问题
I need to view only some list of extensions in the dialog not even choosing them as a possible variant of file. Using p:FileUpload.
回答1:
Per the Primefaces Development Guide 2.2,
allowTypes - Semi colon separated list of file extensions to accept.
The following is an attribute of the fileUpload component tag.
来源：https://stackoverflow.com/questions/6343184/primefaces-fileupload-extensions-filter