Jboss Ejb3.0 Statefull Bean

这个例子结合了j2se5.0的generis新特性，可以先看下我写的J2se5.0 generis新特性



 































ShoppingCart.java











package org.jboss.tutorial.stateful.bean;



import javax.ejb.Remote;











import javax.ejb.Remove;



import java.util.HashMap;



@Remote











public interface ShoppingCart











{











   void buy(String product, int quantity);



   HashMap<String, Integer> getCartContents();



   @Remove void checkout();











} 




 


 



 



ShoppingCartBean.java











package org.jboss.tutorial.stateful.bean;



import javax.ejb.Remove;











import javax.ejb.Stateful;



import java.util.HashMap;











import java.io.Serializable;



@Stateful











public class ShoppingCartBean implements ShoppingCart, Serializable











{











   private HashMap<String, Integer> cart = new HashMap<String, Integer>();



   public void buy(String product, int quantity)











   {











      if (cart.containsKey(product))











      {











         int currq = cart.get(product);











         currq += quantity;











         cart.put(product, currq);











      }











      else











      {











         cart.put(product, quantity);











      }











   }



   public HashMap<String, Integer> getCartContents()











   {











      return cart;











   } 



   @Remove











   public void checkout()











   {











      System.out.println("To be implemented");











   }











}




 


 



 



Client.java











package org.jboss.tutorial.stateful.client; 



import org.jboss.tutorial.stateful.bean.ShoppingCart;



import javax.ejb.EJBException;











import javax.naming.InitialContext;



import java.rmi.NoSuchObjectException;











import java.util.HashMap;



















public class Client











{











   public static void main(String[] args) throws Exception











   {











      InitialContext ctx = new InitialContext();











      ShoppingCart cart = (ShoppingCart) ctx.lookup(ShoppingCart.class.getName());



      System.out.println("Buying 1 memory stick");











      cart.buy("Memory stick", 1);











      System.out.println("Buying another memory stick");











      cart.buy("Memory stick", 1);



      System.out.println("Buying a laptop");











      cart.buy("Laptop", 1);



      System.out.println("Print cart:");











      HashMap<String, Integer> fullCart = cart.getCartContents();











      for (String product : fullCart.keySet())











      {











         System.out.println(fullCart.get(product) + "     " +