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发表于 2016-2-26 16:23:12
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9 g0 c" w9 `! l缺少一个gethtml,用下面这个:% y0 C* f6 V- l1 D- I4 N
- 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 ?) Y" {) R4 }8 J- L
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- string strWebData = "error";
- H- C) W! f: a5 B2 E - try, Y! o$ K' [( C9 R& s/ U4 b
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
A5 W; A" z- m7 D" Q - // 需要注意的: 7 d+ U, }, w e- [' {, Z9 D
- //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 9 l4 M% {( P1 X7 B0 ]7 Z- b
- //这是就要具体问题具体分析比如在头部加入cookie
% M/ v/ t2 {+ J' V* e7 }: R. N - // webclient.Headers.Add("Cookie", cookie);
+ {. V) b9 V! U! K/ o - //这样可能需要一些重载方法。根据需要写就可以了
2 f u" Q i: {) a# e; O2 I" Y - 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)");
, Q/ H" G- \- d4 w - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
, C+ ~1 a/ a; s' a ?4 D; u1 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。
9 \+ U, r# }! `8 X4 P; @ - myWebClient.Credentials = CredentialCache.DefaultCredentials;) }4 b1 y& [6 V
- //如果服务器要验证用户名,密码
4 d" r! _8 F @7 B2 G - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
% h3 W) z9 L6 {, p7 k- W6 Z - //myWebClient.Credentials = mycred; $ w# A( }" v0 S E3 f
- //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)
3 H$ s* A f% Z/ i0 e9 \ - byte[] myDataBuffer = myWebClient.DownloadData(url);2 `+ q7 E, k4 \( G4 l
- strWebData = Encoding.Default.GetString(myDataBuffer);
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- //获取网页字符编码描述信息 9 y- A" O$ I3 H. `# l& `
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
& N8 t' c" X# M# M& P' Y" N4 I - string webCharSet = charSetMatch.Groups[2].Value;2 _! ~5 i' U, W5 I' l
- if (charSet == null || charSet == "")* c' p, Z# u3 m$ p2 W: ]7 O
- charSet = webCharSet; o+ ~' }+ r1 U; j
- if (charSet.Length > 0): [ [0 f. p, @5 y2 K
- {
- \$ M8 R% v8 H - charSet = charSet.Replace(""", "");0 d4 D( n+ n2 l
- }
" n8 T) a4 `3 C, q8 ?5 g- W4 o4 O - if (UseUTF8CharSet)" s- o& z3 N6 k
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- if (charSet == null || charSet.Length == 0)
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- charSet = "utf-8";! m5 e: @5 H% |( x: L, J9 a" }
- }
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, Z4 t1 T* X* f, W, @4 { - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
9 x- k: A: `+ s h - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- }
: R! l, T" v! X4 s1 `1 ` - catch (Exception)
! g+ C8 H* _1 |; s. G - {
: w) h4 ~6 ?5 f- T - strWebData = "error";! _% M3 r! z8 ?* C6 W& w( Z+ h! t
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/ Q. \1 T* X2 }* C2 C% e3 M- return strWebData;! B: h: x k% v; L# e* R! \
- }
复制代码 9 q( {2 J. `+ ?2 f3 O$ k
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