asp.net 2.0 中的URL重写以及urlMappings问题

时间：2021-05-28

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:

usingSystem;
usingSystem.Web;

publicclassReWriteModule:IHttpModule
{
publicReWriteModule()
{
}
publicoverridestringToString()
{
returnthis.GetType().ToString();
}


voidIHttpModule.Dispose()
{

}
privatestaticSystem.Xml.XmlDocumentruleDoc=null;
privatestaticSystem.Xml.XmlDocumentGetRuleConfig(System.Web.HttpContextapp)
{
if(ruleDoc==null)
{
ruleDoc=newSystem.Xml.XmlDocument();
ruleDoc.Load(app.Server.MapPath("~/rule.xml"));
}
returnruleDoc;
}
publicstaticstringGetUrl(System.Web.HttpContextcxt,stringpath)
{

System.Xml.XmlDocumentdoc=GetRuleConfig(cxt);
System.Xml.XmlNodeListlst=doc.GetElementsByTagName("RewriterRule");
stringpat="";
foreach(System.Xml.XmlNodendinlst)
{
System.Xml.XmlNodeListsub=nd.ChildNodes[0].ChildNodes;
foreach(System.Xml.XmlNodechkinsub)
{
pat="^"+chk.InnerText+"$";
System.Text.RegularExpressions.Regexreg=newSystem.Text.RegularExpressions.Regex(pat,System.Text.RegularExpressions.RegexOptions.Compiled|System.Text.RegularExpressions.RegexOptions.IgnoreCase);
if(reg.IsMatch(path))
{
returnreg.Replace(path,nd.ChildNodes[1].InnerText);
}
}
}
returnnull;

}
voidIHttpModule.Init(HttpApplicationcontext)
{
context.BeginRequest+=delegate(objectsender,EventArgse)
{


System.Web.HttpContextcxt=context.Context;

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

stringnewUrl=GetUrl(cxt,path.TrimEnd().TrimStart());
if(newUrl!=null)
{
cxt.Response.Filter=newResponseFilter(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，

publicclassResponseFilter:System.IO.Stream
{
publicResponseFilter(System.IO.Streamsink,string_str)
{
_sink=sink;
//
//TODO:在此处添加构造函数逻辑
//
this.str=_str;
}
privatestringstr="";
privateSystem.IO.Stream_sink;
privatelong_position;
privateSystem.Text.Encodingend=System.Text.Encoding.GetEncoding("GB18030");
privateSystem.Text.StringBuilderoOutput=newSystem.Text.StringBuilder();
//ThefollowingmembersofStreammustbeoverriden.
publicoverrideboolCanRead
{
get{returntrue;}
}

publicoverrideboolCanSeek
{
get{returntrue;}
}

publicoverrideboolCanWrite
{
get{returntrue;}
}

publicoverridelongLength
{
get{return0;}
}

publicoverridelongPosition
{
get{return_position;}
set{_position=value;}
}

publicoverridelongSeek(longoffset,System.IO.SeekOrigindirection)
{
return_sink.Seek(offset,direction);
}

publicoverridevoidSetLength(longlength)
{
_sink.SetLength(length);
}

publicoverridevoidClose()
{
_sink.Close();
}

publicoverridevoidFlush()
{
_sink.Flush();
}

publicoverrideintRead(byte[]buffer,intoffset,intcount)
{
return_sink.Read(buffer,offset,count);
}

//TheWritemethodactuallydoesthefiltering.
publicoverridevoidWrite(byte[]buffer,intoffset,intcount)
{
stringszBuffer=System.Text.UTF8Encoding.UTF8.GetString(buffer,offset,count);
stringap="action=\"";
intpos=-1;
if((pos=szBuffer.IndexOf(ap))!=-1)
{
intepos=szBuffer.IndexOf("\"",pos+ap.Length+1);
if(epos!=-1)
{
szBuffer=szBuffer.Remove(pos+ap.Length,epos-pos-ap.Length);
}

szBuffer=szBuffer.Insert(pos+ap.Length,this.str);

byte[]data=System.Text.UTF8Encoding.UTF8.GetBytes(szBuffer);
_sink.Write(data,0,data.Length);

}
else
{
oOutput.Append(szBuffer);
}

//下面的这一段可以用来修改<Head></head>之间的内容；
//RegexoEndFile=newRegex("</head>",RegexOptions.IgnoreCase|RegexOptions.Compiled);
//if(oEndFile.IsMatch(szBuffer))
//{
////Appendthelastbufferofdata
////附加上缓冲区中的最后一部分数据
//oOutput.Append(szBuffer);
////Getbackthecompleteresponsefortheclient
////传回完整的客户端返回数据
//stringszCompleteBuffer=oOutput.ToString().ToLower();
//intipos=szCompleteBuffer.IndexOf("<title>");
//intepos=szCompleteBuffer.IndexOf("</title>",ipos+7);
//stringsp=szCompleteBuffer.Substring(ipos+7,epos-ipos);
//szCompleteBuffer=szCompleteBuffer.Remove(ipos+7,sp.Length-7);
//szCompleteBuffer=szCompleteBuffer.Insert(ipos+7,"dhz");
////szCompleteBuffer=szCompleteBuffer.Replace(sp,"dhz");
////Nomatch,sowriteoutoriginaldata
////没有匹配，因此写入源代码
//byte[]data=System.Text.UTF8Encoding.UTF8.GetBytes(szCompleteBuffer);
//_sink.Write(data,0,data.Length);
//}
//else
//{
//oOutput.Append(szBuffer);
//}
}
}

//////而重候规则呢则是用xml文件配置如下；

当然在web.config通过自定义配置节做也可以的

<?xmlversion="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>~/pc</LookFor>
</LookFors>
<SendTo>~/Test2.aspx</SendTo>
</RewriterRule>
</Rules>
//这个规则写的不好，如第一个就可以用一个正则表达式来做。

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