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发表于 2016-2-26 16:23:12
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) e6 z+ |" [" g缺少一个gethtml,用下面这个:
% m" C3 a9 ~# @# L3 _: N. \- 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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- string strWebData = "error";
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- {
$ z: U! d! W6 I - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
1 ?. q# L4 s8 L - // 需要注意的: W# c8 |7 g& B' C- F+ j! Q
- //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
( j Z! M% O0 ] - //这是就要具体问题具体分析比如在头部加入cookie
! B4 r. Q ?: R( X) N( e- V - // webclient.Headers.Add("Cookie", cookie); * s5 Y3 @) V; h C
- //这样可能需要一些重载方法。根据需要写就可以了: O0 Q; q b" ?6 k, R/ 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)");
3 u s' c! y1 M: f" H8 t# l - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
; f; I! e% L5 S; y8 j5 J - //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。 " r! P, u( G8 V+ W% n
- myWebClient.Credentials = CredentialCache.DefaultCredentials;
* _, g; w: @( ?# ?- r# e% e - //如果服务器要验证用户名,密码
% c- ?' _4 o r% C* R" T. y) i) Z7 b - //NetworkCredential mycred = new NetworkCredential(struser, strpassword); 6 ?9 r# ~4 o+ p. _
- //myWebClient.Credentials = mycred; 9 |$ L# a. E; _9 H$ {: t
- //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) 3 [; n. }6 V0 ]0 _- X9 s8 f
- byte[] myDataBuffer = myWebClient.DownloadData(url);; U! i, q' S; R
- strWebData = Encoding.Default.GetString(myDataBuffer);$ A+ u4 I; V' |' \9 b# e, p
. P+ G( k/ ?+ l2 B* M- //获取网页字符编码描述信息 $ g ^1 D, u2 V' d. @
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
. t4 V+ I0 i/ }! p2 w0 a' e5 } - string webCharSet = charSetMatch.Groups[2].Value;
! M/ v; ^/ v% Z3 @2 K+ O A - if (charSet == null || charSet == "")
: J& l) B0 _( X+ W% X' H - charSet = webCharSet;
9 n+ P! R3 G S - if (charSet.Length > 0)8 f" z5 N. y$ U. Y/ a, ]
- {
! }7 z9 i' j+ d - charSet = charSet.Replace(""", "");
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- if (UseUTF8CharSet)+ T3 {% g4 E1 H6 ]1 n
- {
/ [1 i1 [ T! ], a+ ]& s - if (charSet == null || charSet.Length == 0)# z6 I! k0 g+ q% D. |6 ~7 ?# O
- {
& g) W5 H/ u- M8 j - charSet = "utf-8";/ u- g9 \4 n' L4 Q
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- }
& |) c% K$ p+ ^' G9 t% `/ W/ O - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)2 i( _7 T. J1 ?1 v9 M3 ?4 H
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);8 c6 `* P( w7 l7 Y
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- catch (Exception)
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- strWebData = "error";5 P; O2 _1 L7 T$ v$ ^" @
- }
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- return strWebData;
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复制代码 " a8 Q/ @" y0 l @( }4 h
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