|
|
发表于 2016-2-26 16:23:12
|
显示全部楼层
- ?) m0 O7 b" B- D
缺少一个gethtml,用下面这个:4 K: s4 Y1 u1 X8 |6 c% H
- 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 , b0 N/ P( C% j! o9 D
- {1 Y7 U) c7 G: g( A, c8 V
- string strWebData = "error";- `# Y1 u! z8 `4 w2 i. G
- try
) o* w# H; P: Q' l8 w - {
) k4 A" t7 c5 Q2 } - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient 8 f6 L/ W" V# C: g3 r' v& C% n
- // 需要注意的: 5 F r, B+ t6 `% I- N$ 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
- ^9 k# Q1 ^; h" U" {% R, i, N - //这是就要具体问题具体分析比如在头部加入cookie
4 f x' U/ w' P - // webclient.Headers.Add("Cookie", cookie);
: |% }) B& f$ l9 W6 V6 x - //这样可能需要一些重载方法。根据需要写就可以了
/ J' |8 c, c. J4 ~! f - 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)");
f7 r' a7 L! u3 V* l G. u7 D( ~! P - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
0 {/ z/ K% k! n - //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。
# z' E. {! X# @2 s6 o" K - myWebClient.Credentials = CredentialCache.DefaultCredentials;5 U" r L. D* J/ A
- //如果服务器要验证用户名,密码
3 i1 J: O4 ~# z% k' M9 q: h! Q - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
4 p1 B/ {2 R# j* j& x! z - //myWebClient.Credentials = mycred; * B5 V" v' g) z {8 f O% U
- //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 |1 w' u3 Y. ]1 U# e; c e: p' D - byte[] myDataBuffer = myWebClient.DownloadData(url);
' M8 _6 u7 } l( O; y, m; M - strWebData = Encoding.Default.GetString(myDataBuffer);
3 m* R" q. G- _9 O! O- _ - + n! q* b% H* \' Y$ V _
- //获取网页字符编码描述信息 0 ]& g3 Z# l8 N4 t2 I) e4 x9 t
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);! t$ G/ \; i z: E2 I" X
- string webCharSet = charSetMatch.Groups[2].Value;/ n9 N0 H0 s T
- if (charSet == null || charSet == "")
% ?$ o5 D! w: `6 E# n, Y - charSet = webCharSet;
5 q8 m' B( C" V$ o" y0 N - if (charSet.Length > 0)
0 X* H) x' f* u, @ - {
3 l3 h( F& T! @ - charSet = charSet.Replace(""", "");+ _% u8 L: g9 A, _# e
- }$ J( F0 g, P$ y" ]* w2 C
- if (UseUTF8CharSet). | ]3 B2 c2 `/ _2 t! s
- {
P. c4 i d7 J! U - if (charSet == null || charSet.Length == 0)
$ q6 U, n) q! y( D* B1 ^6 n - {+ x8 R% ]- [/ L9 Q4 O$ \+ C
- charSet = "utf-8";5 y* c( v; L# j% ], R( a
- }
, u1 v6 ~1 F* P' g - }& b% x& l! |3 _4 t; @* B7 |
- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)) y+ n2 H2 W7 ?: F, i Z
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);+ E$ R3 o1 \% f+ K
- 1 G2 |$ ]* J, K1 Q y
- }
! m) u6 x8 G( H - catch (Exception)
; u& J1 i6 J; p0 s8 y( }" f; Q1 T - {& X9 K% f% E& d7 j& i6 h
- strWebData = "error";" F) n' x# J4 Q7 ?0 i
- }8 _% }$ m4 t/ E% A q7 U
6 K8 O' M- B9 j1 }7 q& `8 {4 d, w- return strWebData;
! z# T9 i @) d5 Y$ T - }
复制代码
. c3 Q+ Z; K6 P* P9 c/ {
- k1 c" F6 N" ?8 ]/ N9 H6 [ |
|