Beginner J2EE, a simple shopping cart system, function is not perfect, any questions please correct me

.project
.settings
.........\org.eclipse.jdt.core.prefs
.........\.jsdtscope
.........\org.eclipse.wst.jsdt.ui.superType.name
.........\org.eclipse.wst.jsdt.ui.superType.container
src
...\cn
...\..\itcast
...\..\......\cart
...\..\......\....\domain
...\..\......\....\......\Book.java
...\..\......\....\......\DB.java
...\..\......\....\......\ShoppingcartItem.java
...\..\......\....\......\Shoppingcart.java
...\..\......\....\web
...\..\......\....\...\servlet
...\..\......\....\...\.......\ListBookServlet.java
...\..\......\....\...\.......\BuyServlet.java
...\..\......\....\...\.......\ListCartServlet.java
...\..\......\....\...\.......\UpdateServlet.java
...\..\......\....\...\.......\DaleServlet.java
...\..\......\....\...\.......\clearServlet.java
WebRoot
.......\WEB-INF
.......\.......\classes
.......\.......\.......\cn
.......\.......\.......\..\itcast
.......\.......\.......\..\......\cart
.......\.......\.......\..\......\....\web
.......\.......\.......\..\......\....\...\servlet
.......\.......\.......\..\......\....\...\.......\clearServlet.class
.......\.......\.......\..\......\....\...\.......\UpdateServlet.class
.......\.......\.......\..\......\....\...\.......\ListCartServlet.class
.......\.......\.......\..\......\....\...\.......\ListBookServlet.class
.......\.......\.......\..\......\....\...\.......\DaleServlet.class
.......\.......\.......\..\......\....\...\.......\BuyServlet.class
.......\.......\.......\..\......\....\domain
.......\.......\.......\..\......\....\......\ShoppingcartItem.class
.......\.......\.......\..\......\....\......\Shoppingcart.class
.......\.......\.......\..\......\....\......\DB.class
.......\.......\.......\..\......\....\......\Book.class
.......\.......\lib
.......\.......\web.xml
.......\index.jsp
.......\META-INF
.......\........\MANIFEST.MF
.......\login.jsp
.......\listbook.jsp
.......\listcart.jsp
.......\carbuy.jsp
.classpath

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