C#应用正则表达式将相当路径转化为绝对路径

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Net; using System.Text.RegularExpressions; public partial class Default7 : System.Web.UI.Page { // C#应用正则表达式将相当路径转化为绝对路径 //（来源：http://code.nontalk.com/2007/04/convert-relative-paths-to-absolute.html） public static String ConvertRelativePathsToAbsolute(String text, String absoluteUrl) { String value = Regex.Replace(text,"<(.*?)(src|href)=\"(?!http)(.*?)\"(.*?)>","<$1$2=\"" + absoluteUrl + "$3\"$4>", RegexOptions.IgnoreCase | RegexOptions.Multiline); // Now just make sure that there isn't a // because if // the original relative path started with a / then the // replacement above would create a //. return value.Replace(absoluteUrl + "/", absoluteUrl); } protected void Page_Load(object sender, EventArgs e) { //简单例子 string url = "http://blog.csdn.net/gdjlc/"; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Timeout = 20000; using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) { using (System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8)) { if (response.StatusCode == HttpStatusCode.OK && response.ContentLength < 1024 * 1024) { string html = reader.ReadToEnd(); html = ConvertRelativePathsToAbsolute(html, "http://blog.csdn.net/"); Response.Write(html); } } } } }