HttpSession之简易购物车

时间：2024-09-26 22:37:45

创建一个简单的购物车模型，由三个 jsp 和两个 Servlet 组成：

HttpSession之简易购物车

step1.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

    <h3>Step1：选择要购买的图书</h3>

    <form action="<%=request.getContextPath() %>/processStep1" method="post">

        <table cellpadding="10" cellspacing="0" border="1">

            <tr>

                <td>书名</td>

                <td>购买</td>

            </tr>

            <tr>

                <td>Java</td>

                <td><input type="checkbox" name="book" value="Java"/></td>

            </tr>

            <tr>

                <td>Oracle</td>

                <td><input type="checkbox" name="book" value="Oracle"/></td>

            </tr>

            <tr>

                <td>Struts</td>

                <td><input type="checkbox" name="book" value="Struts"/></td>

            </tr>

            <tr>

                <td colspan="2"><input type="submit"  value="Submit"/></td>

            </tr>

        </table>

    </form>

</body>

</html>

ProcessStep1Servlet

package com.aff.javaweb;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet("/processStep1")

public class ProcessStep1Servlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        // 获取选中的图书信息

        String[] books = request.getParameterValues("book");// 多个book 放在数组中

        // 把图书信息放入到HttpSession中

        request.getSession().setAttribute("books", books);

        // 重定向页面到shoppingcart/step2.jsp

        // response.sendRedirect("step2.jsp");//这个为相对路径，在同一目录下没问题的

        System.out.println(request.getContextPath() + "/shoppingcart/step2.jsp");///WebCookieT5/shoppingcart/step2.jsp

        response.sendRedirect(request.getContextPath() + "/shoppingcart/step2.jsp");// 绝对路径

    }

}

step2.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

    <h3>Step2: 请输入寄送地址和信用卡信息</h3>

    <form action="<%=request.getContextPath() %>/processStep2" method="post">

        <table cellpadding="10" cellspacing="0" border="1">

            <tr>

                <td colspan="2">基本信息</td>

            </tr>

            <tr>

                <td>姓名</td>

                <td><input type="text" name="name" /></td>

            </tr>

            <tr>

                <td>寄送地址</td>

                <td><input type="text" name="address" /></td>

            </tr>

            <tr>

                <td colspan="2">寄送信用卡信息</td>

            </tr>

            <tr>

                <td >种类</td>

                <td >

                <input type="radio" name="cardType" value="visa" />Visa

                <input type="radio" name="cardType" value="Master" />Master

                </td>

            </tr>

            <tr>

                <td>卡号</td>

                <td><input type="text" name="card"/></td>

            </tr>

            <tr>

                <td colspan="2"><input type="submit" value="Submit" /></td>

            </tr>

        </table>

    </form>

</body>

</html>

ProcessStep2Servlet

package com.aff.javaweb;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet("/processStep2")

public class ProcessStep2Servlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        // 获取请求参数 name address cardType card

        String name = request.getParameter("name");

        String address = request.getParameter("address");

        String cardType = request.getParameter("cardType");

        String card = request.getParameter("card");

        // 把上面四个属性封装成一个对象，方便很多

        Customer customer = new Customer(name, address, cardType, card);
        // 把请求信息传入到HttpSession中

        request.getSession().setAttribute("customer", customer);

        // 重定向页面到confirm.jsp

        response.sendRedirect(request.getContextPath() + "/shoppingcart/confirm.jsp");

    }

}

confirm.jsp

<%@page import="com.aff.javaweb.Customer"%>

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

    <%

        //把之前放入session中的customer对象获取过来

        Customer customer = (Customer) session.getAttribute("customer");

        String[] books = (String[]) session.getAttribute("books");

    %>

    <table bor>

        <tr>

            <td>顾客姓名:</td>

            <td><%=customer.getName()%></td>

        </tr>

        <tr>

            <td>地址:</td>

            <td><%=customer.getAddress()%></td>

        </tr>

        <tr>

            <td>卡号:</td>

            <td><%=customer.getCard()%></td>

        </tr>

        <tr>

            <td>卡的类型:</td>

            <td><%=customer.getCardType()%></td>

        </tr>

        <tr>

            <td>Books:</td>

            <td>

                <%

                    for (String book : books) {

                        out.print(book);

                        out.print("<br>");

                    }

                %>

            </td>

        </tr>

    </table>

</body>

</html>
Customer
package com.aff.javaweb;

public class Customer {

    private String name;

    private String address;

    private String cardType;

    private String card;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getAddress() {

        return address;

    }

    public void setAddress(String address) {

        this.address = address;

    }

    public String getCardType() {

        return cardType;

    }

    public void setCardType(String cardType) {

        this.cardType = cardType;

    }

    public String getCard() {

        return card;

    }

    public void setCard(String card) {

        this.card = card;

    }

    public Customer() {

        super();

        // TODO Auto-generated constructor stub

    }

    public Customer(String name, String address, String cardType, String card) {

        super();

        this.name = name;

        this.address = address;

        this.cardType = cardType;

        this.card = card;

    }

    @Override

    public String toString() {

        return "Customer [name=" + name + ", address=" + address + ", cardType=" + cardType + ", card=" + card + "]";

    }

}

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