自定义实现URL重写 04.18

1、定义XML规则，配置好URL节点

?xml version="1.0" encoding="utf-8" ?>
<urls>
  <rewrite name="ShowNews" pattern="news-(\d+).html" 
           page="news.aspx" query="id=$1">
    
  </rewrite>
</urls>

2、对XML的解析，对其进行封装

  public class MyUrlRewrite
    {
        public string Name { get; set; }
        public string Pattern { get; set; }
        public string Page { get; set; }
        public string Query { get; set; }
    }

    public class UrlList
    {
        private static UrlList instance;
        public List<MyUrlRewrite> GetAllUrls
        {
            get;
            set;
        }
         
        private UrlList()
        {
            GetAllUrls = new List<MyUrlRewrite>();
            XmlDocument xmlDoc = new XmlDocument();
            string xmlPath = HttpContext.Current.Request.PhysicalApplicationPath + "/UrlLink.config";
            xmlDoc.Load(xmlPath);
            XmlNode node = xmlDoc.SelectSingleNode("urls");
            foreach (XmlNode item in node.ChildNodes)
            {
                XmlAttribute name = item.Attributes["name"];
                XmlAttribute pattern = item.Attributes["pattern"]; 
                XmlAttribute page = item.Attributes["page"];
                XmlAttribute query = item.Attributes["query"];
                if (name == null || pattern == null ||  query == null || pattern == null)
                    continue;
                MyUrlRewrite model = new MyUrlRewrite();
                model.Name = name.Value;
                model.Pattern = pattern.Value;
                model.Page = page.Value;
                model.Query = query.Value;
                GetAllUrls.Add(model);
            }
        }
        public static UrlList GetUrlList()
        {
            if (instance == null)
            {
                instance = new UrlList();
            }
            return instance;
        }
    }

3、自定义IHttpModule接口实现URL重写【关于此接口的介绍不做多讲，网上有很多】

 /**
     * 向实现类提供模块初始化和事件处理
     * 
     */ 
    public class MyHttpModule : System.Web.IHttpModule
    {
        #region IHttpModule 成员

        //处置由实现 IHttpModule 的模块使用的资源（内存除外）。
        public void Dispose()
        {
            throw new NotImplementedException();
        }
        //初始化模块，并使其为处理请求做好准备。
        public void Init(HttpApplication context)
        {

            context.BeginRequest += new EventHandler(context_BeginRequest);
        }

        void context_BeginRequest(object sender, EventArgs e)
        {
            HttpContext context = ((HttpApplication)sender).Context;
            string requestPath = context.Request.Path.ToLower();
            foreach (MyUrlRewrite item in UrlList.GetUrlList().GetAllUrls)
            {
                //不区分大小写 
                if (Regex.IsMatch(requestPath, item.Pattern, RegexOptions.IgnoreCase))
                {
                    string newUrl = Regex.Replace(requestPath, item.Pattern, item.Query);
                    if (newUrl.Length == 0)
                        context.RewritePath(item.Page);
                    else

                        context.RewritePath(item.Page + "?" + newUrl.Substring(1));
                }
            }
        }

        #endregion
    }

4、在web.config进行相应的配置

<httpModules> 
   <add name="urlrewrite" type="_017_URL重写.MyHttpModule,017_URL重写"/>
</httpModules>

5、最终的效果图

 

小结：

    1、了解asp.net的管道和生命周期很重要

    2、将程序可配置化，避免总是修改demo，采用xml定义规则

    3、最重要的是：湖人进入季后赛了，但科比受伤了。