Session机制二（简易购物车案例）
一：案例一（简易购物车）
1.目录结构
2.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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h2>Step1：选择要购买的图书</h2>
<form action="<%=request.getContextPath() %>/processStep1" method="post">
<table border="1" cellpadding="10" cellspacing="0">
<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>Struct2</td>
<td><input type="checkbox" name="book" value="Struct2"></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="Submit"/>
</td>
</tr>
</table>
</form>
</body>
</html>
3.ProcessStep1Servlet.java
package 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; /**
* Servlet implementation class ProcessStep1Servlet
*/
@WebServlet("/processStep1")
public class ProcessStep1Servlet extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取选中的图书的信息
String[] books=request.getParameterValues("book"); //将图书放进HttpSession中
request.getSession().setAttribute("books", books); //重定向页面到shopcart/step2.jsp
//这里使用的绝对路径，同理，在jsp里也需要使用相对路径
response.sendRedirect(request.getContextPath()+"/shopCart/step2.jsp");
} }
4.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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h2>Step2:请输入信用卡的信息</h2>
<form action="<%=request.getContextPath()%>/processStep2" 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 colspan="2">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="cardNum" /></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="Submit" /></td>
</tr>
</table>
</form>
</body>
</html><%@ 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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h2>Step2:请输入信用卡的信息</h2>
<form action="<%=request.getContextPath()%>/processStep2" 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 colspan="2">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="cardNum" /></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="Submit" /></td>
</tr>
</table>
</form>
</body>
</html>
5.ProcessStep2Servlet.java
package 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; /**
* Servlet implementation class ProcessStep2Servlet
*/
@WebServlet("/processStep2")
public class ProcessStep2Servlet extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取请求参数name address cardType cardNum
String name=request.getParameter("name");
String address=request.getParameter("address");
String cardType=request.getParameter("cardType");
String cardNum=request.getParameter("cardNum"); //将参入放进一个对象中
Customer customer=new Customer(name, address, cardType, cardNum); //将请求信息存入HtppSession中
request.getSession().setAttribute("customer", customer); //重定向到confirm.jsp
response.sendRedirect(request.getContextPath()+"/shopCart/confirm.jsp");
} }
6.conform.jsp
<%@page import="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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
Customer customer=(Customer)session.getAttribute("customer");
String[] books=(String[])session.getAttribute("books");
%>
<h2>Step3:请确认</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>顾客卡号</td>
<td><%=customer.getCardNum() %></td>
</tr>
<tr>
<td>顾客类型</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>
7.补充简单bean，Customer.java
package javaweb;
public class Customer {
private String name;
private String address;
private String cardType;
private String cardNum;
public Customer() {
}
public Customer(String name, String address, String cardType, String cardNum) {
super();
this.name = name;
this.address = address;
this.cardType = cardType;
this.cardNum = cardNum;
}
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 getCardNum() {
return cardNum;
}
public void setCardNum(String cardNum) {
this.cardNum = cardNum;
}
}
8.展示结果
二：
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