cartbean.java

EJB 实例

package ejb;

import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.ejb.CreateException;
import java.util.Date;
import java.util.List;
import javax.ejb.EJBException;
import java.lang.Float;

public class CartBean implements SessionBean {
    SessionContext sessionContext;
    String _cardHolderName;
    String _creditCardNumber;
    Date _expirationDate;
    List _items;
    public void ejbCreate(String cardHolderName, String creditCardNumber,
                          Date expirationDate) throws CreateException {
        _cardHolderName = cardHolderName;
        _creditCardNumber = creditCardNumber;
        _expirationDate = expirationDate;
    }

    public void ejbRemove() {
    }

    public void ejbActivate() {
    }

    public void ejbPassivate() {
    }


    public void setSessionContext(SessionContext sessionContext) {
        this.sessionContext = sessionContext;
    }

    public void addItem(Item item) {
        System.out.println("\taddItem("+item.getTitle()+"):"+ this);
        _items.add(item);
    }

    public void removeItem(Item item) {
        System.out.println("\tremoveItem("+item.getTitle()+"):" + this);
        if(! _items.remove(item)){
            throw new EJBException("the item"+item.getTitle()+"is not in you cart.");
        }
    }

    public List  getContents() {
        System.out.println("\tgetContents():" + this);
        return _items;
    }

    public float getTotalPrice() {
        System.out.println("\tgetTotalPrice():"+ this);
        float totalPrice = 0f;
        for(int i=0, n=_items.size();i<n;i++){
            Item current = (Item) _items.get(i);
            totalPrice += current.getPrice();
        }
        return ((long) (totalPrice * 100))/100f;
    }

    public void purchase() throws EJBException{
        System.out.println("\tpurchase():" + this);
        Date today = new Date();
        if(_expirationDate.before(today)){
            throw new EJBException ("Excecption date:"+_expirationDate);
        }
        System.out.println("\tPurchasing not implemented yet!");
    }
}