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发表于 2016-2-26 16:23:12
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- Y5 D0 \0 e1 i( d缺少一个gethtml,用下面这个:4 E# ?% ^$ G" v) l6 i- ~! y
- 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 ; n, N- I$ x% X/ I0 O& _
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- string strWebData = "error";& z; y6 ]6 N# ]% o; T3 S7 S9 `8 o
- try
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8 Z8 t; x7 I) G$ H3 s - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
; b9 Y, l9 q; _; e - // 需要注意的: ! m2 L# C: {0 q3 |) Z
- //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
" t% U# v0 K" g2 ? - //这是就要具体问题具体分析比如在头部加入cookie
" C0 G: m: K5 [ - // webclient.Headers.Add("Cookie", cookie);
& d; n+ K; E7 P" \( K8 g - //这样可能需要一些重载方法。根据需要写就可以了# A. V+ f) y- H& C8 u4 T" c
- 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)");
4 i9 A6 a6 m6 ]$ X9 J) Z - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");$ Z" t& `' c$ P2 I; 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。 6 M& N, {: R& |. \9 W
- myWebClient.Credentials = CredentialCache.DefaultCredentials;; q; S1 u. P" s& i. B
- //如果服务器要验证用户名,密码
& Z* c! ^1 ^& z" [4 a4 u Z6 i- V: A - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
% Q2 `# B6 i6 `3 h: c - //myWebClient.Credentials = mycred;
8 j2 N8 j& U& Y0 ?" X- D - //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)
1 T$ ?8 ^0 ?8 h; {: a - byte[] myDataBuffer = myWebClient.DownloadData(url);
( n5 \7 X8 l7 k9 U) r - strWebData = Encoding.Default.GetString(myDataBuffer);
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- //获取网页字符编码描述信息
! b! F7 S/ {# R# y+ ] - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);& @- l, V+ }1 |0 z. e) Y9 @
- string webCharSet = charSetMatch.Groups[2].Value;' ?9 H* ~ {, v9 u. a
- if (charSet == null || charSet == "")- u& o' _# R' l5 A) z0 v
- charSet = webCharSet;' D M4 T p* T
- if (charSet.Length > 0). ]# g& Q2 Z+ i% w7 \3 R
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- charSet = charSet.Replace(""", ""); E# B9 j1 c1 A% O% q1 K& e
- }
& ?/ t' p- C! s+ l% ] - if (UseUTF8CharSet)/ D; |0 [6 H ~$ _; |0 O6 w% z
- {
' X" H8 G/ a* `% A# h - if (charSet == null || charSet.Length == 0)2 ^& B+ _! @8 s
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- charSet = "utf-8";
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, [9 c, A3 P) `! S' {" r - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)4 k1 s% i1 j1 O9 \9 P0 r( Y
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- catch (Exception)8 }% ^7 h' q: ]! X6 U0 f; d$ k' H
- {
& R0 D" d5 g, u - strWebData = "error";
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$ o0 Q: I& O4 \- return strWebData;4 L5 m j1 V! a- Q6 o
- }
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