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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:6 Z/ \* t( Z% u, N/ C( Q _( I
- 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 8 Z% T/ `& k. j% U# K5 [
- {
G$ {& v+ |2 B4 W8 p& K7 O - string strWebData = "error";
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient : k5 P. C6 L# T& @! a+ }
- // 需要注意的: % |' v. d! q4 b- m% j; G6 s
- //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
3 c/ a2 P% O, m! b2 ~) f - //这是就要具体问题具体分析比如在头部加入cookie p2 J7 f5 J0 T4 T1 j6 G
- // webclient.Headers.Add("Cookie", cookie); & k% q- r& o$ B& `
- //这样可能需要一些重载方法。根据需要写就可以了3 [' t6 Y- Y/ r* M7 o9 K5 E7 C6 [: A
- 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)");
. o% ~) |& ~- w( O( g; ?1 i - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
1 n' z& H. k3 b* O6 R - //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。 8 @- a8 `1 n0 s6 l
- myWebClient.Credentials = CredentialCache.DefaultCredentials;
9 l7 x& B$ O: C2 X. U4 A# v0 ^ - //如果服务器要验证用户名,密码 7 H! o- C% ]; k2 w2 t
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
" z$ u0 U p1 R' ~ - //myWebClient.Credentials = mycred;
& e3 k# l( i, l; o - //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) 4 A) C' d( N3 |, t
- byte[] myDataBuffer = myWebClient.DownloadData(url);% }/ y0 U& S, x# U
- strWebData = Encoding.Default.GetString(myDataBuffer);6 H, ]1 p' f) z$ y( {9 P
% y4 M& X* F( E2 _- //获取网页字符编码描述信息 ' \4 S9 N+ E2 ?6 w0 O& g
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
4 W6 n* A7 [+ |# i - string webCharSet = charSetMatch.Groups[2].Value;- Z2 r' }1 v9 z; q; z
- if (charSet == null || charSet == "")
' q E) n; p' H6 y# W - charSet = webCharSet;; U$ @$ L1 C' ~/ U" J! i+ R ?
- if (charSet.Length > 0)4 ^, G. ]8 |, H# S+ `) _
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- charSet = charSet.Replace(""", "");
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- if (UseUTF8CharSet)
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- if (charSet == null || charSet.Length == 0)
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- charSet = "utf-8";
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- }
7 [6 I! v2 C6 o% n - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default) j5 v' l. g4 T' m3 P. l7 A9 u
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- catch (Exception)
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% u# r% G/ ?7 F) d+ D& j - strWebData = "error";" U* d* E! V& K+ e" t/ \
- }
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- return strWebData;# q% ] o8 V3 R3 n5 ?8 S
- }
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