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如何在上传的图片上打自己的文字水印

2015-06-28 00:00作者:网管联盟

很多时候需要在用户上传的图片上加上版权或者一些其他的附加文字信息,如何实现这样的功能,下面帖个简单实现的例子,起到抛砖引玉的作用。


<%@PageLanguage=&c#&Debug=&true&Trace=&true&%>
<%@ImportNamespace=&System.IO&%>
<%@ImportNamespace=&System.Drawing&%>
<%@ImportNamespace=&System.Drawing.Imaging&%>
<html>
<scriptrunat=server>
voidUploadBtn_Click(Objectsender,EventArgse){
Stringfilename;
Stringfilename1;
String[]filename2;
intq;
filename=UploadFile.PostedFile.FileName;
filename2=filename.Split(newChar[]{'\'});
q=filename2.GetUpperBound(0);
filename1=filename2[q];
dis.Text=&上传文件名:&+filename1+&<br>&;
UploadFile.PostedFile.SaveAs(Server.MapPath(filename1));
ImageEditor.Visible=true;
dis.Text+=&文件大小:&+UploadFile.PostedFile.ContentLength+&字节数&;
Image1.Src=filename1;
}
voidUpdateBtn_Click(Objectsender,EventArgse){
Stringfilename1;
filename1=Image1.Src;
System.Drawing.Imageimage=System.Drawing.Image.FromFile(Server.MapPath(filename1));
System.Drawing.Imagenewimage=newBitmap(image.Width,image.Height,PixelFormat.Format32bppRGB);
Graphicsg=Graphics.FromImage(newimage);
g.DrawImage(image,0,0,image.Width,image.Height);
Fontf=newFont(FontType.SelectedItem.Text,Int32.Parse(FontSize.SelectedItem.Text));
Brushb=newSolidBrush(Color.Red);
g.DrawString(Caption.Text,f,b,10,140);
g.Dispose();
System.Drawing.ImagethumbImage=newimage.GetThumbnailImage(Int32.Parse(Width.Text),Int32.Parse
(Height.Text),null,0);
image.Dispose();
thumbImage.Save(Server.MapPath(filename1),ImageFormat.JPEG);
Image1.Src=filename1;
Caption.Text=&&;

}

</script>

<body>
<asp:labelid=&dis&runat=server/>
<formenctype=&multipart/form-data&runat=server>
选择上传文件:<inputid=&UploadFile&type=filerunat=server>
<asp:buttonText=&UploadMe!&OnClick=&UploadBtn_Click&runat=server/>
<hr>
<asp:panelid=&ImageEditor&Visible=falserunat=server>
<imgID=&Image1&src=&&runat=&server&/>
图像宽度:<asp:textboxid=&Width&runat=server/>
图像高度:<asp:textboxid=&Height&runat=server/><br>
文本标题:<asp:textboxid=&Caption&runat=server/>
标题字号:<asp:dropdownlistid=&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>
标题字体:<asp:dropdownlistid=&FontType&runat=server>
<asp:listitem>黑体</asp:listitem>
<asp:listitem>仿宋</asp:listitem>
<asp:listitem>隶书</asp:listitem>
<asp:listitem>楷书</asp:listitem>
<asp:listitem>彩云</asp:listitem>
<asp:listitem>新魏</asp:listitem>
</asp:dropdownlist>

<asp:buttonText=&UpdateImage&OnClick=&UpdateBtn_Click&runat=server/>
</asp:panel>
</form>

</body>
</html>

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