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//第一种方法，Global文件重写

       protected void Application_Start(object sender, EventArgs e)
       {
           File.AppendAllText(Server.MapPath("global.txt"),DateTime.Now.ToString()+" AppStart\r\n");
       }

       protected void Session_Start(object sender, EventArgs e)
       {
           File.AppendAllText(Server.MapPath("global.txt"), DateTime.Now.ToString()+" ip:"+Request.UserHostAddress+ " SessionStart \r\n");
       }

       protected void Application_BeginRequest(object sender, EventArgs e)
       {
           //每次打开网页都会发生
           //File.AppendAllText(Server.MapPath("global.txt"), DateTime.Now.ToString() + " ip:" + Request.UserHostAddress + "request\r\n");
           ////可以用来屏蔽指定ip
           //if (HttpContext.Current.Request.UserHostAddress == "127.0.0.1")
           //{
           //   HttpContext.Current.Response.Write("已被屏蔽");
           //   HttpContext.Current.Response.End();
           //}
           //防止图片盗链
           if (HttpContext.Current.Request.Url.AbsolutePath.EndsWith(".jpg") && HttpContext.Current.Request.UrlReferrer.Host != "localhost")
           {
               //Context.Response.Write(HttpContext.Current.Request.UrlReferrer.Host);
               HttpContext.Current.Response.WriteFile( HttpContext.Current.Server.MapPath("~/dl.jpg"));
               HttpContext.Current.Response.End();
           }
           //符合格式时，内部重写，地址栏不显示此地址
           Regex reg = new Regex(@".+MyStatic-(\d+).aspx");
           var match = reg.Match(HttpContext.Current.Request.Url.AbsolutePath);
           if(match.Success)
           {
               string page=match.Groups[1].Value;
               //仿静态页面
               HttpContext.Current.RewritePath("~/MyStatic.aspx?page="+page);
           }
           
       }

       protected void Application_AuthenticateRequest(object sender, EventArgs e)
       {

       }

       protected void Application_Error(object sender, EventArgs e)
       {
           //获取未处理的异常信息
           Exception t = HttpContext.Current.Server.GetLastError();
           File.AppendAllText(Server.MapPath("global.txt"), DateTime.Now.ToString() +t.Message+"服务器错误\r\n");
       }

       protected void Session_End(object sender, EventArgs e)
       {
           File.AppendAllText(Server.MapPath("global.txt"), DateTime.Now.ToString() + " ip:" + Request.UserHostAddress + " SessionEnd \r\n");
       }

       protected void Application_End(object sender, EventArgs e)
       {
           File.AppendAllText(Server.MapPath("global.txt"), DateTime.Now.ToString() + " AppEnd\r\n");
       }

 //第二种方法，建立类库（处理程序）重写url-处理任何请求

//类库handle里的类Myhandle

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
namespace handle
{
   /// <summary>
   /// 处理请求,添加引用System.Web
   /// </summary>
   class Myhandle:IHttpModule
   {
       public void Init(HttpApplication context)
       {
           context.BeginRequest += MyRequest;
       }
       public void Dispose()
       {
           
       }
       protected void MyRequest(object sender, EventArgs e)
       {

System.Web.HttpApplication app = (System.Web.HttpApplication)sender;
            HttpContext context = app.Context;
            HttpResponse response = context.Response;

            string path = app.Context.Request.Path;

            // app.Context.Response.Write(path);
            string fname = System.IO.Path.GetFileName(path);
            if (fname.Contains(".html"))
            {
                string pathWithOutFilename = path.Replace(fname, "");
                System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex("([A-Za-z1-9]{1,})\\-(\\d+).html");
                System.Text.RegularExpressions.Match match = reg.Match(fname);

                if (match.Success)
                {
                    //for (int i = 0; i < match.Groups.Count; i++)
                    //    app.Context.Response.Write(match.Groups[i].Value+"<br/>");
                    path = "~" + pathWithOutFilename + match.Groups[1].Value + ".aspx?id=" + match.Groups[2].Value;

                    ///http://localhost:6685/Read-14562.html
                    ///转换成实际的 http://localhost:6685/Read.aspx?id=14562
                    context.RewritePath(path);
                }
                else
                {
                    path = path.Replace(".do", ".aspx");
                    path = path.Replace(".html", ".aspx");
                    context.RewritePath("~" + path);
                }
            }

   }

     ///网站项目中添加对该类库的引用
     ///Web.config文件中加入注册处理程序
     //<httpModules>
     // <add name="MyModule" type="handle.Myhandle,handle"/> ///加入这一句，handle为类库项目名，Myhandle为类名
     // <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
     //</httpModules>
}