.net使用httpHandler添加图片防盗链

.net使用httpHandler添加图片防盗链
1. 配置web.config:

  <!--图片添加水印的配置-->
                <httpHandlers>
                        <add verb="*" path="*.jpg" type="LinkHandler" />
                </httpHandlers>
  <!--图片添加水印的配置结束-->

2. OutLinkHandler.cs:

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

/// <summary>
///HttpHandler 实现防盗链效果
/// </summary>
public class LinkHandler:IHttpHandler
{
    public LinkHandler() { }
            //1. 设置不能允许重用
            public bool IsReusable
            {
                get { return false; }
            }
            //2. 编写最终处理程序
            public void ProcessRequest(HttpContext context)
            {
                //context.Request.UrlReferrer.Host   //主机名
                //context.Request.Url.Port  //端口号
 <wbr>  <wbr>  <wbr>  <wbr>  <wbr>  <wbr>  <wbr>  <wbr> //context.Request.UrlReferrer.Authority   <wbr>//服务器端IP

                //根据Ip地址和端口号判断
                if (context.Request.UrlReferrer.Authority == "192.168.123.184" &&
                context.Request.UrlReferrer.Port == context.Request.Url.Port)
                    {
                            context.Response.ContentType="image/jpeg";
                            context.Response.WriteFile(context.Request.PhysicalPath);
                    }
                else
                    {
                    context.Response.ContentType="image/jpeg";
                    context.Response.WriteFile(context.Request.PhysicalApplicationPath+"images/1/LinkError.jpg");
                    }
            }
}