日期:2014-05-18  浏览次数:21068 次

中国银行外汇牌价抓取代码不再起作用了吗?
我的代码是ASP.NET的,于2008年12月13日突然失效,不知为什么。
抓取到的html代码只有<head>部分。请高手指点!
代码如下:
string html = "";

try
{
DataSet1.WaiHuiDataTable whDT = new DataSet1.WaiHuiDataTable();
string url = "http://www.boc.cn/cn/common/whpj.html";
html = new MyResponse(url).Html;
string pattern = "<td width=\"86\" align=\"center\" valign=\"middle\" bgcolor=\"#FFFFFF\" class=\'nav\'>(.*?)</td>";
MatchCollection matches = Regex.Matches(html, pattern, RegexOptions.IgnoreCase);
string strResult;
i=matches.Count;
strResult = matches[18].Result("$1");
whDT.AddWaiHuiRow("美元", decimal.Parse(strResult) / 100, DateTime.Now);
strResult = matches[90].Result("$1");
whDT.AddWaiHuiRow("欧元", decimal.Parse(strResult) / 100, DateTime.Now);
return whDT;
}
catch (Exception ex)
{
return null;
}

问题补充:MyResponse.cs代码:
Public class MyResponse
{
...
public MyResponse(string url)
{
GetHtmlCode(url);
}

private void GetHtmlCode(string url)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
DateTime begin = DateTime.Now;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

result = response.StatusDescription;
lastModified = response.LastModified;
characterSet = response.CharacterSet;
size = response.ContentLength;

Stream stream = response.GetResponseStream();
DateTime end = DateTime.Now;
cost = end - begin;
StreamReader streamReader = new StreamReader(stream, Encoding.Default);
html = streamReader.ReadToEnd();
stream.Close();
streamReader.Close();
}
...
}

------解决方案--------------------
我用你的GetHtmlCode代码是可以拿到的~~

你的正则貌似有问题

string pattern = " <td width=\"86\" align=\"center\" valign=\"middle\" bgcolor=\"#FFFFFF\" class=\'nav\'>(.*?) </td>"; 

---》
string pattern = " <td width=\"86\" align=\"center\" valign=\"middle\" bgcolor=\"#FFFFFF\" class=\'nav\'>(.*?)</td>"; 

多了一个空格

另外你的Encoding.Default应该改成人家网站的编码吧~~~

------解决方案--------------------
不明白 
up下
------解决方案--------------------
外汇 换网址了
------解决方案--------------------
前两天 我的也抓不下来
一看 它换网址了 

------解决方案--------------------
探讨
外汇 换网址了

------解决方案--------------------
up
------解决方案--------------------
C# code

protected void Page_Load(object sender, EventArgs e)
        {
            string url = "http://www.boc.cn/cn/common/whpj.html";
            string encodeType = "gb2312";
            string err = "";
         
            Response.Write(WebClinetPost(url, postData2, encodeType, out err));
        }
static string WebClinetPost(string url, string postData, string encodeType, out string err)
        {
            string uriString = url;
            byte[] byteArray;
            byte[] responseArray;            
            Encoding encoding = Encoding.GetEncoding(encodeType);
            try
            {
                WebClient myWebClient = new WebClient();
                WebHeaderCollection myWebHeaderCollection;
                myWebClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");                
                myWebHeaderCollection = myWeb