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发表于 2016-2-26 16:23:12
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! V7 ]6 l/ X2 ~, P缺少一个gethtml,用下面这个:
# X: ^( z9 r/ w1 f/ G, o" i7 \4 z- 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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- {
7 l1 s# s2 M8 d v! t* @ - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
; K+ `! `0 z' g$ |3 n- h) F# u- V" t - // 需要注意的:
5 c/ f; r0 t9 u" g - //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 7 I9 T) m; n5 M' s; S9 J
- //这是就要具体问题具体分析比如在头部加入cookie
# @5 s& K5 z9 Y) Z$ X/ ` - // webclient.Headers.Add("Cookie", cookie);
- w. R! x2 f! H/ I0 S0 v: n4 b - //这样可能需要一些重载方法。根据需要写就可以了
% n/ Z4 O9 g; P3 w - 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)");
! z4 B* V# `0 h - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");* c1 y: |1 M0 a4 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。
8 _6 w$ C& N4 i G3 z, E - myWebClient.Credentials = CredentialCache.DefaultCredentials;2 o5 Z2 Q0 `7 J4 M
- //如果服务器要验证用户名,密码 # r( Y, Z1 ^# L0 I8 K1 G
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword); ; D1 z* I4 j Q/ M2 {- q) ~9 r) x
- //myWebClient.Credentials = mycred;
% G' H; t; o) x5 K4 B8 G* |7 _ - //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 B" s% C& b# c
- byte[] myDataBuffer = myWebClient.DownloadData(url);
6 g2 S1 E9 v! Y2 p" j - strWebData = Encoding.Default.GetString(myDataBuffer);
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- //获取网页字符编码描述信息 ; F2 X- e/ d: q8 I% B( c0 Z- `& }
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);5 s$ C* J0 k) y. `% ]8 Z7 g
- string webCharSet = charSetMatch.Groups[2].Value;
6 k# o: {; g0 Z- ? - if (charSet == null || charSet == "")
* x) x' R7 \( b: L. z - charSet = webCharSet;
J# s$ O8 v* m( i - if (charSet.Length > 0)
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- charSet = charSet.Replace(""", "");/ o, k2 h! ]' |8 f ]$ g2 v
- }
. p% e; q/ y! d; s* q5 t7 [' F - if (UseUTF8CharSet)" U0 R, D2 j$ Z ?5 Z! ~
- {
8 r8 z: Y9 f+ u - if (charSet == null || charSet.Length == 0)# j8 v+ i+ l" i6 C
- {
# M+ e0 c; K1 C - charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)8 e: F* _3 D# p9 u% E- n9 g
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);, r2 ]5 G0 @. j
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- catch (Exception)
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0 F. y0 X! M3 F; O W: n( { - strWebData = "error";
* Z8 l4 |8 U$ S2 k - }
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- return strWebData;
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