HttpHandler数字水印效果代码,Asp.Net代码库,德仔网

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【Asp.Net】 HttpHandler数字水印效果

作者:kunkun0921 / 发布于2015/1/26/ 465


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

	/// <summary>
	///CoverHandler 的摘要说明
	/// </summary>
	public class CoverHandler : IHttpHandler {
	public CoverHandler() {

	}

	#region IHttpHandler 成员

	//封面文件夹路径
	private const string CoverSADDR = "~/BookCovers/";
	//数字水印路径
	private const string WATERMARK_URL = "~/images/WaterMark.jpg";
	//默认图片的路径
	private const string DEFAULTIMAGE_URL = "~/images/default.jpg";

	public bool IsReusable {
	 get { throw new NotImplementedException(); }
	}

	public void ProcessRequest(HttpContext context) {

	
	 Image Cover;

	 //判断物理路径的文件是否存在
	 if (File.Exists(context.Request.PhysicalPath)) {
	 //加载文件
	 Cover = Image.FromFile(context.Request.PhysicalPath);
	 //加载水印图片
	 Image watermark = Image.FromFile(context.Request.MapPath(WATERMARK_URL));
	 //实例化画布
	 Graphics g = Graphics.FromImage(Cover);
	 //在image上绘制水印
	 g.DrawImage(watermark, new Rectangle(Cover.Width - watermark.Width, Cover.Height - watermark.Height, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel);
	 //释放画布
	 g.Dispose();
	 //释放水印图片
	 watermark.Dispose();
	 }
	 else {
	 //使用默认图片
	 Cover = Image.FromFile(context.Request.MapPath(DEFAULTIMAGE_URL));
	 }

	 //设置输出类型图片为jpeg格式
	 context.Response.ContentType = "image/jpeg";
	 //将修改的图片存入输出流中
	 Cover.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
	 Cover.Dispose();
	 context.Response.End();
	}

	#endregion
	}

试试其它关键字

　HttpHandler　　水印　

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