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) " " product);

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