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发表于 2016-2-26 16:23:12
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1 r0 W0 y( b" H) A) L% n8 H9 h$ x缺少一个gethtml,用下面这个:/ r" t0 Z8 C7 l: o, A9 c+ C
- 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 I7 I& {0 K T/ d7 R$ Y6 y
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- string strWebData = "error";
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6 {- Z; e E( t - WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient 6 k# r. P% D7 `9 }8 v9 Q
- // 需要注意的:
s: ~1 h' X% u, k* C- l0 K - //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 f- I" p* H- \ J! w- `( h& }& e
- //这是就要具体问题具体分析比如在头部加入cookie ( \3 }/ X: T0 F) t9 J
- // webclient.Headers.Add("Cookie", cookie);
+ E: s. i$ b: w/ H - //这样可能需要一些重载方法。根据需要写就可以了 o. a0 W& k/ P8 h) s6 l3 U
- 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)");6 `) K* T1 I# q9 P& Z
- //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");0 A/ |# W' j# y" X! o y
- //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。
- e9 r0 _7 I# u/ C" }: ]- M/ b8 P$ N - myWebClient.Credentials = CredentialCache.DefaultCredentials;
/ o$ h- k7 X* w' \7 f0 n3 l' M8 T# ? - //如果服务器要验证用户名,密码
) x, B0 X! j5 R - //NetworkCredential mycred = new NetworkCredential(struser, strpassword); 9 c% O5 E' y# \' y8 r
- //myWebClient.Credentials = mycred; / o, t$ x) P7 J. [( J3 @
- //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) 2 H/ t. V7 P: X8 p G
- byte[] myDataBuffer = myWebClient.DownloadData(url);6 R# F0 b8 b* G8 I& J* u1 C8 h
- strWebData = Encoding.Default.GetString(myDataBuffer);; k+ f Q5 W. p' m
! G$ \( W: }( T- //获取网页字符编码描述信息 + i5 S$ M2 t* o( c
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);' k/ e) J/ `% T. R1 ^) o9 E" ~0 r, z
- string webCharSet = charSetMatch.Groups[2].Value;
: |2 a* d7 ]8 t. s" J, g( d - if (charSet == null || charSet == "")
3 x+ P2 C5 ]1 e; y3 ^6 k - charSet = webCharSet;
( [& l9 M* S5 f0 D - if (charSet.Length > 0)( G7 h- z' L7 [ W7 ~* [2 u
- {
7 S) v) z+ w* i6 d) w2 t! H - charSet = charSet.Replace(""", "");
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- if (UseUTF8CharSet)
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. k; B) S) Y- \/ w - if (charSet == null || charSet.Length == 0)* A; I& h9 Z( w4 x
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- charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)- e' l. Q$ w1 P. J G3 W
- strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- catch (Exception) H1 G1 |9 n% m# Z) |
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- strWebData = "error";
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- return strWebData;
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复制代码
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