zoukankan html css js c++ java

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("		");
                    }
                %>
            </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 + "]";
    }
    
    
}

查看全文

相关阅读:
汉语-词语：理解
 汉语-词语：头脑
 SELECT INTO
SELECT
scp
samba
rpmgraph
rpmdeps
rpmcache
rpmbuild

原文地址：https://www.cnblogs.com/lxnlxn/p/5823892.html