jbuilder2005+jboss-4.0.2rc1+j2sdk1.5+log4j Development Session Bean Ii. (3)

Session
Author: Junsan Jin

Date: 2005-3-30

Version: 1.0

Mailbox: junsan21@126.com; Junnef21@sohu.com

Disclaimer: I reserve all the rights of this article.










Part III: Developing session Beans


New EJB module:











Select menu: NEW〉ENTERPRISE〉EJB〉EJB Designer, Pop-up dialog box, select New, select Create Empty EJB Module, click Next, fill in the name trader, all the way OK.



Designing EJBS:











1. New Session Bean: Right-click menu 〉create ejb〉session Bean in the Open EJB Designer window (now JBuilder right window).











2, modify the basic nature of the Bean: name modified to Userinfo,interface for local,session type is stateful, other default.











3, add attributes: Right-click the bean design 〉add〉field, adding username type String,userage type String,logintime type sting.











4, Add methods: Right click on the bean design diagram 〉add〉methed, adding method Showuserinfo, return type is hashmap,interface for local.











5, add Ejbcreate method: Right click on the bean Design 〉add〉ejbcreate, input parameters are: string userName, String userage, string Logintime,home interfaces to Local home.











6. View the bean's code: Right-click the bean design 〉view bean Source to view the code.



The final code is:











-----------------------------------------------











Userinfobean.java Implementation class:











----------------------------------------------











Package trader;



Import Javax.ejb.SessionBean;











Import Javax.ejb.SessionContext;











Import javax.ejb.CreateException;











Import Java.util.HashMap;











Import Org.apache.log4j.Logger;



public class Userinfobean implements Sessionbean {











Private final static Logger _logger = Logger.getlogger (Userinfobean.class);











Public Userinfobean () {











try {











Jbinit ();











catch (Exception ex) {











Ex.printstacktrace ();











}











}



Sessioncontext Sessioncontext;











String UserName;











String Userage;











String Logintime;



public void Ejbcreate (string userName, String userage,











String logintime) throws CreateException {











_logger.debug ("Session Bean is Created.");











This.username = UserName;











This.userage = Userage;











This.logintime = Logintime;











}



public void Ejbcreate () throws CreateException {











}



public void Ejbremove () {











}



public void Ejbactivate () {











}



public void Ejbpassivate () {











}



public void Setsessioncontext (Sessioncontext sessioncontext) {











This.sessioncontext = Sessioncontext;











}



Public HashMap Showuserinfo () {











HashMap userInfo = new HashMap ();











Userinfo.put ("UserName", this.username);











Userinfo.put ("Userage", this.userage);











Userinfo.put ("Logintime", this.logintime);











return userInfo;











}



private void Jbinit () throws Exception {











}











}











----------------------------------------------------











Userinfolocal.java local Remote interface classes:











---------------------------------------------------











Package trader;



Import Javax.ejb.EJBLocalObject;











Import Java.util.HashMap;



Public interface Userinfolocal extends Ejblocalobject {











Public HashMap showuserinfo ();











}











-----------------------------------------------------











Userinfolocalhome.java Local local interface class











-----------------------------------------------------











Package trader;



Import Javax.ejb.EJBLocalHome;











Import javax.ejb.CreateException;



Public interface Userinfolocalhome extends Ejblocalhome {











Public userinfolocal Create () throws createexception;



Public userinfolocal Create (string userName, String userage,











String logintime) throws createexception;











}



OK, now that our EJB is ready to run, we will test this session Bean in the next section. (To be continued)