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Need Help Badly on Shopping Cart Using JSP And Java Servlet

843836Mar 28 2004 — edited Mar 29 2004

Hi All,
This is the 1st time i am trying to create a shopping cart using JSP and Servlet.
I have read through a few acticles but i still do not get the whole idea of how it works.
Please guide me as i need help very badly.
Thanks.

This is one of the jsp page which displays the category of products user would like to buy : Products.jsp

<html>
<head>
<title>Purchase Order</title>
</head>
<body topmargin="30">
<table border="0" width="100%" id="table1" cellpadding="2">
<tr>
<td bgcolor="#990000" width="96">

Code</td>
<td bgcolor="#990000" width="260">

Description </td>
<td bgcolor="#990000" width="130">
Brand
</td>
<td bgcolor="#990000" width="146">
UOM
</td>
<td bgcolor="#990000" width="57">
Unit 
Price </td>
<td bgcolor="#990000" width="62">

Carton 
Price </td>
<td bgcolor="#990000" width="36">

Qty</td>
<td bgcolor="#990000" width="65">
Add 
To Cart</td>
</tr>
<tr>
<td align="center" width="96" bgcolor="#CCCCCC">
123
</td>
<td align="center" width="260" bgcolor="#CCCCCC">
Tom Yam
</td>
<td align="center" width="130" bgcolor="#CCCCCC">
Nissin
</td>
<td align="center" width="146" bgcolor="#CCCCCC">
12 x 10's
</td>
<td align="center" width="57" bgcolor="#CCCCCC">
$3.85
</td>
<td align="center" width="62" bgcolor="#CCCCCC">
$46.2
</td>
<td align="center" width="36" bgcolor="#CCCCCC">

<input type="Integer" name="Q10005" size="1">
</td>
<td align="center" width="65" bgcolor="#CCCCCC">
<input type="checkbox" name="checkbox" value="123">
</tr>
<tr>
</table>
<table border="0" width="100%" id="table2">
<tr>
<td>
<div align="right">
<input type="hidden" name="hAction" value="AddToCart"/> 
<input type=submit name="submit" value="Add To Cart"/> 
</div>
</td>
</tr>
</table>
</body>
</html>

After user has make his selection by entering the qty and ticking on the check box, he would click the "Add To Cart" button ... and this would call my servlet : AddToAddControlSerlvet.java

import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
import java.util.*;
import java.util.ArrayList;

public class AddToCartControlServlet extends HttpServlet
{

public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,IOException
{
String action = req.getParameter("hAction");
if (action.equals("AddToCart"))
{
addToCart(req,res);
}
}

public void addToCart(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
{
try
{
String url = "";
String[] addList = req.getParameterValues("checkbox");
HttpSession sess = req.getSession(true);
//String sessionID = sess.getId();
DBClass dbClass = new DBClass();
ArrayList cartList = new ArrayList();
for (int i = 0; i < addList.length; i++)
{
String productCode = (String)addList;
int qty = Integer.parseInt(req.getParameter("Q"+productCode));
Products product = dbClass.getProductDetail(productCode);
double totalUnitAmt = qty * product.getUnitPrice();
double totalCartonAmt = qty * product.getCartonPrice();
Order order = new Order(product.getProductCode(),product.getProductDesc(),product.getBrandName(),product.getUom(),qty,product.getUnitPrice(),product.getCartonPrice(),totalUnitAmt,totalCartonAmt);
cartList.add(order);
}
sess.setAttribute("cartList", cartList);
url = "/Cart/CartDetails.jsp";

ServletContext sc = getServletContext();
RequestDispatcher rd = sc.getRequestDispatcher(url);
rd.forward(req, res);
}
catch (Exception e)
{
System.out.println(e);
}
}
}
From here, i would get the list of items which user has selected and add to the cartList, then i would direct the user to CartDetails.jsp which displayed the items user has selected.
From there, user would be able to remove or to continue shopping by selecting other category.
How i do store all the items user has selected ... everytime he would wan to view his cart ...
As i would be calling from jsp to servlet .. or jsp to servlet ... and i do not know how i should go about in creating the shopping cart.

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Locked on Apr 26 2004

Added on Mar 28 2004

#javaserver-pages-jsp-and-jstl

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