ASP. NET MVC page static function implementation of two: using recursive algorithm to achieve

The previous article mentions the use of IHttpModule to achieve when a user visits a Web site, by redefining the Response.filter to implement the HTML code that is returned to the client, so that the next time the user accesses a static page directly.

ASP. NET MVC page static feature implementation one: Use IHttpModule, abandon Resultfilter

Later thought can obtain the HTML code through the WebRequest, then uses the recursive algorithm to implement. The basic implementation ideas are as follows:

Get the HTML code returned by WebRequest to the hyperlink address, and save it; match all hyperlinks in HTML code href= "" Inside address information through regular expressions, and then recursively WebRequest get HTML code by passing the hyperlink address

The implementation code is as follows:

 Public classhtmlpagehelper{PrivateArrayList htmlcreatedlist =NewArrayList (); /// <summary>    ///recursive implementation of page static function/// </summary>    /// <param name= "urlstring" >the page link address to access</param>     Public voidSavehtmlcode (stringurlstring) {            if(Htmlcreatedlist.contains (urlstring)) {return; }            stringHtmlcode =Gethtmlcodefromurl (urlstring); stringHtmlpath =Gethtmlpathfromurl (urlstring); stringDirechtmlpath =Path.getdirectoryname (Htmlpath); if(!directory.exists (Direchtmlpath))            {directory.createdirectory (Direchtmlpath);            } file.writealltext (Htmlpath, Htmlcode);            Htmlcreatedlist.add (urlstring); ArrayList urllist=Geturllinkfromhtmlcode (Htmlcode); stringUrltemp =string.            Empty; foreach(stringUrlinchurllist) {Urltemp=URL; Urltemp= Regex.Replace (Urltemp,"href\\s*=\\s*",""); Urltemp= Urltemp.replace ("\"",""); Urltemp= Urltemp.replace ("\\","/"); Urltemp= Webconfiginfo.urlprefix +urltemp;            Savehtmlcode (urltemp); }        }    /// <summary>    ///HTML code linked through the HttpWebRequest page/// </summary>    /// <param name= "urlstring" >page link Address</param>    /// <returns>HTML code for page links</returns>    Private stringGethtmlcodefromurl (stringurlstring) {HttpWebRequest Hwrequest=(HttpWebRequest) webrequest.create (urlstring); Hwrequest.useragent="user-agent:mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2;. NET CLR 1.0.3705"; Hwrequest.accept="*/*"; Hwrequest.keepalive=true; HWREQUEST.HEADERS.ADD ("Accept-language","zh-cn,en-us;q=0.5"); HttpWebResponse Hwresponse=(HttpWebResponse) hwrequest.getresponse (); Stream Streamresponse=Hwresponse.getresponsestream (); StreamReader Readerofstream=NewStreamReader (Streamresponse, System.Text.Encoding.GetEncoding ("Utf-8")); stringstrHTML =Readerofstream.readtoend ();            Readerofstream.close ();            Streamresponse.close ();            Hwresponse.close (); returnstrhtml; }    /// <summary>    ///analyze the page link address to generate a static page save physical path/// </summary>    /// <param name= "urlstring" >page link Address</param>    /// <returns>physical path for static page saving</returns>    Private stringGethtmlpathfromurl (stringurlstring) {URI Uri=NewUri (urlstring); stringFilePath = HttpContext.Current.Request.PhysicalApplicationPath +"Html"+ URI. Absolutepath +"\\"; string[] Querys = URI. Query.split (New Char[] {'?','&','='}, Stringsplitoptions.removeemptyentries); foreach(stringQueryinchQuerys) {FilePath+=query; } FilePath+ = Querys. Length.equals (0) ?"index.html":". html"; FilePath= Filepath.replace ("/","\\"); FilePath= Filepath.replace ("\\\\","\\"); returnFilePath; }    /// <summary>    ///Regular Expressions match hyperlinks in HTML code/// </summary>    /// <param name= "Htmlcode" >to find the HTML code for the hyperlink</param>    /// <returns></returns>    PrivateArrayList Geturllinkfromhtmlcode (stringHtmlcode) {ArrayList alist=NewArrayList (); stringStrregex ="href\\s*=\\s* (?: [\ "] (? <1>[^\" '. #:]*) [\ "])"; Regex R=NewRegex (Strregex, regexoptions.ignorecase); MatchCollection m=r.matches (Htmlcode);  for(inti =0; I <= M.count-1; i++)            {                stringStrnew = M[i]. ToString (). Replace ("amp;",""); if(!alist.contains (strnew))                {Alist.add (strnew); }            }            returnalist; }}

ASP. NET MVC page static function implementation of two: using recursive algorithm to achieve