Hi,
I am trying to learn and create a working DB based application using struts.
I have figured out following steps to follow, may be this is not the best
practice. I would like to get some comments from struts and Java guru.
Please feel free to correct me.
1. Create a EmpForm class which has all the property of a employee and
all the set and get methods. This EmpForm also may has a colloection
of EmpVO ( value object) fiels. This class extend ValidatorForm
class and implement Iterator interface.
Q. I still not sure, where should I store EmpVO, whether as a field
in EmpForm or in Request object? Please advise here
2. Create a BaseAction class. Which extend the Action class and
override the execute method. Based on a hidden field execute method
call different methods (like for save or new or display). All these
methods will be override in proper sub class.
3. Create a EmpAction class which extend BaseAction class. Override the
required methods. Let’s say it override displayEmp method.
DisplayEmp return a Collection of EmpVO.
In DisplayEmp method we do following things
EmpBO empbo = new EmpBO() // EmpBO is business delegates
Collection empVO = empbo.getVO()
4. Create a class EmpDAOFactory to get the actual Implementation of
BaseDAO interface using JNDI. It has a getDAO() function that will
return EmpDAO.
In the contructor of EmpBO
EmpDAO empdao = EmpDAOFactory.getDAO()
In getVO() function of EmpBO
return empdao.DisplayEmp()
5. BaseDAO interface has all the functions related to user actions
(like save,display,new..) and will be implemented by a every DB
access related classes.
6. constructor of EmpDAO uses JNDI to get a instance of datastore using
deployment descriptor.
EmpDAO.DisplayEmp() function do following
Get dbconnection
Build and Execute sql
Build EmpVO
Close the dbconnection
Return EmpVO
7. At this ponit control will go back to EmpAction class, and now
EmpAction has Collection of EmpVO. Now we can either set this EMPVO
to a filed in EmpForm or store it in Request object. ( I am not sure
which one is better)
Your comments would be greatly appreciated. Please help me to build my first
application.
Thanks
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