生成縮略圖的代碼，需要的朋友可以參考下。

<%@ Page Language="C#" ResponseEncoding="gb2312" %> 
<%@ Import Namespace="System" %> 
<%@ Import Namespace="System.IO" %> 
<%@ Import Namespace="System.Drawing" %> 
<%@ Import Namespace="System.Drawing.Imaging" %> 
<script runat="server"> 
　 
void Page_Load(Object sender, EventArgs e) 
{ 
if (!Page.IsPostBack) 
{ 
ImgPreview.Visible = false; 
} 
} 
void GetThumbnailImage(int width, int height, string strInfo, int left, int right) 
{ 
string file = "Uploads/" + uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf('\\') + 1); 
string newfile = "Uploads/" + uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf('\\') + 1) + ".jpg"; 
string strAdd = strInfo; 
System.Drawing.Image oldimage = System.Drawing.Image.FromFile(Server.MapPath(file)); 
System.Drawing.Image thumbnailImage = 
oldimage.GetThumbnailImage(width, height, new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero); 
Response.Clear(); 
Bitmap output = new Bitmap(thumbnailImage); 
Graphics g = Graphics.FromImage(output); 
g.DrawString(strAdd, new Font("Courier New", 14), new SolidBrush(Color.Red), left, right); 
output.Save(Server.MapPath(newfile), System.Drawing.Imaging.ImageFormat.Jpeg); 
Response.ContentType = "image/gif"; 
ImgPreview.Visible = true; 
ImgPreview.ImageUrl = newfile; 
} 
bool ThumbnailCallback() 
{ 
return true; 
} 
void Button_Click(object sender, EventArgs e) 
{ 
int width, height, left, right; 
string strAddInfo = txtAddInfo.Text; 
width = Int32.Parse(txtWidth.Text); 
height = Int32.Parse(txtHeight.Text); 
left = Int32.Parse(txtLeft.Text); 
right = Int32.Parse(txtRight.Text); 
if (!(uploadFile.PostedFile.ContentLength > 0)) 
{ 
lblErrInfo.Text = "沒(méi)有選擇文件"; 
} 
else 
{ 
string path = Server.MapPath("./Uploads/" + uploadFile.PostedFile.FileName.Substring(uploadFile.PostedFile.FileName.LastIndexOf('\\') + 1)); 
if (File.Exists(path)) 
{ 
lblErrInfo.Text = "已經(jīng)有同名文件"; 
} 
else 
{ 
uploadFile.PostedFile.SaveAs(path); 
GetThumbnailImage(width, height, strAddInfo, left, right); 
} 
} 
} 
</script> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head id="Head1" runat="server"> 
<title>上傳圖片并生成縮略圖</title> 
</head> 
<body> 
<form id="Form1" method="post" enctype="multipart/form-data" runat="server"> 
<p> 
<input id="uploadFile" type="file" runat="server" /> 
<asp:Label ID="lblErrInfo" runat="server" ForeColor="Red"></asp:Label> 
</p> 
<p> 
width:<asp:TextBox ID="txtWidth" runat="server" Width="40px">100</asp:TextBox> 
height:<asp:TextBox ID="txtHeight" runat="server" Width="40px">150</asp:TextBox> 
</p> 
<p> 
添加信息：<asp:TextBox ID="txtAddInfo" runat="server"> AspxBoy.Com</asp:TextBox> 
</p> 
<p> 
信息位置：left:<asp:TextBox ID="txtLeft" runat="server" Width="40px">10</asp:TextBox> 
right:<asp:TextBox ID="txtRight" runat="server" Width="40px">135</asp:TextBox> 
</p> 
<p> 
<input id="button" type="button" value="上傳生成所略圖" onserverclick="Button_Click" runat="server" /> 
</p> 
<p> 
<asp:Image ID="ImgPreview" runat="server"></asp:Image> 
</p> 
<!-- Insert content here --> 
</form> 
</body> 
</html> 

asp.net(vbscript)上傳圖片并同時(shí)生成縮略圖：

復(fù)制代碼代碼如下:

 
　　<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 ="上傳文件大小"+ CStr(FileUp.PostedFile.ContentLength/1024)+"KB" 
　　FName.Text = "已上傳文件名:"+FileUp.PostedFile.FileName+"<br>"+FName.Text 
　　"寫入數(shù)據(jù)庫(kù) 
　　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("數(shù)據(jù)庫(kù)")) 
　　myconn.open() 
　　sql="insert into picture (姓名,班級(jí),介紹,屬性) 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() 
　　"保存圖片 
　　FileUp.PostedFile.SaveAs( Server.MapPath("\classpic\")&cstr(id)&".jpg" ) 
　　"生成縮略圖 
　　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"& "">查看上傳文件</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) 
　　{ 
　　//檢查是否從新提交 
　　if (requestsubmitted==true){ 
　　alert("你已經(jīng)提交了留言，請(qǐng)等待服務(wù)器應(yīng)答！"); 
　　return(false); 
　　} 
　　requestsubmitted=true; 
　　return (true); 
　　} 
　　//--> 
　　</SCRIPT> 
<Html> 
　　<Body BgColor=White> 
　　<H3 align="center">請(qǐng)正確填寫下面各項(xiàng)</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" onsubmit="return guestbook_Validator(this)" runat="server"> 
　　上傳文件 
　　<Input Type="File" id="FileUp" runat="server" size="20"><br> 
　　圖片屬性：<input type="radio" value="<%=request.cookies("dgxyl").values("dgxylbj")%>" name="R1" checked>本班<input type="radio" value="全　　校" name="R1">全校(本班則只在本班顯示，全校則在全校顯示)<P> 
　　圖片說(shuō)明：<br> 
　　<asp:TextBox id="TextBox1" runat="server" Width="233px" Height="141px"> 
　　</asp:TextBox> 
　　<asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="請(qǐng)輸入圖片說(shuō)明"> 
　　</asp:RequiredFieldValidator><br> 
　　<Asp:button id="Upload" OnClick="UploadFile" Text="上傳圖片" runat="server"/> 
　　</form> 
　　<Hr> 
　　<p>注意：</p> 
　　<ol> 
　　<li><b>嚴(yán)禁上傳污染環(huán)境的照片，否則賬號(hào)將被刪除！</b></li> 
　　<li><font color="#808000"><b>請(qǐng)?jiān)敿?xì)填寫照片說(shuō)明，圖片說(shuō)明不詳細(xì)將會(huì)被視為亂傳圖片，將會(huì)被刪除！</b></font></li> 
　　</ol> 
　　</Body> 
　　</Html> 