Url rewrite详细分析
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在写这篇随笔之前，其实网上早已有高手分析了.text的urlrewrite的实现（点击 查看全文），问题是作为一个初学者的我，看了以后，感觉没有切中要害。所以，产生了写这篇dd的冲动。 从头说起，.text是通过httpModules和httpHandlers来实现urlrewrite的，看看web.config中的配置
1 
< httpHandlers > 2 <!-- Can not see to load asmx like .aspx, since we will grap all requests later, make sure these are processed by their default factory --> 3 < add verb ="*" path ="*.asmx" type ="System.Web.Services.Protocols.WebServiceHandlerFactory, System.Web.Services, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" 4 validate ="false" /> 5 <!-- Since we are grabbing all requests after this, make sure Error.aspx does not rely on .Text --> 6 < add verb ="*" path ="Error.aspx" type ="System.Web.UI.PageHandlerFactory" /> 7 <!-- This will process any ext mapped to aspnet_isapi.dll --> 8 < add verb ="*" path ="*" type ="Dottext.Common.UrlManager.UrlReWriteHandlerFactory,Dottext.Common" /> 9 </ httpHandlers > 10 < httpModules > 11 < add name ="UrlReWriteModule" type ="Dottext.Common.UrlManager.UrlReWriteModule, Dottext.Common" /> 12 < add name ="EventHttpModule" type ="Dottext.Framework.ScheduledEvents.EventHttpModule, Dottext.Framework" /> 13 <!-- <add name="MsftBlogsHttpModule" type= "AspNetWeb.MsftBlogsHttpModule, MsftBlogsHttpModule" /> --> 14 </ httpModules > 15
看看第11行，配置了 Dottext.Common.UrlManager.UrlReWriteModule这个httpModule，很显然，从名字来看，它就是实现urlrewrite功能的httpmodule，去看看它的源代码 < httpHandlers > 2 <!-- Can not see to load asmx like .aspx, since we will grap all requests later, make sure these are processed by their default factory --> 3 < add verb ="*" path ="*.asmx" type ="System.Web.Services.Protocols.WebServiceHandlerFactory, System.Web.Services, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" 4 validate ="false" /> 5 <!-- Since we are grabbing all requests after this, make sure Error.aspx does not rely on .Text --> 6 < add verb ="*" path ="Error.aspx" type ="System.Web.UI.PageHandlerFactory" /> 7 <!-- This will process any ext mapped to aspnet_isapi.dll --> 8 < add verb ="*" path ="*" type ="Dottext.Common.UrlManager.UrlReWriteHandlerFactory,Dottext.Common" /> 9 </ httpHandlers > 10 < httpModules > 11 < add name ="UrlReWriteModule" type ="Dottext.Common.UrlManager.UrlReWriteModule, Dottext.Common" /> 12 < add name ="EventHttpModule" type ="Dottext.Framework.ScheduledEvents.EventHttpModule, Dottext.Framework" /> 13 <!-- <add name="MsftBlogsHttpModule" type= "AspNetWeb.MsftBlogsHttpModule, MsftBlogsHttpModule" /> --> 14 </ httpModules > 15 1 static UrlReWriteModule() 2 
{ 3 
regexPath = new Regex(@"^/?(\w|-|_)+\.aspx$",RegexOptions.IgnoreCase|RegexOptions.Compiled); 4 regexApplication = new Regex(HttpContext.Current.Request.ApplicationPath,RegexOptions.IgnoreCase|RegexOptions.Compiled); 5 
} 6 7 private void context_BeginRequest( object sender, EventArgs e) 8 { 9 if(ConfigProvider.Instance().IsAggregateSite) 10 
{ 11 HttpContext context = ((HttpApplication)sender).Context; 12 13 string path = context.Request.Path.ToLower(); 14 int iExtraStuff = path.IndexOf(".aspx"); 15 if(iExtraStuff > -1 || path.IndexOf(".") == -1) 16 { 17 if(iExtraStuff > -1) 18 { 19 path = path.Remove(iExtraStuff+5,path.Length - (iExtraStuff+5)); 20 
} 21 22 path = regexApplication.Replace(path, string.Empty,1,0); 23 24 if(path == "" || path == "/" || regexPath.IsMatch(path)) 25 { 26 UrlHelper.SetEnableUrlReWriting(context, false); 27 } 28 29 } 30 else if(context.Request.Path.ToLower().IndexOf("services") > 0 && context.Request.Path.ToLower().IndexOf(".asmx") > 0 ) 31 { 32 if(AlllowService(context)) 33 { 34 if(context.Request.RequestType!="POST") 35 { 36 string regexstr=@"/\w+/services/"; 37 string url=Regex.Replace(context.Request.RawUrl,regexstr,"/services/",RegexOptions.IgnoreCase); 38 context.RewritePath(url); 39 } 40 // string fileName =context.Request; // System.IO.Path.GetFileName(context.Request.Path); 41 // context.RewritePath("~/Services/" + fileName); 42 } 43 else 44 { 45 context.Response.Clear(); 46 context.Response.End(); 47 } 48 } 49 50 } 51 } 52
代码有点长，不过没关系，结构还是很清晰的。用户发出的url请求，在context_BeginRequest中进行了第一次过滤，这个函数把url做了一下归整，判断来自用户的请求是 应用程序根目录下的.aspx文件，如果是则不进行urlrewrite（由UrlHelper.SetEnableUrlReWriting这个函数进行设置）。什么？看不懂regexPath = new Regex(@"^/?(\w|-|_)＋\.aspx$",……); 这句话？建议你去看一下正则表达式，这里的意思是指，需要匹配的字符串所对应的文件是否在根目录下，举例来说， /contact.aspx default.aspx 匹配，而 /oop80/default.aspx 则不匹配， 总而言之，context_BeginRequest函数把对根目录下.aspx文件的请求，以及webservice，设置成不需要进行urlrewrite，其余的，则需要进行下一步的处理，在什么地方处理呢，我们来看看web.config中的配置，第8行，很清晰的告诉我们，在 Dottext.Common.UrlManager.UrlReWriteHandlerFactory中，会对用户的请求做进一步分析和处理。 来看看源代码 static UrlReWriteModule() 2 { 3 regexPath = new Regex(@"^/?(\w|-|_)+\.aspx$",RegexOptions.IgnoreCase|RegexOptions.Compiled); 4 regexApplication = new Regex(HttpContext.Current.Request.ApplicationPath,RegexOptions.IgnoreCase|RegexOptions.Compiled); 5 } 6 7 private void context_BeginRequest( object sender, EventArgs e) 8 { 9 if(ConfigProvider.Instance().IsAggregateSite) 10 { 11 HttpContext context = ((HttpApplication)sender).Context; 12 13 string path = context.Request.Path.ToLower(); 14 int iExtraStuff = path.IndexOf(".aspx"); 15 if(iExtraStuff > -1 || path.IndexOf(".") == -1) 16 { 17 if(iExtraStuff > -1) 18 { 19 path = path.Remove(iExtraStuff+5,path.Length - (iExtraStuff+5)); 20 } 21 22 path = regexApplication.Replace(path, string.Empty,1,0); 23 24 if(path == "" || path == "/" || regexPath.IsMatch(path)) 25 { 26 UrlHelper.SetEnableUrlReWriting(context, false); 27 } 28 29 } 30 else if(context.Request.Path.ToLower().IndexOf("services") > 0 && context.Request.Path.ToLower().IndexOf(".asmx") > 0 ) 31 { 32 if(AlllowService(context)) 33 { 34 if(context.Request.RequestType!="POST") 35 { 36 string regexstr=@"/\w+/services/"; 37 string url=Regex.Replace(context.Request.RawUrl,regexstr,"/services/",RegexOptions.IgnoreCase); 38 context.RewritePath(url); 39 } 40 // string fileName =context.Request; // System.IO.Path.GetFileName(context.Request.Path); 41 // context.RewritePath("~/Services/" + fileName); 42 } 43 else 44 { 45 context.Response.Clear(); 46 context.Response.End(); 47 } 48 } 49 50 } 51 } 52 1 public class UrlReWriteHandlerFactory: IHttpHandlerFactory 2 { 3 public UrlReWriteHandlerFactory(){} // Nothing to do in the cnstr 4 5 protected virtual HttpHandler[] GetHttpHandlers(HttpContext context) 6 { 7 return HandlerConfiguration.Instance().HttpHandlers; 8 } 9 10 /// <summary> 11 /// Implementation of IHttpHandlerFactory. By default, it will load an array of HttpHanlder (Dottext.UrlManager.HttpHandler) from 12 /// the blog.config. This can be changed, by overrideing the GetHttpHandlers(HttpContext context) method. 13 /// </summary> 14 /// <param name="context"> Current HttpContext </param> 15 /// <param name="requestType"> Request Type (Passed along to other IHttpHandlerFactory's) </param> 16 /// <param name="url"> The current requested url. (Passed along to other IHttpHandlerFactory's) </param> 17 /// <param name="path"> The physical path of the current request. Is not gaurenteed to exist (Passed along to other IHttpHandlerFactory's) </param> 18 /// <returns> 19 /// Returns an Instance of IHttpHandler either by loading an instance of IHttpHandler or by returning an other 20 /// IHttpHandlerFactory.GetHanlder(HttpContext context, string requestType, string url, string path) method 21 /// </returns> 22 public virtual IHttpHandler GetHandler(HttpContext context, string requestType, string url, string path) 23 { 24 // Get the Handlers to process. By defualt, we grab them from the blog.config 25 // Dottext.Framework.Logger.LogManager.Log("url",context.Request.Path); 26 HttpHandler[] items = GetHttpHandlers(context); 27 // Dottext.Framework.Logger.LogManager.Log("path",Dottext.Framework.Util.Globals.RemoveAppFromPath(context.Request.Path,context.Request.ApplicationPath)); 28 // Do we have any? 29 if(items != null) 30 { 31 int count = items.Length; 32 33 for( int i = 0; i<count; i++) 34 { 35 // We should use our own cached Regex. This should limit the number of Regex's created 36 // and allows us to take advantage of RegexOptons.Compiled 37 38 if(items[i].IsMatch(Dottext.Framework.Util.Globals.RemoveAppFromPath(context.Request.Path,context.Request.ApplicationPath))) 39 { 40 // throw new Exception(); 41 switch(items[i].HandlerType) 42 { 43 case HandlerType.Page: // 默认是Page 44 45 return ProccessHandlerTypePage(items[i],context,requestType,url); 46 case HandlerType.Direct: 47 HandlerConfiguration.SetControls(context,items[i].BlogControls); 48 return (IHttpHandler)items[i].Instance(); 49 case HandlerType.Factory: 50 // Pass a long the request to a custom IHttpHandlerFactory 51 return ((IHttpHandlerFactory)items[i].Instance()).GetHandler(context,requestType,url,path); 52 default: 53 throw new Exception("Invalid HandlerType: Unknown"); 54 } 55 } 56 } 57 } 58 // If we do not find the page, just let ASP.NET take over 59 return PageHandlerFactory.GetHandler(context,requestType,url, path); 60 } 61 62 63 private IHttpHandler ProccessHandlerTypePage(HttpHandler item, HttpContext context, string requestType, string url) 64 { 65 string pagepath = item.FullPageLocation; 66 if(pagepath == null) 67 { 68 pagepath = HandlerConfiguration.Instance().FullPageLocation; 69 } 70 HandlerConfiguration.SetControls(context,item.BlogControls); 71 IHttpHandler myhandler=PageParser.GetCompiledPageInstance(url,pagepath,context); 72 return myhandler; 73 } 74 75 76 public virtual void ReleaseHandler(IHttpHandler handler) 77 { 78 79 } 80 } 81
代码很长，但是它是实现urlrewrite的关键，我们来分析分析看。 UrlReWriteHandlerFactory实现了IHttpHandlerFactory接口，而IHttpHandlerFactory最关键的地方在于GetHandler这个函数接口，所以我们从GetHandler函数入手。 首先是 HttpHandler [] items = GetHttpHandlers(context)； 通过查看GetHttpHandlers的定义，可以得知返回的其实是HandlerConfiguration中一个叫HttpHandlers的属性，它的值，是通过这么一句话来进行初始化的，return ((HandlerConfiguration)ConfigurationSettings.GetConfig("HandlerConfiguration")); 想必大家现在都明白了，HandlerConfiguration对象是通过将web.config中<HandlerConfiguration>节进行反序列化获得的，关于ConfigurationSettings.GetConfig的使用，网上已经有很多了，在这里就不重复劳动了。看看web.config中的HandlerConfiguration节 public class UrlReWriteHandlerFactory: IHttpHandlerFactory 2 { 3 public UrlReWriteHandlerFactory(){} // Nothing to do in the cnstr 4 5 protected virtual HttpHandler[] GetHttpHandlers(HttpContext context) 6 { 7 return HandlerConfiguration.Instance().HttpHandlers; 8 } 9 10 /// <summary> 11 /// Implementation of IHttpHandlerFactory. By default, it will load an array of HttpHanlder (Dottext.UrlManager.HttpHandler) from 12 /// the blog.config. This can be changed, by overrideing the GetHttpHandlers(HttpContext context) method. 13 /// </summary> 14 /// <param name="context"> Current HttpContext </param> 15 /// <param name="requestType"> Request Type (Passed along to other IHttpHandlerFactory's) </param> 16 /// <param name="url"> The current requested url. (Passed along to other IHttpHandlerFactory's) </param> 17 /// <param name="path"> The physical path of the current request. Is not gaurenteed to exist (Passed along to other IHttpHandlerFactory's) </param> 18 /// <returns> 19 /// Returns an Instance of IHttpHandler either by loading an instance of IHttpHandler or by returning an other 20 /// IHttpHandlerFactory.GetHanlder(HttpContext context, string requestType, string url, string path) method 21 /// </returns> 22 public virtual IHttpHandler GetHandler(HttpContext context, string requestType, string url, string path) 23 { 24 // Get the Handlers to process. By defualt, we grab them from the blog.config 25 // Dottext.Framework.Logger.LogManager.Log("url",context.Request.Path); 26 HttpHandler[] items = GetHttpHandlers(context); 27 // Dottext.Framework.Logger.LogManager.Log("path",Dottext.Framework.Util.Globals.RemoveAppFromPath(context.Request.Path,context.Request.ApplicationPath)); 28 // Do we have any? 29 if(items != null) 30 { 31 int count = items.Length; 32 33 for( int i = 0; i<count; i++) 34 { 35 // We should use our own cached Regex. This should limit the number of Regex's created 36 // and allows us to take advantage of RegexOptons.Compiled 37 38 if(items[i].IsMatch(Dottext.Framework.Util.Globals.RemoveAppFromPath(context.Request.Path,context.Request.ApplicationPath))) 39 { 40 // throw new Exception(); 41 switch(items[i].HandlerType) 42 { 43 case HandlerType.Page: // 默认是Page 44 45 return ProccessHandlerTypePage(items[i],context,requestType,url); 46 case HandlerType.Direct: 47 HandlerConfiguration.SetControls(context,items[i].BlogControls); 48 return (IHttpHandler)items[i].Instance(); 49 case HandlerType.Factory: 50 // Pass a long the request to a custom IHttpHandlerFactory 51 return ((IHttpHandlerFactory)items[i].Instance()).GetHandler(context,requestType,url,path); 52 default: 53 throw new Exception("Invalid HandlerType: Unknown"); 54 } 55 } 56 } 57 } 58 // If we do not find the page, just let ASP.NET take over 59 return PageHandlerFactory.GetHandler(context,requestType,url, path); 60 } 61 62 63 private IHttpHandler ProccessHandlerTypePage(HttpHandler item, HttpContext context, string requestType, string url) 64 { 65 string pagepath = item.FullPageLocation; 66 if(pagepath == null) 67 { 68 pagepath = HandlerConfiguration.Instance().FullPageLocation; 69 } 70 HandlerConfiguration.SetControls(context,item.BlogControls); 71 IHttpHandler myhandler=PageParser.GetCompiledPageInstance(url,pagepath,context); 72 return myhandler; 73 } 74 75 76 public virtual void ReleaseHandler(IHttpHandler handler) 77 { 78 79 } 80 } 81 1 < HandlerConfiguration defaultPageLocation ="default.aspx" type ="Dottext.Common.UrlManager.HandlerConfiguration, Dottext.Common" > 2 < HttpHandlers > 3 < HttpHandler pattern ="(\.config|\.asax|\.ascx|\.config|\.cs|\.vb|\.vbproj|\.asp|\.licx|\.resx|\.resources)$" type ="Dottext.Framework.UrlManager.HttpForbiddenHandler, Dottext.Framework" handlerType ="Direct" /> 4 < HttpHandler pattern ="(\.gif|\.js|\.jpg|\.zip|\.jpeg|\.jpe|\.css|\.rar|\.xml|\.xsl)$" type ="Dottext.Common.UrlManager.BlogStaticFileHandler, Dottext.Common" handlerType ="Direct" /> 5 < HttpHandler pattern ="/rss\.aspx$" type ="Dottext.Common.Syndication.RssHandler, Dottext.Common" handlerType ="Direct" /> 6 < HttpHandler pattern ="/CommentsRSS\.aspx$" type ="Dottext.Common.Syndication.RecentCommentsRSS, Dottext.Common" handlerType ="Direct" /> 7 < HttpHandler pattern = "/RecentCommentsRSS\.aspx$" type = "Dottext.Common.Syndication.RecentCommentsRSS, Dottext.Common" handlerType = "Direct" /> 8 < HttpHandler pattern ="/atom\.aspx$" type ="Dottext.Common.Syndication.AtomHandler, Dottext.Common" handlerType ="Direct" /> 9 < HttpHandler pattern ="/comments/commentRss/\d+\.aspx$" type ="Dottext.Common.Syndication.RssCommentHandler, Dottext.Common" handlerType ="Direct" /> 10 < HttpHandler pattern ="/aggbug/\d+\.aspx$" type ="Dottext.Framework.Tracking.AggBugHandler, Dottext.Framework" handlerType ="Direct" /> 11 < HttpHandler pattern ="/customcss\.aspx$" type ="Dottext.Web.UI.Handlers.BlogSecondaryCssHandler, Dottext.Web" handlerType ="Direct" /> 12 < HttpHandler pattern ="/category\/(\d|\w|\s)+\.aspx/rss$" type ="Dottext.Common.Syndication.RssCategoryHandler, Dottext.Common" handlerType ="Direct" /> 13 < HttpHandler pattern ="/favorite\/(\d|\w|\s)+\.aspx/rss$" type ="Dottext.Common.Syndication.RssLinksHandler, Dottext.Common" handlerType ="Direct" /> 14 < HttpHandler pattern ="/articles/\d+\.aspx$" controls ="viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx" /> 15 < HttpHandler pattern ="/articles/\w+\.aspx$" controls ="viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx" /> 16 < HttpHandler pattern ="/PreviewPost.aspx$" controls ="PreviewPost.ascx" /> 17 < HttpHandler pattern ="/archive/\d{4}/\d{2}/\d{2}/\d+\.(aspx|htm)$" controls ="viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx" /> 18 < HttpHandler pattern ="/archive/\d{4}/\d{2}/\d{2}/\w+\.(aspx|htm)$" controls ="viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx" /> 19 < HttpHandler pattern ="/archive/\d{4}/\d{1,2}/\d{1,2}\.aspx$" controls ="ArchiveDay.ascx" /> 20 < HttpHandler pattern ="/archive/\d{4}/\d{1,2}\.aspx$" controls ="ArchiveMonth.ascx" /> 21 < HttpHandler pattern ="/archives/\d{4}/\d{1,2}\.aspx$" controls ="ArticleArchiveMonth.ascx" /> 22 < HttpHandler pattern ="/contact\.aspx$" controls ="Contact.ascx" /> 23 < HttpHandler pattern ="/AddToFavorite\.aspx$" handlerType ="Page" pageLocation ="AddToFavorite.aspx" /> 24 < HttpHandler pattern ="/BlogSearch\.aspx$" controls ="BlogSearch.ascx" /> 25 < HttpHandler pattern ="/posts/|/story/|/archive/" type ="Dottext.Web.UI.Handlers.RedirectHandler,Dottext.Web" handlerType ="Direct" /> 26 < HttpHandler pattern ="/gallery\/\d+\.aspx$" controls ="GalleryThumbNailViewer.ascx" /> 27 < HttpHandler pattern ="/gallery\/image\/\d+\.aspx$" controls ="ViewPicture.ascx" /> 28 < HttpHandler pattern ="/(?:category|stories)/(\w|\s)+\.aspx$" controls ="CategoryEntryList.ascx" /> 29 < HttpHandler pattern ="/favorite/(\w|\s)+\.aspx$" controls ="FavoriteList.ascx" /> 30 < HttpHandler pattern ="/(?:admin)" type ="Dottext.Web.UI.Handlers.BlogExistingPageHandler, Dottext.Web" handlerType ="Factory" /> 31 <!-- <HttpHandler pattern = "^(?:\/(\w|\s|\.(?!aspx))+((\/login\.aspx)?|(\/?))?)$" type = "Dottext.Web.UI.Handlers.BlogExistingPageHandler, Dottext.Web" handlerType = "Factory" /> --> 32 <!-- <HttpHandler pattern = "^(?:/\w+\/(\w|\s|\.)+\/(?:admin|logout\.aspx|login\.aspx))" type = "Dottext.Web.UI.Handlers.BlogExistingPageHandler, Dottext.Web" handlerType = "Factory" /> --> 33 < HttpHandler pattern ="/comments\/\d+\.aspx$" type ="Dottext.Common.Syndication.CommentHandler, Dottext.Common" handlerType ="Direct" /> 34 < HttpHandler pattern ="/services\/trackbacks/\d+\.aspx$" type ="Dottext.Framework.Tracking.TrackBackHandler, Dottext.Framework" handlerType ="Direct" /> 35 < HttpHandler pattern ="/services\/pingback\.aspx$" type ="Dottext.Framework.Tracking.PingBackService, Dottext.Framework" handlerType ="Direct" /> 36 < HttpHandler pattern ="/services\/metablogapi\.aspx$" type ="Dottext.Framework.XmlRpc.MetaWeblog, Dottext.Framework" handlerType ="Direct" /> 37 < HttpHandler pattern ="/Services\/SyncHanlder\.aspx$" handlerType ="Page" pageLocation ="Sevices/DottextAPI.aspx" /> 38 <!-- 只显示文章标题列表 --> 39 <!-- <HttpHandler pattern="^((/default\.aspx)|(/)|(/index\.aspx))$" controls="CategoryPostsList.ascx" /> --> 40 <!-- 显示文章内容 --> 41 < HttpHandler pattern ="^((/default\.aspx)|(/)|(/index\.aspx))$" controls ="PagedPosts.ascx" /> 42 < HttpHandler pattern ="^(/posts\.aspx)$" controls ="PagedPosts.ascx" /> 43 <!-- <HttpHandler pattern = "/services/\w+.asmx$" type="System.Web.Services.Protocols.WebServiceHandlerFactory, System.Web.Services, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" handlerType = "Factory" /> --> 44 < HttpHandler pattern = "^(?:\/(\w|\s|\.(?!aspx))+((\/default\.aspx)?|(\/?))?)$" controls = "homepage.ascx" /> 45 <!-- <HttpHandler pattern="^(?:/\w+\/(\w|\s|\.(?!aspx))+((\/default\.aspx)?|(\/?))?)$" controls="homepage.ascx" /> --> 46 47 </ HttpHandlers > 48 </ HandlerConfiguration > 49
其实在visual studio.net中看这段代码会更加清楚一点，这里的每一个pattern其实都会建立对应的Regex ，来对用户请求的url进行匹配，下面的代码会很详细说明这一点，我们往下看。 接下来是一个循环，循环中执行这么一句话 if (items[i].IsMatch(Dottext.Framework.Util.Globals.RemoveAppFromPath(context.Request.Path,context.Request.ApplicationPath))) {...} 它把web.config中每一个httphandler来匹配用户的请求，IsMatch函数中会根据pattern建立相应的Regex，并调用Regex.IsMatch函数，如果请求匹配该pattern，则调用对应的模块来进行处理。很显然，这里是实现urlrewrite的关键之处，比如，请求的是这么一个url 那么，他就会匹配这一个handler <HttpHandler pattern="/archive/\d{4}/\d{2}/\d{2}/\d+\.(aspx|htm)$" controls="viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx" /> 那么，程序就会调用 viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx 来处理用户的请求， 又如，请求这么一个url 匹配 <HttpHandler pattern="/(?:category|stories)/(\w|\s)+\.aspx$" controls="CategoryEntryList.ascx" /> 最后程序是一个switch语句，根据handlertype的不同进行各种处理，具体就不在解释了，因为……这一段我自己也没有进行更深入一步的研究，里面还有一些细节，如SetControls的控件在什么地方载入，GetCompiledPageInstance函数的具体用法等等。不过，这些东西终归和urlrewrite没多大关系了，不在我们讨论的范围之内。 请大家多多指教，谢谢 < HandlerConfiguration defaultPageLocation ="default.aspx" type ="Dottext.Common.UrlManager.HandlerConfiguration, Dottext.Common" > 2 < HttpHandlers > 3 < HttpHandler pattern ="(\.config|\.asax|\.ascx|\.config|\.cs|\.vb|\.vbproj|\.asp|\.licx|\.resx|\.resources)$" type ="Dottext.Framework.UrlManager.HttpForbiddenHandler, Dottext.Framework" handlerType ="Direct" /> 4 < HttpHandler pattern ="(\.gif|\.js|\.jpg|\.zip|\.jpeg|\.jpe|\.css|\.rar|\.xml|\.xsl)$" type ="Dottext.Common.UrlManager.BlogStaticFileHandler, Dottext.Common" handlerType ="Direct" /> 5 < HttpHandler pattern ="/rss\.aspx$" type ="Dottext.Common.Syndication.RssHandler, Dottext.Common" handlerType ="Direct" /> 6 < HttpHandler pattern ="/CommentsRSS\.aspx$" type ="Dottext.Common.Syndication.RecentCommentsRSS, Dottext.Common" handlerType ="Direct" /> 7 < HttpHandler pattern = "/RecentCommentsRSS\.aspx$" type = "Dottext.Common.Syndication.RecentCommentsRSS, Dottext.Common" handlerType = "Direct" /> 8 < HttpHandler pattern ="/atom\.aspx$" type ="Dottext.Common.Syndication.AtomHandler, Dottext.Common" handlerType ="Direct" /> 9 < HttpHandler pattern ="/comments/commentRss/\d+\.aspx$" type ="Dottext.Common.Syndication.RssCommentHandler, Dottext.Common" handlerType ="Direct" /> 10 < HttpHandler pattern ="/aggbug/\d+\.aspx$" type ="Dottext.Framework.Tracking.AggBugHandler, Dottext.Framework" handlerType ="Direct" /> 11 < HttpHandler pattern ="/customcss\.aspx$" type ="Dottext.Web.UI.Handlers.BlogSecondaryCssHandler, Dottext.Web" handlerType ="Direct" /> 12 < HttpHandler pattern ="/category\/(\d|\w|\s)+\.aspx/rss$" type ="Dottext.Common.Syndication.RssCategoryHandler, Dottext.Common" handlerType ="Direct" /> 13 < HttpHandler pattern ="/favorite\/(\d|\w|\s)+\.aspx/rss$" type ="Dottext.Common.Syndication.RssLinksHandler, Dottext.Common" handlerType ="Direct" /> 14 < HttpHandler pattern ="/articles/\d+\.aspx$" controls ="viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx" /> 15 < HttpHandler pattern ="/articles/\w+\.aspx$" controls ="viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx" /> 16 < HttpHandler pattern ="/PreviewPost.aspx$" controls ="PreviewPost.ascx" /> 17 < HttpHandler pattern ="/archive/\d{4}/\d{2}/\d{2}/\d+\.(aspx|htm)$" controls ="viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx" /> 18 < HttpHandler pattern ="/archive/\d{4}/\d{2}/\d{2}/\w+\.(aspx|htm)$" controls ="viewpost.ascx,Comments.ascx,AnonymousPostComment.ascx,LoginPostComment.ascx" /> 19 < HttpHandler pattern ="/archive/\d{4}/\d{1,2}/\d{1,2}\.aspx$" controls ="ArchiveDay.ascx" /> 20 < HttpHandler pattern ="/archive/\d{4}/\d{1,2}\.aspx$" controls ="ArchiveMonth.ascx" /> 21 < HttpHandler pattern ="/archives/\d{4}/\d{1,2}\.aspx$" controls ="ArticleArchiveMonth.ascx" /> 22 < HttpHandler pattern ="/contact\.aspx$" controls ="Contact.ascx" /> 23 < HttpHandler pattern ="/AddToFavorite\.aspx$" handlerType ="Page" pageLocation ="AddToFavorite.aspx" /> 24 < HttpHandler pattern ="/BlogSearch\.aspx$" controls ="BlogSearch.ascx" /> 25 < HttpHandler pattern ="/posts/|/story/|/archive/" type ="Dottext.Web.UI.Handlers.RedirectHandler,Dottext.Web" handlerType ="Direct" /> 26 < HttpHandler pattern ="/gallery\/\d+\.aspx$" controls ="GalleryThumbNailViewer.ascx" /> 27 < HttpHandler pattern ="/gallery\/image\/\d+\.aspx$" controls ="ViewPicture.ascx" /> 28 < HttpHandler pattern ="/(?:category|stories)/(\w|\s)+\.aspx$" controls ="CategoryEntryList.ascx" /> 29 < HttpHandler pattern ="/favorite/(\w|\s)+\.aspx$" controls ="FavoriteList.ascx" /> 30 < HttpHandler pattern ="/(?:admin)" type ="Dottext.Web.UI.Handlers.BlogExistingPageHandler, Dottext.Web" handlerType ="Factory" /> 31 <!-- <HttpHandler pattern = "^(?:\/(\w|\s|\.(?!aspx))+((\/login\.aspx)?|(\/?))?)$" type = "Dottext.Web.UI.Handlers.BlogExistingPageHandler, Dottext.Web" handlerType = "Factory" /> --> 32 <!-- <HttpHandler pattern = "^(?:/\w+\/(\w|\s|\.)+\/(?:admin|logout\.aspx|login\.aspx))" type = "Dottext.Web.UI.Handlers.BlogExistingPageHandler, Dottext.Web" handlerType = "Factory" /> --> 33 < HttpHandler pattern ="/comments\/\d+\.aspx$" type ="Dottext.Common.Syndication.CommentHandler, Dottext.Common" handlerType ="Direct" /> 34 < HttpHandler pattern ="/services\/trackbacks/\d+\.aspx$" type ="Dottext.Framework.Tracking.TrackBackHandler, Dottext.Framework" handlerType ="Direct" /> 35 < HttpHandler pattern ="/services\/pingback\.aspx$" type ="Dottext.Framework.Tracking.PingBackService, Dottext.Framework" handlerType ="Direct" /> 36 < HttpHandler pattern ="/services\/metablogapi\.aspx$" type ="Dottext.Framework.XmlRpc.MetaWeblog, Dottext.Framework" handlerType ="Direct" /> 37 < HttpHandler pattern ="/Services\/SyncHanlder\.aspx$" handlerType ="Page" pageLocation ="Sevices/DottextAPI.aspx" /> 38 <!-- 只显示文章标题列表 --> 39 <!-- <HttpHandler pattern="^((/default\.aspx)|(/)|(/index\.aspx))$" controls="CategoryPostsList.ascx" /> --> 40 <!-- 显示文章内容 --> 41 < HttpHandler pattern ="^((/default\.aspx)|(/)|(/index\.aspx))$" controls ="PagedPosts.ascx" /> 42 < HttpHandler pattern ="^(/posts\.aspx)$" controls ="PagedPosts.ascx" /> 43 <!-- <HttpHandler pattern = "/services/\w+.asmx$" type="System.Web.Services.Protocols.WebServiceHandlerFactory, System.Web.Services, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" handlerType = "Factory" /> --> 44 < HttpHandler pattern = "^(?:\/(\w|\s|\.(?!aspx))+((\/default\.aspx)?|(\/?))?)$" controls = "homepage.ascx" /> 45 <!-- <HttpHandler pattern="^(?:/\w+\/(\w|\s|\.(?!aspx))+((\/default\.aspx)?|(\/?))?)$" controls="homepage.ascx" /> --> 46 47 </ HttpHandlers > 48 </ HandlerConfiguration > 49 欢迎加群互相学习，共同进步。QQ群：iOS: 58099570 | Android: 330987132 | Go：217696290 | Python：336880185 | 做人要厚道，转载请注明出处！http://www.cnblogs.com/sunshine-anycall/archive/2009/10/27/1590371.html
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