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下圖是這個(gè)文件的源代碼。MyejbMd
package myejb.maxuan.ejb.model;
import java.io.*;
public class MyejbMd implements Serializable {
public MyejbMd() {
}
public String dlDm;
public String dlMc;
public String action;
public String getDlDm() {
return dlDm;
}
public void setDlDm(String dlDm) {
this.dlDm = dlDm;
}
public String getDlMc() {
return dlMc;
}
public void setDlMc(String dlMc) {
this.dlMc = dlMc;
}
public String getAction() {
return action;
}
public void setAction(String action) {
this.action = action;
}
private void writeObject(ObjectOutputStream oos) throws IOException {
oos.defaultWriteObject();
}
private void readObject(ObjectInputStream ois) throws ClassNotFoundException, IOException {
ois.defaultReadObject();
}
}
然后我們需要編輯實(shí)體BEAN文件來(lái)引入模型和對(duì)數(shù)據(jù)庫(kù)的基本操作。
Myejb.java文件
package myejb.maxuan.ejb;
import javax.ejb.*;
import java.util.*;
import myejb.maxuan.ejb.model.*;
public interface Myejb extends javax.ejb.EJBLocalObject {
public String getDlDm();
public void setDlMc(String dlMc);
public String getDlMc();
public MyejbMd getDlMd();
public void setMyejbMd(MyejbMd dlMd);
}
MyejbBean.java文件
package myejb.maxuan.ejb;
import javax.ejb.*;
import myejb.maxuan.ejb.model.*;
abstract public class MyejbBean implements EntityBean {
EntityContext entityContext;
public java.lang.String ejbCreate(java.lang.String dlDm) throws CreateException {
setDlDm(dlDm);
return null;
}
public void ejbPostCreate(java.lang.String dlDm) throws CreateException {
/**@todo Complete this method*/
}
public java.lang.String ejbCreate(java.lang.String dlDm, java.lang.String dlMc) throws CreateException {
setDlDm(dlDm);
setDlMc(dlMc);
return null;
}
public void ejbPostCreate(java.lang.String dlDm, java.lang.String dlMc) throws CreateException {
/**@todo Complete this method*/
}
public void ejbRemove() throws RemoveException {
/**@todo Complete this method*/
}
public abstract void setDlDm(java.lang.String dlDm);
public abstract void setDlMc(java.lang.String dlMc);
public abstract java.lang.String getDlDm();
public abstract java.lang.String getDlMc();
public void ejbLoad() {
/**@todo Complete this method*/
}
public void ejbStore() {
/**@todo Complete this method*/
}
public void ejbActivate() {
/**@todo Complete this method*/
}
public void ejbPassivate() {
/**@todo Complete this method*/
}
public void unsetEntityContext() {
this.entityContext = null;
}
public void setEntityContext(EntityContext entityContext) {
this.entityContext = entityContext;
}
public myejb.maxuan.ejb.model.MyejbMd getDlMd() {
MyejbMd dlMd = new MyejbMd();
dlMd.setDlDm(getDlDm());
dlMd.setDlMc(getDlMc());
return dlMd;
}
public void setMyejbMd(MyejbMd dlMd){
setDlMc(dlMd.getDlMc());
}
}
接著我們要編輯最后的MyejbHome.java，雙擊左邊樹(shù)的EJB，在右邊的面板中選中Myejb后點(diǎn)右鍵，在出現(xiàn)的菜單中選ADD，選取下面的Findel方法，如下圖所示：
在接著出現(xiàn)的對(duì)話(huà)框中選擇填寫(xiě)如下：
我們繼續(xù)編輯MyejbHome.java文件
package myejb.maxuan.ejb;
import javax.ejb.*;
import java.util.*;
public interface MyejbHome extends javax.ejb.EJBLocalHome {
public Myejb create(String dlDm) throws CreateException;
public Myejb create(String dlDm, String dlMc) throws CreateException;
public Collection findAll() throws FinderException;
public Myejb findByPrimaryKey(String dlDm) throws FinderException;
}
好了，實(shí)體BEAN文件我們已經(jīng)寫(xiě)完了，現(xiàn)在我們編譯一下，看有沒(méi)有什么錯(cuò)誤。
新手提示：在引入模型之前，我們需要先編譯一下模型文件。
在接下來(lái)我們將寫(xiě)一個(gè)SessionBean。
我們繼續(xù)來(lái)完成這個(gè)EJB，我們需要來(lái)寫(xiě)一個(gè)SessionBean，創(chuàng)建方法與創(chuàng)建實(shí)體BEAN一樣，這里不在多說(shuō)，只把它們的源碼貼出，請(qǐng)大家仔細(xì)看，理解其中的意義！
這里我將SessionBean命名為MyejbWeb
MyejbWeb.java
package myejb.maxuan.ejb;
import javax.ejb.*;
import java.util.*;
import java.rmi.*;
import java.sql.*;
import java.io.*;
import myejb.maxuan.ejb.model.*;
public interface MyejbWeb extends javax.ejb.EJBObject {
public ArrayList getDlList() throws RemoteException;
public MyejbMd getDl(String dlDm) throws RemoteException;
}
MyejbWebBean.java
package myejb.maxuan.ejb;
import javax.ejb.*;
import java.util.*;
import java.sql.*;
import java.sql.Date;
import java.io.InputStream;
import java.io.OutputStream;
import myejb.maxuan.ejb.model.*;
public class MyejbWebBean implements SessionBean {
SessionContext sessionContext;
public void ejbCreate() throws CreateException {
/**@todo Complete this method*/
}
public void ejbRemove() {
/**@todo Complete this method*/
}
public void ejbActivate() {
/**@todo Complete this method*/
}
public void ejbPassivate() {
/**@todo Complete this method*/
}
public void setSessionContext(SessionContext sessionContext) {
this.sessionContext = sessionContext;
}
public ArrayList getDlList(){
ArrayList dlList=new ArrayList();
try {
javax.naming.Context context = new javax.naming.InitialContext();
MyejbHome dlHome= (MyejbHome)context.lookup("Myejb");
Collection dlCntl = dlHome.findAll();
Iterator iterator = dlCntl.iterator();
while(iterator.hasNext()){
Myejb myEjb = (Myejb) iterator.next();
MyejbMd dlMd = myEjb.getDlMd();
dlList.add(dlMd);
}
}catch (Exception ex) {
throw new EJBException(ex);
}
return dlList;
}
public MyejbMd getDl(String dlDm){
MyejbMd dlMd=new MyejbMd();
try {
javax.naming.Context context = new javax.naming.InitialContext();
MyejbHome dlHome= (MyejbHome)context.lookup("Myejb");
try{
Myejb myEjb = dlHome.findByPrimaryKey(dlDm);
dlMd = myEjb.getDlMd();
}catch(FinderException fe){
dlMd=null;
}
}catch (Exception ex) {
throw new EJBException(ex);
}
return dlMd;
}
}
MyejbWebHome.java
package myejb.maxuan.ejb;
import javax.ejb.*;
import java.util.*;
import java.rmi.*;
public interface MyejbWebHome extends javax.ejb.EJBHome {
public MyejbWeb create() throws CreateException, RemoteException;
}
至此，我們的EJB部份已經(jīng)完成，明天我們將繼續(xù)寫(xiě)一個(gè)javabean來(lái)訪問(wèn)這個(gè)EJB！同時(shí)我們也會(huì)引入struts，請(qǐng)大家留意！
PS：雖然這只是一個(gè)簡(jiǎn)單的EJB網(wǎng)絡(luò)應(yīng)用結(jié)構(gòu)，但卻是建立J2EE大型應(yīng)用的基礎(chǔ)，希望大家多多交流��！
本文鏈接：http://www.95time.cn/tech/program/2004/1603.asp 
出處：藍(lán)色理想
責(zé)任編輯：藍(lán)色
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