【下载文档:  asp.net保存远程图片的代码.txt 】

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asp.net保存远程图片的代码
注意：并没有实现CSS中的图片采集，且图片的正则还有待完善。 复制代码 代码如下: using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; //引入空间 using System.Net; using System.IO; using System.Text; using System.Text.RegularExpressions; using System.Collections; ///

/// 采集 ///

public class caiji { public caiji() { // // TODO: 在此处添加构造函数逻辑 // } ///

/// 要采集的网页的连接地址 ///

/// url /// public static string caijiByUrl(string url,string chargest,string path) { string str = GetSourceTextByUrl(url,chargest); ArrayList lib = new ArrayList(); int i = 0; //根据url取得网站域名 Uri uri = new Uri(url); //Scheme或者协议，一般为http,Host为取得域名 string baseurl = uri.Scheme + "://" + uri.Host + "/"; //提取出url，包括src等信息 //\S匹配任何非空白字符 Regex g = new Regex(@"(src=(""|\')\S+\.(gif|jpg|png|bmp)(""|\'))", RegexOptions.Multiline | RegexOptions.IgnoreCase); MatchCollection m = g.Matches(str); foreach (Match math in m) { //已经提取到图片的路径了，但还需要分绝对路径，相对路径，以及后缀名是否为图片，因为可能为.asp,.aspx这些，比如验证码图片 string imgUrl = math.Groups[0].Value.ToLower();//转成小写,=号之间可能有不定的空格 //去除src与单引号，双引号 imgUrl = imgUrl.Replace("src",""); imgUrl = imgUrl.Replace("\"",""); imgUrl = imgUrl.Replace("'",""); imgUrl = imgUrl.Replace("=",""); imgUrl = imgUrl.Trim(); //路径处理 if (imgUrl.Substring(0, 4) != "http") { //需要判断是否是绝对路径还是相对路径 if (imgUrl.Substring(0, 1) == "/") { imgUrl = baseurl + imgUrl; } else { imgUrl = url.Substring(0,url.LastIndexOf("/") + 1) + imgUrl; } } //判断元素是否已经存在,-1为不存在 if (lib.IndexOf(imgUrl) == -1) { lib.Add(imgUrl); } } string str_ = string.Empty; WebClient client = new WebClient(); for (int j = 0; j < lib.Count; j++) { string savepath = path + DateTime.Now.Month + DateTime.Now.Day + DateTime.Now.Minute + DateTime.Now.Second + j + lib[j].ToString().Substring((lib[j].ToString().Length) -4,4); try { client.DownloadFile(new Uri(lib[j].ToString()), savepath); str_ += lib[j].ToString() + "
保存路径为：" + savepath + "

"; } catch (Exception e) { str_ += e.Message; } } return str_; } public static string GetSourceTextByUrl(string url,string chargest) { WebRequest request = WebRequest.Create(url); request.Timeout = 20000;//20秒超时 WebResponse response = request.GetResponse(); Stream resStream = response.GetResponseStream(); StreamReader sr = new StreamReader(resStream,Encoding.GetEncoding(chargest)); return sr.ReadToEnd(); } } 使用：比如我是保存到upload文件夹中的： 复制代码 代码如下: string path = Server.MapPath("~/upload/"); Response.Write(caiji.caijiByUrl(//www.zwyuanma.com, "utf-8", path));