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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:
: T c) e& t* s% i4 {6 b1 W- 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 & u/ N; _: b/ {4 k6 j
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- string strWebData = "error";
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- {
+ _- B4 B9 n# J, ]* `& x - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient % D8 X( C& y9 z5 Z
- // 需要注意的:
; I2 F1 H( k" `* W$ W4 }' L O4 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 4 {) S& B# c$ u3 C
- //这是就要具体问题具体分析比如在头部加入cookie
( l2 R$ S5 c& d* @ - // webclient.Headers.Add("Cookie", cookie); 2 Y. P& r0 X; C% F# p( s( B$ M
- //这样可能需要一些重载方法。根据需要写就可以了! u9 B1 P* { N, v9 x
- 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 H& L5 m- D0 R. P; O - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
2 @$ M; G0 A9 w+ O3 _ - //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。
2 {6 b% G" i% W. M* } - myWebClient.Credentials = CredentialCache.DefaultCredentials;. N4 B+ m" G) N8 t S! b. ?9 B
- //如果服务器要验证用户名,密码 ! U6 _8 Y/ D; P5 ?0 Z
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
$ h! _; m3 [- Z8 A. H; d - //myWebClient.Credentials = mycred; + J; J. j1 m, {$ S/ @
- //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) 2 S }: V( w" R8 K/ d, j/ m' A
- byte[] myDataBuffer = myWebClient.DownloadData(url);
$ g5 }2 g8 a. n+ ^; n2 ^4 U( \: n, y - strWebData = Encoding.Default.GetString(myDataBuffer);
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! }1 J6 v4 A. D+ h* G1 K3 |( ]1 K4 _- //获取网页字符编码描述信息
$ M6 J. w3 }8 }/ p - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);" T, z. v- R, U1 ~
- string webCharSet = charSetMatch.Groups[2].Value;
; z3 M3 F- D+ s7 t9 e" K. K! C6 M - if (charSet == null || charSet == "")
0 T1 R" A# Q. }$ ? - charSet = webCharSet;4 a: |6 q! Y( _# v4 _
- if (charSet.Length > 0)- [ h, _; i$ ]* z6 z
- {
, q; A. o9 R! z1 r2 z$ ^+ v - charSet = charSet.Replace(""", "");
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( I2 p5 Y' T& A& n- Y - if (UseUTF8CharSet)
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6 W/ f! R4 L1 `, D# U - if (charSet == null || charSet.Length == 0)
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- charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
8 d, R9 h3 `& |& r' q) a - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- catch (Exception)
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- strWebData = "error";
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- return strWebData;
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复制代码
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