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发表于 2016-2-26 16:23:12
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1 i) W4 Y! R J( h' I o$ q缺少一个gethtml,用下面这个:
3 r$ e5 @5 x) K- 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";& {/ p9 k' @9 y# a8 z
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient 3 u) @$ m1 |. t D. _4 C: X
- // 需要注意的:
+ T9 Z+ E# Z3 G, a5 [0 e - //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
" X/ E' m C. a2 y' @+ n7 W - //这是就要具体问题具体分析比如在头部加入cookie
# v* l1 _, }! t3 Q$ h - // webclient.Headers.Add("Cookie", cookie); . P/ `% y) h/ ]( }# G7 b
- //这样可能需要一些重载方法。根据需要写就可以了0 m8 i$ R& }8 i# l, h
- 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)");; h ~+ r0 R! g& W. e
- //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
F. e5 g9 {8 [3 G) z9 ` - //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 q% C$ O N! L
- myWebClient.Credentials = CredentialCache.DefaultCredentials;
# I, Q# T8 E$ K$ ]' |+ e% V0 L - //如果服务器要验证用户名,密码 8 r6 A G& {' ?; L! M* E6 ?
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword); 6 U4 ?4 O* _, V* P* y
- //myWebClient.Credentials = mycred; , X0 B" ]2 D* N4 A$ n5 a
- //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)
) Y5 f3 K9 m3 d; |* l; M - byte[] myDataBuffer = myWebClient.DownloadData(url);
" q, `6 B6 b& |7 P. h - strWebData = Encoding.Default.GetString(myDataBuffer);; B4 u8 J. H# V1 i
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- //获取网页字符编码描述信息
6 J! T- e: R! z$ Q3 u - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);; ~9 f4 f9 ]4 C! I# _) W! v8 S
- string webCharSet = charSetMatch.Groups[2].Value;
) M" ~0 J( m: l" n6 e9 N - if (charSet == null || charSet == "")& X( J% t* n' t# }1 w
- charSet = webCharSet;* R. @7 C! G" X }" l7 d
- if (charSet.Length > 0)
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& C: {8 ]% D5 \ - charSet = charSet.Replace(""", "");7 M0 S: K- f/ f( g7 \5 [
- }
# ]* |9 [9 R9 P: k0 Z" o" d0 f6 I - if (UseUTF8CharSet)2 X. U* f N i# E4 o
- {
4 s q7 k5 W2 |4 o2 K+ S - if (charSet == null || charSet.Length == 0)
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& \6 @" Y% c6 W - charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)1 u, V. S7 t7 P5 l- N$ T% m
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);" R; {3 v( i" t9 \ F# J: t
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- catch (Exception)
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- strWebData = "error";
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3 M& V+ N1 ^6 a4 \/ z- return strWebData;2 d# J8 t) [3 Y' z0 Q' |
- }
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