学习使用Structs框架,可以从列表中显示的条目，按照选取的颜色，从数据库获取的啤酒，用MVC设计思想，选择显示相应啤酒的详细信息列表，并归并重复项，显示每种啤酒选购数量-Learn how to use Structs framework that can be displayed from the list of entries, in accordance with the selected color, get a beer from the database, using MVC design ideas, choose to display the corresponding details of beer list and merge duplicate entries, showing the number of each beer purchase