Jboss EJB 3.0--Stateless Beans

王朝java/jsp·作者佚名  2006-01-31
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Jboss EJB 3.0

Stateless Beans

Calculator.java // 计算器的接口:加、减

package org.jboss.tutorial.stateless.bean;

public interface Calculator

{

int add(int x, int y);

int subtract(int x, int y);

}

CalculatorBean.java

package org.jboss.tutorial.stateless.bean;

import javax.ejb.Stateless;

@Stateless //标记CalculatorBean 为 stateless bean,为本地和远程接口的实现

public class CalculatorBean implements CalculatorRemote, CalculatorLocal

{

public int add(int x, int y)

{

return x + y;

}

public int subtract(int x, int y)

{

return x - y;

}

}

CalculatorLocal.java

package org.jboss.tutorial.stateless.bean;

import javax.ejb.Local;

@Local //标记为本地接口,继承了计算器接口

public interface CalculatorLocal extends Calculator

{

}

CalculatorRemote.java

package org.jboss.tutorial.stateless.bean;

import javax.ejb.Remote;

@Remote //标记为远程接口,继承了计算器接口

public interface CalculatorRemote extends Calculator

{

}

客户端

Client.java

package org.jboss.tutorial.stateless.client;

import org.jboss.tutorial.stateless.bean.Calculator;

import org.jboss.tutorial.stateless.bean.CalculatorRemote;

import javax.naming.InitialContext;

public class Client

{

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

{

InitialContext ctx = new InitialContext();

//查找远程接口

Calculator calculator = (Calculator) ctx.lookup(CalculatorRemote.class.getName());

System.out.println("1 + 1 = " + calculator.add(1, 1));

System.out.println("1 - 1 = " + calculator.subtract(1, 1));

}

}

*****************************简化版********************************

只需三个程序即可实现StatelessBean功能。

Calculator.java

package org.jboss.tutorial.stateless.bean;

import javax.ejb.Remote;

@Remote //直接将计算器标记为远程接口

public interface Calculator

{

int add(int x, int y);

int subtract(int x, int y);

}

CalculatorBean.java

package org.jboss.tutorial.stateless.bean;

import javax.ejb.Stateless;

@Stateless

public class CalculatorBean implements Calculator //这里实现了计算器接口

{

public int add(int x, int y)

{

return x + y;

}

public int subtract(int x, int y)

{

return x - y;

}

}

客户端:

Client.java

package org.jboss.tutorial.stateless.client;

import org.jboss.tutorial.stateless.bean.Calculator;

import javax.naming.InitialContext;

public class Client

{

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

{

InitialContext ctx = new InitialContext();

Calculator calculator = (Calculator) ctx.lookup(Calculator.class.getName());

//只要查找标记为remote的接口就行了

System.out.println("1 + 1 = " + calculator.add(1, 1));

System.out.println("1 - 1 = " + calculator.subtract(1, 1));

}

}

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

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:

简化版是看到jboss-EJB-3.0_Preview_5.zip里面的statefull源码而改写的,在EJB spe 3.0说好像是删除了home这个接口,我觉得简化很多接口更方面,有效的开发j2eeapplication

 
 
 
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