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EJB3 學(xué)習(xí)Notes 1。

Notes 1]   Get Started --- setup environment and Helloworld Example

       1. 建立開發(fā)環(huán)境，安裝JDK5.0 Up，設(shè)置JAVA_HOME
              下載EJB3 Container，本文采用Sun的GlassFish V2，glassfish-installer-v2ur1-b09d-windows.jar，
              java -Xmx256m -jar glassfish-installer-v2ur1-b09d-windows.jar
              cd glassfish
              lib\ant\bin\ant -f setup.xml

       2. 啟動(dòng)GlassFish，把glassfish_home\bin 加到Path, 執(zhí)行Command，asadmin start-domain domain1 或者asadmin start-domain 將會(huì)啟動(dòng)默認(rèn)
            的domain. 用asadmin stop-domain domain1來shutdown GlassFish.
           關(guān)于admin command 可以參考http://docs.sun.com/app/docs/doc/819-3675/6n5slue6r?a=expand
       3. 建立測(cè)試環(huán)境，添加以下的Jars到ClassPath，
            GlassFish\lib\admin-cli.jar
            GlassFish\lib\appserv-rt.jar
            GlassFish\lib\appserv-ext.jar
            GlassFish\lib\javaee.jar

            創(chuàng)建jndi.properties,放在src目錄下，

                     java.naming.factory.initial=com.sun.enterprise.naming.SerialInitContextFactory
          java.naming.factory.url.pkgs=com.sun.enterprise.naming
          java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl
          org.omg.CORBA.ORBInitialHost=localhost
          org.omg.CORBA.ORBInitialPort=3700

創(chuàng)建sun-ejb-jar.xml,放在META-INF目錄下，

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE sun-ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 9.0 EJB 3.0//EN" "http://www.sun.com

/software/appserver/dtds/sun-ejb-jar_3_0-0.dtd">

<sun-ejb-jar>

<enterprise-beans>

</enterprise-beans>

</sun-ejb-jar>

創(chuàng)建數(shù)據(jù)庫(kù)表：

CREATE TABLE "PEOPLE"

( "ID" NUMBER(9,0) NOT NULL ENABLE,

"NATION" VARCHAR2(20 BYTE) NOT NULL ENABLE,

"CITY" VARCHAR2(50 BYTE),

"PHONE_NUMBER" VARCHAR2(50 BYTE),

"ZIP_CODE" VARCHAR2(20 BYTE),

"NAME" VARCHAR2(200 BYTE) NOT NULL ENABLE,

CONSTRAINT "PEOPLE_PK" PRIMARY KEY ("ID")

USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255

STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645

PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)

TABLESPACE "DEMO" ENABLE

) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING

STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645

PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)

TABLESPACE "DEMO" ;

       配置數(shù)據(jù)庫(kù)DataSource 以及JNDI
    4. 開始EJB3的第1個(gè)helloworld，
           (1).創(chuàng)建1個(gè)Entity

package ejb3.example.entity;

import java.io.Serializable;

import javax.persistence.Basic;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.NamedQuery;

import javax.persistence.SequenceGenerator;

import javax.persistence.Table;

@Entity

@Table(name="PEOPLE")

@NamedQuery(name = "People.findAll", query = "SELECT p FROM People p")

@SequenceGenerator(name = "PeopleSequence",sequenceName="SEQ_PEOPLE",initialValue=1,allocationSize=1)

public class People implements Serializable{

@Id

@Column(name="ID",nullable=false)

@GeneratedValue(strategy = GenerationType.SEQUENCE,generator="PeopleSequence")

private int id;

@Column(name="NATION",nullable=false)

private String nation;

@Basic

private String city;

@Column(name="PHONE_NUMBER")

private String phoneNumber;

@Column(name="ZIP_CODE")

private String zipCode;

@Column(name="NAME",nullable=false)

private String name;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getNation() {

return nation;

}

public void setNation(String nation) {

this.nation = nation;

}

public String getCity() {

return city;

}

public void setCity(String city) {

this.city = city;

}

public String getPhoneNumber() {

return phoneNumber;

}

public void setPhoneNumber(String phoneNumber) {

this.phoneNumber = phoneNumber;

}

public String getZipCode() {

return zipCode;

}

public void setZipCode(String zipCode) {

this.zipCode = zipCode;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String toString(){

return new StringBuilder()

.append("id="+id+"\n")

.append("name="+name+"\n")

.append("nation="+nation+"\n")

.append("city="+city+"\n")

.append("zipCode="+zipCode+"\n")

.append("phoneNumber="+phoneNumber).toString();

}

創(chuàng)建persistence.xml放在META-INF目錄下，定義Persistence Unit提供給EntityManager使用

<?xml version="1.0" encoding="UTF-8" ?>

<persistence xmlns="http://java.sun.com/xml/ns/persistence"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"

version="1.0">

<persistence-unit name="PeoplePersistenceUnit" transaction-type="JTA">

oracle.toplink.essentials.PersistenceProvider

</provider>

<jta-data-source>oracleDataSourceJNDI</jta-data-source>

<class>ejb3.example.entity.People</class>

<!--<property name="toplink.ddl-generation" value="drop-and-create-tables"/>

-->

</properties>

</persistence-unit>

</persistence>

(2) 創(chuàng)建IPeoplePersistenceService來做Persistence Facade，使用EntityManager的API

package ejb3.example.service.api;

import java.util.List;

import javax.ejb.Local;

import ejb3.example.entity.People;

public interface IPeoplePersistenceService {

public void save(People p);

public People find(int id);

public List<People>findAll();

public void update(People p);

public void delete(int id);

public List<People>query(String query);

public List<People> queryByPagination(String query,int startPage,int pageSize);

}

(3). 實(shí)現(xiàn)Persistent Service

package ejb3.example.service.impl;

import java.util.List;

import javax.ejb.Stateless;

import javax.persistence.EntityManager;

import javax.persistence.PersistenceContext;

import javax.persistence.Query;

import ejb3.example.entity.People;

@Stateless

public class PeoplePersistenceServiceBean implements IPeoplePersistenceService {

@PersistenceContext(unitName="PeoplePersistenceUnit")

private EntityManager entityManager;

private static final int DEFAULT_PAGE_SIZE=20;

public List<People>query(String query){

return entityManager.createQuery(query).getResultList();

}

public List<People>findAll(){

return entityManager.createNamedQuery("People.findAll").getResultList();

}

public void save(People p) {

assertNotNull(p);

entityManager.persist(p);

}

public People find(int id){

return entityManager.find(People.class, id);

}

public void delete(int id) {

People p=entityManager.find(People.class, id);

if(p!=null)

entityManager.remove(p);

}

public void update(People p) {

assertNotNull(p);

entityManager.merge(p);

}

public List<People> queryByPagination(String query,int startPage,int pageSize){

Query q=entityManager.createQuery(query);

q.setMaxResults(pageSize<1?DEFAULT_PAGE_SIZE:pageSize);

if(startPage<1)startPage=1;

q.setFirstResult(startPage*pageSize);

return q.getResultList();

}

private void assertNotNull(Object o){

if(null==o)

throw new RuntimeException("Object cannot be null");

}

(4). 創(chuàng)建Business Logic的Service Interface

package ejb3.example.service.api;

import java.util.List;

import javax.ejb.Local;

import javax.ejb.Remote;

import ejb3.example.entity.People;

public interface IPeopleManager {

public People findById(int id);

public List<People> findByName(String name);

public List<People> findByNation(String nation);

public List<People> findAll();

public void update(People p);

public void deleteById(int id);

public void save(People p);

public List<People> queryByPagination(String query,int startPage,int pageSize);

}

(5).創(chuàng)建Stateless Bean來處理Busniess Logic ，它實(shí)現(xiàn)IPeopleManager

package ejb3.example.service.impl;

import java.util.List;

import javax.annotation.Resource;

import javax.ejb.EJB;

import javax.ejb.Remote;

import javax.ejb.Stateless;

import javax.jms.Connection;

import javax.jms.ConnectionFactory;

import javax.jms.Destination;

import javax.jms.JMSException;

import javax.jms.MessageProducer;

import javax.jms.ObjectMessage;

import javax.jms.Session;

import ejb3.example.entity.People;

@Local(IPeopleManager.class)

@Stateless(name="peopleManagerBean", mappedName="peopleManagerBeanJNDI")

public class PeopleManagerBean implements IPeopleManager {

private static final String PEOPLE_ENTITY=People.class.getSimpleName();

@EJB IPeoplePersistenceService persister;

public void deleteById(int id) {

persister.delete(id);

}

public List<People> findAll() {

return persister.findAll();

}

public People findById(int id) {

return persister.find(id);

}

public List<People> findByName(String name) {

return persister.query("select p from "+PEOPLE_ENTITY+" p where p.name=:"+name);

}

public List<People> findByNation(String nation) {

return persister.query("select p from "+PEOPLE_ENTITY+" p where p.nation=:"+nation);

}

public List<People> queryByPagination(String query,int startPage, int pageSize) {

return persister.queryByPagination(query, startPage, pageSize);

}

public void save(People p) {

persister.save(p);

}

public void update(People p) {

persister.update(p);

}

(6). Export Jar，把它放在glassfish\domains\domain1\autodeploy,這個(gè)會(huì)再GlassFish啟動(dòng)的時(shí)候自動(dòng)部署或者打開http://localhost:4848,用默認(rèn)的帳號(hào)登陸來Deploy
             (user: admin   password: adminadmin)


        (7). 創(chuàng)建測(cè)試客戶端

package ejb3.example.client;

import java.sql.SQLException;

import java.util.Iterator;

import javax.naming.Context;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import ejb3.example.service.api.IPeopleManager;

import ejb3.example.entity.People;

public class TestClient {

/**

* Method documentation to be filled

* TODO

* @param args

* @throws NamingException

* @throws SQLException

* @throws ClassNotFoundException

* @throws IllegalAccessException

* @throws InstantiationException

public static void main(String[] args) throws NamingException, SQLException, InstantiationException, IllegalAccessException, ClassNotFoundException {

Context context = new InitialContext ();

IPeopleManager mgr = (IPeopleManager)context.lookup ("peopleManagerBeanJNDI");

People p=mgr.findById(1);

p.setCity("beijing Chaoyang");

p.setName("gembin");

p.setNation("Great China");

p.setPhoneNumber("xxxx");

p.setZipCode("100000");

mgr.update(p);

Iterator<People>ps=mgr.findAll().iterator();

while(ps.hasNext()){

System.out.println("*********************");

System.out.println(ps.next());

System.out.println("*********************");

}

posted on 2009-02-26 09:44 paulwong 閱讀(409) 評(píng)論(0) 編輯收藏所屬分類: J2EE

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EJB3 學(xué)習(xí)Notes 1。