ASP.NET使用UrlRewriter重写URL

ASP.NET使用UrlRewriter重写URL，实现伪静态功能。

1、 创建/xml/URLRewriterSettings.xml文件

<?xml version="1.0" encoding="utf-8" ?>
<URLRewriters>
<URLRewriters Path="/product/dtl_(.*)_(.*).html" RealPath="/product/detail.aspx?ProductId=$1&CategoryNo=$2"/>
<URLRewriters Path="/product/dtl_(.*).html" RealPath="/product/detail.aspx?ProductId=$1"/>
<URLRewriters Path="/product/index.html" RealPath="/product/index.aspx"/>
<URLRewriters Path="/product/(.*).html" RealPath="/product/index.aspx?pi=$1"/>
</URLRewriters>

注意：该[b]xml文件中参数多的节点要放在参数少的节点上面。

[/b]

2、在App_Code目录下创建UrlRewriter.cs类

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Web.SessionState;
using System.IO;
using System.Text;

/// <summary>
///UrlRewriter 的摘要说明
/// </summary>
public class UrlRewriter : IHttpHandler, IRequiresSessionState
{
public UrlRewriter()
{
//
//TODO: 在此处添加构造函数逻辑
//
}

public void ProcessRequest(HttpContext Context)
{
//取得原始URL屏蔽掉参数
string Url = Context.Request.RawUrl;
int wIndex = Url.IndexOf("?");
string strLink = Url;
string strParam = string.Empty;
if (wIndex > 0)
{
strLink = Url.Substring(0, wIndex);
strParam = Url.Substring(wIndex);
}
// 如果域名中含有大写，则直接跳转到小写地址
if (System.Text.RegularExpressions.Regex.IsMatch(strLink, "[A-Z]"))
{
Context.Response.AddHeader("Location", strLink.ToLower() + strParam);
Context.Response.BufferOutput = true;
Context.Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));
Context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
Context.Response.AppendHeader("Pragma", "No-Cache");
Context.Response.StatusCode = 301;
Context.Response.Status = "301 Moved Permanently";
Context.Response.End();
return;
}

bool IsHave = false;
System.Xml.XmlDocument Dom = new System.Xml.XmlDocument();
Dom.Load(HttpContext.Current.Server.MapPath(@"~/xml/URLRewriterSettings.xml"));
System.Xml.XmlNodeList ItemList = Dom.SelectSingleNode(@"//URLRewriters").ChildNodes;
foreach (System.Xml.XmlNode Node in ItemList)
{
String Ph = Node.Attributes.GetNamedItem(@"Path").InnerText;
String Rh = Node.Attributes.GetNamedItem(@"RealPath").InnerText;
if (Ph.StartsWith(@"~")) Ph = HttpContext.Current.Request.ApplicationPath + Ph.Substring(1);
if (Rh.StartsWith(@"~")) Rh = HttpContext.Current.Request.ApplicationPath + Rh.Substring(1);
//建立正则表达式
System.Text.RegularExpressions.Regex Reg = new System.Text.RegularExpressions.Regex(Ph, System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Match m = Reg.Match(Url);//匹配
if (m.Success)//成功
{
if (Context.Request.QueryString.Count > 0 && Context.Request.QueryString.ToString().IndexOf(".html") >= 0)
{
bool isParameter = false;

for (int z = 0; z < Context.Request.QueryString.Count; z++)
{
if (Context.Request.QueryString[z] == m.Value)
{
isParameter = true;
break;
}
}
if (isParameter)
{
continue;
}
}

IsHave = true;

for (int i = 1; i <= m.Groups.Count; i++)
{
string sValue = m.Groups[i].Value;
int index = Rh.IndexOf("$" + i.ToString());   //找到要替换参数的位置
int len = ("$" + i.ToString()).Length;
if (index >= 0)
{
string strBefore = Rh.Substring(0, index);  //要替换的字符串前面的字符串部分
string strChange = Rh.Substring(index, len).Replace("$" + i.ToString(), sValue);  //替换要替换的字符串
string strAfter = Rh.Substring(index + len);    //要替换的字符串前面的字符串后面部分
Rh = strBefore + strChange + strAfter;
}
}

if (!string.IsNullOrEmpty(Context.Request.Url.Query))
{
if (Rh.IndexOf("?") > 0)
Rh = Rh + "&" + Context.Request.QueryString;
else
Rh = Rh + "?" + Context.Request.QueryString;
}

Context.Server.Execute(Rh);
Context.Response.End();
break;
}
}

try
{
if (IsHave)
{
Context.Server.Execute(Context.Request.Url.PathAndQuery);
}
else
{
string mpath = Context.Request.PhysicalPath;
if (File.Exists(mpath))
{
StreamReader sr = new StreamReader(mpath, System.Text.Encoding.Default);
string str = sr.ReadToEnd();
sr.Close();
sr.Dispose();
Context.Response.Write(str);
Context.Response.End();
}
else
{
Context.Server.Execute("/error.aspx");
Context.Response.End();
}
}
}
catch
{
//Context.Response.Write("404 ERROR！");
//Context.Response.End();
}
}

/// <summary>
/// 实现“IHttpHandler”接口所必须的成员
/// </summary>
/// <value></value>
public bool IsReusable
{
get { return false; }
}
}

3、在web.config添加配置信息

<httpHandlers>
<add verb="*" path="?*.html" type="UrlRewriter"/>
</httpHandlers>

测试：

（1）创建/product/index.aspx和/product/detail.aspx。

（2）浏览器中输入：

/product/1.html 则实际URL为：/product/index.aspx?pi=1

/product/dtl_12.html 则实际URL为：/product/detail.aspx?ProductId=12

/product/dtl_12_1001003.html 则实际URL为：/product/detail.aspx?ProductId=12&CategoryNo=1001003