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发表于 2016-2-26 16:23:12
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& r6 T$ p. M7 d% {: ^" X8 Y缺少一个gethtml,用下面这个:3 w+ H: B+ O& E5 T8 a' M
- 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";4 K% e$ {/ F# n8 G- K
- try
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0 C8 ]. a7 T( v! Y% c - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient ! t l& ]+ M8 d5 j- P: f1 T8 Y
- // 需要注意的: - I& S% {$ [- w6 z/ V
- //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
) G1 m) t: u% P+ z% ~ - //这是就要具体问题具体分析比如在头部加入cookie . {0 d8 X# @. C5 Z f
- // webclient.Headers.Add("Cookie", cookie); 3 c9 o D5 X* f6 T6 W
- //这样可能需要一些重载方法。根据需要写就可以了
. T, f$ r+ V' R - 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 c. o) I8 T2 ?7 ?7 L - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
3 d& R6 P: j- f3 d8 A' Q - //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。
! ]1 w( v" \3 A: C$ D3 t% V - myWebClient.Credentials = CredentialCache.DefaultCredentials;
7 I0 o$ W7 D0 o( s# v( } - //如果服务器要验证用户名,密码 5 Y9 p& z$ w- O3 M
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
" E1 ]' H% b- Z! q) U - //myWebClient.Credentials = mycred;
( q3 C, Q ~. 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) 7 a2 }! x: ]8 T9 u/ d, @2 I' {
- byte[] myDataBuffer = myWebClient.DownloadData(url);
- X- k- P7 Z9 U: a3 R - strWebData = Encoding.Default.GetString(myDataBuffer);
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# _/ }' ^) h l, \ U# J, e- //获取网页字符编码描述信息 ) m, D: T: W( \
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
' O& o& B4 V* [% z2 x! O5 c - string webCharSet = charSetMatch.Groups[2].Value;. v8 P1 q3 _& d6 w) \ `3 o
- if (charSet == null || charSet == "")
; j: R% ?; F4 ?. |* c1 {- I L - charSet = webCharSet;
5 d+ |( Y H8 N* w" z& R - if (charSet.Length > 0)& M" K8 E, P1 {/ Y1 w( }
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- charSet = charSet.Replace(""", "");
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/ |! P# {, I4 C! V* T0 W) c4 O* | - if (UseUTF8CharSet)
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- if (charSet == null || charSet.Length == 0)
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- charSet = "utf-8";1 e; R' M' d1 u6 w# Z8 M
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)* y ?2 B+ K0 S& ~: o/ i, ]$ H& A; x/ a
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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$ t0 \! v% f! a/ m( R - catch (Exception)
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8 i |2 j0 \, r/ s - strWebData = "error";- ]1 j' w# [6 n1 m
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- return strWebData;
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复制代码 1 V/ ^+ {7 z1 a: l, E2 b/ E' e
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