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**EJB3 实例教程(JBoss+Eclipse+Ant)** Enterprise JavaBeans（EJB）是Java平台上用于构建可扩展、安全且事务处理能力强的企业级应用的技术。EJB3是EJB规范的一个重大改革，它引入了许多简化开发的特性，使得企业级应用的开发变得更加容易。在这个教程中，我们将深入探讨如何在JBoss应用服务器上使用EJB3，并结合Eclipse IDE和Ant构建工具进行实践。 EJB3的核心改进包括了注解驱动的编程模型，这极大地减少了XML配置文件的需求。例如，你可以直接在实体Bean类上使用`@Entity`、`@Table`、`@Id`等注解来定义数据存储的相关信息。同时，EJB3引入了无状态会话Bean（@Stateless）和有状态会话Bean（@Stateful），以及单例Bean（@Singleton），这些都通过注解轻松创建和管理。 EJB3中的实体Bean不再需要实现特定接口，而是基于Java Persistence API (JPA)。JPA允许开发者使用ORM（对象关系映射）技术，将Java对象与数据库表进行映射。这大大简化了数据库操作，如`@NamedQuery`可以用于预定义SQL查询。本教程可能包含以下章节： 1. **EJB3基础**：介绍EJB3的主要概念，包括实体Bean、会话Bean和消息驱动Bean的基本用法。 2. **JBoss应用服务器设置**：讲解如何安装和配置JBoss，以便运行EJB3应用。 3. **Eclipse集成**：说明如何在Eclipse IDE中创建EJB项目，设置服务器运行环境，以及利用Eclipse的EJB插件进行开发。 4. **Ant构建工具**：介绍如何使用Ant编写build.xml文件，实现项目的编译、打包和部署。Ant任务如`ejb-jar`和`ear`可以帮助我们生成EJB JAR和EAR文件。 5. **实战示例**：提供一个简单的EJB3应用程序实例，如用户管理系统，展示如何创建Bean、持久化实体、实现业务逻辑以及调用远程接口等步骤。 6. **测试与调试**：讨论如何使用JUnit测试EJB组件，以及在JBoss环境下进行调试的方法。在学习过程中，提供的`first-ejb3-ant-tutorial-en.pdf`文档将详细解释每个步骤，而`first-ejb3-ant-tutorial.zip`则包含了源代码和相关资源，供读者实际操作练习。这个教程旨在帮助开发者快速理解和掌握EJB3的基本用法，通过结合JBoss、Eclipse和Ant，让开发流程更加顺畅。通过实践，你将能够运用EJB3构建高效、可靠的企业级应用。

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EJB3实例教程.rar （2个子文件）

first-ejb3-ant-tutorial.zip 36KB

first-ejb3-ant-tutorial-en.pdf 236KB

First EJB 3 Ant Tutorial

This tutorial explains basics about EJB3 and shows a simple work through to set up a EJB 3

project, create a entity bean and a session bean façade using Eclipse and Ant.

Ant and creating of build files with Ant is described in detail. This could be your Ant primer as well.

Do you need expert help or consulting? Get it at http://www.laliluna.de

In-depth, detailed and easy-to-follow Tutorials for JSP, JavaServer Faces, Struts, Spring,

Hibernate and EJB

Seminars and Education at reasonable prices on a wide range of Java Technologies, Design

Patterns, and Enterprise Best Practices Improve your development quality

An hour of support can save you a lot of time - Code and Design Reviews to insure that the

best practices are being followed! Reduce solving and testing time

Consulting on Java technologies Get to know best suitable libraries and technologies

General

Author: Sebastian Hennebrueder

Date: March, 15

2006

Used software and frameworks

Eclipse 3.1

Ant as included in Eclipse

Source code: http://www.laliluna.de/download/first-ejb3-tutorial.zip

PDF version of the tutorial:

http://www.laliluna.de/download/first-ejb3-tutorial-en.pdf

Table of Content

First EJB 3 Ant Tutorial...................................................................................................................... 1

General...............................................................................................................................................1

EJB 3 Basics...................................................................................................................................... 2

Entity Beans...................................................................................................................................2

Session Beans...............................................................................................................................2

Message Driven Beans..................................................................................................................2

Set up a Java project......................................................................................................................... 2

Add needed libraries to the project.................................................................................................... 3

Create an Entity Bean........................................................................................................................ 4

Adding the Annotations................................................................................................................. 6

Sequence primary key.............................................................................................................. 7

Identity primary key................................................................................................................... 7

Table based primary key...........................................................................................................7

JNDI data source........................................................................................................................... 7

Stateless Session Bean..................................................................................................................... 8

Create local and remote interfaces .............................................................................................. 8

Page 1 of 18

Building your application with Ant.....................................................................................................10

Ant build files............................................................................................................................... 11

Basic configuration...................................................................................................................... 11

Build in properties................................................................................................................... 12

Target explanation.................................................................................................................. 13

Running Ant in Eclipse................................................................................................................ 14

Using a property file (build.properties)........................................................................................ 14

Deploy the application...................................................................................................................... 16

Create a test client........................................................................................................................... 17

Copyright and disclaimer..................................................................................................................18

EJB 3 Basics

J2EE is a technology from Sun to develop multi tier applications. It is a standard which is

implemented by many container providers. The container provides functionality like transaction

management, clustering, caching, messaging between applications or in an application and much

more. EJB 3 is becoming the next version of EJB. In March 2006, there are first demo

implementations by some application server providers. This tutorial uses JBoss as application

server.

An EJB (Enterprise Java Bean) is a special kind of class. There are three major types of EJBs.

Entity Beans

They can be used to map an entry in a database table to a class. (Object Relational Mapping)

Instead of using result Sets from a database query you work with a class. The application server

provides the functionality to load, update or delete the values of a class instance to the database.

Session Beans

Session beans are used to implement the functionality of your application. There are two kind of

session beans: Stateful and Stateless.

A stateful session bean is for example a shopping cart class. The state is the cart holding the

shopping items and the quantity. The cart class is hold in your application session and disposed at

the end when the user checked out.

A stateless bean is a short living class. A typical example is a MailSender class sending a

message. You call a method and dispose it. With a application server you do not instantiate the

class each time you need it. The application server passes an instance from a pool. This is more

efficient.

Message Driven Beans

Message beans provide functionality to implement messaging in your business logic. When you

want to send a message to one or more recipients to start another business logic, you can use

message beans. A Shop application could send a order message to the Warehouse management.

Once the warehouse management software is started, it receives the orders from the shop

application.

Set up a Java project

Create a new Java project.

Page 2 of 18

I used FirstEjb3Tutorial as name.

As we are going to use Entity beans, we need some kind of datasource. This can be configured in

a file named persistence.xml.

Create a folder META-INF and a file named persistence.xml in this folder.

JBoss supports the tag hibernate.hbm2ddl.auto to define if your tables are created or udpated

during redeployment. I chose create-drop to have them dropped after each undeployment, so that

they can be nicely recreated. The option update does not work sometimes.

<persistence-unit name="FirstEjb3Tutorial">

<jta-data-source>java:/ejb3ProjectDS</jta-data-source>

<property name="hibernate.hbm2ddl.auto"

value="create-drop"/>

</properties>

</persistence-unit>

</persistence>

Add needed libraries to the project.

We will need some libraries during development of ejb3 and some for using a remote client to test

our application later on.

You need to collect the libraries together. I recommend to pack them into a user library. Than you

will have this work only once.

Download JBoss EJB3 at http://www.jboss.org/products/list/downloads

Get all the libraries we need from this package.

Page 3 of 18

Than have a look into your JBoss directory. We will need the jbossallclient.jar and the jboss.jar.

My directory when I am working under Windows:

E:\jboss-4.0.4RC1\client

There is a fair chance that I selected to many libraries. Try if you like which one you can delete.

Create an Entity Bean

Create a new class Book in the package de.laliluna.library

Add the attributes

private Integer id;

private String title;

private String author;

Page 4 of 18

Select Generate Getter/Setter from the Source Menu.

In Eclipse you can reach the function with Alt+Shift + S or with the context menu (right mouse

click) of the source code.

Add the following constructors and implement the toString method. (Alt+Shift+S +

Override/Implement methods). This is useful for debugging.

public Book() {

super();

}

public Book(Integer id, String title, String author) {

super();

this.id = id;

this.title = title;

this.author = author;

}

@Override

public String toString() {

return "Book: " + getId() + " Title " + getTitle() + " Author "

+ getAuthor();

}

Implement the interface java.io.Serializable. It is a marker interface. This means you do not have

to implement any methods (normally).

Finally, this is our full source code now:

package de.laliluna.library;

import java.io.Serializable;

/**

* @author hennebrueder

public class Book implements Serializable {

/**

private static final long serialVersionUID = 7422574264557894633L;

private Integer id;

private String title;

private String author;

public Book() {

super();

}

public Book(Integer id, String title, String author) {

super();

this.id = id;

Page 5 of 18

评论收藏

内容反馈

Ploware

2012-09-15

讲得还可以，不过最近看了spring的资料，并且参加过一些论坛，大家似乎觉得ejb并不好，不要太热衷于ejb，就用spring的事务管理也挺好。
lottelotte

2014-06-30

不错，谢谢

张建飞（Frank）

粉丝: 6670

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