asp.net
程序代码
<html><title>如何在图片上写字</title>
<body>
<asp:Label id="dis" runat=server/>
<form enctype="multipart/form-data" runat=server ID="Form1">
选择上传文件:<input id="UploadFile" type=file runat=server NAME="UploadFile">
<asp:Button Text="Upload Me!" runat=server ID="Button1"/>
<hr>
<asp:Panel id="ImageEditor" Visible=false runat=server>
<img ID="Image1" src="" runat="server"/>
图象宽度:<asp:TextBox id="Width" runat="server"/>
图象高度:<asp:TextBox id="Height" runat="server"/>
文本标题:<asp:TextBox id="Caption" runat="server"/>
标题字号:<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>
标题字体:<asp:DropDownList id="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:button Text="Update Image" runat="server" ID="Button2"/>
</asp:Panel>
</form>
</body>
</html>
后台代码
说明:
1.加图片和加文字不能共存的就是你只能用一种
2.加图片的时候必须要保证你被加的水印的图片3.png在(可以自己改其他,程序中也要改)
必须有这个存放图片的文件夹,uploadfile(可以自己改其他,程序中也要改)
3.要改变文字，图片的位置必须在程序中改.
程序代码
public void UploadBtn_Click(Object sender,EventArgs e) {
String filename;
String filename1;
String[] filename2;
int q;
filename=UploadFile.PostedFile.FileName;
filename2=filename.Split(new Char[] {'\\'});
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;
}
void UpdateBtn_Click(Object sender, EventArgs e) {
String filename1;
filename1=Image1.Src;
//加文字水印，注意，这里的代码和以下加图片水印的代码不能共存
// System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath(filename1));
//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(FontType.SelectedItem.Text, Int32.Parse(FontSize.SelectedItem.Text));
//Brush b = new SolidBrush(Color.AntiqueWhite);
//g.DrawString(Caption.Text, f, b, 100, 140);
//g.Dispose();
//加图片水印
System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath(filename1));//原图
System.Drawing.Image newimage = System.Drawing.Image.FromFile( Server.MapPath("3.png"));//此对象为被加的水印图
Graphics g = Graphics.FromImage(image);
g.DrawImage(newimage, new Rectangle(image.Width-newimage.Width, image.Height-newimage.Height, newimage.Width, newimage.Height), 0, 0, newimage.Width, newimage.Height, GraphicsUnit.Pixel);
g.Dispose();
//加文字水印
//System.Drawing.Image thumbImage = newimage.GetThumbnailImage(image.Width,image.Height,null,new IntPtr());
//image.Dispose();
//thumbImage.Save(Server.MapPath(filename1), ImageFormat.Jpeg);
//加图片水印
image.Save(Server.MapPath("UploadFile/"+filename1));
Image1.Src = filename1;
Caption.Text="";
}