asp.net网站首页根据IP自动跳转指定页面的示例

对于大中型网站，为了增强用户体验，往往需要根据不同城市站点的用户推送或展现相应个性化的内容，如对于一些大型门户网站的新闻会有城市站点的功能，如果没有设置相应的城市站点，默认就是根据用户访问的IP地址的所在城市自动设置。本文主要通过自定义扩展IHttpModule接口，考虑到性能IP数据库主要采用QQwry纯真IP数据库，主要实现根据IP地址或地址段或IP所在城市进行自动跳转到指定页面的功能(支持Nginx作为前端反向代理服务器），该WebsiteSkip组件核心代码如下：

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Xml;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;
using NetOpen_System.Component.QQWry;namespace NetOpen_System.Component
{
 public sealed class WebsiteSkipHttpModule : IHttpModule
 {
 #region IHttpModule 成员 public void Dispose()
 {
 } public void Init(HttpApplication context)
 {
 context.BeginRequest += new EventHandler(context_BeginRequest);
 }
 #endregion
 void context_BeginRequest(object sender, EventArgs e)
 {
 try
 { //if (HttpContext.Current.Request.IsLocal)//忽略本地计算机请求
 // return; //string ip = HttpContext.Current.Request.UserHostAddress;
 //string ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
 string ip = string.Empty;
 if (HttpContext.Current.Request.ServerVariables["HTTP_X_REAL_IP"] != null)
 {
 ip = HttpContext.Current.Request.ServerVariables["HTTP_X_REAL_IP"].ToString();
 }
 else if (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
 {
 ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
 }
 else if (HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)
 {
 ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
 }
 else
 {
 ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
 }
 QQWryLocator qqWry = new QQWryLocator(HttpContext.Current.Server.MapPath(@"~\IpData\qqwry.dat")); IPLocation ipaddress = qqWry.Query(ip); //查询一个IP地址 string ls_city = ipaddress.Country;
 string ls_urlfrom = string.Empty;
 string ls_urlto = string.Empty;
 string ls_url = HttpContext.Current.Request.Url.AbsoluteUri;
 string ls_useragentkeyword = string.Empty; ExcludeUserAgentMatchEngine Em = WebsiteSkipConfiguration.GetConfig().ExcludeUserAgents; if(Em.ExcludeUserAgentList.Count > 0)
 {
 foreach (ExcludeUserAgent ua in Em.ExcludeUserAgentList)
 {
 if (HttpContext.Current.Request.UserAgent.Contains(ua.keyword))
 {
 return;
 }
 }
 } UrlMatchEngine pu = WebsiteSkipConfiguration.GetConfig().SkipedUrls; if (pu.UrlList.Count > 0)
 {
 foreach (SkipedUrl sk in pu.UrlList)
 { if (ls_city.Contains(sk.IpCity))
 {
 if (sk.UrlFrom.Length > 0)
 {
 if (sk.UrlFrom.Contains(ls_url) && !ls_url.Contains(sk.OutKeyWord))
 {
 if (sk.UrlTo.Length > 0)
 {
 HttpContext.Current.Response.Redirect(sk.UrlTo, true);
 }
 break;
 } } break;
 }
 }
 } if (WebsiteSkipConfiguration.GetConfig().IpChecks.GetIpIn(ip))
 {
 ls_urlfrom = WebsiteSkipConfiguration.GetConfig().IpChecks.UrlFrom.Trim();
 ls_urlto = WebsiteSkipConfiguration.GetConfig().IpChecks.UrlTo.Trim();
 if (ls_urlfrom.Length > 0)
 { if (ls_urlfrom.Contains(ls_url) && !ls_url.Contains(WebsiteSkipConfiguration.GetConfig().IpChecks.OutKeyWord))
 {
 if (ls_urlto.Length > 0)
 {
 HttpContext.Current.Response.Redirect(ls_urlto, true);
 } } 
 }
 } 
 }
 catch
 { }
 }
 }
}

在部署方面，非常简单主要利用IHttpModule接口并在Web.config中的HttpModule节点添加此组件的配置，访问限制或允许参数可以在NetOpen_SystemWebsiteSkip.cfg.xml进行设置，以下为一个简单的配置示例：

<?xml version="1.0" encoding="utf-8" ?>
<NetOpen_System>
 <WebsiteSkip>
 <SkipedUrl>
 <add ipcity="温州" urlfrom="http://examplesite.com/Default.aspx,http://examplesite.com/,http://examplesite.cn/,http://www.examplesite.cn" urlto="http://wz.mainwebsite.pcom/index.aspx" outkeyword="math"/>
 <add ipcity="镇江" urlfrom="http://examplesite.com/Default.aspx,http://examplesite.com/,http://examplesite.cn/,http://www.examplesite.cn" urlto="http://jszj.mainwebsite.com/index.aspx" outkeyword="math"/>
 </SkipedUrl>
 <SkipedIP>
 <add ip1="220.186.0.0" ip2="220.186.255.255" urlfrom="http://examplesite.com/Default.aspx,http://examplesite.com/,http://examplesite.cn/,http://www.examplesite.cn" urlto="http://wz.mainwebsite.com/index.aspx" outkeyword="math"/>
 </SkipedIP>
 <ExcludeUserAgent>
 <add keyword="Baiduspider">
 <add keyword="Sosospider">
 <add keyword="Sogou web spider">
 <add keyword="Sogou inst spider">
 <add keyword="Sogou-Test-Spider">
 <add keyword="Sogou Orion spider">
 <add keyword="Gigabot">
 <add keyword="0JJJSpider">
 <add keyword="Sogou Pic Spider">
 <add keyword="Googlebot">
 <add keyword="Yeti/1.0">
 </ExcludeUserAgent>
 </WebsiteSkip>
 </WebsiteSkip>
</NetOpen_System>

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