Session案例：简易的购物车

三个jsp和两个Servlet组成：在WebContent下边建立一个shoppingcart文件夹，将三个jsp文件放在里面：

1.建立一个step1.jsp文件，出现一个表格，是一个复选框，可以选择要购买的书籍，完毕后，点击Submit,跳转到Servlet类 ProcessStep1Servlet里面

<%@ 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>

    <h2>step1: 选择要购买的书籍！</h2>

    <form action="<%= request.getContextPath() %>/processStep1Servlet" method="post">

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

            <tr>

                <th>书名</th>

                <th>点击购买</th>

            </tr>    

            <tr>

                <td>Oracle</td>

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

            </tr>

            <tr>

                <td>java</td>

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

            </tr>

            <tr>

                <td>C++</td>

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

            </tr>

            <tr>

                <td>mysql</td>

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

            </tr>

            <tr>

                <td>WEB</td>

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

            </tr>

            <tr>

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

            </tr>

        </table>

    </form>

</body>

</html>

2.建立一个Servlet类 ProcessStep1Servlet，里面有doPost方法，可实现session方法（好处就是获取用户选择书名的id,保存到后边再使用），获取用户选择的书名，使绝对路径的方法重定向到step1.jsp页面； response.sendRedirect(request.getContextPath()+"/shoppingcart/step2.jsp");

public class ProcessStep1Servlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
　　//1. 获取选中的图书的信息
　　String [] books = request.getParameterValues("book");
　　//2. 把图书信息放入到 HttpSession 中
　　request.getSession().setAttribute("books", books);

　　//2. 重定向页面到 shoppingcart/step-2.jsp
　　System.out.println(request.getContextPath() + "/shoppingcart/step-2.jsp");
　　response.sendRedirect(request.getContextPath() + "/shoppingcart/step-2.jsp");
　　}

}

3.在step2.jsp页面，是用户输入个人信息页面，付款，发送货物需要的信息，然后跳转到Servlet类 processStep2Servlet 对用户的信息封装到customer类里面

<%@ 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>

    <h2>step2: 请输入寄送地址和信用卡</h2>

    <form action="<%= request.getContextPath() %>/processStep2Servlet" method="post">

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

            <tr>

                <td colspan="2">寄送信息：</td>

            </tr>

            <tr>

                <td>姓名：</td>

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

            </tr>

            <tr>

                <td>地址：</td>

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

            </tr>

            <tr>

                <td>联系电话：</td>

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

            </tr>

            <tr >

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

            </tr>

            <tr>

                <td>信用卡种类</td>

                <td>

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

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

                </td>

            </tr>

            <tr>

                <td>信用卡号：</td>

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

            </tr>

            <tr>

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

            </tr>

        </table>

    </form>

</body>

</html>

4.建立一个Servlet类，里面有doPost方法，对用户的信息封装到customer类里面，session实例，保存用户的id信息，便于后边输出，然后重定向到confirm.jsp页面，跳转一面使用了绝对路径：response.sendRedirect(request.getContextPath()+"/shoppingcart/confirm.jsp");

public class ProcessStep2Servlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

　　//1. 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");

　　Customer customer = new Customer(name, address, cardType, card);

　　//2. 把请求信息存入到 HttpSession 中

　　HttpSession session = request.getSession();
　　session.setAttribute("customer", customer);

　　//3. 重定向页面到 confirm.jsp
　　response.sendRedirect(request.getContextPath() + "/shoppingcart/confirm.jsp");
　　}

}

5.confirm.jsp页面，使用了session实例，将前边的用户选择的书籍和用户输入的个人信息，输出到这个页面

<%@page import="com.lanqiao.javatest.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>

    <%

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

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

    %>

     <h2>信息表单</h2>

    <table>

        <tr>

            <td>顾客姓名：</td>

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

        </tr>

        <tr>

            <td>顾客地址：</td>

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

        </tr>

        <tr>

            <td>顾客联系电话：</td>

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

        </tr>

        <tr>

            <td>顾客卡类型：</td>

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

        </tr>

        <tr>

            <td>顾客的卡号：</td>

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

        </tr>

        <tr>

            <td>您购买的书：</td>

            <td>

                <%

                    for(String book:books){

                        out.print(book);

                        out.print("\t\t");

                    }

                %>

            </td>

        </tr>

    </table>

</body>

</html>

6.lib下边的web.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

  <servlet>

    <description></description>

    <display-name>ProcessStep1Servlet</display-name>

    <servlet-name>ProcessStep1Servlet</servlet-name>

    <servlet-class>com.lanqiao.javatest.ProcessStep1Servlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>ProcessStep1Servlet</servlet-name>

    <url-pattern>/processStep1Servlet</url-pattern>

  </servlet-mapping>

  <servlet>

    <description></description>

    <display-name>ProcessStep2Servlet</display-name>

    <servlet-name>ProcessStep2Servlet</servlet-name>

    <servlet-class>com.lanqiao.javatest.ProcessStep2Servlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>ProcessStep2Servlet</servlet-name>

    <url-pattern>/processStep2Servlet</url-pattern>

  </servlet-mapping>

</web-app>

7.Customer封装类：

package com.lanqiao.javatest;

public class Customer {

    private String name;

    private String address;

    private String phone;

    private String cardType;

    private String card;

    public Customer() {

        super();

    }

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

        super();

        this.name = name;

        this.address = address;

        this.phone = phone;

        this.cardType = cardType;

        this.card = 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 getPhone() {

        return phone;

    }

    public void setPhone(String phone) {

        this.phone = phone;

    }

    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;

    }

    @Override

    public String toString() {

        return "Customer [name=" + name + ", address=" + address + ", phone=" + phone + ", cardType=" + cardType

                + ", card=" + card + "]";

    }

}

巴特西

Session案例：简易的购物车

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