asp.net 上傳圖片并同時生成縮略圖的代碼

2024-07-10 13:26:50

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復制代碼代碼如下:

<%@ 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 runat="server">
<title>上傳圖片并生成縮略圖</title>
</head>
<body>
<form method="post" enctype="multipart/form-data" runat="server">
<p>
<input type="file" runat="server" />
<asp:Label runat="server" ForeColor="Red"></asp:Label>
</p>
<p>
width:<asp:TextBox runat="server">100</asp:TextBox>
height:<asp:TextBox runat="server">150</asp:TextBox>
</p>
<p>
添加信息：<asp:TextBox runat="server"> AspxBoy.Com</asp:TextBox>
</p>
<p>
信息位置：left:<asp:TextBox runat="server">10</asp:TextBox>
right:<asp:TextBox runat="server">135</asp:TextBox>
</p>
<p>
<input type="button" value="上傳生成所略圖" onserverclick="Button_Click" runat="server" />
</p>
<p>
<asp:Image runat="server"></asp:Image>
</p>

</form>
</body>
</html>

asp.net(vbscript)上傳圖片并同時生成縮略圖：

復制代碼代碼如下:

<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
　　"寫入數據庫
　　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("數據庫"))
　　myconn.open()
　　sql="insert into picture (姓名,班級,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>
　　
　　</SCRIPT>
<Html>
　　<Body BgColor=White>
　　<H3>請正確填寫下面各項</h3>
　　<Hr></H3>
　　<Div Visible="False" runat="server">
　　<Asp:Label runat="server"/><br>
　　<Asp:Label runat="server"/><br>
　　<Asp:Label runat="server"/>
　　<Asp:Label runat="server"/>
　　</Div>
　　<Form Enctype="multipart/form-data" onsubmit="return guestbook_Validator(this)" runat="server">
　　上傳文件
　　<Input Type="File" runat="server" size="20"><br>
　　圖片屬性：<input type="radio" value="<%=request.cookies("dgxyl").values("dgxylbj")%>" checked>本班<input type="radio" value="全　　校">全校(本班則只在本班顯示，全校則在全校顯示)<P>
　　圖片說明：<br>
　　<asp:TextBox runat="server">
　　</asp:TextBox>
　　<asp:RequiredFieldValidator runat="server" ControlToValidate="TextBox1" ErrorMessage="請輸入圖片說明">
　　</asp:RequiredFieldValidator><br>
　　<Asp:button Text="上傳圖片" runat="server"/>
　　</form>
　　<Hr>
　　<p>注意：</p>
　　<ol>
　　<li><b>嚴禁上傳污染環境的照片，否則賬號將被刪除！</b></li>
　　<li><font color="#808000"><b>請詳細填寫照片說明，圖片說明不詳細將會被視為亂傳圖片，將會被刪除！</b></font></li>
　　</ol>
　　</Body>
　　</Html>