asp.net 2.0中的URL重写以及urlMappings问题

在asp.net2.0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();
//}
}

};
}

}

由于一旦进行了URL重写，原先的WEBFORM中的Action会发生改变，容易造成：请求的资源不存在问题

具体怎么样？各位DX看看就清楚了！！！

所有才有了这个ResponseFilter了，实现如下，

public class ResponseFilter:System.IO.Stream
{
public ResponseFilter(System.IO.Stream sink,string _str)
{
_sink = sink;
//
// TODO: 在此处添加构造函数逻辑
//
this.str = _str;
}
private string str = "";
private System.IO.Stream _sink;
private long _position;
private System.Text.Encoding end=System.Text.Encoding.GetEncoding("GB18030");
private System.Text.StringBuilder oOutput = new System.Text.StringBuilder();
// The following members of Stream must be overriden.
public override bool CanRead
{
get { return true; }
}

public override bool CanSeek
{
get { return true; }
}

public override bool CanWrite
{
get { return true; }
}

public override long Length
{
get { return 0; }
}

public override long Position
{
get { return _position; }
set { _position = value; }
}

public override long Seek(long offset, System.IO.SeekOrigin direction)
{
return _sink.Seek(offset, direction);
}

public override void SetLength(long length)
{
_sink.SetLength(length);
}

public override void Close()
{
_sink.Close();
}

public override void Flush()
{
_sink.Flush();
}

public override int Read(byte[] buffer, int offset, int count)
{
return _sink.Read(buffer, offset, count);
}

// The Write method actually does the filtering.

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