javaweb学习7_Session案例之购物车

1. 简易session版购物车:创建一个简单的购物车模型，由三个 jsp 和两个 Servlet 组成：

 

 

 

 

checkbox 是一组的话 name必须一致

代码：

 

　　1）step-1.jsp

 

 

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 
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 5 
 6 
 7 
 8 
 9 
10     
Step1:选择要购买的图书
11     
12     

13         
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25                 
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30                 
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40         
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42         
书名
购买
Java
Oracle
Struts

36                     
37                 
43     
44 
45 
46 

 

 

　　　　　　　　

 

　　2）step-2.jsp

 

 

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 
 4 
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 8 
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10     

11     
step2: 请输入寄送的地址和信用卡信息
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49 
寄送信息
姓名：
寄送地址：
信用卡信息
种类：

34                 Visa
35                 Master 
36             
37             
卡号：

47             
50     
51 
52 

 

 

　　　　　　

　　3）confim.jsp

 

 

 1 <%@page import="com.jason.shoopingcart.bean.Customer"%>
 2 <%@ page language="java" contentType="text/html; charset=UTF-8"
 3     pageEncoding="UTF-8"%>
 4 
 5 
 6 
 7 
 8 
 9 
10 
11 
12     <%
13         Customer customer = (Customer)session.getAttribute("customer");
14         String[] books = (String[])session.getAttribute("books");
15     %>
16     
17         
18             
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45     
顾客姓名：
<%= customer.getName() %>
地址：
<%= customer.getAddress() %>
卡号：
<%= customer.getCard()%>
卡的类型：
<%= customer.getCardType()%>
买的书：

37                 <%
38                     for(String book : books ){
39                         out.print(book);
40                         out.print("
");
41                     }
42                 %>
43             
46 
47 
48 

 

 

　　

　　4）ProcessStep1Servlet.java

 

 

 1  1 package com.jason.shoopingcart.servlet;
 2  2 
 3  3 import java.io.IOException;
 4  4 import javax.servlet.ServletException;
 5  5 import javax.servlet.annotation.WebServlet;
 6  6 import javax.servlet.http.HttpServlet;
 7  7 import javax.servlet.http.HttpServletRequest;
 8  8 import javax.servlet.http.HttpServletResponse;
 9  9 
10 10 /**
11 11  * Servlet implementation class ProcessStep1Servlet
12 12  */
13 13 @WebServlet("/processStep1")
14 14 public class ProcessStep1Servlet extends HttpServlet {
15 15     private static final long serialVersionUID = 1L;
16 16 
17 17     
18 18     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
19 19 
20 20         //1.获取选中的图书的信息
21 21         String[] books = request.getParameterValues("book");
22 22         
23 23         //2.把图书信息放入到HttpSession 中
24 24         request.getSession().setAttribute("books", books);
25 25         
26 26         //3.重定向到shoppingcart/step-2.jsp
27 27         response.sendRedirect(request.getContextPath() + "/shoppingcart/step-2.jsp");
28 28         
29 29     }
30 30 
31 31 }

 

 

 

　　

　　5）ProcessStep2Servlet.java

 

 1 1 package com.jason.shoopingcart.servlet;
 2  2 
 3  3 import java.io.IOException;
 4  4 
 5  5 import javax.servlet.ServletException;
 6  6 import javax.servlet.annotation.WebServlet;
 7  7 import javax.servlet.http.HttpServlet;
 8  8 import javax.servlet.http.HttpServletRequest;
 9  9 import javax.servlet.http.HttpServletResponse;
10 10 import javax.servlet.http.HttpSession;
11 11 
12 12 import com.jason.shoopingcart.bean.Customer;
13 13 
14 14 /**
15 15  * Servlet implementation class ProcessStep2Servlet
16 16  */
17 17 @WebServlet("/processStep2")
18 18 public class ProcessStep2Servlet extends HttpServlet {
19 19     private static final long serialVersionUID = 1L;
20 20 
21 21     
22 22     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
23 23         //1. 获取请求参数 name ,address ,cardType,card
24 24         request.setCharacterEncoding("UTF-8");
25 25         String name = request.getParameter("name");
26 26         String address = request.getParameter("address");
27 27         String cardType = request.getParameter("cardType");
28 28         String card = request.getParameter("card");
29 29         
30 30         Customer customer = new Customer(name, address, cardType, card);
31 31         
32 32         //2.把请求存储到Httpsession中
33 33          HttpSession  session = request.getSession();
34 34          session.setAttribute("customer", customer);
35 35         
36 36         //3.重定向到confirm.jsp
37 37          response.sendRedirect(request.getContextPath() + "/shoppingcart/confirm.jsp");
38 38     }
39 39 
40 40 }

 

 

 

　　　

　　6）Customer.java

 

 

 1 package com.jason.shoopingcart.bean;
 2 
 3 public class Customer {
 4     private String name;
 5     private String address;
 6     private String cardType;
 7     private String card;
 8 
 9     public String getName() {
10         return name;
11     }
12 
13     public void setName(String name) {
14         this.name = name;
15     }
16 
17     public String getAddress() {
18         return address;
19     }
20 
21     public void setAddress(String address) {
22         this.address = address;
23     }
24 
25     public String getCardType() {
26         return cardType;
27     }
28 
29     public void setCardType(String cardType) {
30         this.cardType = cardType;
31     }
32 
33     public void setCard(String card) {
34         this.card = card;
35     }
36     public String getCard() {
37         return card;
38     }
39     
40     
41 
42     public Customer(String name, String address, String cardType, String card) {
43         super();
44         this.name = name;
45         this.address = address;
46         this.cardType = cardType;
47         this.card = card;
48     }
49 
50     public Customer() {
51         super();
52     }
53 
54 }