public class Watermark : IHttpHandler

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

namespace MyHttpHandler
{
    /// <summary>
    /// Summary description for Watermark
    /// </summary>
    public class Watermark : IHttpHandler
    {

        //public void ProcessRequest(HttpContext context)
        //{
        //    context.Response.ContentType = "text/plain";
        //    context.Response.Write("Hello World");
        //}
        public void ProcessRequest(HttpContext context)
        {
            HttpRequest req = context.Request;
            if (req.UrlReferrer != null && req.UrlReferrer.Host.Length > 0) //反盗链代码判断
            {
                System.Drawing.Image img = System.Drawing.Image.FromFile(context.Request.PhysicalPath);
                System.Drawing.Graphics g = Graphics.FromImage(img);
                //g.DrawString("三国演义", new Font("宋体", 20, FontStyle.Bold), Brushes.White, 10, 10);
                g.DrawString(req.UrlReferrer.Host, new Font("宋体", 20, FontStyle.Bold), Brushes.White, 10, 10);
                img.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
                context.Response.Flush();
                context.Response.End();
            }
            else
            {
                if (req.UrlReferrer != null)
                {
                    context.Response.Write(req.UrlReferrer.Host);
                }
                else
                {
                    context.Response.Write("您不能盗链本站图片");
                }

            }
        }

        public bool IsReusable
        {
            get
            {
                return true;
            }
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>

<configuration>
<configSections>
    
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
    <add name="DefaultConnection" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=aspnet-MyHttpHandler-20160923172205;Integrated Security=SSPI" providerName="System.Data.SqlClient" />
</connectionStrings>
<appSettings>
    <add key="webpages:Version" value="2.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="PreserveLoginUrl" value="true" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.web>
    <httpHandlers>
      
      <add verb="*" path="*.jpg" type="MyHttpHandler.Watermark"/>
      <add verb="*" path="*.gif" type="MyHttpHandler.Watermark"/>
      <add verb="*" path="*.png" type="MyHttpHandler.Watermark"/>
    </httpHandlers>

    <compilation debug="true" targetFramework="4.0" />
    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login" timeout="2880" />
    </authentication>
    <pages>
      <namespaces>
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Optimization" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.WebPages" />
      </namespaces>
    </pages>
</system.web>
<system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true" />
    <handlers>
      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
      <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
</system.webServer>
<runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
</runtime>
<entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
</entityFramework>
</configuration>

@{
    ViewBag.Title = "Home Page";
}
@section featured {
    <section class="featured">
        <div class="content-wrapper">
            <hgroup class="title">
                <h1>@ViewBag.Title.</h1>
                <h2>@ViewBag.Message</h2>
            </hgroup>
            <p>
                To learn more about ASP.NET MVC visit
                <a href="http://asp.net/mvc" title="ASP.NET MVC Website">http://asp.net/mvc</a>.
                The page features <mark>videos, tutorials, and samples</mark> to help you get the most from ASP.NET MVC.
                If you have any questions about ASP.NET MVC visit
                <a href="http://forums.asp.net/1146.aspx/1?MVC" title="ASP.NET MVC Forum">our forums</a>.
            </p>
        </div>
    </section>
}
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<img src="Images/lena.jpg" border="0" />
<a href="Images/lena.jpg" >lena.jpg</a>

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