AddUploader makes a uploader generator available by the provided theme name. If Add is called twice with the same name or if uploader is nil, it panics.
SaveMultipartFile used in a local Uploader which help to save file in the local path.
Upload receive the return value of given UploadFun and put them into the form.
LocalFileUploader is an Uploader of local file engine.
Upload implements the Uploader.Upload.
UploadFun is a function to process the uploading logic.
Uploader is a file uploader which contains the method Upload.
GetFileEngine return the Uploader of given name.
GetLocalFileUploader return the default Uploader.
UploaderGenerator is a function return an Uploader.