J2EE????

1
J2EE????

• ???(????)

http//www.jdon.com
2
????????????

• J2EE?????????????????????????
• ????????????,?OOP???????
• ??????????????????????????

3
GoF????

• GoF????????????23???
• Java?GoF??????????????????
• ???????????????

4
??????

• ????Class???AClass,????????,????Class????????,??AC
  lass????AInterface,????AClass???????
• AInterface a new AClass()

5
??????(?)

• ???????
• AInterface a Afactory.create() //??2
• ????2??????Afactory?create?????AInterface??

6
??????(?)

• Afactory?create????????????
• ????????????,????????,??????
• Afactory?create????
• public static AInterface create()
• return new AClass()

7
EJB??????????

• ??EJB ??EJBHome em JNDIServer.getRemoteHome(EJ
  B-JNDI-NAME) EJBObject myEJB em.create()
• em.create()??Afactory.create()
• EJBObject ???

8
Façade??
9
?? Bean???Bean

• ????Bean???????Bean
• ???Bean???Façade?/Manager?
• ??Façade ??Bean??1. ????,???????????Bean?????2.
  ????,???????

10
DTO??

• DTO????VO??,???????????JavaBeans,?J2EE?????????
• DTO????,???????Message
• ?JavaBeans?????????Model

11
????

• Model ? Domain Object??DTO??1.
  ????Model????????2. ??????,??????3.
  ??????,DTO?????Model????

12
Model?MDA
13
MVC??

• MVC???J2EE Web??????

14
Struts??(Framework)

• Struts???MVC?????(???)
• ??(Framework)???(Pattern)???1. ??????????2.
  ???????????????3. ????????????

15
????

• ?????????????????
• ???????????????????????????????
• ???????????????(Access Proxy)????????????

16
????

• ??
• public interface BaseIF
• public Object myMethod()
• ???
• public class OriginClass implements BaseIF
• public Object myMethod ()
• return " hello , It is me! "

17
????(?)

• ???
• public class ProxyClass implements BaseIF
• public Object myMethod ()
• //???????????OriginClass
• BaseIF instance getRemoteOrigin ()
• Return instance.myMethod ()
• ..
• ?????
• BaseIF instance new Proxy Class()
• String (String)instance.myMethod ()
• System.out.println(result) //????
  hello , It is me!

18
??????

• ??????Java???(Reflect)??,?????????????????????????
  ?????????
• ???????????????????????????????,??????????????????
  ??AOP??????
• ????????,??????????,??JBoss 3.XX?????

19
JdonSD??

• JdonSD???????????
• JdonSD?????AOP?MDA??????
• ????RBAC????