asp.net 1.1中url重写的问题

2008-02-22 09:31:50来源：互联网阅读 ()

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("<BR>");
context.Response.Write("转向的目的URL：" newUrl);
context.Response.Write("<BR>");
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("<BR>");
cxt.Response.Write("转向的目的URL：" newUrl);
cxt.Response.Write("<BR>");