在asp.net2.0中的urlMappings 转

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2008-03-19 09:35

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. public override void Write(byte[] buffer, int offset, int count) { string szBuffer = System.Text.UTF8Encoding.UTF8.GetString(buffer, offset, count); string ap="action=/""; int pos=-1; if ((pos=szBuffer.IndexOf(ap) )!= -1) { int epos = 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； //Regex oEndFile = new Regex("</head>", RegexOptions.IgnoreCase|RegexOptions.Compiled); //if (oEndFile.IsMatch(szBuffer)) //{ // //Append the last buffer of data // //附加上缓冲区中的最后一部分数据 // oOutput.Append(szBuffer); // //Get back the complete response for the client // //传回完整的客户端返回数据 // string szCompleteBuffer = oOutput.ToString().ToLower(); // int ipos = szCompleteBuffer.IndexOf("<title>"); // int epos = szCompleteBuffer.IndexOf("</title>",ipos+7); // string sp = 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"); // //No match, so write out original data // //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

<?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>~/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。但是一时不知道怎么写好，好像要用到什么反捕获组的概念，正在思考这个东东！！