/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="imagefilePath">图片路径</param>
/// <param name="timming">生成方式</param>
public static void HandleThumbnail(string imagefilePath, Timming timming)
{
UploadFileInfo _fileInfo = FileHelper.GetFileInfo(imagefilePath, @"^(.*)\\upload\\(.+)\\(day_\d+)\\(\d+)(\.[A-Za-z]+)$");
if (_fileInfo == null)
{
return;
}
string _root = _fileInfo.Root,
_folder = _fileInfo.Folder,
_subFolder = _fileInfo.SubFolder,
_fileName = _fileInfo.FileName,
_fileExt = _fileInfo.FileNameExt;
foreach (var pair in UploadConfigContext.ThumbnailConfigDic
.Where(t => t.Key.StartsWith(_fileInfo.Folder.ToLower() + "_") && t.Value.Timming == timming))
{
ThumbnailSize _size = pair.Value;
string _thumbnailFileFolder = string.Format("{0}\\upload\\{1}\\{2}\\thumb",
_root, _folder, _subFolder);
if (!Directory.Exists(_thumbnailFileFolder))
{
Directory.CreateDirectory(_thumbnailFileFolder);
}
string _thumbnailFilePath = string.Format("{0}\\upload\\{1}\\{2}\\thumb\\{3}_{4}_{5}{6}",
_root, _folder, _subFolder, _fileName, _size.Width, _size.Height, _fileExt);
ThumbnailHelper.MakeThumbnail(imagefilePath, _thumbnailFilePath, _size);
}
}
/// <summary>
/// Processes the request.
/// </summary>
/// <param name="context">The context.</param>
public void ProcessRequest(HttpContext context)
{
//如果304已缓存了，则返回
if (!string.IsNullOrEmpty(context.Request.Headers["If-Modified-Since"]))
{
context.Response.StatusCode = 304;
context.Response.StatusDescription = "Not Modified";
return;
}
string _path = context.Request.CurrentExecutionFilePath;
if (!_path.EndsWith(".axd") && !_path.StartsWith("/Upload", StringComparison.OrdinalIgnoreCase))
{
return;
}
//正则从Url里匹配出上传的文件夹目录.....
Match _uploadfolder = Regex.Match(_path, @"upload/(.+)/(day_\d+)/thumb/(\d+)_(\d+)_(\d+)\.([A-Za-z]+)\.axd$", RegexOptions.IgnoreCase);
if (!_uploadfolder.Success)
{
return;
}
string _folder = _uploadfolder.Groups[1].Value,
_subFolder = _uploadfolder.Groups[2].Value,
_fileName = _uploadfolder.Groups[3].Value,
_width = _uploadfolder.Groups[4].Value,
_height = _uploadfolder.Groups[5].Value,
_fileExt = _uploadfolder.Groups[6].Value;
//如果在配置找不到需要按需生成的，则返回，这样能防止任何人随便敲个尺寸就生成
string _key = string.Format("{0}_{1}_{2}", _folder, _width, _height).ToLower();
bool isOnDemandSize = UploadConfigContext.ThumbnailConfigDic.ContainsKey(_key) && UploadConfigContext.ThumbnailConfigDic[_key].Timming == Timming.OnDemand;
if (!isOnDemandSize)
{
return;
}
string _thumbnailFilePath = string.Format(@"{0}\{1}\Thumb\{2}_{4}_{5}.{3}", _folder, _subFolder, _fileName, _fileExt, _width, _height);
_thumbnailFilePath = Path.Combine(UploadConfigContext.UploadPath, _thumbnailFilePath);
string _filePath = string.Format(@"{0}\{1}\{2}.{3}", _folder, _subFolder, _fileName, _fileExt);
_filePath = Path.Combine(UploadConfigContext.UploadPath, _filePath);
if (!File.Exists(_filePath))
{
return;
}
//如果不存在缩略图，则生成
if (!File.Exists(_thumbnailFilePath))
{
string _thumbnailFileFolder = string.Format(@"{0}\{1}\Thumb", _folder, _subFolder);
_thumbnailFileFolder = Path.Combine(UploadConfigContext.UploadPath, _thumbnailFileFolder);
if (!Directory.Exists(_thumbnailFileFolder))
{
Directory.CreateDirectory(_thumbnailFileFolder);
}
ThumbnailHelper.MakeThumbnail(_filePath, _thumbnailFilePath, UploadConfigContext.ThumbnailConfigDic[_key]);
}
//缩略图存在了，返回图片字节，并输出304标记
context.Response.Clear();
context.Response.ContentType = HttpContextHelper.GetImageContentType(_fileExt);
byte[] _responseImage = File.ReadAllBytes(_thumbnailFilePath);
context.Response.BinaryWrite(_responseImage);
context.Set304Cache();
context.Response.Flush();
}
/// <summary>
/// 延迟生成图片缩略图
/// </summary>
public static void HandlerLazyThumbnail()
{
foreach (var group in UploadConfigContext.UploadConfig.UploadFolders)
{
string _folder = Path.Combine(UploadConfigContext.UploadPath, group.Path);
if (!Directory.Exists(_folder))
{
continue;
}
foreach (string dayFolder in Directory.GetDirectories(_folder))
{
foreach (string filePath in Directory.GetFiles(dayFolder))
{
UploadFileInfo _fileInfo = FileHelper.GetFileInfo(filePath, @"^(.+\\day_\d+)\\(\d+)(\.[A-Za-z]+)$");
if (_fileInfo == null)
{
continue;
}
string _root = _fileInfo.Root,
_fileName = _fileInfo.FileName,
_fileExt = _fileInfo.FileNameExt,
_thumbnailFileFolder = Path.Combine(dayFolder, "Thumb");
if (!Directory.Exists(_thumbnailFileFolder))
{
Directory.CreateDirectory(_thumbnailFileFolder);
}
//删除配置里干掉的Size对应的缩略图
//先不启用，等配置添完了再启用
//foreach (var thumbFilePath in Directory.GetFiles(thumbnailFileFolder))
//{
// if (!group.ThumbnailSizes.Exists(s =>
// Regex.IsMatch(thumbFilePath, string.Format(@"\\\d+_{0}_{1}+\.[A-Za-z]+$", s.Width, s.Height))))
// File.Delete(thumbFilePath);
//}
foreach (var size in group.ThumbnailSizes)
{
if (size.Timming != Timming.Lazy)
{
continue;
}
string _thumbnailFilePath = string.Format("{0}\\thumb\\{1}_{2}_{3}{4}",
_root, _fileName, size.Width, size.Height, _fileExt);
if (File.Exists(_thumbnailFilePath) && size.IsReplace)
{
File.Delete(_thumbnailFilePath);
}
if (!File.Exists(_thumbnailFilePath))
{
ThumbnailHelper.MakeThumbnail(filePath, _thumbnailFilePath, size);
}
}
}
}
}
}