Jboss Ejb3.0 Statefull Bean

王朝java/jsp·作者佚名  2006-01-31
窄屏简体版  字體: |||超大  

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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