====== Spring Form Input From HttpServletRequest ======
From those who do not like what Spring automatically bind the form input to an object, we can do it ourselves by using ''HttpServletRequest''.

  - In your controller, ''import javax.servlet.http.HttpServletRequest''
  - In your method add HttpServletRequest as a parameter, Spring will give the value to you.
  - Now you can use request.getParameter(...) to get field value or request.getParameterValues(...) to get array value. Note all value are in type ''String''. You need to do your own conversion if needed.