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发表于 2016-2-26 16:23:12
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8 ?* ?* U! f- m0 J, M9 t/ A, B2 {" N缺少一个gethtml,用下面这个:, Z% h( ^! `- Q! z# t( M
- 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";5 Q# T; l) q2 m8 D+ m2 i' {9 @' \
- try
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
. D$ u* Z; a) t. d - // 需要注意的:
! H$ H0 F2 F* T) {7 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
`5 K- P% U; O - //这是就要具体问题具体分析比如在头部加入cookie 3 p# f, y% @) `) ]1 a" A1 v- J2 y: ?% ~
- // webclient.Headers.Add("Cookie", cookie); $ l( x9 K6 u" V; H4 ^. Q% R
- //这样可能需要一些重载方法。根据需要写就可以了) @6 N! X' T \% K# g9 X2 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)");- W9 g9 m8 c% X1 I0 N5 z; T
- //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
/ c; Z9 S4 C. G1 H - //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。 4 p5 _4 D3 S4 I6 Q
- myWebClient.Credentials = CredentialCache.DefaultCredentials;* H! V! V/ j- Y( O* s7 N# ~
- //如果服务器要验证用户名,密码 ) @0 T; U O' l3 I' T/ m `5 P
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
& @ a# y, A# `$ @ - //myWebClient.Credentials = mycred;
; w# C8 d6 {! g; m; } - //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)
9 @: j- w D% F5 {' Z; X( T" k - byte[] myDataBuffer = myWebClient.DownloadData(url);
7 v# D! `' H' P - strWebData = Encoding.Default.GetString(myDataBuffer);
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- //获取网页字符编码描述信息 : c4 i; b5 x* r& r9 k: _
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
% S3 F. c: ?& Z - string webCharSet = charSetMatch.Groups[2].Value;
" J9 f- Q$ p* g' y- I; I* c - if (charSet == null || charSet == "")
3 f4 |. F1 M9 d/ S \ - charSet = webCharSet;
2 J: }7 \- V; X, i& J! ~: k - if (charSet.Length > 0)' O7 k! s; w& i+ ^5 a
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- charSet = charSet.Replace(""", "");
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2 d( Z; [' d+ W7 _6 l - if (UseUTF8CharSet)$ R8 p* d3 y2 a. Y# x( c, w- d- d, m
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- if (charSet == null || charSet.Length == 0)2 p! V; R2 G$ b! d
- {
& A3 B% V2 i* L. s, u. h9 v, Y1 Q - charSet = "utf-8";% C$ O& G n! {' g% f9 T* I( M
- }
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8 w9 r: Q0 {5 Z) l# S( c; G - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
4 l( R d- `5 J8 K: n, } - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- }
% q+ J; u8 T! l w0 Y - catch (Exception)/ u5 h3 a K- }5 g4 S# [! ]
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- strWebData = "error";
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: k+ O) k; g' C; b+ `8 N- return strWebData;
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