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发表于 2016-2-26 16:23:12
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' C9 V- A+ b0 g: z2 @% K$ ]6 N缺少一个gethtml,用下面这个:
9 e/ d ]+ ^' @. `* K# |6 ~- 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";
, z* P4 l5 `2 Y: x* \( \& y2 i3 C* k - try# V' [2 P p, Z# g) ~/ R/ G
- {
0 g* ]2 J1 A( P$ P/ o+ w; I - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
7 E4 N! G" {) k% W m2 _+ i' H - // 需要注意的: # Q5 \; t- j% H3 n0 E8 z
- //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 7 H& P" x# D& i4 A9 t
- //这是就要具体问题具体分析比如在头部加入cookie
' Q: O5 x& i3 C' e: D - // webclient.Headers.Add("Cookie", cookie); 4 b- `( e( a7 _4 h" ]4 R
- //这样可能需要一些重载方法。根据需要写就可以了/ z! o V: O2 X2 D. g
- 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)");
6 z0 f$ o- x6 w9 w- Q( S - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");& _/ R, z7 i* p9 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。 ! C9 O h3 F( y1 g7 r
- myWebClient.Credentials = CredentialCache.DefaultCredentials; `" H* l# u0 j7 A/ y/ W- U7 v
- //如果服务器要验证用户名,密码 * a) G8 Y8 n5 H3 r8 |
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword); 2 }! o$ t3 I" M; R, c5 T( ^
- //myWebClient.Credentials = mycred;
6 r2 V3 u! W) 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) 5 Z0 O2 F: n" M! `( C+ }
- byte[] myDataBuffer = myWebClient.DownloadData(url);
" L: I1 {" L9 \8 E! z5 j- z+ V# ] - strWebData = Encoding.Default.GetString(myDataBuffer);
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2 [! Q0 Z }, w4 C- //获取网页字符编码描述信息 7 A8 }4 ~" ^3 f2 R, \% \
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
' r. ^; l* q/ u6 L6 j3 ~ - string webCharSet = charSetMatch.Groups[2].Value;
( p6 V2 A3 H6 E# [5 v - if (charSet == null || charSet == "")0 L; P) S# v) C: d
- charSet = webCharSet;, N4 I3 {8 [0 y& i( S. e
- if (charSet.Length > 0)+ K+ \1 ? |1 D* A8 u8 V2 G
- {
) y$ q% p) x( A2 B8 z& e2 } - charSet = charSet.Replace(""", "");# k7 K/ l5 |9 S$ i8 D
- }! Y3 D2 g+ m( B& n: h) i' G k% T
- if (UseUTF8CharSet)
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- if (charSet == null || charSet.Length == 0)
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* {1 X2 j# g) V: \, L+ D6 z( i - charSet = "utf-8";
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2 v6 t( s) D3 ]. |, [- b - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)0 E3 Y, }, I9 j; R5 @2 f
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);/ ^: E; f6 P1 D% v1 p$ N* h
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7 f |0 F' c0 [; d% u' c3 ~* c - catch (Exception); [, f$ w3 l& Q7 t
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- strWebData = "error";6 W# t6 |) f+ x0 H7 {2 ]- v U
- }
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- return strWebData;
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复制代码 . R; z2 S& ~" \4 p* x- }) A/ f% `
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