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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:
' t! z1 N/ f2 [, C) k- 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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) {, S) K7 @/ O5 T: i - string strWebData = "error";
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- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient ( ~1 N7 }1 v0 w( d9 y
- // 需要注意的: % K4 D! X9 [1 q t' \& P
- //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 1 O4 V5 u. l8 m: i( m+ ~ P6 D# @
- //这是就要具体问题具体分析比如在头部加入cookie
1 T3 s, i8 s1 B5 \4 X3 ^: m3 K/ _ a - // webclient.Headers.Add("Cookie", cookie);
5 Z7 ~7 I9 N0 o! p - //这样可能需要一些重载方法。根据需要写就可以了5 c! H$ O4 V! z1 b. P& 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)");8 m) `/ D( R$ \9 _4 W' J
- //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
$ }# y6 |/ {( [ - //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。 / R2 ?4 ] ^# Q' w( m( V* O
- myWebClient.Credentials = CredentialCache.DefaultCredentials;3 K, f7 r, c. C' @* `% T1 X
- //如果服务器要验证用户名,密码
4 j: p) n1 V8 F- u+ Z - //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
/ D! V# h5 j6 u4 v& O+ s$ d" [ - //myWebClient.Credentials = mycred;
! ^! {" i+ X- t' O3 Y- ]1 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)
0 y4 O) b. ^* S* g2 m1 Y - byte[] myDataBuffer = myWebClient.DownloadData(url);; r0 @& Y4 d- r3 G7 g; E9 Q( b
- strWebData = Encoding.Default.GetString(myDataBuffer);
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- //获取网页字符编码描述信息
1 Q8 F1 t% ^ Q2 B, \3 L - Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
& y% ]3 V6 Y. f+ r - string webCharSet = charSetMatch.Groups[2].Value;. m* M$ s- U; r; E* [$ g
- if (charSet == null || charSet == "")" M/ A0 c* k0 t1 z; e
- charSet = webCharSet;! Y; x3 ~& m; }) C, p& d
- if (charSet.Length > 0)7 |" B& J- l9 T/ T- h
- {
) S$ X# h, }) [' Q - charSet = charSet.Replace(""", "");
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- if (UseUTF8CharSet)( }/ Q3 v$ b# O
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- if (charSet == null || charSet.Length == 0); e; b8 f. W6 G4 t" j# y
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- charSet = "utf-8";
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- }
* S, Q" F% B7 D6 D' i9 F - if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
2 v6 T: f0 H9 p) {( a+ B - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);8 R4 q% N, X( W& _
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( [4 ?. r2 U, o2 J4 @& ` - catch (Exception). R! \8 H5 `! D5 l* i
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- strWebData = "error";
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& \- \) a9 z- m/ [) H* G- return strWebData;
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复制代码
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