/// <summary>
/// 获取网站对应的区块设置
/// </summary>
/// <param name="CrawlerConfigId"></param>
/// <returns>区块层级配置信息</returns>
public List <CrawlerPartConfig> GetCrawlerPartConfig(Guid CrawlerConfigId)
{
Database db = new Database();
List <CrawlerPartConfig> cpc_list = new List <CrawlerPartConfig>();
try
{
StringBuilder sb = new StringBuilder();
sb.Append("select * from dbo.CrawlerPartConfig where CrawlerConfigId = @CrawlerConfigId; ");
SqlParameter[] parameters =
{
db.MakeParam("CrawlerConfigId", SqlDbType.UniqueIdentifier, 0, ParameterDirection.Input, CrawlerConfigId)
};
DataSet ds = db.ExeQueryGetDataSet(sb.ToString(), parameters);
foreach (DataRow item in ds.Tables[0].Rows)
{
CrawlerPartConfig cpc = new CrawlerPartConfig()
{
Id = new Guid(item["Id"].ToString()),
CrawlerConfigId = new Guid(item["CrawlerConfigId"].ToString()),
FetchModel = Convert.ToInt32(item["FetchModel"]),
IndexLink_XPath = item["IndexLink_XPath"] == DBNull.Value ? null : item["IndexLink_XPath"].ToString(),
LoadMoreButton_XPath = item["LoadMoreButton_XPath"] == DBNull.Value ? null : item["LoadMoreButton_XPath"].ToString(),
PageNumInput_XPath = item["PageNumInput_XPath"] == DBNull.Value ? null : item["PageNumInput_XPath"].ToString(),
GoToButton_XPath = item["GoToButton_XPath"] == DBNull.Value ? null : item["GoToButton_XPath"].ToString(),
FirstPage = item["FirstPage"] == DBNull.Value ? null : (int?)(Convert.ToInt32(item["FirstPage"])),
LastPage = item["LastPage"] == DBNull.Value ? null : (int?)(Convert.ToInt32(item["LastPage"])),
ExtentionData1 = item["ExtentionData1"] == DBNull.Value ? null : item["ExtentionData1"].ToString(),
ExtentionData2 = item["ExtentionData2"] == DBNull.Value ? null : item["ExtentionData2"].ToString(),
ExtentionData3 = item["ExtentionData3"] == DBNull.Value ? null : item["ExtentionData3"].ToString(),
ExtentionData4 = item["ExtentionData4"] == DBNull.Value ? null : item["ExtentionData4"].ToString(),
ExtentionData5 = item["ExtentionData5"] == DBNull.Value ? null : item["ExtentionData5"].ToString(),
Title_Xpath = item["Title_Xpath"] == DBNull.Value ? null : item["Title_Xpath"].ToString(),
Content_Xpath = item["Content_Xpath"] == DBNull.Value ? null : item["Content_Xpath"].ToString(),
Editor_Xpath = item["Editor_Xpath"] == DBNull.Value ? null : item["Editor_Xpath"].ToString(),
Source_Xpath = item["Source_Xpath"] == DBNull.Value ? null : item["Source_Xpath"].ToString(),
PublishTime_Xpath = item["PublishTime_Xpath"] == DBNull.Value ? null : item["PublishTime_Xpath"].ToString()
};
cpc_list.Add(cpc);
}
return(cpc_list);
}
catch (Exception ex)
{
throw ex;
}
finally
{
db.Close();
db.Dispose();
}
}
private News GetNews(PhantomJSDriver driver, CrawlerPartConfig cpc, Uri uri, int threadId, int milliseconds)
{
string title = driver.FindElement(By.XPath(cpc.Title_Xpath)).Text;
var contentcollection = driver.FindElements(By.XPath(cpc.Content_Xpath));
string content = string.Empty;
foreach (var item in contentcollection)
{
content += item.Text;
}
string source = string.Empty;
string editor = string.Empty;
DateTime?publishtime = null;
if (!string.IsNullOrEmpty(cpc.Source_Xpath))
{
source = driver.FindElement(By.XPath(cpc.Source_Xpath)).Text;
}
if (!string.IsNullOrEmpty(cpc.Editor_Xpath))
{
editor = driver.FindElement(By.XPath(cpc.Editor_Xpath)).Text;
}
if (!string.IsNullOrEmpty(cpc.PublishTime_Xpath))
{
publishtime = Convert.ToDateTime(driver.FindElement(By.XPath(cpc.PublishTime_Xpath)).Text.TrimStart().Substring(0, 16));
}
News news = new News()
{
Id = Guid.NewGuid(),
CrawlerConfigId = cpc.CrawlerConfigId,
Title = title,
Content = content,
Editor = editor,
Source = source,
Address = uri.ToString(),
SpendTime = milliseconds,
ThreadId = threadId,
PublishTime = publishtime
};
//WriteLog.InsertLogs(uri.ToString(), "步骤二");
return(news);
}
private void StartSync(CrawlerPartConfig cpc, string Address, ref List <Target> List_tar)
{
try
{
Uri uri = new Uri(Address);
if (cpc.FetchModel == 1)
{
PhantomJSDriver driver = sc.StartSync(uri, null, null);
var titlecollection = driver.FindElements(By.XPath(cpc.IndexLink_XPath));
foreach (var item in titlecollection)
{
if (!string.IsNullOrEmpty(item.Text))
{
Target t = new Target
{
Name = item.Text,
Uri = item.GetAttribute("href"),
Operation = null,
CPC = cpc
};
List_tar.Add(t);
}
}
driver.Quit();
}
else if (cpc.FetchModel == 3)
{
Operation opera = new Operation
{
Action = (x) =>
{
x.FindElement(By.XPath(cpc.LoadMoreButton_XPath)).Click();
},
Condition = (x) =>
{
return(!x.FindElement(By.XPath(cpc.ExtentionData1)).Displayed);
},
Timeout = 10000,
ExtentionData1 = cpc.ExtentionData1,
ExtentionData2 = cpc.ExtentionData2,
ExtentionData3 = cpc.ExtentionData3
};
PhantomJSDriver driver = sc.StartSync(uri, null, opera);
var titlecollection = driver.FindElements(By.XPath(cpc.IndexLink_XPath));
foreach (var item in titlecollection)
{
if (!string.IsNullOrEmpty(item.Text))
{
Target t = new Target
{
Name = item.Text,
Uri = item.GetAttribute("href"),
Operation = null,
CPC = cpc
};
List_tar.Add(t);
}
}
driver.Quit();
}
else if (cpc.FetchModel == 5)
{
Script script = new Script()
{
Code = "document.body.scrollTop=10000",
Condition = (x) =>
{
return(!x.FindElement(By.XPath(cpc.ExtentionData1)).Displayed);
},
ActionTimes = Convert.ToInt32(cpc.ExtentionData4),
FetchModel = 5,
Timeout = 10000
};
PhantomJSDriver driver = sc.StartSync(uri, script, null);
var titlecollection = driver.FindElements(By.XPath(cpc.IndexLink_XPath));
foreach (var item in titlecollection)
{
if (!string.IsNullOrEmpty(item.Text))
{
Target t = new Target
{
Name = item.Text,
Uri = item.GetAttribute("href"),
Operation = null,
CPC = cpc
};
List_tar.Add(t);
}
}
driver.Quit();
}
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 异步创建爬虫
/// </summary>
/// <param name="uri">爬虫URL地址</param>
/// <param name="proxy">代理服务器</param>
/// <returns>网页源代码</returns>
public async Task StartAsync(Uri uri, Script script, Operation operation, CrawlerPartConfig cpc)
{
await Task.Run(() =>
{
try
{
Semaphore.Wait();
//OnStart?.Invoke(this, new OnStartEventArgs(uri));
var _service = PhantomJSDriverService.CreateDefaultService();
_service.LoadImages = false;
var _option = new PhantomJSOptions();
var driver = new PhantomJSDriver(_service, _option);
try
{
//WriteLog.InsertLogs(uri.ToString(), "步骤零");
var watch = DateTime.Now;
driver.Navigate().GoToUrl(uri.ToString());
if (script != null)
{
driver.ExecuteScript(script.Code, script.Args);
}
if (operation != null)
{
ExecuteAction(operation, driver);
}
var threadId = Thread.CurrentThread.ManagedThreadId;
var seconds = Convert.ToInt32(DateTime.Now.Subtract(watch).TotalSeconds);
//WriteLog.InsertLogs(uri.ToString(), "步骤一");
//打开网页时间过长可能导致driver被垃圾回收，限制为30秒
if (seconds < 30)
{
News news = GetNews(driver, cpc, uri, threadId, seconds);
OnCompleted?.Invoke(this, new OnCompletedEventArgs(news));
//OnCompleted?.Invoke(this, new OnCompletedEventArgs(uri, threadId, milliseconds, pageSource, driver, cpc));
}
else
{
WriteLog.InsertLogs(uri.ToString(), "打开网页超时");
if (driver != null)
{
driver.Quit();
driver = null;
//WriteLog.InsertLogs(uri.ToString(), "结束");
}
}
}
catch (Exception ex)
{
OnError?.Invoke(this, new OnErrorEventArgs(uri, ex));
//WriteLog.InsertLogs(uri.ToString(), ex.Message);
}
finally
{
if (driver != null)
{
driver.Quit();
//WriteLog.InsertLogs(uri.ToString(), "结束");
}
}
}
catch (Exception ex)
{
OnError?.Invoke(this, new OnErrorEventArgs(uri, ex));
//WriteLog.InsertLogs(uri.ToString(), ex.Message);
}
finally
{
Semaphore.Release();
}
});
}
