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发表于 2016-2-26 16:23:12
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4 P, t; v$ A/ s+ d* R) Z/ F缺少一个gethtml,用下面这个:
`; |% o( n6 r' 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 " M% _4 n3 z5 {2 q8 Z9 i
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- string strWebData = "error";
" n$ y R" d' C8 g% [5 V& [ - try
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
% N% a) ~7 v, U" u# B+ | - // 需要注意的: 7 b" `+ X/ d0 ~0 t
- //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 G) {! A6 S! Y9 J6 D: r7 |7 J8 \6 F) L - //这是就要具体问题具体分析比如在头部加入cookie
U: O: m# f( b) L5 V: j - // webclient.Headers.Add("Cookie", cookie); - r7 s! t0 h, f) ?& s. f6 t+ w
- //这样可能需要一些重载方法。根据需要写就可以了* d7 L) _! n* m
- 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)");
5 @9 |. B$ `' s% ^' U; h2 Y, P - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");1 P2 }9 q& p' ^7 o
- //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。
) p5 C7 \! k1 c! W8 E% h' p - myWebClient.Credentials = CredentialCache.DefaultCredentials;( n0 V" j f# ~
- //如果服务器要验证用户名,密码 4 S+ @* ^1 S; \0 ^
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword); * Z4 p6 D; D. i' Q- l1 P8 s M
- //myWebClient.Credentials = mycred;
- C5 u3 d3 Z0 c - //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) 2 X/ k0 M5 h; _9 r" q8 I3 [
- byte[] myDataBuffer = myWebClient.DownloadData(url);
+ T" D' \: i' n1 z! |, M) A }: [0 q, l - strWebData = Encoding.Default.GetString(myDataBuffer);
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" e/ \1 G4 H) t- //获取网页字符编码描述信息 . q. l& X. m# a$ m: L
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);' G! W4 Z5 b$ T* A& G2 C$ y n" P
- string webCharSet = charSetMatch.Groups[2].Value;
" e# G! N, _; T/ a! @/ e - if (charSet == null || charSet == "")
7 _; S& o+ g+ n/ G: M. N; h6 F - charSet = webCharSet;
( ?9 l" _+ R% C' y - if (charSet.Length > 0)# {2 H* j6 i& y: U$ x' p) h
- {
& Q7 ~% f+ t; Y3 i' H - charSet = charSet.Replace(""", "");, j" `6 V* {- D2 i0 S3 w
- }
: I$ B" t6 X- `( ]% Z: d: e- ] - if (UseUTF8CharSet)6 ]# B4 J& t5 p$ e1 E
- {- N+ ^' R- I( s
- if (charSet == null || charSet.Length == 0)
& v8 \8 C* Q' j+ m. z* n) C, B - {
8 p# |' G! @, o/ {, t$ R* b) p8 h - charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)$ h, c! n6 Z* A
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- }
) ~7 R2 ]1 U7 n7 ^2 p* X - catch (Exception)& p! a! |6 v0 A/ z
- {
+ k, Q: D. _+ a+ p% r) A% L - strWebData = "error";# i) L" g) u7 d7 d" l5 U
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6 B3 U* ^' a" L- return strWebData;, k4 O8 \5 S6 R# J: I. A
- }
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