fix bug for the problem of not matching filename with dot

config/routes.rb

@@ -39,7 +39,7 @@ Rails.application.routes.draw do
    get '/xhr/announcements/announcement.json', to: 'bulletins#get_bulletins'
    get '/xhr/panel/announcement/widget/sync_data' => 'announcements#show_widget'
    get '/xhr/announcements/:slug_title-:uid/comment', to: 'announcements#comment' 
-   get '/xhr/announcements/file/:id/:f_name' => 'announcements#get_file'
+   get '/xhr/announcements/file/:id/*f_name' => 'announcements#get_file'
   end
   
 end