ASP+上传文件语法

March 25,2004

这里有一个怎样用ASP+上传文件的非常简单例子
<html>

<script language="VB" runat=server>

   Sub UploadBtn_Click(Sender as Object, E as EventArgs)

      UploadFile.PostedFile.SaveAs(Server.MapPath("test.jpg"))
      MyImage.ImageUrl = "test.jpg"
      MyImage.Visible = true

   End Sub

</script>

<body>

   <form enctype="multipart/form-data" runat=server>

      <h3>

         选择上传文件: <input id="UploadFile" type=file runat=server>

      <asp:button Text="Upload Me!" OnClick="UploadBtn_Click" runat=server/>

      <hr>

      <asp:image id="MyImage" Visible=false runat=server/>

   </form>

</body>
</html>

Here is a more complex example, which enables you to upload a file, and then using the System.Drawing APIs
to resize/crop the image, overlay a custom text message onto the image, and then save it back out to disk
as a .jpg (note that this sample works with *any* browser).  I've written this one in C# -- but you would
obviously be able to use VB or JScript to do it as well:

<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>

<html>

<script language="C#" runat=server>

   void UploadBtn_Click(Object sender, EventArgs e) {

      UploadFile.PostedFile.SaveAs(Server.MapPath("test.jpg"));
      ImageEditor.Visible = true;
   }

   void UpdateBtn_Click(Object sender, EventArgs e) {

      System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath("test.jpg"));
      System.Drawing.Image newimage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppRGB);

      Graphics g = Graphics.FromImage(newimage);
      g.DrawImage(image,0,0,image.Width,image.Height);
      Font f = new Font("Lucida Sans Unicode", Int32.Parse(FontSize.SelectedItem.Text));
      Brush b = new SolidBrush(Color.Red);
      g.DrawString(Caption.Text, f, b, 10, 140);
      g.Dispose();

      System.Drawing.Image thumbImage = newimage.GetThumbnailImage(Int32.Parse(Width.Text),Int32.Parse
(Height.Text),null,0);
      image.Dispose();

      thumbImage.Save(Server.MapPath("test.jpg"), ImageFormat.JPEG);
   }

</script>

<body>

   <form enctype="multipart/form-data" runat=server>

      <h3>

      Select File To Upload: <input id="UploadFile" type=file runat=server>

      <asp:button Text="Upload Me!" OnClick="UploadBtn_Click" runat=server/>

      <hr>

      <asp:panel id="ImageEditor" Visible=false runat=server>

         <img src="test.jpg">

         <h3>
            Image Width: <asp:textbox id="Width" runat=server/>

               Image Height: <asp:textbox id="Height" runat=server/> <br>

               Text Caption: <asp:textbox id="Caption" runat=server/>

               Caption Size: <asp:dropdownlist id="FontSize" runat=server>
                                       <asp:listitem>14</asp:listitem>
                                       <asp:listitem>18</asp:listitem>
                                       <asp:listitem>26</asp:listitem>
                                       <asp:listitem>36</asp:listitem>
                                       <asp:listitem>48</asp:listitem>
                                       <asp:listitem>62</asp:listitem>
                                    </asp:dropdownlist>

               <asp:button Text="Update Image" OnClick="UpdateBtn_Click" runat=server/>

         </h3>
      </asp:panel>

   </form>

</body>
</html>