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发表于 2016-2-26 16:23:12
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: s. p2 v2 k$ n; Q, Y. r缺少一个gethtml,用下面这个:1 j( K8 B! I( r# J9 A; L! R/ 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
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- o; c7 r! }' @- U - string strWebData = "error";
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- {% O4 @0 w$ e& F; t' e
- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient 0 B/ s: g. K1 {; T) N
- // 需要注意的:
6 x$ f6 {# C( w4 ~2 ` - //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 + E$ T5 A% T; ^' ^/ f( k4 j
- //这是就要具体问题具体分析比如在头部加入cookie 5 `; x# e/ u+ n& Q: |
- // webclient.Headers.Add("Cookie", cookie);
+ L" o5 ]' y# ^. {) ]3 }7 I - //这样可能需要一些重载方法。根据需要写就可以了$ i7 b$ J3 y" u/ k4 r0 V0 r. s7 c
- 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)");
: ]) F0 J2 n5 y1 t - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
7 w |0 [9 l# } - //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。
( ?. K( ~4 x" u0 \4 H - myWebClient.Credentials = CredentialCache.DefaultCredentials;$ [7 R( R! t. G
- //如果服务器要验证用户名,密码
' F/ [( A0 c9 w/ n: W - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
6 r2 F* ?9 }( L( I* o3 N; B - //myWebClient.Credentials = mycred;
7 k! n9 h) T" P6 Q# H - //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) & v( [! ~: B% f$ L( F$ R3 w
- byte[] myDataBuffer = myWebClient.DownloadData(url);$ r1 n( v; E# m0 u( ]% Z1 U4 g
- strWebData = Encoding.Default.GetString(myDataBuffer);/ s; P- x4 r, O. N8 \: ~2 a
8 R# [ U0 {1 B. _3 A- //获取网页字符编码描述信息 % K5 I4 ?6 e3 w; q) J. U! m* R1 ]
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);; m0 {9 z: U; M0 z% E% E
- string webCharSet = charSetMatch.Groups[2].Value;$ t; J! i$ L/ c0 N2 I
- if (charSet == null || charSet == "")( F& P$ A/ C# r. k
- charSet = webCharSet;) q' K( V$ [5 X4 ~9 f n
- if (charSet.Length > 0)
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- charSet = charSet.Replace(""", "");
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- if (UseUTF8CharSet)" i4 ]) s- T/ ?2 E$ p5 N
- {% [* }$ C0 y4 H8 c
- if (charSet == null || charSet.Length == 0)
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- charSet = "utf-8";
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/ s6 |% J. H" H: ] - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
/ r3 l# j [, b5 D - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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9 i$ ^! j9 I# _) z# L) I( f - catch (Exception)* [& A# x" S; ]8 P3 Y# G
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- strWebData = "error";. G) W6 P1 O U5 O
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5 R6 X6 U. W/ D- return strWebData;: y4 N2 H& U* F* z4 _9 _* G
- }
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