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发表于 2016-2-26 16:23:12
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显示全部楼层
- i5 P( s, C, M6 n" O: `" G- O缺少一个gethtml,用下面这个:7 {4 D1 `$ x) a% {. V$ q
- public string getHtml(string url, string charSet, bool UseUTF8CharSet)//url是要访问的网站地址,charSet是目标网页的编码,如果传入的是null或者"",那就自动分析网页的编码
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- string strWebData = "error";
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4 k6 t( w: D& ? I p' n$ T& b8 x - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient 4 N( u+ h" n+ `) J! X- l/ x6 s+ I
- // 需要注意的: 8 i/ S+ \+ @# a( V
- //有的网页可能下不下来,有种种原因比如需要cookie,编码问题等等
8 i& S; e& G1 M+ @) E - //这是就要具体问题具体分析比如在头部加入cookie
" p. p* x* G5 D; ~/ H. _. F6 } - // webclient.Headers.Add("Cookie", cookie); ' b: {! [( Q% U7 A2 p
- //这样可能需要一些重载方法。根据需要写就可以了
. B8 o/ _: Z. z: t5 G8 e - myWebClient.Headers.Add("User-agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)");# s7 X+ a1 V" Y- a! u
- //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
# S; r- j# J+ `& R1 S% y - //获取或设置用于对向 Internet 资源的请求进行身份验证的网络凭据。
$ f8 w5 V( J- M+ v8 G% i; u- B7 s% ~) E - myWebClient.Credentials = CredentialCache.DefaultCredentials;
`, y2 w1 z# i; b - //如果服务器要验证用户名,密码 4 l, ~' P3 U" x' y
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
4 @* _6 \. n4 X- N - //myWebClient.Credentials = mycred; ; ?7 M& e; k: u: m$ t
- //从资源下载数据并返回字节数组。(加@是因为网址中间有"/"符号) 1 g, w8 a2 Q: c4 M, v& S/ F
- byte[] myDataBuffer = myWebClient.DownloadData(url);
' e, ^2 B& K# D% {* O - strWebData = Encoding.Default.GetString(myDataBuffer);
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+ T. v' Q7 f. O2 P, b* o% _" v3 D- //获取网页字符编码描述信息
; e& E. U1 J( Z1 {: R+ E; W- L - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
; S7 x, U' j* C- B - string webCharSet = charSetMatch.Groups[2].Value;- h& |- f% o5 y: L, L( D' q
- if (charSet == null || charSet == "")# v# W T- G% S7 L& O5 k1 A
- charSet = webCharSet;3 E% f! ?% l/ s+ ?5 l( e2 H
- if (charSet.Length > 0)
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- charSet = charSet.Replace(""", "");
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- if (UseUTF8CharSet)4 C8 l0 ?. a3 @
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- if (charSet == null || charSet.Length == 0); ?9 r4 m' z' ]0 }% c6 E* ~$ I
- {
, a/ ?3 k9 q0 [+ d2 U3 | - charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)$ G6 T- ]7 T6 O
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);4 W: P9 D8 u) z2 ?, I
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- }
6 [' X# `7 r# E" `4 f - catch (Exception)9 ?/ m6 J/ _; X$ \1 Q
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- strWebData = "error";
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+ _3 ~2 d& ~, N# a5 x( \, K- return strWebData;- Y/ D$ ?% z$ F+ R: _) p
- }
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