给图片加水印-优快云博客

本文介绍了一个名为ConvertImage的类，该类实现IHttpHandler接口，用于处理HTTP请求，并将一张图片叠加到另一张图片上。主要功能包括从指定路径加载图片、进行图片叠加处理并返回处理后的JPEG格式图片。

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编写一个ConvertImage.cs类

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Drawing;

/// <summary>
/// ConvertImage 的摘要说明
/// </summary>
public class ConvertImage:IHttpHandler
{
    public ConvertImage()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

#region IHttpHandler 成员

    public bool IsReusable
    {
        get { return false ; }
    }

    public void ProcessRequest(HttpContext context)
    {
        System.Drawing.Image img = null;
        if (File.Exists(context.Request.PhysicalPath))
        {
            string path = context.Request.PhysicalPath;

img = System.Drawing.Image.FromFile(path);

System.Drawing.Image backImg = System.Drawing.Image.FromFile(context.Server.MapPath("~/Images/1.jpg"));

Graphics g = Graphics.FromImage(img);

g.DrawImage(backImg, new Rectangle(img.Width - backImg.Width, img.Height - backImg.Height, backImg.Width, backImg.Height), 0, 0, backImg.Width, backImg.Height, System.Drawing.GraphicsUnit.Pixel);

g.Dispose();

backImg.Dispose();

        }
        else
        {
            img = System.Drawing.Image.FromFile(context.Request.MapPath("~/Images/default.jpg"));
        }

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

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

img.Dispose();

context.Response.End();

}

#endregion
}