购物车（JSTL实现）

package com.beans.shopping; import java.io.*; import java.util.*; /** * This class represents a product catalog. It holds a list of * products available for sale. * <p> * This is just a demo so the product list is hardcoded, created * at instantiation. A real version would get the information from * an external data source. */ public class CatalogBean implements Serializable { private Map catalog = new HashMap(); /** * Constructor. Creates all ProductBean objects and adds them * to the catalog. */ public CatalogBean() { ProductBean prod = new ProductBean(); prod.setId("1000"); prod.setName("JavaServer Pages"); prod.setDescr("Learn how to develop a JSP based web application."); prod.setPrice(32.95f); catalog.put("1000", prod); prod = new ProductBean(); prod.setId("2000"); prod.setName("Java Servlet Programming"); prod.setDescr("Learn how to develop a servlet based web application."); prod.setPrice(32.95f); catalog.put("2000", prod); prod = new ProductBean(); prod.setId("3000"); prod.setName("Java In a Nutshell"); prod.setDescr("Learn the Java programming language."); prod.setPrice(32.95f); catalog.put("3000", prod); } /** * Returns all products as an Iterator, suitable for looping. * * @return an Iterator for all ProductBean instances */ public ProductBean[] getProductList() { ProductBean[] products = new ProductBean[catalog.size()]; catalog.values().toArray(products); return products; } /** * Returns a Map with all ProductBean instances, keyed by ID. * * @return an Map of all ProductBean instances */ public Map getProductsById() { return catalog; } }