MyBookShop/BookShop/Handler/WaterImage.ashx.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Web;

namespace BookShop.Handler
{
    /// <summary>
    /// WaterImage 的摘要说明
    /// </summary>
    public class WaterImage : IHttpHandler
    {
        
        public WaterImage(){}
        public void ProcessRequest(HttpContext context)
        {
            string path = context.Request.PhysicalPath;
            if (File.Exists(path))
            {
                Image img = Image.FromFile(path);
                if (img == null)
                {
                    string physicalPath = context.Request.MapPath(@"~/img/Images/BookCovers");
                    string defaultImagePath = Path.Combine(physicalPath, "noPicture.jpg");
                    img = Image.FromFile(defaultImagePath);
                }
                else
                {
                   Graphics g = Graphics.FromImage(img);
                   g.DrawString("YC87出品", new Font("楷体",20),Brushes.Red,img.Width-40,img.Height-30);
                }
                Image waterImg = Image.FromFile(context.Request.MapPath(@"~/img/Images/BookCovers"));
                context.Response.ContentType = "image/jpg";
                img.Save(context.Response.OutputStream,ImageFormat.Jpeg);
                img.Dispose();
            }

            context.Response.End();

        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}