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如何在上传的图片上打自己的文字水印
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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>
<%@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>