Implement the shopping cart for users for the online shopping. Apply the concept of session

Practical:3

Implement the shopping cart for users for the online shopping. Apply the concept of session

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Product.java

package com.demo.entities;

public class Product {

private String id;

private String name;

private double price;

private String photo;

public Product() {

}

public Product(String id, String name, String photo, double price) {

this.id = id;

this.name = name;

this.price = price;

this.photo = photo;

}

public String getId() {

return id;

}

public void setId(String id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

this.price = price;

}

public String getPhoto() {

return photo;

}

public void setPhoto(String photo) {

this.photo = photo;

}

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item.java

package com.demo.entities;

public class Item {

private Product product;

private int quantity;

public Item() {

}

public Item(Product product, int quantity) {

this.product = product;

this.quantity = quantity;

}

public Product getProduct() {

return product;

}

public void setProduct(Product product) {

this.product = product;

}

public int getQuantity() {

return quantity;

}

public void setQuantity(int quantity) {

this.quantity = quantity;

}

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product servlet

package com.demo.servlets;

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;

import com.demo.models.ProductModel;

@WebServlet("/product")

public class ProductServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

public ProductServlet() {

super();

}

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

ProductModel productModel = new ProductModel();

request.setAttribute("products", productModel.findAll());

request.getRequestDispatcher("product/index.jsp").forward(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

}

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cart servlet

package com.demo.servlets;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import com.demo.entities.Item;

import com.demo.models.ProductModel;

@WebServlet("/cart")

public class CartServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

public CartServlet() {

super();

}

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

String action = request.getParameter("action");

if (action == null) {

doGet_DisplayCart(request, response);

} else {

if (action.equalsIgnoreCase("buy")) {

doGet_Buy(request, response);

} else if (action.equalsIgnoreCase("remove")) {

doGet_Remove(request, response);

}

protected void doGet_DisplayCart(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

request.getRequestDispatcher("cart/index.jsp").forward(request, response);

}

protected void doGet_Remove(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

HttpSession session = request.getSession();

List<Item> cart = (List<Item>) session.getAttribute("cart");

int index = isExisting(request.getParameter("id"), cart);

cart.remove(index);

session.setAttribute("cart", cart);

response.sendRedirect("cart");

}

protected void doGet_Buy(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

ProductModel productModel = new ProductModel();

HttpSession session = request.getSession();

if (session.getAttribute("cart") == null) {

List<Item> cart = new ArrayList<Item>();

cart.add(new Item(productModel.find(request.getParameter("id")), 1));

session.setAttribute("cart", cart);

} else {

List<Item> cart = (List<Item>) session.getAttribute("cart");

int index = isExisting(request.getParameter("id"), cart);

if (index == -1) { cart.add(newItem(productModel.find(request.getParameter("id")), 1));

}

else {

int quantity = cart.get(index).getQuantity() + 1; cart.get(index).setQuantity(quantity);

}

session.setAttribute("cart", cart);

}

response.sendRedirect("cart");

}

private int isExisting(String id, List<Item> cart) {

for (int i = 0;i<cart.size();i++)

{

if (cart.get(i).getProduct().getId().equalsIgnoreCase(id)) {

return i;

}

return -1;

}

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

}

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cart servlet

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

pageEncoding="ISO-8859-1" isELIgnored="false"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<html>

<head>

<title>Product Page</title>

</head>

<body>

<tr>

<th>Photo</th>

<th>Price</th>

</tr>

<c:forEach var="product" items="${products }">

<tr>

<td>${product.id }</td>

<td>${product.name }</td>

<td>

</td>

<td>${product.price }</td>

</td>

</tr>

</c:forEach>

</table>

</body>

</html>

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Create cart page

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

pageEncoding="ISO-8859-1" isELIgnored="false"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<html>

<head>

</head>

<body>

<tr>

<th>Option</th>

<th>Photo</th>

<th>Price</th>

<th>Quantity</th>

<th>Sub Total</th>

</tr>

<c:set var="total" value="0"></c:set>

<c:forEach var="item" items="${sessionScope.cart }">

<c:set var="total" value="${total + item.product.price * item.quantity }"></c:set>

<tr>

<a href="${pageContext.request.contextPath}/cart?action=remove&id=${item.product.id }"onclick="return confirm('Are you sure?')">Remove</a>

</td>

<td>${item.product.id }</td>

<td>${item.product.name }</td>

<td>

</td>

<td>${item.product.price }</td>

<td>${item.quantity }</td>

<td>${item.product.price * item.quantity }</td>

</tr>

</c:forEach>

<tr>

<td colspan="6" align="right">Total</td>

<td>${total }</td>

</tr>

</table>

<br>

<a href="${pageContext.request.contextPath }/product">Continue Shopping</a>

</body>

</html>

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Implement the shopping cart for users for the online shopping. Apply the concept of session

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