To display a list is quite easy. Just create a property of type List in your ActionForm that represents a list of JavaBeans. Then populate the list in your Action class. Your JSP would then look something like this:
If you need to create input fields for each member of the list, it's a bit more complicated. You need to use indexed properties and create indexed getters and setters in your ActionForm. The following two links give you more information on how to use indexed properties.