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asp.net 中的URL重写以及urlMappings问题

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☆蘫弧ゞ无悔

电梯直达

1^#

发表于 2009-3-16 17:13:33 | 只看该作者回帖奖励

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在asp.net2中的urlMappings倒是非常好用，可惜暂不支持正则表达式，不过，好在如果用IHttpModule的话
  不管什么样的请求都会先经过IHttpModule这样就为URL重写提供了一个好机会：

  下面是我写的一个IHttpModule:

  using System;
  using System.Web;

  public class ReWriteModule:IHttpModule
  {
public ReWriteModule()
{
}
public override string ToString()
{
return this.GetType().ToString();
}
  void IHttpModule.Dispose()
  {
  }
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;

}
  void IHttpModule.Init(HttpApplication context)
  {
context.BeginRequest += delegate(object sender, EventArgs e)
{
System.Web.HttpContext cxt = context.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("<BR>");
cxt.Response.Write("转向的目的URL：" + newUrl);

cxt.Response.Write("<BR>");
cxt.RewritePath(newUrl);

}//如果要求处理所有的请求时用到
//else
//{
// cxt.Response.Write(cxt.Request.Path + "<BR>");
// cxt.Response.Write("你请求的资源不存在或无权访问！");
// cxt.Response.Flush();
// cxt.Response.End();
//}
}
   };
  }

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