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发表于 2016-2-26 16:23:12
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% s2 Y1 k% B) i. K9 ?6 V缺少一个gethtml,用下面这个:
' A/ I; z6 u& I, o: _- 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";7 o& `2 _0 C: T' J! K
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient ) L7 e% Y1 Q$ O/ B: v$ ~8 A
- // 需要注意的:
) w7 o4 u$ t' m3 z N - //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 5 x. M0 N& R0 W3 u/ G) o4 a
- //这是就要具体问题具体分析比如在头部加入cookie
6 Z* I9 R% i+ B. q$ @ - // webclient.Headers.Add("Cookie", cookie);
7 t: P' L5 C" K( e- c - //这样可能需要一些重载方法。根据需要写就可以了; R5 ]! j+ N1 |+ G. k
- 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)");
! N" M, [- }: s) f - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
5 ]( N8 _& Q, w; [$ j9 z - //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% }# Q9 ~ - myWebClient.Credentials = CredentialCache.DefaultCredentials;* T% {7 E6 |: n. u& P
- //如果服务器要验证用户名,密码
, G5 e" }! \0 ^( Y/ h - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
" Y3 T$ n; J( D! u( F- k" Q" y# b - //myWebClient.Credentials = mycred;
( _! R9 [: h& x& Y R$ Q - //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 J8 [, [8 l V
- byte[] myDataBuffer = myWebClient.DownloadData(url);
/ d5 {& v! E4 T9 O7 F - strWebData = Encoding.Default.GetString(myDataBuffer);
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$ s) B, ?. z% ^3 L- x& ?# ^- //获取网页字符编码描述信息
* m1 ~5 ~8 k! L - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);% j# A2 ]3 V/ l* b* I, Z. j
- string webCharSet = charSetMatch.Groups[2].Value;
9 w: E( I: Q8 O0 A Y* p6 R - if (charSet == null || charSet == "")
: e. Y7 D% K6 M! x& `( X - charSet = webCharSet;
0 V) K2 W/ m" z7 }! U! l3 | - if (charSet.Length > 0)
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- charSet = charSet.Replace(""", "");
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, U9 D4 m% s' \5 v5 V- i- Q - if (UseUTF8CharSet)
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5 v# V7 y: q; v- f8 { - if (charSet == null || charSet.Length == 0)9 G2 l: r* m) A- n
- {- [. Q! e, E) U! m) T
- charSet = "utf-8";) G- k% u6 [. ^
- }
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
0 ~; M: @0 q# l) G. |0 B# W; | - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- catch (Exception)" W( H$ Z+ a, `" x
- {
2 U" A" Z& k5 `" v1 w - strWebData = "error";' a, U; r8 \3 m: E. v& {
- }
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; q. }( _8 e3 O+ N N0 K- return strWebData;/ l/ w: q( g( b. q/ M- [
- }
复制代码
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