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发表于 2016-2-26 16:23:12
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( C* s5 x0 m' r4 _$ B缺少一个gethtml,用下面这个:
5 ~ S3 q2 j0 O, X( ~- 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 1 i6 w7 r1 R. \) j! T' P: d
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- string strWebData = "error";5 j+ r B/ e' q- p7 c, g- b" r
- try
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient 6 p$ `8 ?5 a. i9 s4 Y
- // 需要注意的: 8 N, P5 O" V( L: l. G6 s
- //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
/ w$ L' ?& D8 j4 r2 v+ b, I* V/ Y( J - //这是就要具体问题具体分析比如在头部加入cookie M" |. \4 R! C# i
- // webclient.Headers.Add("Cookie", cookie); 0 K, T+ z3 Q6 x
- //这样可能需要一些重载方法。根据需要写就可以了7 o" g8 p f# _( z8 P
- 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)");
/ y) ]7 Q- c8 \4 [5 a2 |2 L8 Q - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");; X, S7 M. o. G2 d$ W
- //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。
# v6 Z: o! o6 } - myWebClient.Credentials = CredentialCache.DefaultCredentials;
* D3 D, i0 M6 r - //如果服务器要验证用户名,密码
+ O& s% v7 G% V4 N4 u% m - //NetworkCredential mycred = new NetworkCredential(struser, strpassword); # o! h8 n* ~6 h: f' y6 W- }. T$ X% C
- //myWebClient.Credentials = mycred; & D! R9 `/ W' r' `
- //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)
5 `9 u4 q& D% f8 s1 i$ z) q - byte[] myDataBuffer = myWebClient.DownloadData(url);0 D3 }; ~* d0 C8 o
- strWebData = Encoding.Default.GetString(myDataBuffer);( L: P: o4 q! S2 a5 b7 u: k
5 Q) }. _. |/ k5 G8 ~5 K- //获取网页字符编码描述信息 . g1 s8 W& Z! d2 J7 d
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
: y4 I# `: s; L. X& @- _6 a1 s3 J g - string webCharSet = charSetMatch.Groups[2].Value;6 k0 s0 S3 I6 ]* I/ Z0 _# ~
- if (charSet == null || charSet == "")- _7 u* m& T* ]' u
- charSet = webCharSet;! a D A3 a2 T) \. ~0 U
- if (charSet.Length > 0) S) M$ m6 b' P, @/ ~ r
- {
/ ^! r3 S8 ~4 v8 q( |1 Y - charSet = charSet.Replace(""", "");
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0 V+ S' t1 v. y7 h- q# Q - if (UseUTF8CharSet)$ d9 B2 H0 n% ~2 M
- {# F5 B; F& s4 c. e4 W* k
- if (charSet == null || charSet.Length == 0)
4 u7 F' X. W0 w V o+ ? - {
* e, _4 _* F+ _0 W4 r; _8 m1 u( @ - charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)5 c9 `; n4 k( Z- o G6 q( n2 |; p
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);4 t* |2 T& u6 I$ Y
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- catch (Exception)
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- strWebData = "error";
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- return strWebData;
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复制代码
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