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java 版和C# 版 UrlRewriter 的实现方法
java 版UrlRewriter 的实现
web.xml 
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <filter>
        <filter-name>urlRewriter</filter-name>
        <filter-class>dang.web.UrlRewriter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>urlRewriter</filter-name>
        <url-pattern>*.jhtml</url-pattern>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
</web-app>
UrlRewriter.java
package dang.web;

import java.io.IOException;
import java.io.InputStream;
import java.util.regex.Pattern;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document; 
import org.w3c.dom.Element;
import org.w3c.dom.NodeList; 
import org.w3c.dom.Node;


public class UrlRewriter implements Filter
{
    private static List<UrlPattern> urlpattern_list = null;
    
    public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException
    {
        if(urlpattern_list==null)
            getPatternListFromResource();
        
        String path = getFullRequestInfo((HttpServletRequest)request);
        for(UrlPattern up : urlpattern_list)
        {
            if(up.isMatch(path))
                 request.getRequestDispatcher(up.replace(path)).forward(request, response);
        }
    }
    
    private static void getPatternListFromResource()
    {
        Document xdoc = null;
        
        try
        {
            InputStream stream = UrlRewriter.class.getResourceAsStream("/w.xml");
            xdoc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(stream);
        } 
        catch (Exception e)
        {

        }
        
        if(xdoc==null)
            return;
        
        NodeList list = xdoc.getDocumentElement().getChildNodes();
        urlpattern_list = new ArrayList<UrlPattern>();
        
        int i,len=list.getLength();
        
        for(i=0;i<len;i++)
        {
            Node n = list.item(i);
            if(n.getNodeType()==Node.ELEMENT_NODE)
            {
                Element e = (Element)n;
                UrlPattern up = new UrlPattern(e.getAttribute("find"), e.getAttribute("to"));
                urlpattern_list.add(up);
            }
        }
    }
    
    private static String getFullRequestInfo(HttpServletRequest request)
    {
         String url = request.getRequestURI();
         String para = request.getQueryString();
         return para==null?url:url.concat("?").concat(para);
    }
    
    public void destroy(){}

    public void init(FilterConfig filterConfig){}
}

 
class UrlPattern
{
    //<editor-fold defaultstate="collapsed" desc="UrlPattern class">
    private Pattern p;
    private String to;
    
    public UrlPattern(String find,String to)
    {
        this.p=Pattern.compile(find);
        this.to = to;
    }
    
    public String replace(String path)
    {
        return p.matcher(path).replaceAll(to);
    }
    
    public boolean isMatch(String path)
    {
        return p.matcher(path).matches();
    }
     //</editor-fold>
}
C#版UrlRewriter 的实现
web.config
 <?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="urlRewriter" type="System.Configuration.IgnoreSectionHandler"/>
  </configSections>
  <urlRewriter>
    <add find="^/(\d+).aspx$" to="/product.aspx?page_index=$1&amp;page_size=5"/>
  </urlRewriter>
    <system.web>
        <httpModules>
          <add name="urlRewriter" type="Dang.Web.HttpModule.UrlRewriter,Dang.Web"/>
        </httpModules>
    </system.web>
</configuration>

UrlRewriter.cs
  using System;
using System.Web;
using System.Xml;
using System.Text;
using System.Collections;
using System.Text.RegularExpressions;
using System.Configuration;

namespace BBS.Core
{
    public class UrlRewriter : IHttpModule
    {
        private static UrlRegex[] regArray = null;

        static UrlRewriter()
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(string.Concat(AppDomain.CurrentDomain.BaseDirectory,"web.config"));
            XmlNodeList nodeList = xmlDoc.SelectNodes("/configuration/urlRewriter/add");

            int j = nodeList.Count;
            regArray = new UrlRegex[j];

            for (int i = 0; i < j; i++)
                regArray[i] = new UrlRegex(nodeList[i].Attributes["find"].Value, nodeList[i].Attributes["to"].Value);
        }

        public void Dispose()
        {
        }

        public void Init(HttpApplication context)
        {
            context.BeginRequest += new System.EventHandler(context_BeginRequest);
        }

        void context_BeginRequest(object sender, System.EventArgs e)
        {
            HttpContext context = ((HttpApplication)sender).Context;
            string url = context.Request.RawUrl;
            foreach (UrlRegex reg in regArray)
                if (reg.IsMatch(url))
                    context.RewritePath(reg.Replace(url));
        }
    }


    public class UrlRegex
    {
        private Regex reg = null;
        private string find = null;
        private string to = null;

        public UrlRegex(string find, string to)
        {
            this.reg = new Regex(find, RegexOptions.IgnoreCase);
            this.find = find;
            this.to = to;
        }

        public string Replace(string input)
        {
            return this.reg.Replace(input, this.to);
        }

        public bool IsMatch(string input)
        {
            return this.reg.IsMatch(input);
        }
    }
}
 
楼主 创建：08-06-02 11:20:00 更新：08-06-02 11:20:00
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大狗熊

上面 的 java 版的 UrlRewriter 也可以用Servlet 实现 代码类似

    <servlet>
        <servlet-name>urlRewriter</servlet-name>
        <servlet-class>dang.web.UrlRewriter</servlet-class>
    </servlet>   
    <servlet-mapping>
        <servlet-name>urlRewriter</servlet-name>
        <url-pattern>*.jhtml</url-pattern>
    </servlet-mapping>
1楼 创建：08-06-02 15:22:19 更新：08-06-02 15:22:19
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