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发表于 2016-2-26 16:23:12
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& Q; R9 s, y) s% ~缺少一个gethtml,用下面这个:
! S8 O8 y- n! o! K- 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
2 z8 G5 I& X3 B5 U3 L - {
0 N* R2 i+ b2 S w: }5 C - string strWebData = "error";
0 l4 C" ~ q0 C) E - try
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
) ^' Y+ k8 d. [7 m - // 需要注意的: : H3 j' O& V% `9 S; w
- //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 N& F u* j5 m0 p - //这是就要具体问题具体分析比如在头部加入cookie ! a# ^. _8 T% |+ `
- // webclient.Headers.Add("Cookie", cookie); 3 a; R7 f* |0 |$ a, ^( @! @ z
- //这样可能需要一些重载方法。根据需要写就可以了) j7 J" k5 m) m. a# A2 z$ |
- 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)");
/ ], h2 h9 g* } r" i9 x0 j" O; M5 G4 k* v - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
4 s X& i7 c, Y - //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。
& V9 k' V1 a7 z7 G y - myWebClient.Credentials = CredentialCache.DefaultCredentials;
, ]$ ^% W9 k5 o' c - //如果服务器要验证用户名,密码 9 l' k3 r; M: H+ Z; |
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
) t# t8 @5 R4 T3 L& B/ Q, y5 A& j - //myWebClient.Credentials = mycred;
2 ?" G! ]2 h+ p5 m% l9 [) w - //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)
( W. {- {% T) O/ `9 G2 k - byte[] myDataBuffer = myWebClient.DownloadData(url);
d! H' n% X5 P - strWebData = Encoding.Default.GetString(myDataBuffer);
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- //获取网页字符编码描述信息 0 @' k0 u2 l# x6 o+ ~7 K5 a) h) A
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
+ O: C+ x- ]* Q2 O4 s5 x - string webCharSet = charSetMatch.Groups[2].Value;
, J/ i) k. u. G: \ - if (charSet == null || charSet == "")! {- _6 L" d+ M8 w! t5 x" L9 [
- charSet = webCharSet;
$ m: z4 P$ _: n5 G5 P - if (charSet.Length > 0)3 R7 P6 d0 k4 p; @
- {" m0 s) H* y; M3 W8 E
- charSet = charSet.Replace(""", "");
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- if (UseUTF8CharSet)& g, K5 S" d' c0 d0 b
- {4 k. g" v& I; c2 c' p6 R- f% [
- if (charSet == null || charSet.Length == 0)+ f' J7 `* j9 ]4 w/ t; W
- {
$ f" O+ ^: {- u0 D; q - charSet = "utf-8";
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- }9 z% ?3 X- d* \; h2 f6 }
- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)0 N7 `. d7 ^& T1 x& X1 q
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- catch (Exception)6 A }# Q. X% j" M2 A% R
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- strWebData = "error";
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- return strWebData;
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复制代码
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