一个利用IIS404生成静态的思路


<%@ 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;
        }
    }}
总体思路大致如上 只需要将IIS里的404错误页执行为URL到此文件即可 优点是无须对全站进行改造 只需要改变URL为相应的静态地址即可