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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:7 N! q2 ?! F3 f" @. i7 V
- 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 ' r+ v, R; U) @- G0 A
- {
( x- |; N4 X: g1 u) Z7 {, f - string strWebData = "error";. }! t8 G& _' a* Y
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5 G5 O/ @% m8 }* I5 s/ C+ r - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient & C6 d$ w: s( r4 V! U6 `+ A7 g
- // 需要注意的: " D+ R% l4 W$ y
- //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 6 j8 M7 P2 R. ]3 ^; ?
- //这是就要具体问题具体分析比如在头部加入cookie
6 j$ R: H7 {* |/ p - // webclient.Headers.Add("Cookie", cookie);
0 t- H* v$ j+ b$ ]- f: K - //这样可能需要一些重载方法。根据需要写就可以了
% Z' v5 K, }. q- V1 J, \* \ - 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)");
) U) Y" a: ~: F4 F* E - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
% O* b& T& d% m5 l2 B" i - //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。 0 w: F5 D3 G. V% p1 N
- myWebClient.Credentials = CredentialCache.DefaultCredentials;% l4 V6 s1 C; @5 m7 ~) [
- //如果服务器要验证用户名,密码
4 u# X- a9 z* h9 Q9 i - //NetworkCredential mycred = new NetworkCredential(struser, strpassword); " W0 o/ _; K+ B' B ~
- //myWebClient.Credentials = mycred; 0 Z. A6 w5 a$ k1 c1 ]4 }
- //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) " \7 H2 c& z, S( P3 b, e) E3 Z
- byte[] myDataBuffer = myWebClient.DownloadData(url);" R( Z- y' ~1 [7 G$ F6 _, Z
- strWebData = Encoding.Default.GetString(myDataBuffer);2 |6 r/ \) R& a7 i. _
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- //获取网页字符编码描述信息 / Q W; M% [5 A0 m
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
& ]( o9 \8 W+ Y4 q! r) Q8 D - string webCharSet = charSetMatch.Groups[2].Value;
: S" ^& t% \: O4 U: E6 W - if (charSet == null || charSet == "")
7 u$ g) e9 ^, |9 d - charSet = webCharSet;" v, N- e8 W9 z; J4 T! X9 `
- if (charSet.Length > 0)
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- charSet = charSet.Replace(""", "");
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' Y/ _' U. ]8 C. l2 n - if (UseUTF8CharSet)
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e o1 }8 Y; ` \6 a; M - if (charSet == null || charSet.Length == 0)# R0 U+ K( l% h- u. v, o) L& _' I
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- charSet = "utf-8";
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- }
8 L- {8 Z# P( R, ^ - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
0 a0 W" d6 P: K - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- catch (Exception) d/ J; U) h6 X5 @: [* X6 |6 ]5 M
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- strWebData = "error";" e! _/ F1 d( N4 ^
- }
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6 [) _/ c7 C3 \- m4 r- return strWebData;0 ?& Y1 u- X' y& J. J- Q
- }
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