#大標=Java EE5的關鍵技術
EJB 3.0 Simplified API概觀
#眉標=Java
#副標= Java EE 5伺服器端開發技術大躍進(4)
#作者=文／廖峻鋒



===========box程式1==========
public interface CalculatorRemote
　　　 extends javax.ejb.EJBObject
{
　　public int add(int i,int j) 
　　　　throws java.rmi.RemoteException;
}
===============end=============

============box程式2==========
public interface CalculatorHome 
       extends javax.ejb.EJBHome
{
　CalculatorRemote create() 
　　　throws java.rmi.RemoteException, 
　　　　　　javax.ejb.CreateException;
}
===============end===============

=============程式3=============
public class CalculatorBean
      implements javax.ejb.SessionBean 
{
　private javax.ejb.SessionContext ctx;

　public void ejbCreate() {}
　public void ejbRemove() {}
　public void ejbActivate() {}
　public void ejbPassivate() {}
　public void setSessionContext(javax.ejb.SessionContext ctx) {
　　this.ctx = ctx;
　}
　
　public int add(int i,int j){
   return i+j;
　}
　
}
=============end===========


============box程式5=========
@Remote
public interface Calculator{
    public int add(int i, int j);
}
===============end=============

==============box程式6===========
@Stateless
public class CalculatorBean
    implements CalculatorRemote
{
    public int add(int i, int j){
        return i+j;
    }
}
===============end==============



==========box程式7===========
@Stateless
public class CalculatorBean implements CalculatorRemote{

　　@PostConstruct
    public void myPostConstruct (){
      … (相關處理)… 
　　}

    @PreDestroy
    public void myPreDestroy(){
      … (相關處理)… 
　　}

    @Resource
    private SessionContext ctx;

    public int add(int i, int j){
        return i+j;
    }
}
===============end==============

=============box程式8=========
<ejb-jar>
  <enterprise-beans>
    <session>
      <ejb-name>CalculatorBean</ejb-name>
      <pre-destroy> 
        <lifecycle-callback-method>
          myPreDestroy
        </lifecycle-callback-method>
　　　</pre-destroy>
　　　<post-construct> 
        <lifecycle-callback-method>
          myPostConstruct
        </lifecycle-callback-method>
　　　</ post-construct >
　　</session>
  </enterprise-beans>
</ejb-jar>
=============end===============



=========box程式9============
public class MyLogInterceptor {
　@AroundInvoke
　Object log(javax.interceptor.InvocationContext invocation) 
     throws Exception{
       System.out.println(“呼叫EJB服務名稱: “+
                       inv.getMethod().getName());
       return inv.proceed();
　}
}
=============end===============

=========box程式10==========
public interface InvocationContext{
　public Object getTarget();
　public Method getMethod();
　public Object[] getParameters();
　public void setParameters(Object[] newArgs);
　public void Map<String,Object> getContextData();
　public Object proceed() throws Exception;
}
=============end============



=========box程式11==========
@Interceptor(MyLogInterceptor.class)
@Stateless
public class CalculatorBean implements CalculatorRemote{
　…(略)
}
===========end===========