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发表于 2016-2-26 16:23:12
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1 T& x- W1 X0 [1 ?: m3 `缺少一个gethtml,用下面这个:
. i0 y. r# b6 r' N8 j- 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";: K w* ~, |1 \+ l
- try
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% c( n+ f0 D$ z3 l2 R) D- w0 U - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
8 ~2 V4 ~* u3 P1 V! z# Y - // 需要注意的:
# e$ h* P, C, q3 j - //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 V9 l3 N+ j$ \6 Z( c8 S8 H$ y' ]
- //这是就要具体问题具体分析比如在头部加入cookie
8 \5 Q4 R5 x) n+ t - // webclient.Headers.Add("Cookie", cookie); ( w2 V& ~! l z$ Q
- //这样可能需要一些重载方法。根据需要写就可以了
8 T7 X" q$ h: h - 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)");- b# [, M" p4 M) T' v* ?. u' [) C1 k
- //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");& L/ k2 j0 x5 x( K- 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。
! n7 e! n8 c4 R7 z3 V$ a - myWebClient.Credentials = CredentialCache.DefaultCredentials;* y0 o6 q( i @6 A# }7 k0 {+ k$ O
- //如果服务器要验证用户名,密码
* d, @9 J6 o1 }! N7 I; E, i - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
6 c7 ~6 s! c$ a" b7 q6 P: S/ ?8 \ - //myWebClient.Credentials = mycred;
3 q+ o, e6 I: p+ F# F' m: b - //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)
! d; b8 Q* u7 g3 D7 r$ \ - byte[] myDataBuffer = myWebClient.DownloadData(url);
* O5 q- Z. Q g" O7 X - strWebData = Encoding.Default.GetString(myDataBuffer);' q% e5 L) d5 N* K
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- //获取网页字符编码描述信息 ) g0 N& O! H/ d) x5 a2 B- h9 W
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);' N* s0 a4 J9 z. m
- string webCharSet = charSetMatch.Groups[2].Value;
- k8 d; q* ?. j( S3 c - if (charSet == null || charSet == "")& V. K- o# p" l4 P& E+ J Q) A! J
- charSet = webCharSet;9 l. ?/ y) a P3 I: G' W+ |; c) v* J
- if (charSet.Length > 0)1 j# k% A. t' j" O; x: R
- {
4 a/ k$ p" q* n/ G# G2 @7 e - charSet = charSet.Replace(""", "");! m( F2 E/ [0 g/ E; o
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- if (UseUTF8CharSet)( _$ \2 t1 O N1 E( k; ], ~
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- if (charSet == null || charSet.Length == 0): q) _9 P5 Q+ o6 f
- {
% T6 S: A6 _, E& x8 X6 ? - charSet = "utf-8";4 i3 {$ ?+ u; n, w- N& n: M: H
- }
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)2 v* f2 F% _; w: a
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);% G9 x- ]9 o8 ^( i7 F1 R- U7 D
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- catch (Exception)
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- strWebData = "error";
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& }2 r4 r( U& r- T- return strWebData;
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复制代码
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