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小结
这样一来，JSP就能极大的扩展了 servlet 技术，由于支持 Java 脚本，JSP和Servlet就使网页设计师能够随心所欲的开发出高品质的动态网页程序。但不管怎么说，JSP也是不会代替 servlets的，因为servlets，JSP和JavaBeans在网络体系结构中起着互相补足的作用。通过遵从MVC模式， JSP应用程序能够独立地扩大或提高用于后台控制的servlet，JSP页面和现实的应用程序模型。应用程序模型能被扩展到一个两层或三层的方案，并且增加助手Bean，这都能管理JSP工作流程和支持应用程序组件之间的宽松联接。
附录一、 InventoryBean.java类(下面我将不会对代码进行过多的解释）
package shoppingcart;
public class InventoryBean {
/*
商品名称
*/
private static final String[] names =
{ "牙膏", "肥皂", "毛巾",
"口香糖", "牙刷", "练习本",
"钢笔"};
/*
商品序列号。
*/
private static final int[] skus =
{ 1, 2, 3, 4, 5, 6, 7 };
/*
商品每件的价格。
*/
private static final double[] prices =
{ 2.50, 3.90, 5.25, 1.00,
3.50, 0.40, 11.80};
private Product[] catalogue_ = null;
private static InventoryBean inventory_ = new InventoryBean();
private InventoryBean() {
catalogue_ = new Product[skus.length];
for (int i = 0; i ＜ skus.length; i++) {
catalogue_[i] = createProduct(skus[i]);
}
}
public static Product[] getCatalogue() {
return inventory_.catalogue_;
}
private Product createProduct(int sku) {
return new Product(sku, names[sku-1], prices[sku-1]);
}
}
附录二、Product类
package shoppingcart;
public class Product implements Cloneable {
private int sku_ = 0;
private String name_ = null;
private double price_ = 0;
private int Pieces_ = 0;
public String toString() {
return "商品序列号: " + sku_ + ", 商品名: " + name_ +
", 单价: " + price_ + ", 件数: " + pieces_;
}
public Product(int sku, String name, double price) {
sku_ = sku;
name_ = name;
price_ = price;
}
public int getSKU() {
return sku_;
}
public String getName() {
return name_;
}
public double getPrice() {
return price_;
}
public double getPieces() {
return pounds_;
}
public void setPieces(int pieces) {
pieces_ = pieces;
}
public Object clone() {
Object dup = null;
try {
up = super.clone();
}
catch(CloneNotSupportedException ignore) { }
return dup;
}
}
附录三、ReceiptBean类
package shoppingcart;
import javax.servlet.*;
import javax.servlet.http.*;
public class ReceiptBean {
private String name_ = null;
private String email_ = null;
private String address_ = null;
private String phone_ = null;
public ReceiptBean() {
}
public void setName(String name) {
name_ = name;
}
public String getName() {
return name_;
}
public void setEmail(String email) {
email_ = email;
}
public String getEmail() {
return email_;
}
public void setAddress(String address) {
address_ = address;
}
public String getAddress() {
return address_;
}
public void setPhone(String phone) {
phone_ = phone;
}
public String getPhone() {
return phone_;
}
}
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