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发表于 2016-2-26 16:23:12
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- A$ ?+ F- E* w4 t' _+ B缺少一个gethtml,用下面这个:! O, ]1 V9 |+ @: y; N, B
- 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
3 [* s) X& h0 Y7 P" X - {
# K: g8 ]. G/ d# U - string strWebData = "error";
( _! E: ~. }! H1 X9 M0 q8 H - try
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient ; [! h8 b! I# f9 X$ @4 T3 _
- // 需要注意的: : x3 Z8 y; O) A7 Z1 a0 Q" u5 U3 U$ 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
+ n$ j: ]/ S# J. c: D6 I+ i( m - //这是就要具体问题具体分析比如在头部加入cookie 2 S* k# y3 U6 E/ U
- // webclient.Headers.Add("Cookie", cookie);
: D% b6 n4 C7 @1 y3 C# r - //这样可能需要一些重载方法。根据需要写就可以了# O* C% E$ o2 T0 Z2 {
- 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)");
; f0 A5 [6 w) k- Z, I& F - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
* n5 `: _& k1 X: p+ w- o3 r - //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。
8 U1 Y2 y3 A4 h9 H6 C6 n% M - myWebClient.Credentials = CredentialCache.DefaultCredentials;& j2 S& D1 i H9 U- P2 v
- //如果服务器要验证用户名,密码
! J0 n5 r3 D1 @+ N# S - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
5 i/ ]! h: {9 N; D; \; s5 s - //myWebClient.Credentials = mycred; / Y; R7 p8 p1 J8 c% T& G
- //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) * ]: ?8 H+ T+ i2 v
- byte[] myDataBuffer = myWebClient.DownloadData(url);* |/ o9 X' o' S2 f/ K( p4 Y0 z
- strWebData = Encoding.Default.GetString(myDataBuffer);) b$ V3 |( T& y/ z; h1 c+ r7 F" G4 T
- ; p' M, ~5 ^" v: [& j
- //获取网页字符编码描述信息
j- ^. l( ~- w* O - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);( ^/ m, Z, h9 w1 L
- string webCharSet = charSetMatch.Groups[2].Value;
+ \6 T: | {5 {# e4 N5 ?# H5 ? - if (charSet == null || charSet == "")
1 R/ Y3 O Q& S3 p" p0 ~- \5 T - charSet = webCharSet;
7 b' J9 U8 m" O! q% u0 j, R3 E - if (charSet.Length > 0)1 K+ i4 i# Y) g# n. Z/ D
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- charSet = charSet.Replace(""", "");
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- if (UseUTF8CharSet)/ ?5 ]7 D, V7 N% n
- {
" t- J( ^. X! a" ]0 B - if (charSet == null || charSet.Length == 0)
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- charSet = "utf-8";% e; y% t$ Z: l8 V
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- }
! l" C3 i8 f* M5 [ - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)" i* Q$ f3 F6 ~3 ~
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);8 |7 u' U8 Q+ }1 V* ~1 Y) Z
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- }
/ l1 D$ H0 y: y. w - catch (Exception)
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- strWebData = "error";1 [! a) m2 X! S: [/ t+ a
- }
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- return strWebData;( }9 p$ I. A& [$ Z( V) U
- }
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