|
|
发表于 2016-2-26 16:23:12
|
显示全部楼层
2 C/ y- H( Q2 E) a1 r% {/ i7 p缺少一个gethtml,用下面这个:
" M+ f0 S$ y' x& R3 l( A- 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 3 [/ e4 m% E* x& F" i
- { A% K* p) |9 P Q
- string strWebData = "error";7 C- u) ^! g' `* N& O5 y2 F
- try
3 L" a- O! {* M. \/ p0 U - {' w& j- J z# G: R/ K( }" ]$ {
- WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient
, i9 O2 g2 X% C2 ~8 A9 z - // 需要注意的:
; _& Y: a/ [8 ~7 `/ G. n, W1 C, x* M - //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 J# X1 ^' H& B* T# I$ s8 K# S
- //这是就要具体问题具体分析比如在头部加入cookie
5 s0 o# d7 X* ]0 a1 ^ - // webclient.Headers.Add("Cookie", cookie);
; R7 a# c" [9 G6 {# e- w - //这样可能需要一些重载方法。根据需要写就可以了
& S5 Y- w' c 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)");
1 W, t! ~8 Q( X - //myWebClient.Headers.Add("User-agent", "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)");
, g$ m: j; a3 l5 \* v- b - //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。 / c0 ~+ _. S: J+ m% \
- myWebClient.Credentials = CredentialCache.DefaultCredentials;& [* M0 G8 f3 L3 N5 N: L& i
- //如果服务器要验证用户名,密码 L+ F# W F# J5 q$ g' F
- //NetworkCredential mycred = new NetworkCredential(struser, strpassword);
' w. p; Q( t6 R1 q) z% I - //myWebClient.Credentials = mycred; * P/ t' Y8 B1 {2 \
- //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) - O A1 O* b; ?4 h8 M
- byte[] myDataBuffer = myWebClient.DownloadData(url);% {* w% q: }. ~% p! Z. x
- strWebData = Encoding.Default.GetString(myDataBuffer);, a) N3 C2 u8 V& m
* G7 t- r2 l) ]8 `0 c0 i& c- //获取网页字符编码描述信息 : h8 j( m( R c0 C
- Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
# v( g) V. r; E6 B! N4 g - string webCharSet = charSetMatch.Groups[2].Value;
$ ]9 n* y2 K5 C5 m3 o3 ? - if (charSet == null || charSet == "")
3 ~3 S# L6 q7 N3 `' K7 X* ?8 O - charSet = webCharSet;
/ q: y, b! g' r3 I2 f - if (charSet.Length > 0)0 o3 y1 T8 s* I4 J
- {- ~# Q6 X) X* g0 ]% I7 L* u7 X8 p
- charSet = charSet.Replace(""", "");
! v& k' x5 f1 p6 _6 v - }
4 w! w3 I2 Y A5 F0 t3 x - if (UseUTF8CharSet)" a; C. G9 b- L9 t: L
- {! g& y" V2 ^! h% H' g% `/ F
- if (charSet == null || charSet.Length == 0)8 Y5 x/ k" |& r% ^8 J+ b
- {
) M5 m8 A. `& i5 s - charSet = "utf-8";
0 S5 o% z- X- C, [" V! E6 c6 i! o - }1 B' n0 l$ J! X& H2 s$ l
- }3 o/ q- W1 z4 E) B# Z
- if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
. b0 D/ W/ u+ h" w4 a4 c/ U - strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
) s" p( S7 E: r/ A; i. V1 z
# R5 C9 w+ s! ^! f- |% f9 h- }5 o. I4 ]. ^( y( ~ o" G
- catch (Exception)
% d, h ^) h1 p( G. o1 e1 ` - {% G# b( P" K' D$ v" v- p& } y( ]
- strWebData = "error"; S; f) B* I4 U3 x( @
- }
. z+ ? A+ E% I; c" T3 H. y8 D9 K% j
! u2 H8 `; I8 N4 h0 d4 G- return strWebData;
3 y* s& Q/ M3 w - }
复制代码 0 D8 c: d" u( [# \2 s
; W) l3 S( M& R8 e0 w5 k2 Z
|
|