JavaWeb_HttpSession之简易购物车

step1.jsp

<%--
  Created by IntelliJ IDEA.
  User: dell
  Date: 2019/7/10
  Time: 16:59
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h4>Step1:选择要购买的书籍</h4>
    <form action="<%=request.getContextPath()%>/Step1Servlet" method="post">
        <table 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>Strust</td>
                <td><input type="checkbox" name="book" value="Strust"></td>
            </tr>
            <tr>
                <td colspan="2">
                    <input type="submit" value="Submit">
                </td>
            </tr>
        </table>
    </form>
</body>
</html>

step1.jsp效果图：

Step1Servlet

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class Step1Servlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       //1.获取选中的图书的信息
        String [] books = req.getParameterValues("book");
        //2.把图书信息放入到HttpSession中
        req.getSession().setAttribute("books",books);

        //3.重定向页面到shopcart/step2.jsp
        resp.sendRedirect(req.getContextPath() + "/shopcart/step2.jsp");
    }
}

　　

Step2.jsp

<%--
  Created by IntelliJ IDEA.
  User: dell
  Date: 2019/7/10
  Time: 17:03
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h4>Step2:请输入寄送地址与信用卡信息</h4>
<form action="<%=request.getContextPath()%>/Step2Servlet" method="post">
    <table cellpadding="10" cellspacing="0" border="1">
        <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>寄送地址：</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="card">
            </td>
        </tr>
        <tr>
            <td colspan="2"><input type="submit" value="Submit"></td>
        </tr>
    </table>
</form>
</body>
</html>

　　

step2.jsp效果图

Step2Servlet

import com.demo.javaweb.Customer;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class Step2Servlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求参数
        String address = req.getParameter("address");
        byte [] bytes1 = address.getBytes("ISO8859-1");
        address = new String(bytes1,"UTF-8");
        String name = req.getParameter("name");
        byte [] bytes2 = name.getBytes("ISO8859-1");
        name = new String(bytes2,"UTF-8");


        Customer customer = new Customer();
        customer.setName(name);
        customer.setAddress(address);
        customer.setCardType(req.getParameter("cardType"));
        customer.setCard(req.getParameter("card"));


        HttpSession session = req.getSession();
        System.out.println(customer);
        session.setAttribute("customer",customer);

        resp.sendRedirect(req.getContextPath()+"/shopcart/submit.jsp");
    }
}

　　

submit.jsp

<%--
  Created by IntelliJ IDEA.
  User: dell
  Date: 2019/7/10
  Time: 17:12
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" import="com.demo.javaweb.Customer" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    Customer customer = (Customer) session.getAttribute("customer");
    String[] books = (String[]) session.getAttribute("books");
%>
<table cellspacing="0" cellpadding="10" border="1">
    <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>种类：</td>
        <td><%= customer.getCardType()%></td>
    </tr>
    <tr>
        <td>卡号：</td>
        <td><%= customer.getCard()%></td>
    </tr>
    <tr>
        <td>BOOKS:</td>
        <td>
            <%
                for (String book:books
                     ) {
                    out.print(book);
                    out.print("<br>");
                }
            %>
        </td>
    </tr>
</table>
</body>
</html>

　　

submit.jsp效果图

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原文地址：https://www.cnblogs.com/yangHS/p/11169764.html