公司编辑妹子需要爬取网页内容，叫我帮忙做了一简单的爬取工具
这是爬取网页内容，像是这对大家来说都是不难得，但是在这里有一些小改动，代码献上，大家参考
private string GetHttpWebRequest(string url)
{
HttpWebResponse result;
string strHTML = string.Empty;
try
{
Uri uri = new Uri(url);
WebRequest webReq = WebRequest.Create(uri);
WebResponse webRes = webReq.GetResponse();
HttpWebRequest myReq = (HttpWebRequest)webReq;
myReq.UserAgent = "User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705";
myReq.Accept = "*/*";
myReq.KeepAlive = true;
myReq.Headers.Add("Accept-Language", "zh-cn,en-us;q=0.5");
result = (HttpWebResponse)myReq.GetResponse();
Stream receviceStream = result.GetResponseStream();
StreamReader readerOfStream = new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8"));
strHTML = readerOfStream.ReadToEnd();
readerOfStream.Close();
receviceStream.Close();
result.Close();
}
catch
{
Uri uri = new Uri(url);
WebRequest webReq = WebRequest.Create(uri);
HttpWebRequest myReq = (HttpWebRequest)webReq;
myReq.UserAgent = "User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705";
myReq.Accept = "*/*";
myReq.KeepAlive = true;
myReq.Headers.Add("Accept-Language", "zh-cn,en-us;q=0.5");
//result = (HttpWebResponse)myReq.GetResponse();
try
{
result = (HttpWebResponse)myReq.GetResponse();
}
catch (WebException ex)
{
result = (HttpWebResponse)ex.Response;
}
Stream receviceStream = result.GetResponseStream();
StreamReader readerOfStream = new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("gb2312"));
strHTML = readerOfStream.ReadToEnd();
readerOfStream.Close();
receviceStream.Close();
result.Close();
}
return strHTML;
}
这是根据url爬取网页远吗，有一些小改动，很多网页有不同的编码格式，甚至有些网站做了反爬取的防范，这个方法经过能够改动也能爬去
以下是爬取网页所有的网址链接
/// <summary>
/// 提取HTML代码中的网址
/// </summary>
/// <param name="htmlCode"></param>
/// <returns></returns>
private static List<string> GetHyperLinks(string htmlCode, string url)
{
ArrayList al = new ArrayList();
bool IsGenxin = false;
StringBuilder weburlSB = new StringBuilder();//SQL
StringBuilder linkSb = new StringBuilder();//展示数据
List<string> Weburllistzx = new List<string>();//新增
List<string> Weburllist = new List<string>();//旧的
string ProductionContent = htmlCode;
Regex reg = new Regex(@"http(s)?://([w-]+.)+[w-]+/?");
string wangzhanyuming = reg.Match(url, 0).Value;
MatchCollection mc = Regex.Matches(ProductionContent.Replace("href="/", "href="" + wangzhanyuming).Replace("href='/", "href='" + wangzhanyuming).Replace("href=/", "href=" + wangzhanyuming).Replace("href="./", "href="" + wangzhanyuming), @"<[aA][^>]* href=[^>]*>", RegexOptions.Singleline);
int Index = 1;
foreach (Match m in mc)
{
MatchCollection mc1 = Regex.Matches(m.Value, @"[a-zA-z]+://[^s]*", RegexOptions.Singleline);
if (mc1.Count > 0)
{
foreach (Match m1 in mc1)
{
string linkurlstr = string.Empty;
linkurlstr = m1.Value.Replace(""", "").Replace("'", "").Replace(">", "").Replace(";", "");
weburlSB.Append("$-$");
weburlSB.Append(linkurlstr);
weburlSB.Append("$_$");
if (!Weburllist.Contains(linkurlstr) && !Weburllistzx.Contains(linkurlstr))
{
IsGenxin = true;
Weburllistzx.Add(linkurlstr);
linkSb.AppendFormat("{0}<br/>", linkurlstr);
}
}
}
else
{
if (m.Value.IndexOf("javascript") == -1)
{
string amstr = string.Empty;
string wangzhanxiangduilujin = string.Empty;
wangzhanxiangduilujin = url.Substring(0, url.LastIndexOf("/") + 1);
amstr = m.Value.Replace("href="", "href="" + wangzhanxiangduilujin).Replace("href='", "href='" + wangzhanxiangduilujin);
MatchCollection mc11 = Regex.Matches(amstr, @"[a-zA-z]+://[^s]*", RegexOptions.Singleline);
foreach (Match m1 in mc11)
{
string linkurlstr = string.Empty;
linkurlstr = m1.Value.Replace(""", "").Replace("'", "").Replace(">", "").Replace(";", "");
weburlSB.Append("$-$");
weburlSB.Append(linkurlstr);
weburlSB.Append("$_$");
if (!Weburllist.Contains(linkurlstr) && !Weburllistzx.Contains(linkurlstr))
{
IsGenxin = true;
Weburllistzx.Add(linkurlstr);
linkSb.AppendFormat("{0}<br/>", linkurlstr);
}
}
}
}
Index++;
}
return Weburllistzx;
}
