第一步，在App_Code中新建一個類，類名為BookCoverHandler，然后代碼如下

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Drawing;

using System.Drawing.Imaging;

using System.IO;

/// <summary>

///BookCoverHandler 的摘要說明

/// </summary>

public class BookCoverHandler:IHttpHandler

{

????public void ProcessRequest(HttpContext context)

????{

????????//獲取請求的圖片信息

????????//string isbn = context.Request.QueryString["isbn"];

????????//找圖片

????????//string path = context.Server.MapPath("~/Images/BookCovers/" + isbn + ".jpg");

????????string path = context.Request.PhysicalPath;

????????string defaultPath = context.Server.MapPath("~/images/default.jpg");

????????string waterPath = context.Server.MapPath("~/images/watermark.jpg");

????????//處理圖片

????????Image cover;

????????//圖片存在加水印

????????if (File.Exists(path))

????????{

????????????Image water = Image.FromFile(waterPath);

????????????cover = Image.FromFile(path);

????????????Graphics g = Graphics.FromImage(cover);

????????????g.DrawImage(water,

????????????????cover.Width - water.Width,

????????????????cover.Height - water.Height,

????????????????water.Width,

????????????????water.Height);

????????????g.Dispose();

????????}

????????else//圖片不存在加載默認圖片?

????????{

????????????cover = Image.FromFile(defaultPath);

????????}

????????context.Response.ContentType = "image/jpeg";

????????cover.Save(context.Response.OutputStream, ImageFormat.Jpeg);

????????cover.Dispose();

????????context.Response.End();

????}

????public bool IsReusable

????{

????????get

????????{

????????????return true;

????????}

????}

}

第二部，在web.config中

????<httpHandlers>

??????<!--圖片水印-->

??????<add verb="*" type="BookCoverHandler" path="Images/BookCovers/*.jpg" />

????</httpHandlers>

然后就會為Images/BookCovers/下的jpg圖片自動添加水印

轉載于:https://www.cnblogs.com/zhanghai/p/4461255.html

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