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1.修改web.congif

<system.web>
		<httpHandlers>
			<remove verb="*" path="*.asmx"/>
			<!--解决图片防盗链问题-->
			<add verb="*" path="*.jpg" type="MyHttpHandler.Watermark"/>
			<add verb="*" path="*.gif" type="MyHttpHandler.Watermark"/>
			<add verb="*" path="*.png" type="MyHttpHandler.Watermark"/>
		</httpHandlers>
</system.web>

2.添加一个一般执行文件Watermark.ashx,代码如下:

using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;


namespace MyHttpHandler
{
    /// <summary>
    /// Summary description for $codebehindclassname$
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class Watermark : IHttpHandler
    {

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

        public void ProcessRequest(HttpContext context)
        {
            //设置客户端缓冲时间过期时间为0,即立即过期
            //context.Response.Expires = 0;
            //清空服务器端为此会话开启的输出缓存
            //context.Response.Clear();
            //设置输出文件类型
            context.Response.ContentType = "image/jpg";
            //将请求文件写入到输出缓存中
            #region 获取XML配置信息
            DataSet dsConfing = new DataSet();
            string watermarkConfigPath = context.Server.MapPath("~/Config/WaterMarkConfig.xml");
            if (System.IO.File.Exists(watermarkConfigPath))
                dsConfing.ReadXml(watermarkConfigPath);
            else
            {
                //添加默认的水印配置
            }
            DataRow drConfing = dsConfing.Tables[0].Rows[0];

            #endregion
            string currentHost = drConfing["allowhost"].ToString();
            //判断是否是本地网站引用图片,如果是则返回正确的图片
            if (context.Request.Url.Authority.Equals(currentHost, StringComparison.InvariantCultureIgnoreCase))
            {
                string localPath = context.Request.Url.LocalPath;
                localPath = localPath.Remove(localPath.LastIndexOf('/')).ToLower();// "/images/userphoto"
                if (drConfing["isflag"].Equals("true") && drConfing["files"].ToString().ToLower().IndexOf(localPath) > 0)
                {
                    #region 水印代码
                    string sImgStartPhysicalPath = context.Request.PhysicalPath;
                    System.Drawing.Image imgStart = System.Drawing.Image.FromFile(sImgStartPhysicalPath);
                    //备份原图片
                    //int indexOf = sImgStartPhysicalPath.LastIndexOf(".");
                    //string bakPath = sImgStartPhysicalPath.Remove(indexOf) + "_bak" + sImgStartPhysicalPath.Substring(indexOf);
                    //imgStart.Save(bakPath);

                    Graphics gh = System.Drawing.Graphics.FromImage(imgStart);
                    if (drConfing["type"].Equals("img"))
                    {
                        System.Drawing.Image imgWatermark = System.Drawing.Image.FromFile(context.Server.MapPath(drConfing["img-path"].ToString()));

                        Rectangle rg = SetImgPosition(drConfing["position"].ToString(), imgStart.Width, imgStart.Height, imgWatermark.Width, imgWatermark.Height);
                        gh.DrawImage(imgWatermark, rg, 0, 0, imgWatermark.Width, imgWatermark.Height, GraphicsUnit.Pixel);



                        gh.Save();
                        gh.Dispose();
                        imgWatermark.Dispose();

                    }
                    else if (drConfing["type"].Equals("font"))
                    {
                        //文字水印
                        string content = drConfing["font-content"].ToString();
                        float Size = (float)Convert.ToDouble(drConfing["font-size"].ToString());

                        FontStyle fontStyle = (FontStyle)int.Parse(drConfing["font-style"].ToString());
                        System.Drawing.Font f = new System.Drawing.Font("Arial", Size, fontStyle);
                        Color G_Color = Color.FromName(drConfing["font-color"].ToString());
                        System.Drawing.Brush b = new System.Drawing.SolidBrush(G_Color);
                        SizeF sizeF = gh.MeasureString(content, f);
                        gh.DrawString(content, f, b, SetFontPosition(drConfing["position"].ToString(), imgStart.Width, imgStart.Height, (int)sizeF.Width, (int)sizeF.Height));

                        gh.Save();
                        gh.Dispose();
                    }
                    //将请求文件写入到输出缓存中
                    imgStart.Save(context.Response.OutputStream, ImageFormat.Jpeg);
                    imgStart.Dispose();
                    #endregion
                }
                else
                {
                    #region 输出原图
                    //将请求文件写入到输出缓存中
                    context.Response.WriteFile(context.Request.Url.AbsolutePath);
                    #endregion
                }
            }
            //如果不是本地引用,则是盗链本站图片
            else
            {
                //将请求文件写入到输出缓存中
                context.Response.WriteFile(context.Request.PhysicalApplicationPath + drConfing["errimgpath"].ToString());     
            }
            //将输出缓存中的信息传送到客户端
            context.Response.End();
        }


        /// <summary>
        /// 图片绘画水印的位置
        /// </summary>
        /// <param name="positionConfig">位置类型</param>
        /// <param name="width">原图片宽</param>
        /// <param name="height"></param>
        /// <param name="watermarkWidth">水印图宽</param>
        /// <param name="watermarkHeight"></param>
        /// <returns></returns>
        private Rectangle SetImgPosition(string positionConfig,int width,int height,int watermarkWidth,int watermarkHeight)
        {

            int xpos = 0;
            int ypos = 0;
            int margin = 10;
            int width_margin = width - margin;
            int height_margin = height - margin;
            double proportion = 1d;//水印图片缩放比例
            //int 
            if ((width_margin > watermarkWidth * proportion) && (height_margin > watermarkHeight * proportion))
            {
            }
            else if ((width_margin > watermarkWidth * proportion) && (height_margin < watermarkHeight * proportion))
            {

                proportion = Convert.ToDouble( height_margin) /  Convert.ToDouble( watermarkHeight);

            }
            else if ((width_margin < watermarkWidth * proportion) && (height_margin > watermarkHeight * proportion))
            {
                proportion = Convert.ToDouble(width_margin) / Convert.ToDouble(watermarkWidth);
            }
            else
            {
                double proportionW = Convert.ToDouble(width_margin) / Convert.ToDouble(watermarkWidth);
                double proportionH = Convert.ToDouble(height_margin) / Convert.ToDouble(watermarkHeight);                
                proportion = proportionW >= proportionH ? proportionH : proportionW;
            }

            watermarkWidth = Convert.ToInt32(watermarkWidth * proportion);
            watermarkHeight = Convert.ToInt32(watermarkHeight * proportion);


            switch (positionConfig)
            {
                case "top-left":
                    xpos = margin;
                    ypos = margin;
                    break;
                case "top-right":
                    xpos = width_margin - watermarkWidth;
                    ypos = margin;
                    break;
                case "bottom-left":
                     xpos = margin;
                     ypos = height_margin - watermarkHeight;
                    break;
                case "bottom-right":
                    xpos = width_margin - watermarkWidth ;
                    ypos = height_margin - watermarkHeight ;
                    break;
                default:
                    xpos = width_margin - watermarkWidth ;
                    ypos = height_margin - watermarkHeight;
                    break;
            }
            return new Rectangle(xpos,ypos,watermarkWidth,watermarkHeight);
        }
        /// <summary>
        /// 图片绘画文字位置
        /// </summary>
        /// <param name="positionConfig">位置类型</param>
        /// <param name="width">原图片宽</param>
        /// <param name="height"></param>
        /// <param name="fontWidth">文字长度</param>
        /// <param name="fontHeight"></param>
        /// <returns></returns>
        private Point SetFontPosition(string positionConfig, int width, int height, int fontWidth, int fontHeight)
        {

            int xpos = 0;
            int ypos = 0;
            int margin = 10;
            int width_margin = width - margin;
            int height_margin = height - margin;
            double proportion = 1d;//水印图片缩放比例
            //int 
            if ((width_margin > fontWidth * proportion) && (height_margin > fontHeight * proportion))
            {
            }
            else if ((width_margin > fontWidth * proportion) && (height_margin < fontHeight * proportion))
            {

                proportion = Convert.ToDouble(height_margin) / Convert.ToDouble(fontHeight);

            }
            else if ((width_margin < fontWidth * proportion) && (height_margin > fontHeight * proportion))
            {
                proportion = Convert.ToDouble(width_margin) / Convert.ToDouble(fontWidth);
            }
            else
            {
                double proportionH = Convert.ToDouble(height_margin) / Convert.ToDouble(fontHeight);
                double proportionW = Convert.ToDouble(width_margin) / Convert.ToDouble(fontWidth);
                proportion = proportionW >= proportionH ? proportionH : proportionW;
            }

            fontWidth = Convert.ToInt32(fontWidth * proportion);
            fontHeight = Convert.ToInt32(fontHeight * proportion);

            switch (positionConfig)
            {
                case "top-left":
                    xpos = margin;
                    ypos = margin;
                    break;
                case "top-right":
                    xpos = width_margin - fontWidth;
                    ypos = margin;
                    break;
                case "bottom-left":
                    xpos = margin;
                    ypos = height_margin - fontHeight;
                    break;
                case "bottom-right":
                    xpos = width_margin - fontWidth;
                    ypos = height_margin - fontHeight;
                    break;
                default:
                    xpos = width_margin - fontWidth;
                    ypos = height_margin - fontHeight;
                    break;
            }
            return new Point(xpos, ypos);
        }
        
    }
}

3.配置文件的WaterMarkConfig.xml,内容如下:

<?xml version="1.0" encoding="utf-8" ?>
<watermark>
    <allowhost>localhost:6219</allowhost><!--允许访问的域名-->
    <isflag>true</isflag><!-- true、false-->
    <type>font</type><!-- img、font-->
    <files>/config|/upfiles/ab</files><!--需要加水印的文件夹-->
    <position>bottom-right</position><!-- top-left、top-right、bottom-left、bottom-right-->    
    <img-path>~/UpFiles/Watermark.png</img-path><!-- 水印位置 -->
    <font-style>1</font-style><!--普通文本 0, 加粗文本 1, 倾斜文本 2, 带下划线的文本 4, 中间有直线通过的文本 8-->
    <font-size>60</font-size>
    <font-color>red</font-color>
    <font-content>¥:8000元</font-content>    
    <errimgpath>images/error.jpg</errimgpath><!-- 盗图片的请求返回的跟目录下的某图片 -->
</watermark>

posted on 2011-04-13 10:41  bignjl  阅读(1498)  评论(0编辑  收藏  举报