爱华网1./*类Product */
2.3.package shopcart.dto;
4.5.import java.io.Serializable;
6.7.public class Product implements Serializable
8.{
9. private String id;//产品标识 10. private String name;//产品名称 11. private String description;//产品描述 12. private double price;//产品价格 13.14. public Product()
15. {
16. }
17.18. public Product(String id, String name, String description, double price)
19. {
20. this.id = id;
21. this.name = name;
22. this.description = description;
23. this.price = price;
24. }
25.26. public void setId(String id)
27. {
28. this.id = id;
29. }
30.31. public void setName(String name)
32. {
33. this.name = name;
34. }
35.36. public void setDescription(String description)
37. {
38. this.description = description;
39. }
40.41. public void setPrice(double price)
42. {
43. this.price = price;
44. }
45.46. public String getId()
47. {
48. return id;
49. }
50.51. public String getName()
52. {
53. return name;
54. }
55.56. public String getDescription()
57. {
58. return description;
59. }
60.61. public double getPrice()
62. {
63. return price;
64. }
65.}
66./*类ShopCart */
67.68.package shopcart.dto;
69.70.import java.io.Serializable;
71.import java.util.*;
72.73.public class ShopCart implements Serializable
74.{
75. public ShopCart()
76. {
77. }
78.79. private List cart = null;
80.81. /**
82. * 添加一个产品到购物车
83. * @param product Product
84. */
85. public void addProductToCart(Product product)
86. {
87. if (cart == null)
88. cart = new ArrayList();
89. Iterator it = cart.iterator();
90. while (it.hasNext())
91. {
92. Product item = (Product) it.next();
93. if (item.getId().equals(product.getId()))
94. {
95. return;
96. }
97. }
98. cart.add(product);
99. }
100.101. /**
102. * 从购物车中删除一产品
103. * @param productId String 产品id
104. */
105. public void removeProductFromCart(String productId)
106. {
107. if (cart == null)
108. return;
109. Iterator it = cart.iterator();
110. while (it.hasNext())
111. {
112. Product item = (Product) it.next();
113. if (item.getId().equals(productId))
114. {
115. it.remove();
116. return;
117. }
118. }
119. }
120.121. /**
122. * 计算购物车中的商品价格
123. * @return double 商品价格总数
124. */
125. public double getAllProductPrice()
126. {
127. if (cart == null)
128. return 0;
129. double totalPrice = 0;
130. Iterator it = cart.iterator();
131. while (it.hasNext())
132. {
133. Product item = (Product) it.next();
134. totalPrice += item.getPrice();
135. }
136. return totalPrice;
137. }
138.139. /**
140. * 返回购物车所有产品信息
141. * @return List
142. */
143. public List getAllProductsFromCart()
144. {
145. return cart;
146. }
147.}
148.149.2.在WebRoot目录下添加包shopCart 在里边添加ShowProductsJSP.jsp ShoppingJSP.jsp ShopCartJSP.jsp
ShowProductsJSP.jsp :::::::::
1.<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
2.<%@ page import="shopcart.dto.*"%>
3.<%
4. String path = request.getContextPath();
5. String basePath = request.getScheme() + "://"
6. + request.getServerName() + ":" + request.getServerPort()
7. + path + "/";
8.%>
9.10.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
11.<html>
12. <head>
13. <base href="<%=basePath%>">
14.15. <title>My JSP 'ShowProductsJSP.jsp' starting page</title>
16.17. <meta http-equiv="pragma" content="no-cache">
18. <meta http-equiv="cache-control" content="no-cache">
19. <meta http-equiv="expires" content="0">
20. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
21. <meta http-equiv="description" content="This is my page">
22. <!--
23. <link rel="stylesheet" type="text/css" href="styles.css">
24. -->
25.26. </head>
27.28. <body bgcolor="#ffffff">
29. <%
30. Map products = new HashMap();
31. products.put("001", new Product("001", "mp3播放器",
32. "效果很不错的mp3播放器，存储空间达1GB", 999.00));
33. products.put("002", new Product("002", "数码相机", "象素500万，10倍光学变焦",
34. 2500.00));
35. products.put("003", new Product("003", "数码摄像机",
36. "120万象素，支持夜景拍摄，20倍光学变焦", 5999.00));
37. products.put("004", new Product("004", "迷你mp4",
38. "市面所能见到的最好的mp4播放器，国产", 1999.99));
39. products.put("005", new Product("005", "多功能手机",
40. "集mp3播放、100万象素数码相机，手机功能于一体", 2199.99));
41. ServletContext context = getServletContext();
42. context.setAttribute("products", products);
43. %>
44. <H1>
45. 产品显示
46. </H1>
47. <a href="/helloApp/shopCart/ShowCartJSP.jsp">查看购物车</a>
48.49. <form name="productForm" action="/helloApp/shopCart/ShoppingJSP.jsp" method="POST">
50. <input type="hidden" name="action" value="purchase">
51. <table border="1" cellspacing="0">
52. <tr bgcolor="#CCCCCC">
53. <tr bgcolor="#CCCCCC">
54. <td>
55. 序号
56. </td>
57. <td>
58. 产品名称
59. </td>
60. <td>
61. 产品描述
62. </td>
63. <td>
64. 产品价格（￥）
65. </td>
66. <td>
67. 添加到购物车
68. </td>
69. </tr>
70. <%
71. Set productIdSet = products.keySet();
72. Iterator it = productIdSet.iterator();
73. int number = 1;
74.
75. while (it.hasNext()) {
76. String id = (String) it.next();
77. Product product = (Product) products.get(id);
78. %><tr>
79. <td>
80. <%=number++ %></td>
81. <td>
82. <%=product.getName()%>
83. </td>
84. <td><%=product.getDescription() %>
85. </td>
86. <td>
87. <%=product.getPrice() %></td>
88. <td>
89. <input type="checkbox" name="productId"
90. value="<%=product.getId() %>">
91. </td>
92. </tr>
93. <% }%>
94. </table>
95. <p>
96. <input type="reset" value="全部取消" />
97. <input type="submit" value="确定" />
98. </p>
99. </form>
100. </body>
101.</html>
102.ShoppingJSP.jsp::::::::::
1.<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
2.<%@ page import="shopcart.dto.*"%>
3.<%
4. String path = request.getContextPath();
5. String basePath = request.getScheme() + "://"
6. + request.getServerName() + ":" + request.getServerPort()
7. + path + "/";
8.%>
9.10.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
11.<html>
12. <head>
13. <base href="<%=basePath%>">
14.15. <title>My JSP 'shopping.jsp' starting page</title>
16.17. <meta http-equiv="pragma" content="no-cache">
18. <meta http-equiv="cache-control" content="no-cache">
19. <meta http-equiv="expires" content="0">
20. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
21. <meta http-equiv="description" content="This is my page">
22. <!--
23. <link rel="stylesheet" type="text/css" href="styles.css">
24. -->
25.26. </head>
27.28. <body bgcolor="#ffffff">
29. <%
30. try{
31. response.setContentType("text/html; charset=GBK");
32. HttpSession mysession = request.getSession();
33. ServletContext context = getServletContext();
34. ShopCart cart = (ShopCart) mysession.getAttribute("shopCart");
35. String action = request.getParameter("action");
36. if ("remove".equals(action)) {
37. String removeId = request.getParameter("removeId");
38. cart.removeProductFromCart(removeId);
39. } else if(action.equals("purchase")){
40. String[] productIds = request.getParameterValues("productId");
41.42. Map products = (Map) context.getAttribute("products");
43. if (cart == null) {
44. cart = new ShopCart();
45. mysession.setAttribute("shopCart", cart);
46. }
47. if (productIds == null) {
48. productIds = new String[0];
49. }
50. for (int i = 0; i < productIds.length; i++) {
51. Product product = (Product) products.get(productIds[i]);
52. cart.addProductToCart(product);
53. }
54. }
55. }catch(NullPointerException e)
56. {e.printStackTrace();}
57. %>
58. <jsp:forward page="/shopCart/ShowCartJSP.jsp"></jsp:forward>
59.60. </body>
61.</html>
ShopCartJSP.jsp:::::::::
1.<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
2.<%@ page import="shopcart.dto.*" %>
3.<%
4.String path = request.getContextPath();
5.String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
6.%>
7.8.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
9.<html>
10. <head>
11. <base href="<%=basePath%>">
12.
13. <title>My JSP 'ShowCartJSP.jsp' starting page</title>
14.
15. <meta http-equiv="pragma" content="no-cache">
16. <meta http-equiv="cache-control" content="no-cache">
17. <meta http-equiv="expires" content="0">
18. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
19. <meta http-equiv="description" content="This is my page">
20. <!--
21. <link rel="stylesheet" type="text/css" href="styles.css">
22. -->
23.24. </head>
25.
26. <body><%
27. HttpSession mysession = request.getSession();
28. ShopCart cart = (ShopCart) mysession.getAttribute("shopCart");
29. List products = null;
30. if (cart == null
31. || (products = cart.getAllProductsFromCart()) == null) {
32. %>
33.
34. <h1>
35. 你目前没有购买任何产品
36. </h1>
37.
38. <p>
39. <a href="/shopCart/ShowProductsJSP.jsp">返回产品显示页</a>
40. </p>
41. <%
42. } else {
43. Iterator iterator = products.iterator();
44. %>
45.
46. <h1>
47. 你目前购买的产品为：
48. </h1>
49.
50. <table border="1" cellspace="0">
51. <tr bgcolor="#CCCCCC">
52. <td>
53. 产品名称
54. </td>
55. <td>
56. 产品描述
57. </td>
58. <td>
59. 价格
60. </td>
61. <td>
62. 操作
63. </td>
64. </tr>
65. <%
66. while (iterator.hasNext()) {
67. Product productItem = (Product) iterator.next();
68. %>
69. <tr>
70. <td>
71. <%=productItem.getName()%>
72. </td>
73. <td><%=productItem.getDescription()%>
74. </td>
75. <td>
76. <%=productItem.getPrice()%></td>
77.78. <td>
79. <a
80. href="/helloApp/shopCart/ShoppingJSP.jsp?action=remove&removeId=<%=productItem.getId()%>">删除</a>
81. </td>
82. </tr>
83.84. <%
85. }
86. %>
87.88. </table>
89. <p>
90. 目前您购物车的总价格为：<%=cart.getAllProductPrice()%>
91. 元人民币。
92. </p>
93. <p>
94. </br>
95. <a href="/helloApp/shopCart/ShowProductsJSP.jsp">返回产品显示页</a>
96. </p>
97. <%
98. }
99. %>
100. </body>
101.</html>
最后打开Tomcat,在浏览器URL中输入http://localhost:8088/helloApp/shopCart/ShowProductsJSP.jsp
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/yi76263725/archive/2008/09/14/2860224.aspx
