Session案例：简易的购物车
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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，使用相对路径的方法重定向到step1.jsp页面； response.sendRedirect(request.getContextPath()+"/shoppingcart/step2.jsp");
package com.lanqiao.javatest; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ProcessStep1Servlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //System.out.println("jflskdflasdk"); String [] books=request.getParameterValues("book"); request.getSession().setAttribute("books", books); //System.out.println(request.getContextPath() + "/shoppingcart/step2.jsp"); response.sendRedirect(request.getContextPath()+"/shoppingcart/step2.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 ，跳转一面使用了相对路径：response.sendRedirect(request.getContextPath()+"/shoppingcart/confirm.jsp");
package com.lanqiao.javatest; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class ProcessStep2Servlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name=request.getParameter("name"); String address=request.getParameter("address"); String phone=request.getParameter("phone"); String cardType=request.getParameter("cardType"); String card=request.getParameter("card"); Customer customer=new Customer(name,address,phone,cardType,card); //System.out.println("jiajai"); HttpSession session=request.getSession(); session.setAttribute("customer", customer); 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>
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