一个利用IIS404生成静态的思路

bingo_ 2010-09-19 10:54:06



<%@ WebHandler Language="C#" Class="_404_Install" %>



using System;

using System.Web;

using System.Net;

using System.IO;

using System.Text;

using System.Text.RegularExpressions;

using System.Collections.Generic;



public class _404_Install : IHttpHandler {

    public struct URL

    {

        public string VisURL;

        public string ToURL;

    }

    public void ProcessRequest (HttpContext context) {

        // 映射关系

        List<URL> WURL = new List<URL>();

        WURL.Add(new URL{ VisURL = "/news/[a-z]+([0-9]+)[a-z]+([0-9]*).html" , ToURL="/news.aspx?id=$1&type=$2"});

        WURL.Add(new URL{ VisURL = "/class/b([0-9]+)/([0-9]+)/*", ToURL="/class.aspx?id=$1&page=$2"});

        WURL.Add(new URL{ VisURL = "/index.html", ToURL="/default.aspx"});

        context.Response.ContentType = "text/html";

        // 用户访问的URL http://www.baidu.com/123/123.htm

        string Url = context.Request.Url.ToString().Split(';')[1];

        // 获得域名 http://www.baidu.com

        string Domain = "http://" + context.Request.Url.Host;

        // 获得完整目录 /123/123.htm

        // 可能是 /123/123 或 /123/123/ 此时需要加index.html

        string FullPath = Url.ToLower().Replace("http://", "");

        int Tmp = FullPath.IndexOf("/");

        if (Tmp > -1)

            FullPath = FullPath.Substring(Tmp, FullPath.Length - Tmp);

        else

            FullPath = "";

        // 处理 /123/123/ -> /123/123

        if (FullPath[FullPath.Length - 1] == '/')

            FullPath = FullPath.Substring(0, FullPath.Length - 1);

        // 判断是否是目录 目录则添加默认页

        string[] AP = FullPath.Split('/');

        if (AP[AP.Length-1].IndexOf('.') == -1)

            FullPath = FullPath + "/index.html";



        for (int i = 0; i < WURL.Count; i++)

        {

            if (Regex.IsMatch(FullPath, WURL[i].VisURL))

            {

                string DURL = Regex.Replace(Url, WURL[i].VisURL, WURL[i].ToURL);

                if (SavePageAsFile(DURL, FullPath))

                    context.Response.Redirect(FullPath);

                else

                    context.Response.Write("该页不存在!");

                context.Response.End();

            }

        }

        context.Response.Write("该页不存在!");

    }



    public bool SavePageAsFile(string url, string Path)

    {

       try

       {

            string result = "";

            WebRequest wr = WebRequest.Create(url);

            WebResponse wp = wr.GetResponse();

            using (StreamReader sr = new StreamReader(wp.GetResponseStream(), Encoding.GetEncoding("gb2312")))

                result = sr.ReadToEnd();

            wp.Close();

            // 为防止生成不存在的信息 可以在这一步对内容进行筛选

            // 创建目录

            string Dir = Path.Substring(0, Path.LastIndexOf('/'));

            Dir = HttpContext.Current.Server.MapPath(Dir);

            if (!Directory.Exists(Dir))

                Directory.CreateDirectory(Dir);

            // 创建文件

            using (StreamWriter sw = new StreamWriter( HttpContext.Current.Server.MapPath(Path) , true, Encoding.GetEncoding("gb2312")))

                sw.Write(result);

            return true;

        }

        catch (Exception e)

        {

            //HttpContext.Current.Response.Write(e.Message);

            return false;

        }

    }

    

    public bool IsReusable {

        get {

            return false;

        }

    }



}