//提取產品列表頁中產品最終頁的網頁 
private void button1_Click(object sender, EventArgs e) 
{ 
if (textBox1.Text.Trim() == "" || textBox2.Text.Trim() == "") 
{ 
MessageBox.Show("網址和域名不能為空！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information); 
return; 
} 
try 
{ 
string Html = inc.GetHtml("http://study.pctoday.net.cn"); 
//ArrayList al = inc.GetMatchesStr(Html, "<a[^>]*?>.*?</a>"); 
ArrayList al = inc.GetMatchesStr(Html, @"href\s*=\s*(?:[\'\""\s](?<1>[^\""\']*)[\'\""])");//提取鏈接 


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StringBuilder sb = new StringBuilder(); 
foreach (object var in al) 
{ 
string a = var.ToString().Replace("\"", "").Replace("'", ""); 
a = Regex.Replace(a, "href=", "", RegexOptions.IgnoreCase | RegexOptions.Multiline); 
if (a.StartsWith("/")) 
a = textBox2.Text.Trim() + a; 
if (!a.StartsWith("http://")) 
a = "http://" + a; 
sb.Append(a + "\r\n"); 
} 
textBox5.Text = sb.ToString();//把提取到網址輸出到一個textBox，每個鏈接占一行 



MessageBox.Show("共提取" + al.Count.ToString() + "個鏈接", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information); 

} 
catch (Exception err) 
{ 
MessageBox.Show("提取出錯！原因：" + err.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information); 
} 

} 




//把采集的產品頁面html代碼進行字符串處理，提取需要的代碼，最后保存到本地一個access數據庫中，同時提取產品圖片地址并自動現在圖片到本地images文件夾下 

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) 
{ 
//填充產品表 
Database.ExecuteNonQuery("delete from Tb_Product"); 
DataTable dt2 = new DataTable(); 
OleDbConnection conn = new OleDbConnection(Database.ConnectionStrings); 
OleDbDataAdapter da = new OleDbDataAdapter("select * from Tb_Product", conn); 
OleDbCommandBuilder cb = new OleDbCommandBuilder(da); 
da.Fill(dt2); 
dt2.Rows.Clear(); 

BackgroundWorker worker = (BackgroundWorker)sender;//這個是做一個進度條 

string[] Urls = textBox5.Text.Trim().ToLower().Replace("\r\n", ",").Split(','); 
DataTable dt = new DataTable(); 
StringBuilder ErrorStr = new StringBuilder(); 
string html = "", ImageDir = AppDomain.CurrentDomain.BaseDirectory + "Images\\"; 

//循環每次采集網址 
for (int i = 0; i < Urls.Length; i++) 
{ 
try 
{ 
if (!worker.CancellationPending) 
{ 
if (Urls[i] == "") 
return; 
html = inc.GetHtml(Urls[i]);//獲取該url的html代碼 
DataRow NewRow = dt2.NewRow(); 

//產品名 
string ProductName = html.Substring(html.IndexOf("<title>") + 7); 
NewRow["ProductName"] = ProductName.Remove(ProductName.IndexOf("</title>")).Trim(); 

//產品編號 
NewRow["ModelId"] = NewRow["ProductName"].ToString().Substring(NewRow["ProductName"].ToString().IndexOf("Model:") + 6).Trim(); 

//產品介紹，這些都是根據不同網站的html做相應的修改 
string Introduce = html.Substring(html.IndexOf("Product Details") + 26); 
Introduce = Introduce.Remove(Introduce.IndexOf("</table>") + 8).Trim() 

NewRow["Introduce"] = Introduce; 



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//下載圖片 
string ProductImage = html.Substring(html.IndexOf("align=center><img") + 17); 
ProductImage = textBox2.Text.Trim() + ProductImage.Substring(ProductImage.IndexOf("src=\"") + 5); 
ProductImage = ProductImage.Remove(ProductImage.IndexOf("\"")); 
try 
{ 
inc.DownFile(ProductImage, ImageDir + ProductImage.Substring(ProductImage.LastIndexOf("/") + 1)); 
} 
catch (Exception) 
{ 
ErrorStr.Append("下載圖片失敗，圖片地址：" + ImageDir + ProductImage.Substring(ProductImage.LastIndexOf("/") + 1) + "\r\n"); 
} 


dt2.Rows.Add(NewRow); 

//Thread.Sleep(100); 
worker.ReportProgress((i + 1) * 100 / Urls.Length, i); 
toolStripStatusLabel1.Text = "處理進度:" + (i + 1).ToString() + "/" + Urls.Length.ToString();//進度條 
} 

} 
catch (Exception err) 
{ 
ErrorStr.Append("采集錯誤：" + err.Message + ";網址：" + Urls[i] + "\r\n"); 
} 
} 
da.Update(dt2); 
DataBind(dt2); 
ShowError(ErrorStr.ToString()); 
} 

/// <summary> 
/// ASPX頁面生成靜態Html頁面，作者：鄭少群 
/// </summary> 
public static string GetHtml(string url) 
{ 
StreamReader sr = null; 
string str = null; 
//讀取遠程路徑 
WebRequest request = WebRequest.Create(url); 
HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 
sr = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(response.CharacterSet)); 
str = sr.ReadToEnd(); 
sr.Close(); 
return str; 
} 


// 提取HTML代碼中的網址 
public static ArrayList GetMatchesStr(string htmlCode, string strRegex) 
{ 
ArrayList al = new ArrayList(); 

Regex r = new Regex(strRegex, RegexOptions.IgnoreCase | RegexOptions.Multiline); 
MatchCollection m = r.Matches(htmlCode); 

for (int i = 0; i < m.Count; i++) 
{ 
bool rep = false; 
string strNew = m[i].ToString(); 

// 過濾重復的URL 
foreach (string str in al) 
{ 
if (strNew == str) 
{ 
rep = true; 
break; 
} 
} 

if (!rep) al.Add(strNew); 
} 

al.Sort(); 

return al; 
} 

public static void DownFile(string Url, string Path) 
{ 

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url); 
HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 
Stream stream = response.GetResponseStream(); 
long size = response.ContentLength; 
//創建文件流對象 
using (FileStream fs = new FileStream(Path, FileMode.OpenOrCreate, FileAccess.Write)) 
{ 
byte[] b = new byte[1025]; 
int n = 0; 
while ((n = stream.Read(b, 0, 1024)) > 0) 
{ 
fs.Write(b, 0, n); 
} 
} 
}