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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:9 A4 S( F1 V% n2 l: u) R
- 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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, A0 A" I3 \3 Y - string strWebData = "error";3 I$ G/ Q- P# I' N) |
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- {
4 m) I* K* e! f9 p: e; y - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient # @) V' J" {0 W: {# k/ C. t% {
- // 需要注意的:
! A" M, A/ @$ H8 N - //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 `0 m/ g$ L6 D3 I* l0 s% j' c. i1 K - //这是就要具体问题具体分析比如在头部加入cookie
; H7 P# C6 P5 H0 o, K7 t* x - // webclient.Headers.Add("Cookie", cookie); 0 W- _" |& H1 Q, {. @
- //这样可能需要一些重载方法。根据需要写就可以了
' a* p( |- Q* c0 G9 N$ T0 m4 D% E - 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)");
( N6 x1 S K# J4 q - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");' N; w3 C6 T. o% ]& x6 k# u' Z
- //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。
- H' Z1 _: T H4 {* a( M d# | ^7 M - myWebClient.Credentials = CredentialCache.DefaultCredentials;
/ g+ ]0 X0 | n+ `( y1 l - //如果服务器要验证用户名,密码 ! _% ]# Z; p4 g- b& ^4 c* E c
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword); 5 Q; ^. H+ p/ R3 k0 S/ d
- //myWebClient.Credentials = mycred;
' M2 i4 x _7 T% C2 J - //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) 6 w# M8 A7 D N" e5 \9 K8 p
- byte[] myDataBuffer = myWebClient.DownloadData(url); c: E7 v9 R6 V' \: ]
- strWebData = Encoding.Default.GetString(myDataBuffer);
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+ E4 W" j) X+ [; J# o- //获取网页字符编码描述信息 8 P z R8 W) I4 v4 j' P6 i0 y
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
# u/ y) ]5 R8 B* \4 U0 t$ y, \7 k - string webCharSet = charSetMatch.Groups[2].Value;
9 j5 m2 A# D' C# v1 g - if (charSet == null || charSet == "")
- X+ k3 X5 R o% x - charSet = webCharSet;7 | h- T+ Z9 q; E" b
- if (charSet.Length > 0)0 V f1 p$ O) |# y$ j( e* B3 K
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- charSet = charSet.Replace(""", "");
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- if (UseUTF8CharSet)0 a; h9 t7 Z) a. P# K9 c) U
- {
. i) w/ g( P y# P% a - if (charSet == null || charSet.Length == 0)$ z% b1 e4 v) T' }5 ~( B' z( ]
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- charSet = "utf-8";5 Z5 D4 y0 |; T& l: t9 c
- }
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" w3 P8 f2 E9 O. k: w, G - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
! l2 x! H$ I! b - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer); F2 B) a) R I9 u/ i$ n0 @+ o
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5 }6 d8 P& U+ X6 ]. c4 Y2 c - catch (Exception)# g9 q% n; h3 t$ s! J
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- strWebData = "error";( X5 }/ p( k! H9 ~
- }
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% w8 D1 t* |+ v- w- return strWebData;, X. N4 Z) Z9 f+ Q `
- }
复制代码
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