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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:3 V0 `* d5 ?7 X5 y0 q- Y2 A
- 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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1 M1 J" {3 O. ^; n) \ - string strWebData = "error";
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7 m, n# ]( @1 S; D: `- T/ k - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
9 `' P# L5 R2 n n5 a - // 需要注意的: 5 ^' p/ U8 D7 `" r+ r! 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 & P: }" Y- G& p8 `* }7 n6 {
- //这是就要具体问题具体分析比如在头部加入cookie
! [; n8 D. s: }" L- y# { - // webclient.Headers.Add("Cookie", cookie);
" w/ O t* U4 z9 T - //这样可能需要一些重载方法。根据需要写就可以了
`, {* K7 U8 Y8 o% c - 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)");
9 T2 f" B2 V# v4 t" E - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
8 @" P1 E1 I7 a - //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。
* d+ o2 x+ V7 S3 S' z, L6 j" q$ h* \ - myWebClient.Credentials = CredentialCache.DefaultCredentials; X5 V1 z1 a$ G6 v3 m! H
- //如果服务器要验证用户名,密码 - F' |5 d6 M+ i$ A8 A% G/ E
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
0 z& c" a9 Q& [) a( x - //myWebClient.Credentials = mycred; & p. T' \( z% F" N
- //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)
: U& m0 b6 J+ H7 d- a6 t3 V& q' Q - byte[] myDataBuffer = myWebClient.DownloadData(url);# G9 R4 ?. Z7 T6 d# o/ h0 g
- strWebData = Encoding.Default.GetString(myDataBuffer);3 N, ?& _2 ]% l+ u1 E; x% i
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- //获取网页字符编码描述信息
" N/ ~8 n" N7 k% n; y - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
# r% G7 P% m: L. s1 n3 E4 b1 y - string webCharSet = charSetMatch.Groups[2].Value;
F0 u3 j* ^0 y! n! w5 l5 h - if (charSet == null || charSet == "")
6 I. [) E7 L0 l% T - charSet = webCharSet;% J% @ r$ h2 j$ Y/ ]' b
- if (charSet.Length > 0)& ^! [; E6 s, `* c6 |5 Z
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- charSet = charSet.Replace(""", "");
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- C8 O: j8 `& U" Q8 L' x* Y - if (UseUTF8CharSet)
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- if (charSet == null || charSet.Length == 0)$ y% ~/ Y2 \4 i2 ^
- {
8 a5 P( x7 w9 |) f% X - charSet = "utf-8";
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3 s4 f0 ^& s7 `1 i6 I1 i - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default): [* B3 ~, J. m
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);: ~4 A- X, B5 |0 ]1 ^
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1 M1 ~- p/ y, A+ a+ T - catch (Exception)( b3 v9 N- E" o" S& b; |" J
- {
! a1 B$ m" G8 J8 B X' w' z" t - strWebData = "error";* _5 A3 J& Z; Y4 q6 ~) f( I
- }
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- return strWebData;
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复制代码 - J0 K" n- I% ~) G
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