Asp.Net 一般处理程序
一般处理程序
创建一般处理程序步骤
【案例】使用一般处理程序实现添加图片水印
引入命名空间:
1.局部添加水印
string imgs = "~/ProductImgs/";
string fin = context.Request.MapPath(imgs + context.Request.QueryString["id"] + ".jpg");
Image imge = null;
if (File.Exists(fin))
{
imge = Image.FromFile(fin);
Graphics gra = Graphics.FromImage(imge);
gra.DrawString("zw_980512",new Font("黑体",20),Brushes.Black,imge.Width-95,imge.Height-20);
}
else{}
context.Response.ContentType = "image/jpeg";
imge.Save(context.Response.OutputStream, ImageFormat.Jpeg);
imge.Dispose();
context.Response.End();
2.全局添加水印
string fin = context.Request.PhysicalPath;
Image imge = null;
if (File.Exists(fin))
{
imge = Image.FromFile(fin);
Graphics gra = Graphics.FromImage(imge);
gra.DrawString("zw_980512",new Font("黑体",20),Brushes.Black,imge.Width-95,imge.Height-20);
}
else{}
context.Response.ContentType = "image/jpeg";
imge.Save(context.Response.OutputStream, ImageFormat.Jpeg);
imge.Dispose();
context.Response.End();
前台
<img class="style1" src="ProductImgs/1.jpg" />
Web.config后台代码
<httpHandlers>
<add verb="*" path="ProductImgs/*.jpg" validate="false" type="WebApplication1.Handler1"/>
</httpHandlers>