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发表于 2016-2-26 16:23:12
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缺少一个gethtml,用下面这个:
) V8 B. d; p4 {; c! ~- 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 5 K N- }6 t+ ^5 Z
- {( }% _! a8 q% q& Q1 R# _" }
- string strWebData = "error";0 w* k0 A' s# W* s; h, D: j5 o
- try) m2 ~) f$ K+ C8 ^9 }
- {
& e n9 f9 Q8 g& R6 S. Z8 J - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient 2 U! V3 K0 H/ a7 w" ?* d# z
- // 需要注意的: ' y' |; s) K* Y t0 I @1 U9 W
- //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 X# O( [& W& y! [ - //这是就要具体问题具体分析比如在头部加入cookie 2 M$ o; r1 Q; Y
- // webclient.Headers.Add("Cookie", cookie);
# L, J7 d% `) y: l& ` - //这样可能需要一些重载方法。根据需要写就可以了
' h; P! B! T7 E, e( C$ r - 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)");
1 _3 v* S4 b$ ]" i! N# w' F5 d6 q/ v- g - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");4 p! S! E$ }+ E6 n
- //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。 4 u0 B2 U. l$ m! E1 F6 n" S) ]% M
- myWebClient.Credentials = CredentialCache.DefaultCredentials;, a) x3 ?$ b) }2 Q: p( Z+ I2 ~
- //如果服务器要验证用户名,密码
4 x/ o& R# I2 q) f6 A0 @, I - //NetworkCredential mycred = new NetworkCredential(struser, strpassword); / c4 Z/ u8 E/ u* r
- //myWebClient.Credentials = mycred;
2 T; H; D! d' M: ^- Y - //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)
" H3 C7 C4 r9 @+ ~$ t8 h4 j - byte[] myDataBuffer = myWebClient.DownloadData(url);) W- ^: O9 r& U$ X H
- strWebData = Encoding.Default.GetString(myDataBuffer);3 X$ I& M- q# P, N) I' O
! {2 p! F8 X S3 K8 L( ^- A- //获取网页字符编码描述信息 8 q& ]+ n- I D R" e9 V
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
9 U. Z0 `7 e6 M* N b9 G- j( h - string webCharSet = charSetMatch.Groups[2].Value;9 ^. a6 Z [. Q8 @/ O ]* O
- if (charSet == null || charSet == "") U$ p0 N8 L0 k% ^$ z$ v
- charSet = webCharSet;2 F: k; d4 k" `" j; m0 b+ Q
- if (charSet.Length > 0)+ G$ I+ M5 X @' C( W8 ?" H8 L
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- charSet = charSet.Replace(""", "");
2 b) G& v0 X* s' E* M# N! \) [# \ - }
3 F# z5 k3 T) } h9 ^ k - if (UseUTF8CharSet)5 _2 E/ t2 j% {, ?8 T
- {
/ S' d, |% x+ w, K9 K - if (charSet == null || charSet.Length == 0)4 z+ L4 ?. Q! I$ J, P
- {
; J& H0 j' u% e$ e2 p e - charSet = "utf-8";
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6 J' s* K1 A: g7 Z- X' p& @7 Z - }% w4 W8 n* |5 s# y/ E
- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)% r5 E( m+ f _' c4 l! e
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
/ |4 z8 p7 d! A+ C3 I& I
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, T& J1 W. ~/ N/ U. v - catch (Exception)2 d/ ^! c3 G6 q7 ?: p' i/ j3 ]
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- strWebData = "error";9 j+ q: J6 c1 n% }, U* C$ `9 t+ O
- }
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- return strWebData;& I& D% n0 C) g- e8 q3 n- B. j" h
- }
复制代码 7 m, m% K _% R O0 c; X, _
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