Jboss EJB 3.0--Stateless Beans
类别: JAVA教程 
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j2ee application
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