我现在正在做一个网站 我里面包含一个查询图书的系统 但是现在我没有图书馆的数据库 我想借用别人的网页 在查询的时候让服务器在别的网页上查询 然后通过智能表达式 提取我做药查的内容 在返给客户端 想请教一下高手 这方面的知识我上那里去学 请高手给支个招 看看 怎么可以实现我的要求 谢了
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我想你应该去学两点
1.正则表达式(很复杂)
2.WebRequest（很简单）
不过感觉你似乎还有更多基础的东西也要去学。
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抓取页面
- C# code
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net;using System.IO;using System.IO.Compression;using System.Text.RegularExpressions;namespace WikiPageCreater.Common{ public class PageHelper { /// <summary> /// 根据 url 获取网页编码 /// </summary> /// <param name="url"></param> /// <returns></returns> public static string GetEncoding(string url) { HttpWebRequest request = null; HttpWebResponse response = null; StreamReader reader = null; try { request = (HttpWebRequest)WebRequest.Create(url); request.Timeout = 20000; request.AllowAutoRedirect = false; response = (HttpWebResponse)request.GetResponse(); if (response.StatusCode == HttpStatusCode.OK && response.ContentLength < 1024 * 1024) { if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase)) reader = new StreamReader(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress)); else reader = new StreamReader(response.GetResponseStream(), Encoding.ASCII); string html = reader.ReadToEnd(); Regex reg_charset = new Regex(@"charset\b\s*=\s*(?<charset>[^""]*)"); if (reg_charset.IsMatch(html)) { return reg_charset.Match(html).Groups["charset"].Value; } else if (response.CharacterSet != string.Empty) { return response.CharacterSet; } else return Encoding.Default.BodyName; } } catch { } finally { if (response != null) { response.Close(); response = null; } if (reader != null) reader.Close(); if (request != null) request = null; } return Encoding.Default.BodyName; } /// <summary> /// 根据 url 和 encoding 获取当前url页面的 html 源代码 /// </summary> /// <param name="url"></param> /// <param name="encoding"></param> /// <returns></returns> public static string GetHtml(string url, Encoding encoding) { HttpWebRequest request = null; HttpWebResponse response = null; StreamReader reader = null; try { request = (HttpWebRequest)WebRequest.Create(url); request.Timeout = 20000; request.AllowAutoRedirect = false; response = (HttpWebResponse)request.GetResponse(); if (response.StatusCode == HttpStatusCode.OK && response.ContentLength < 1024 * 1024) { if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase)) reader = new StreamReader(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress), encoding); else reader = new StreamReader(response.GetResponseStream(), encoding); string html = reader.ReadToEnd(); return html; } } catch { } finally { if (response != null) { response.Close(); response = null; } if (reader != null) reader.Close(); if (request != null) request = null; } return string.Empty; } }}