关于handler的水印技术

就是在一张画板上花上另一个图像、、

<%@ WebHandler Language=“C#” Class=“Handler” %>

using System;
using System.Web;
using System.Drawing;
using System.Text;
using System.IO;
using System.Drawing.Imaging;
using System.Web.SessionState;

public class Handler : IHttpHandler {

private String defaultImageURL = “~/Image/default.jpg”;
    private String waterMarkImage = “~/Image/WaterMark.jpg”;
    private String coverImageURL = “~/Image/Covers/”;



    public void ProcessRequest (HttpContext context) {
         context.Response.ContentType = “image/jpeg”;
         context.Request.ContentEncoding=Encoding.GetEncoding(“gb2312”);
         context.Response.ContentEncoding=Encoding.GetEncoding(“gb2312”);


        String isbn = context.Request[“isbn”];
        coverImageURL = coverImageURL + isbn + “.jpg”;

        Image coverImg=null;

if (File.Exists(context.Server.MapPath(coverImageURL)))
{

coverImg = Image.FromFile(context.Server.MapPath(coverImageURL));
Image waterwarkImg = Image.FromFile(context.Server.MapPath(waterMarkImage));

Graphics g = Graphics.FromImage(coverImg);

g.DrawImage(waterwarkImg, new Rectangle(0, 0, coverImg.Width, waterwarkImg.Height), 0, 0, waterwarkImg.Width, waterwarkImg.Height, GraphicsUnit.Pixel);
waterwarkImg.Dispose();
g.Dispose();

}
        else {
            coverImg = Image.FromFile(context.Server.MapPath(defaultImageURL));
        }

coverImg.Save(context.Response.OutputStream,ImageFormat.Jpeg);
        coverImg.Dispose();
        context.Response.End();


    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}

以上是 handler 的代码、

<asp:Image ID=“Image1” runat=“server” ImageUrl="~/Handler.ashx?isbn=9221944"/>

以上是页面的代码、

关于handler的水印技术

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