Online Shopping System in Java using JSP & Servlets

				
					import java.util.ArrayList;
public class CartBean {
private ArrayList alCartItems = new ArrayList();
private double dblOrderTotal ;

public int getLineItemCount() {
 return alCartItems.size();
}

public void deleteCartItem(String strItemIndex) {
 int iItemIndex = 0;
 try {
 iItemIndex = Integer.parseInt(strItemIndex);
 alCartItems.remove(iItemIndex - 1);
 calculateOrderTotal();
 } catch(NumberFormatException nfe) {
 System.out.println("Error while deleting cart item: "+nfe.getMessage());
 nfe.printStackTrace();
 }
}

public void updateCartItem(String strItemIndex, String strQuantity) {
 double dblTotalCost = 0.0;
 double dblUnitCost = 0.0;
 int iQuantity = 0;
 int iItemIndex = 0;
 CartItemBean cartItem = null;
 try {
 iItemIndex = Integer.parseInt(strItemIndex);
 iQuantity = Integer.parseInt(strQuantity);
 if(iQuantity>0) {
 cartItem = (CartItemBean)alCartItems.get(iItemIndex-1);
 dblUnitCost = cartItem.getUnitCost();
 dblTotalCost = dblUnitCost*iQuantity;
 cartItem.setQuantity(iQuantity);
 cartItem.setTotalCost(dblTotalCost);
 calculateOrderTotal();
 }
 } catch (NumberFormatException nfe) {
 System.out.println("Error while updating cart: "+nfe.getMessage());
 nfe.printStackTrace();
 }

}

public void addCartItem(String strModelNo, String strDescription,
String strUnitCost, String strQuantity) {
 double dblTotalCost = 0.0;
 double dblUnitCost = 0.0;
 int iQuantity = 0;
 CartItemBean cartItem = new CartItemBean();
 try {
 dblUnitCost = Double.parseDouble(strUnitCost);
 iQuantity = Integer.parseInt(strQuantity);
 if(iQuantity>0) {
 dblTotalCost = dblUnitCost*iQuantity;
 cartItem.setPartNumber(strModelNo);
 cartItem.setModelDescription(strDescription);
 cartItem.setUnitCost(dblUnitCost);
 cartItem.setQuantity(iQuantity);
 cartItem.setTotalCost(dblTotalCost);
 alCartItems.add(cartItem);
 calculateOrderTotal();
 }

 } catch (NumberFormatException nfe) {
 System.out.println("Error while parsing from String to primitive types: "+nfe.getMessage());
 nfe.printStackTrace();
 }
}

public void addCartItem(CartItemBean cartItem) {
 alCartItems.add(cartItem);
}

public CartItemBean getCartItem(int iItemIndex) {
 CartItemBean cartItem = null;
 if(alCartItems.size()>iItemIndex) {
 cartItem = (CartItemBean) alCartItems.get(iItemIndex);
 }
 return cartItem;
}

public ArrayList getCartItems() {
 return alCartItems;
}
public void setCartItems(ArrayList alCartItems) {
 this.alCartItems = alCartItems;
}
public double getOrderTotal() {
 return dblOrderTotal;
}
public void setOrderTotal(double dblOrderTotal) {
 this.dblOrderTotal = dblOrderTotal;
}

protected void calculateOrderTotal() {
 double dblTotal = 0;
 for(int counter=0;counter<alCartItems.size();counter++) {
 CartItemBean cartItem = (CartItemBean) alCartItems.get(counter);
 dblTotal+=cartItem.getTotalCost();

 }
 setOrderTotal(dblTotal);
}
}