HttpHandler生成图片

//没啥说的,直接代码

using  System;
using  System.Drawing;
using  System.Configuration;
using  System.Web;
using  System.Web.UI;
///   <summary>
///  ImageHandler 的摘要说明
///   </summary>
public   class  ImageHandler:IHttpHandler
{
     public  ImageHandler()
    {
         //
         //  TODO: 在此处添加构造函数逻辑
         //
    }

     #region  IHttpHandler 成员

     public   bool  IsReusable
    {
         get  {  return   true  ; }
    }
     private   static  Image _originalImage  =   null ;
     private   static  Image GetOriginalImage(HttpContext context)
    {
         if  (_originalImage  ==   null )
        {
            _originalImage  =  Image.FromFile(
                context.Server.MapPath( " ~/images/fanwei.jpg " )); 
        }
         return  _originalImage.Clone()  as  Image;
    }
     public   void  ProcessRequest(HttpContext context)
    {
        Image originalImage  =    GetOriginalImage(context);
        Graphics graphic  =  Graphics.FromImage(originalImage);
        Font font  =   new  Font( " 幼圆 " ,  24.0f , FontStyle.Regular);
         string  query  =  HttpUtility.UrlDecode(context.Request.QueryString[ " query " ]);
        graphic.DrawString(
            query, 
            font, 
             new  SolidBrush(Color.White), 
             20.0f , 
            originalImage.Height  -  font.Height  -   30 );

        originalImage.Save(context.Response.OutputStream,
            System.Drawing.Imaging.ImageFormat.Jpeg);

        graphic.Dispose();
        originalImage.Dispose();
    }

     #endregion
}

//web.config
<add verb="*" path="*.jpg" type="ImageHandler"/>