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发表于 2016-2-26 16:23:12
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缺少一个gethtml,用下面这个:- S5 |' d* N# y$ R, u/ m
- 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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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
6 {$ z& v4 j+ \5 C - // 需要注意的:
+ z6 |1 }! Z4 i - //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
2 x: y% L2 J1 k - //这是就要具体问题具体分析比如在头部加入cookie 4 s4 {1 i9 d$ N: x
- // webclient.Headers.Add("Cookie", cookie); ) S6 X: @* }/ P. p6 K
- //这样可能需要一些重载方法。根据需要写就可以了' a! A+ f0 X0 @% V! S) c; ^- G! ]8 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)");
+ p2 u3 `& i( }2 Q" ^6 R/ f5 ` - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");- Z: R0 i7 h' M$ ^1 Z2 O5 n
- //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。
) I" y- `. ^2 @2 N - myWebClient.Credentials = CredentialCache.DefaultCredentials;
1 o- i' ]7 i2 U5 t! B, P3 `4 C - //如果服务器要验证用户名,密码
# R. E4 P% J% c* U# r; Q j5 w - //NetworkCredential mycred = new NetworkCredential(struser, strpassword); 0 C+ J5 m. Y# r4 }: T
- //myWebClient.Credentials = mycred;
7 @1 u- ]& x' j/ T( i% t- V - //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 y$ Y6 f5 Z+ v- @# \
- byte[] myDataBuffer = myWebClient.DownloadData(url);
/ ]( {/ k/ c0 [: C - strWebData = Encoding.Default.GetString(myDataBuffer);, x9 d2 k& v0 H3 P: ^ g5 d
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- //获取网页字符编码描述信息 - e ~ L% E4 _9 J' X% V: b
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline); u! q& x! B( i& V: X
- string webCharSet = charSetMatch.Groups[2].Value;
# l- |) N( H1 X+ F! a0 Y b V - if (charSet == null || charSet == ""), `7 C' A) u$ ] k3 f$ n
- charSet = webCharSet;8 W. o/ i& _1 d& B- ` ^
- if (charSet.Length > 0)! b& c8 h" j8 q0 ~2 l
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- charSet = charSet.Replace(""", "");# O) n$ W8 V0 ~
- }
2 L0 L" {+ G+ c4 r8 Y4 | - if (UseUTF8CharSet)
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- if (charSet == null || charSet.Length == 0)
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, r7 I6 F& L7 f+ r$ b! z } - charSet = "utf-8";
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- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
2 T& G; J+ J, n- D* @3 r+ r - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
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- strWebData = "error";& w4 @4 o" Z7 S! t
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! a- s t; h+ N. E( ]2 \" ~: Q- return strWebData;3 f6 ?( X8 e1 J- r- D
- }
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