public Crawler Fetch()
{
if (!IsExternalIPAddress(this.SourceUrl))
{
State = "INVALID_URL";
return(this);
}
var request = HttpWebRequest.Create(this.SourceUrl) as HttpWebRequest;
using (var response = request.GetResponse() as HttpWebResponse)
{
if (response.StatusCode != HttpStatusCode.OK)
{
State = "Url returns " + response.StatusCode + ", " + response.StatusDescription;
return(this);
}
if (response.ContentType.IndexOf("image") == -1)
{
State = "Url is not an image";
return(this);
}
var fileName = PathFormatter.Format(Path.GetFileName(this.SourceUrl), Config.GetString("catcherPathFormat"));
try
{
var stream = response.GetResponseStream();
var reader = new BinaryReader(stream);
using (var ms = new MemoryStream())
{
byte[] buffer = new byte[4096];
int count;
while ((count = reader.Read(buffer, 0, buffer.Length)) != 0)
{
ms.Write(buffer, 0, count);
}
ms.Seek(0, SeekOrigin.Begin);
_uploadFolder.CreateFile(fileName, ms);
ServerUrl = _uploadFolder.GetUrl(fileName);
}
State = "SUCCESS";
}
catch (Exception e)
{
State = "抓取错误：" + e.Message;
}
return(this);
}
}
public override void Process()
{
try
{
Start = String.IsNullOrEmpty(Request["start"]) ? 0 : Convert.ToInt32(Request["start"]);
Size = String.IsNullOrEmpty(Request["size"])
? Config.GetInt("imageManagerListSize")
: Convert.ToInt32(Request["size"]);
}
catch (FormatException)
{
State = ResultState.InvalidParam;
WriteResult();
return;
}
var buildingList = new List <String>();
try
{
buildingList.AddRange(_uploadFolder.ListFiles(PathToList, SearchExtensions, Start, Size, true)
.Select(x => _uploadFolder.GetUrl(x)));
Total = buildingList.Count;
FileList = buildingList.OrderBy(x => x).Skip(Start).Take(Size).ToArray();
}
catch (UnauthorizedAccessException)
{
State = ResultState.AuthorizError;
}
catch (DirectoryNotFoundException)
{
State = ResultState.PathNotFound;
}
catch (IOException)
{
State = ResultState.IOError;
}
finally
{
WriteResult();
}
}
