使用.Net中的HttpWebRequest类和HttpWebResponse类获取web文件

string url = "http://pic.maizuo.com/usr/100002174/0e495857e71e57b9486aecec788d557e.tmp"; WebRequest wreq = WebRequest.Create(url); WebResponse wres = wreq.GetResponse(); long len = wres.ContentLength; byte[] bytes=new byte[len]; Stream ss = wres.GetResponseStream(); string path = Server.MapPath("~/images/"); if (!Directory.Exists(path)) { Directory.CreateDirectory(path); } int idx = url.LastIndexOf("."); string suffix = url.Substring(idx);//获得上传的图片的后缀名 if (suffix.Contains("tmp")) { suffix = ".jpg"; } string pictureName = DateTime.Now.Ticks.ToString() + suffix; FileStream os = new FileStream(path + pictureName, FileMode.OpenOrCreate, Fileaccess.Write); int c = 0; while ((c = ss.Read(bytes, 0, bytes.Length)) > 0) { os.Write(bytes, 0, c); } os.Close(); ss.Close();