package javax.ejb;
 import java.rmi.Remote;
 import java.rmi.RemoteException;
  
 public interface EJBHome extends Remote{
  public abstract EJBMetaData getEJBMetaData() throws RemoteException;
  public abstract HomeHandle getHomeHandle() throws RemoteException;
  public abstract void remove(Object obj) throws RemoteException,RemoveException;
  public abstract void remove(Handle handle) throws RemoteException,RemoveException;
 }

import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBHome;

public interface StatefulAccountHome extends EJBHome{
 public StatefulAccount create(double fund) throws RemoteException,CreateException;
}

 package javax.ejb;
 import java.rmi.Remote;
 import java.rmi.RemoteException;
  
 public interface EJBObject extends Remote{
   public abstract EJBHome getEJBHome() throws RemoteException;
   public abstract Handle getHandle() throws RemoteException;
   public abstract Object getPrimaryKey() throws RemoteException;
   public abstract boolean isIdentical(EJBObject ejbobject) throws RemoteException;
   public abstract void remove() throws RemoteException,RemoveException;
 }

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

public interface StatefulAccount extends EJBObject{
 public void addFunds(double fund) 
     throws RemoteException,InsufficientFundException;
 public void removeFunds(double fund) 
     throws RemoteException,InsufficientFundException;
 public double getBalance()
     throws RemoteException;   
}

public class InsufficientFundException extends java.lang.Exception{
        public InsufficientFundException(){super();}
        public InsufficientFundException(String msg){super(msg);}
}

package javax.ejb;
impot java.rmi.RemoteException;

public interface SessionBean extends EnterpriseBean{
  public void setSessionContext(SessionContext ctx) throws EJBException,RemoteException;
public void ejbRemove() throws EJBException,RemoteException;
public void ejbActivae()throws EJBException,RemoteException;
public void ejbPassivate()throws EJBException,RemoteException;
}

import javax.ejb.*;

public class StatefulAccountEJB implements SessionBean{
 public void ejbCreate(double fund)throws CreateException{
    if (fund<0)
       throw new CreateException("Invalid fund");
    this.fundBalance=fund;
 }
 
 public void ejbRemove(){}
 public void ejbActivate(){}
 public void ejbPassivate(){}
 public void setSessionContext(SessionContext ctx){} 
 
 //实例变量，有状态的会话bean将在组件池中维护这个实例的值
 private double fundBalance;
 
 //向基金帐户增加基金
 public void addFunds(double fund)throws InsufficientFundException{
    if (fund<0)
       throw new InsufficientFundException("Invalid fund");
    this.fundBalance+=fund;  
 }
 
 //从基金帐户撤除部分基金
 public void removeFunds(double fund)throws InsufficientFundException{
   if(fund<0)
      throw new InsufficientFundException("Invalid fund");
   if(this.fundBalance<fund)
      throw new InsufficientFundException("the balance less than fund");
   this.fundBalance-=fund;
 }

 //得到基金帐户的余额
 public double getBalance(){
   return this.fundBalance;
 } 
}

cd beanStatefulAccount
mkdir classes
cd src
javac -classpath %CLASSPATH%;../classes -d ../classes  InsufficientFundException.java 
StatefulAccount.java StatefulAccountHome.java StatefulAccountEJB.java

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
    <description>    
        This is StatefulAccount EJB example
    </description>
    <display-name>StatefulAccountBean</display-name>
    <enterprise-beans>
        <session>
            <display-name>StatefulAccount</display-name>
            <ejb-name>StatefulAccount</ejb-name>
            <home>StatefulAccountHome</home>
            <remote>StatefulAccount</remote>
            <ejb-class>StatefulAccountEJB</ejb-class>
            <session-type>Stateful</session-type>
            <transaction-type>Container</transaction-type>
        </session>
    </enterprise-beans>
</ejb-jar>

StatefulAccount <文件夹 designtimesp=22185>
   classes<文件夹 designtimesp=22187>
     META-INF<文件夹 designtimesp=22189>  
         ejb-jar.xml
     InsufficienFundException.class
     StatefulAccount .class
     StatefulAccount EJB.class
     StatefulAccount Home.class
   src<文件夹 designtimesp=22197>
     InsufficientFundException.java
     StatefulAccount.java
     StatefulAccountEJB.java
     StatefulAccountHome.java

cd d:ejbStatefulAccountclasses    (要保证类文件在这个目录下，且有一个META-INF子目录存放ejb-jar.xml文件)
jar -cvf  StatefulAccount.jar *.*

META-INF<文件夹 designtimesp=22233>
   ejb-jar.xml
InsufficientFundException.class
StatefulAccount.class
StatefulAccountEJB.class
StatefulAccountHome.class

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import javax.ejb.*;
import javax.naming.InitialContext;

public class StatefulAccountServlet extends HttpServlet{
 public void service(HttpServletRequest req,HttpServletResponse res) throws IOException {
   res.setContentType("text/html");        
   PrintWriter out =res.getWriter();
   out.println("<html><head><title>StatefulAccountServlet</title></head>");
   out.println("<body><h2>Test Result:<hr>");                
     try{
        InitialContext ctx =new InitialContext();
        Object objRef =ctx.lookup("java:comp/env/ejb/StatefulAccount");
        StatefulAccountHome home=(StatefulAccountHome)
          javax.rmi.PortableRemoteObject.narrow(
          objRef,StatefulAccountHome.class);
        
        //得到一个基金帐户对象的引用，并初始化帐户金额为100000                    
        StatefulAccount bean=home.create(100000);
        out.println("the account balance:"+bean.getBalance()+"<br>");
        //向基金帐户增加5000.25
        bean.addFunds(5000.25);
        out.println("method of addFunds(5000.25) Result:"+bean.getBalance()+"<br>");
        //从基金帐户调出1000.02
        bean.removeFunds(1000.02);
        out.println("method of removeFunds(1000.02) Result:"+bean.getBalance());
        out.println("<hr>");
        out.println("current account balance:"+bean.getBalance());
        
        bean=null;
        
     }catch(javax.naming.NamingException ne){
        out.println("Naming Exception caught:"+ne);
        ne.printStackTrace(out);
     }catch(javax.ejb.CreateException ce){
        out.println("Create Exception caught:"+ce);
        ce.printStackTrace(out);
     }catch(java.rmi.RemoteException re){
        out.println("Remote Exception caught:"+re);
        re.printStackTrace(out);
     }catch(InsufficientFundException ie){
        out.println("InsufficientFund Exception caught:"+ie);
        ie.printStackTrace(out);
     }
     out.println("</body></html>");       
 }               
}

cd D:ejbStatefulAccount
mkdir test
cd test
mkdir WEB-INF
cd WEB-INF
mkdir classes
cd D:ejbStatefulAccountsrc
javac -classpath %CLASSPATH%;../classes/ -d ../test/WEB-INF/classes StatefulAccountServlet.java

  <ejb-ref>
    <description></description>
    <ejb-ref-name>ejb/StatefulAccount</ejb-ref-name>
    <ejb-ref-type>Session</ejb-ref-type>
    <home>StatefulAccountHome</home>
    <remote>StatefulAccount</remote>
    <ejb-link>StatefulAccount</ejb-link>
  </ejb-ref>

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN' 'http://java.sun.com/dtd/web-app_2_3.dtd'>

<web-app>
  <icon>
    <small-icon></small-icon>
    <large-icon></large-icon>
  </icon>
  <display-name>StatefulAccount</display-name>
  <description></description>
  <context-param>
    <param-name>jsp.nocompile</param-name>
    <param-value>false</param-value>
  </context-param>
  <context-param>
    <param-name>jsp.usePackages</param-name>
    <param-value>true</param-value>
    <description></description>
  </context-param>
  <ejb-ref>
    <description></description>
    <ejb-ref-name>ejb/StatefulAccount</ejb-ref-name>
    <ejb-ref-type>Session</ejb-ref-type>
    <home>StatefulAccountHome</home>
    <remote>StatefulAccount</remote>
    <ejb-link>StatefulAccount</ejb-link>
  </ejb-ref>
</web-app>

cd D:ejbStatefulAccount	est
jar -cvf statefulAccount.war *.*

WEB-INF<文件夹 designtimesp=22451>
  classes<文件夹 designtimesp=22453>
    StatefulAccountServlet.class
  web.xml

http://localhost:6888/statefulAccount/servlet/StatefulAccountServlet
localhost-Web Server的主机地址
:6888-应用服务器端口，根据不同的应用服务器，端口号可能不同
/statelessfulAccount-部署servlet时指定的WWW根路径值
/servlet-ejb容器执行servlet的路径
/StatefulAccountServlet-测试程序