asp.net 1.1中url重写的问题_ASP.NET技巧

1：asp.net1.1中重写中可删节的问题！！！

如以下的正则表达式：

<Rules>
<RewriterRule>
 <LookFors>
 <LookFor>~/(\d{4})/(\d{2})\.html</LookFor>---------<1>
 <LookFor>~/(\d{4})/(\d{2})/</LookFor>--------------<2>
 <LookFor>~/(\d{4})/(\d{2})</LookFor>-----------<3>
 <LookFor>~/(\d{4})/(\d{2})/index.html</LookFor>----<4>
 </LookFors>
 <SendTo>~/Pro.aspx?year=$1&month=$2</SendTo>
</RewriterRule>
</Rules>

其中的1,4可以正常映射到对应的页面

可2,3则会出现http404错误！！！

其原因在于IIS本身的处理流程，解决办法则是在网站自己重写404处理错误！！！

1：自定义处理404错误的URL（在IIS中配置,在web.config中的配置对重写无用）

2:在System.Web节中添加如下节:

源代码如下：

public class Http404:System.Web.IHttpHandler
{
public Http404()
{
   //
   // TODO: 在此处添加构造函数逻辑
   //
}
#region IHttpHandler 成员

public void ProcessRequest(System.Web.HttpContext context)
{
   // TODO: 添加 Http404.ProcessRequest 实现
   string errorPath=context.Request.RawUrl.Split(new char[]{';'})[1];
   string appPath=context.Request.ApplicationPath;
   int ipos=errorPath.IndexOf(appPath);

   string url=errorPath.Substring(ipos+appPath.Length );
//   if(!url.EndsWith("/"))
//   {
//      url+="/";
//   }
//   url+="index.html";
//   context.Response.Write(url);
//   context.RewritePath(url);

//context.Response.Write(url);
 url="~"+url;
 string newUrl =lt.ReWriteModule.GetUrl(context,url);
 //context.Response.Write(newUrl);
 if (newUrl != null)
 {
 //cxt.Response.Filter = new ResponseFilter(cxt.Response.Filter,cxt.Request.Path);
 context.Response.Write("请求的路径:" + url);
 context.Response.Write(" ");
 context.Response.Write("转向的目的URL：" + newUrl);
 context.Response.Write(" ");
 context.RewritePath(newUrl);
 }
 else
 {
 context.Response.Write("你请求的资源不存在！！");
 context.Response.End ();
 }
}

public bool IsReusable
{
   get
   {
    // TODO: 添加 Http404.IsReusable getter 实现
    return false;
   }
}

///////////////配置节处理中的httpModule如下:

public class ReWriteModule:System.Web.IHttpModule
{
public ReWriteModule()
{
   //
   // TODO: 在此处添加构造函数逻辑
   //
}
#region IHttpModule 成员

public void Init(System.Web.HttpApplication context)
{
   // TODO: 添加 ReWriteModule.Init 实现
   context.BeginRequest+=new EventHandler(this.ReWrite);
}
private static System.Xml.XmlDocument ruleDoc = null;
private static System.Xml.XmlDocument GetRuleConfig(System.Web.HttpContext app)
{
   if (ruleDoc == null)
   {
    ruleDoc = new System.Xml.XmlDocument();
    ruleDoc.Load(app.Server.MapPath("~/rule.xml"));
   }
   return ruleDoc;
}
public static string GetUrl(System.Web.HttpContext cxt,string path)
{

   System.Xml.XmlDocument doc = GetRuleConfig(cxt);
   System.Xml.XmlNodeList lst= doc.GetElementsByTagName("RewriterRule");
   string pat="";
   foreach (System.Xml.XmlNode nd in lst)
   {
    System.Xml.XmlNodeList sub = nd.ChildNodes[0].ChildNodes;
    foreach(System.Xml.XmlNode chk in sub)
    {
     pat = "^" + chk.InnerText+"$";
     System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(pat, System.Text.RegularExpressions.RegexOptions.Compiled | System.Text.RegularExpressions.RegexOptions.IgnoreCase);
     if(reg.IsMatch(path))
     {
      return reg.Replace(path, nd.ChildNodes[1].InnerText);
     }
    }
   }
   return null;

}
private void ReWrite(object sender,EventArgs e)
{
 System.Web.HttpContext cxt =(sender as System.Web.HttpApplication).Context;

 if (cxt.Request.ContentType != "image/pjpeg")
 {
 string type = cxt.Request.ContentType.ToLower();
 string path = cxt.Request.Path;
 string apppath = cxt.Request.ApplicationPath;
 path = path.Remove(0, apppath.Length);
 path = "~" + path;

 string newUrl = GetUrl(cxt, path.TrimEnd().TrimStart());
 if (newUrl != null)
 {
 //cxt.Response.Filter = new ResponseFilter(cxt.Response.Filter,cxt.Request.Path);
 cxt.Response.Write("请求的路径:" + path);
 cxt.Response.Write(" ");
 cxt.Response.Write("转向的目的URL：" + newUrl);
 cxt.Response.Write(" ");
 cxt.RewritePath(newUrl);



 }
 //else
 //{
 // cxt.Response.Write(cxt.Request.Path + " ");
 // cxt.Response.Write("你请求的资源不存在或无权访问！");
 // cxt.Response.Flush();
 // cxt.Response.End();
 //}
 }
}
public void Dispose()
{
 // TODO: 添加 ReWriteModule.Dispose 实现
}

#endregion
}

---------rule.xml的配置如下:

<?xml version="1.0" encoding="utf-8" ?>
<Rules>
<RewriterRule>
 <LookFors>
 <LookFor>~/(\d{4})/(\d{2})\.html</LookFor>
 <LookFor>~/(\d{4})/(\d{2})/</LookFor>
 <LookFor>~/(\d{4})/(\d{2})</LookFor>
 <LookFor>~/(\d{4})/(\d{2})/index.html</LookFor>
 </LookFors>
 <SendTo>~/Pro.aspx?year=$1&month=$2</SendTo>
</RewriterRule>
<RewriterRule>
 <LookFors>
 <LookFor>~/Pro.aspx?year=(\d{4})&month=(\d{2})</LookFor>
 </LookFors>
 <SendTo>~/(\d{4})/(\d{2})\.html</SendTo>
</RewriterRule>
<RewriterRule>
 <LookFors>
 <LookFor>~/pc</LookFor>
 </LookFors>
 <SendTo>~/Test2.aspx</SendTo>
</RewriterRule>
<RewriterRule>
 <LookFors>
 <LookFor>~/index.html</LookFor>
 <LookFor>~/default.html</LookFor>
 </LookFors>
 <SendTo>~/default.aspx</SendTo>
</RewriterRule>
</Rules>

/////////对于因重写引起的action的改变，请参考本人写的asp.net2.0中的urlMappings的问题！！！！！