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发表于 2016-2-26 16:23:12
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& p( u9 }- n% K8 y2 O) D缺少一个gethtml,用下面这个:8 `4 q9 Z3 A: H% R8 R
- 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
# L) U# |( U% W+ B2 Z - {
' p' w7 q3 H: S - string strWebData = "error";
% }8 S* } N+ ~" p1 J6 T, z, s - try
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, r1 O2 u2 i/ I - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient 1 L# y( W! ]7 I! i i/ e
- // 需要注意的: 7 t+ Q; @; J6 G( A+ j, E7 [
- //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
1 r, N4 K* y6 {6 f - //这是就要具体问题具体分析比如在头部加入cookie . q, o2 X$ Z& E% L8 Z2 }0 m
- // webclient.Headers.Add("Cookie", cookie);
. X( H: U- X T- ~& v$ } - //这样可能需要一些重载方法。根据需要写就可以了
" K' X& j& ^3 E8 K8 g8 c7 D - 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)");* N& o. G5 r7 Q8 l
- //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");8 Q; f$ N" e9 l4 J/ w5 P
- //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。
9 q! w% A* v. K/ n - myWebClient.Credentials = CredentialCache.DefaultCredentials;5 P1 ?& \+ S0 Y- ~' f' ~' M
- //如果服务器要验证用户名,密码
0 Y9 ]' x8 y0 |* U6 }* {6 ~ - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
# o% o0 k5 ^* a# [1 Y6 a - //myWebClient.Credentials = mycred; 3 v$ q9 |) D, o" R2 g( T% 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) 9 \4 n8 }2 h8 t, t
- byte[] myDataBuffer = myWebClient.DownloadData(url); z* V5 A3 l) [
- strWebData = Encoding.Default.GetString(myDataBuffer);' G4 Y& Q; p2 f7 B: S4 A
, _/ Z7 P0 h. {; ~- //获取网页字符编码描述信息
: m; O" H1 i3 u% b& i - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);' |8 |$ c9 V7 A# x! l
- string webCharSet = charSetMatch.Groups[2].Value;8 p7 [+ Z N8 f; l- ?
- if (charSet == null || charSet == "")$ Y7 W# f* B" y; `( @
- charSet = webCharSet;$ O4 p9 {8 G, J: [ E
- if (charSet.Length > 0)
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& ~9 F7 s+ X; }# j( C- I - charSet = charSet.Replace(""", "");. q" h: p# @3 N1 B
- }
4 |8 l \# H$ N& s- A - if (UseUTF8CharSet)
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- if (charSet == null || charSet.Length == 0)" i" A/ v- J% ?/ p
- {
9 |. ]9 _; _- I: z - charSet = "utf-8";
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- }
, T. o1 d5 m# D ]; {% l - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
8 u7 y# G- @: S* m - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- }
4 ?& {8 X+ ]8 R4 B# b$ a, Z - catch (Exception)
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- strWebData = "error";3 r6 F3 I+ ?/ C- y0 b4 d
- }
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- return strWebData;
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