EJB sessionBean实例(JBoss和两台电脑)

关于JBOSS 在两台电脑上布置EJB，一台作为SERVER，一台做为CLIENT的简单sample.
1首先启动 jboss :run -b 192.168.1.4 run.bat 这样可以启动server并绑定SERVER IP。
2在 server电脑上写以下代码。

一个EJB远程接口

import java.rmi.RemoteException;
import javax.ejb.*;

public interface Converter extends EJBObject {
   public double dollarToYen(double dollars) throws RemoteException;
   public double yenToEuro(double yen) throws RemoteException;

   // Simple example.
   public String helloEcho(String word) throws RemoteException;
}

一个EJB session bean

import java.rmi.RemoteException;
import javax.ejb.*;

public class ConverterEJB implements SessionBean {

   private static final long serialVersionUID = 1L;

   public double dollarToYen(double dollars) {
       return dollars * 121.6000;
   }

   public double yenToEuro(double yen) {
       return yen * 0.0077;
   }

   public String helloEcho(String word) {
       System.out.println("Someone called 'Hello Echo Successed!'");
       return "*********" + word + "*********";
   }

   public void ejbCreate() {
       System.out.println("Ejb 4 is creating!...");
   }

   public void ejbPostCreate() {
   }

   public void ejbActivate() throws EJBException, RemoteException {
   }

   public void ejbPassivate() throws EJBException, RemoteException {
   }

   public void ejbRemove() throws EJBException, RemoteException {
   }

   public void setSessionContext(SessionContext arg0) throws EJBException,
   RemoteException {
   }

}

一个EJB远程 HOME

import java.rmi.RemoteException;

import javax.ejb.CreateException;
import javax.ejb.EJBHome;

public interface ConverterHome extends EJBHome {
   Converter create() throws CreateException, RemoteException;
}

然后在meta-inf目录下写个 ejb-jar.xml

引用

<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
version="2.1"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd">
<display-name>ConverJAR</display-name>
<enterprise-beans>
    <session>
      <display-name>ConverterEJB</display-name>
      <ejb-name>ConverterEJB</ejb-name>
      <home>ConverterHome</home>
      <remote>Converter</remote>
      <ejb-class>ConverterEJB</ejb-class>
      <session-type>Stateless</session-type>
      <transaction-type>Bean</transaction-type>
      <security-identity>
        <use-caller-identity/>
      </security-identity>
    </session>
</enterprise-beans>
</ejb-jar>

和jboss.xml

引用

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss PUBLIC "-//JBoss//DTD JBOSS 4.0//EN" "http://www.jboss.org/j2ee/dtd/jboss_4_0.dtd">
<jboss>
   <enterprise-beans>
       <session>
           <ejb-name>ConverterEJB</ejb-name>
           <jndi-name>MyConverter</jndi-name>
       </session>
   </enterprise-beans>
</jboss>

然后绑定 JNDI
jndi.properties

引用

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.provider.url=192.168.1.4:1099
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces

目录结构是

ejb_server
   |___src
         |___Converter.java,ConverterEJB,ConverterHome
         |___META-INF/ejb-jar.xml,jboss.xml
         |___jndi.properties

需要的jar有 jboss-j2ee.jar(一般也就是j2ee.jar)

 
3.CLIENT端

我在另一台电脑上写。
建立一个ejb_client 工程，
写个类

import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;


public class EJB_Client {
    public static void main(String[]args){
    	Properties pros=new Properties();
    	pros.setProperty("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
    	pros.setProperty("java.naming.provider.url", "jnp://192.168.1.4:1099");
    	try {
			Context context=new InitialContext(pros);
			Object objref=context.lookup("MyConverter");
			
			ConverterHome home=(ConverterHome)PortableRemoteObject.narrow(objref, ConverterHome.class);
			Converter currentConverter=home.create();
			System.out.println(currentConverter.dollarToYen(100));
    	} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
    }
}

需要的JAR包是 jbossall-client.jar包，
还有就是要调用的server端的远程接口，只用Converter,ConverterHome接口就可以，其他什么SESSION BEAN，什么配置文件都不要，也不用安装jboss


其它要注意的小知识
1.jboss 里，MarshalledValueEX 类在E:\development\jboss-4.2.0.GA\jbossall-client.jar里
2.不需要环境变量里jboss_home.
3.在JBOSS里，JNDI树查看 ：查找service=JNDIView ，进入该页面后点击 list方法，就会列出JBoss上所有的JNDI服务。