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

http://www.gaodaima.com/40447.htmlJboss EJB3.0 Statefull Bean

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);

      }

      System.out.println("Checkout");

      cart.checkout();

      System.out.println("Should throw an object not found exception by invoking on cart after @Remove method");

      try

      {

         cart.getCartContents();

      }

      catch (EJBException e)

      {

         if (e.getCausedByException() instanceof NoSuchObjectException)

            System.out.println("Successfully caught no such object exception.");

         else

            throw e;

      }

   }

}

这里附上log4j.properties 在jboss-EJB-3.0_Preview_5.zip　里面没有这个老是显示缺少appender。有了这个将在该目录下生成个record.log日志文件。

log4j.properties

log4j.appender.R=org.apache.log4j.RollingFileAppender

log4j.appender.R.File=record.log

log4j.appender.R.layout=org.apache.log4j.PatternLayout

log4j.appender.R.layout.ConversionPattern=%p  %d{hh:mm:ss} %t %c{1} -%m%n

log4j.appender.R.MaxBackupIndex=1

log4j.appender.R.MaxFileSize=100KB

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) -%m%n

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.rootLogger=stdout,R 

运行：参考installing.html

Windows下

打开命令提示符cmd，到  jboss_home/bin

 Run.bat –c all

用ant

先build后run 就行了。

讨论：

这里的问题也不大吧。主要是熟悉j2se5.0的generis .在写这篇文章和entity的时候

是学jboss-EJB-3.0_Preview_5.zip之后隔了一段时间写的，可能有些地方会不清楚。有问题可以发我邮箱[email protected]，标题写csdn就行了，希望能做些什么。

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