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发表于 2016-2-26 16:23:12
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1 r7 a5 C8 V; L z0 q/ }% d* \缺少一个gethtml,用下面这个:
* T& V: b5 c. k( y) u- 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 ' W; ^: a; i8 ~2 Y% H
- {
. |" ~9 D) i$ j1 ~$ k - string strWebData = "error";
3 g0 L+ Y) f# P - try
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
% q) k. s0 J# Z7 S9 s' p& \5 E - // 需要注意的: . e, @' \ ^2 ~9 T4 x) R2 H
- //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
* d& {! [4 ~2 a; U- q - //这是就要具体问题具体分析比如在头部加入cookie * J$ ~. N: E7 G( _0 d: e9 C
- // webclient.Headers.Add("Cookie", cookie);
' ~$ @2 h1 N9 A; N2 o - //这样可能需要一些重载方法。根据需要写就可以了
) Q( t% M& j, p8 b S7 n4 \* u6 Y1 P6 N - 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)");2 i3 Q/ g# d# G: I
- //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");5 g- z6 r& I* B9 `" k% _
- //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。
0 ]& I- n! e+ N' x9 Z- _8 R% w; f - myWebClient.Credentials = CredentialCache.DefaultCredentials;, }: {* ]$ N" S
- //如果服务器要验证用户名,密码
' l6 d5 o0 \& R. a A5 s( a - //NetworkCredential mycred = new NetworkCredential(struser, strpassword); , x) \ n: y( L: I7 j- F
- //myWebClient.Credentials = mycred;
, A& ~, w# f x; x - //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) % [+ I" O9 L" \4 E$ y
- byte[] myDataBuffer = myWebClient.DownloadData(url);: U2 g# S8 w, G- z$ Z; X% G1 B
- strWebData = Encoding.Default.GetString(myDataBuffer);$ w, p( V% f. i2 w
; _( Z1 _* x% o2 {: B; d. Z- //获取网页字符编码描述信息 6 p- |$ l0 g5 t& |
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);- G; B$ T3 {3 b9 f( f. v% y
- string webCharSet = charSetMatch.Groups[2].Value;
8 l) r+ u9 t4 V- ` - if (charSet == null || charSet == "")& q) N# T" p7 O1 M" x5 x
- charSet = webCharSet;
& }# { A( ~& m$ U9 {- Q5 _* D8 {2 f4 w; r( E - if (charSet.Length > 0)* }3 ?) d. o* d7 `1 ^4 i: C+ l! f
- {
& B# Q T! G$ Q- K+ K+ v8 A, x - charSet = charSet.Replace(""", "");! k- a0 Q) Z! F
- }! S/ A- r7 D9 C; ?# R8 M8 {$ J
- if (UseUTF8CharSet)
7 ^1 F3 k3 n9 h5 L! v, g - {
( N, b, W+ o3 Y. H6 F# o) B8 Z. Z& M% U - if (charSet == null || charSet.Length == 0)
9 S) W# R8 n, u& D: B. V - {
2 N8 D7 i! z7 @; I - charSet = "utf-8";1 l: _% \4 c, _; h; v; L- X' w b
- }
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)8 r6 l5 ^, m3 a- m H e q# f
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);; _$ z8 v# @; {. l/ [, e
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- }
) `6 o7 ^7 t: h1 y0 y. h. ]7 X. b - catch (Exception)
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- strWebData = "error";9 z$ B$ p& b9 p: e' o0 P
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- return strWebData;0 {* e! P, p& x; T
- }
复制代码 1 o0 F, R5 k1 y5 }3 j* J' j2 d9 P
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