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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:/ e$ a* m" a" e* g
- 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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& D {9 I, P7 t7 x/ f+ a* D4 p& Q - string strWebData = "error"; g; A% c: \' S
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient % H0 r* R1 t* H, }4 ^4 x
- // 需要注意的:
& L7 U" v ^) O: f - //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 8 l3 j2 o+ v% k4 r7 ~# B
- //这是就要具体问题具体分析比如在头部加入cookie
( Y. K) ]7 a/ ~( C& F! h5 X! } - // webclient.Headers.Add("Cookie", cookie); - I" w9 t* |0 v7 J8 @
- //这样可能需要一些重载方法。根据需要写就可以了+ Y( r0 T$ z+ U6 I- u7 ~
- 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)");# f3 y# }$ X% i8 Z
- //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
" c" U/ e5 U0 \% u, k2 [# G$ e( `. M - //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。 5 k, y0 v8 Z) b' k# F
- myWebClient.Credentials = CredentialCache.DefaultCredentials;1 S/ r: T0 k+ e" }" h7 _, K
- //如果服务器要验证用户名,密码 - ~0 K' W' E4 f/ {
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword); ' f( d1 L5 p2 `+ P1 n7 u9 {$ h
- //myWebClient.Credentials = mycred;
' [8 f1 x( l# J/ G2 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 F9 L- R6 _2 j9 ^3 I$ \ - byte[] myDataBuffer = myWebClient.DownloadData(url);
/ {/ x' ^$ i4 ~2 |. n1 t - strWebData = Encoding.Default.GetString(myDataBuffer);
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7 f9 o6 v1 A, g- //获取网页字符编码描述信息 . t* J: _; ]# \5 I) T$ S- N8 c
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
0 g# X) s# Q4 P3 D - string webCharSet = charSetMatch.Groups[2].Value;5 M: C; h/ Z- }4 o1 ]2 V, |) {
- if (charSet == null || charSet == "")
y2 [! c3 \ Y. b, B: I6 I - charSet = webCharSet;
/ @4 I/ R. b) O - if (charSet.Length > 0)
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: p- V# ?* [ W' m - charSet = charSet.Replace(""", "");- m- }/ Z! [: i0 n
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- if (UseUTF8CharSet)
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7 M) r8 P9 U' C% N - if (charSet == null || charSet.Length == 0)
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% @6 U) W4 H9 B0 ?9 r - charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
7 J* C1 k; c) |8 z" Q - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);: w+ U/ J7 ?5 p: G6 [: C. j
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- }
0 L; L8 v7 T& r. ~- M9 S( y$ A/ ~4 q9 P - catch (Exception)
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- N' C0 |1 S; U% G2 I6 d - strWebData = "error";* M2 I- a, R, ~- L% }
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' W: z# Y. z: f0 R0 m; H2 P' I4 p- return strWebData;
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复制代码 ; z; ?! p. w4 g' {& c
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