说明：  在本章中我们使用JSP和Java Bean来构建一个网上书店。本章介绍的例子可以分成两大部分，第一部分是普通程序，用于客户在网上选购图书，第二部分是管理程序，用于在服务器端处理客户的定单。客户端程序由以下几个部分构成： default.jsp：会员登录界面(首页)； checklogon.jsp：检测登录代码和密码是否一致，根据由JavaBean返回的结果显示不同的信息。 BuyerBean：会员的合法性检验所用的Bean； booklist.jsp：给登录会员显示当前书店中可供选择的图书； addcart.jsp：将所选的图书加入购物车； shoppingcart.jsp：查看购物车的内容；
(In this chapter we use the JSP and Java Bean to build an online bookstore. The examples presented in this chapter can be divided into two parts, first part is the ordinary procedure for customers to buy books online, the second part is the management process for the server-side processing of customer orders. The client program consists of the following composition: default.jsp: Member login screen (page) checklogon.jsp: Detection login code and password are the same, to display different information based on the results returned by the JavaBean. BuyerBean: members of the legitimacy of test used by the bean booklist.jsp: Login to display the current bookstore books to choose from addcart.jsp: the selected books in the shopping cart shoppingcart.jsp: View the contents of the shopping cart )