Jboss Ejb3.0 Statefull Bean
类别: JAVA教程 
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);
}
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rosonsandy@yahoo.com.cn，标题写csdn就行了，希望能做些什么。
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