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发表于 2016-2-26 16:23:12
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( G' {5 C8 {/ U9 b7 R* X1 i& x; t7 x缺少一个gethtml,用下面这个:
3 _$ A: Q+ U+ X* f6 S- 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 9 y4 I ` S5 Y! r P
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- string strWebData = "error";+ l% A+ p% m! k$ K* T' i7 B$ c
- try
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient % V/ F$ C# {1 q8 s& U
- // 需要注意的: * I j# U, Q9 R
- //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
3 W d- O. W4 D6 U - //这是就要具体问题具体分析比如在头部加入cookie
6 a% e3 N( R+ O( ~* s0 x$ G - // webclient.Headers.Add("Cookie", cookie); ( G3 ]; J4 ~8 a4 ^/ ` g- t0 P5 a
- //这样可能需要一些重载方法。根据需要写就可以了# M$ T3 r; @$ e2 \4 o4 y0 Y
- 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)");
/ r6 Y0 @9 U W; O+ z- Q. X - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
6 N3 u8 `- ?- U- D - //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。 ! F5 ?/ x8 ]& G, L) P
- myWebClient.Credentials = CredentialCache.DefaultCredentials;. e- I% o7 _: n* Q1 [3 C
- //如果服务器要验证用户名,密码
- q+ u& A7 x3 u4 T, w+ L - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
; A, \, `& ^/ w/ X+ `1 C2 v- s. e - //myWebClient.Credentials = mycred; 8 l _$ L: g0 }8 V! g
- //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)
. F# H% b( J. ]8 g - byte[] myDataBuffer = myWebClient.DownloadData(url);
) p, o- b5 ^4 Y+ A2 Q- J - strWebData = Encoding.Default.GetString(myDataBuffer);3 I+ i- r j4 _5 q) S
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- //获取网页字符编码描述信息
/ o6 C: W, Y0 _# |3 p4 m - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);1 a d4 S4 }2 X
- string webCharSet = charSetMatch.Groups[2].Value;, j: L& ]" K6 k& n; W9 {
- if (charSet == null || charSet == "")
( b# A* T6 g8 n2 w) T8 u - charSet = webCharSet;, N# Y! h' M6 F8 |4 {$ p
- if (charSet.Length > 0)
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- charSet = charSet.Replace(""", "");: i( f1 v( A, J: |! x0 J
- }( l8 n2 w! _4 M' T5 K
- if (UseUTF8CharSet)
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- if (charSet == null || charSet.Length == 0)
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- charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
" E: P& r# E- ` @ - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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3 B; Y1 p7 V) K( y% X - catch (Exception)
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# J5 C F; z& ^3 K' P - strWebData = "error";
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- return strWebData;8 e7 B0 R/ l4 p* v9 {* e0 U- r
- }
复制代码 - O2 o3 [# \, f% Y% I$ Q
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