cartbean.java

主要是对EJB的提供的组件功能进行了介绍。还包括了案例~ 里面提供EJB ppt 会话Bean教案例子 实体Bean教案例子 实体EJB关系教案例子 CMP教案.ppt 消息驱动Bean教

package cartproject;

import javax.ejb.*;
import java.rmi.*;
import javax.ejb.*;
import java.lang.*;
import java.util.*;
import java.io.Serializable;

public class cartBean implements SessionBean {
  SessionContext sessionContext;
  java.lang.String cardHolderName;
  java.util.Vector items =new java.util.Vector();
  java.lang.String creditCardNumber;
  public void ejbCreate(String _cardHolderName, String _creditCardNumber) throws CreateException {
    cardHolderName = _cardHolderName;
  creditCardNumber = _creditCardNumber;
}
  public void ejbRemove() {

  }
  public void ejbActivate() {

  }
  public void ejbPassivate() {

  }
  public void setSessionContext(SessionContext sessionContext) {
    this.sessionContext = sessionContext;
  }
  /**
   * 添加商品
   * @param item
   */
  public void addItem(Item item) {
    System.out.println("\taddItem(" + item.getTitle() + "): " + this);
     items.addElement(item);
   }
  /**
   * 从商品列表中删除指定的商品
   * @param item
   */
  public void removeItem(Item item) {
    System.out.println("\tremoveItem(" + item.getTitle() + "): " + this);
     Enumeration elements = items.elements();
     while(elements.hasMoreElements())
     {
       Item current = (Item) elements.nextElement();

       if(item.getClass().equals(current.getClass()) &&  item.getTitle().equals(current.getTitle()))
       {
          items.removeElement(current);
          return;
       }
     }
  }
  /**
   * 计算商品的总价
   * @return
   */
  public float getTotalPrice() {
    System.out.println("\tgetTotalPrice(): " + this);
    float totalPrice = 0f;
    Enumeration elements = items.elements();
    while(elements.hasMoreElements())
    {
      Item current = (Item) elements.nextElement();
      totalPrice += current.getPrice();
    }
    return (long) (totalPrice * 100) / 100f;

  }
  /**
   * 完成购买
   */
  public void purchase() {
   System.out.println("\tpurchase(): " + this);
  }
}