开发sessionbean EJB最少也需要三个class,remote interface,home interface,and bean implementation(bean行为).
1. remote interface 用来揭示EJB对外的一些方法.
package helloWorld; import javax.ejb.EJBObject;
import java.rmi.RemoteException;
public interface RemoteHello extends EJBObject
{ public String HelloEcho(String inputString) throws RemoteException; }
2.home interface 是用来规定怎样创建一个实现remote interface的bean.
package helloWorld;
import java.io.Serializable;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBHome;
public interface HomeHello extends EJBHome
{ RemoteHello create() throws RemoteException, CreateException; }
3.bean implementation 是提供方法的实现,这些方法在上述两种interface中都有规定了.
package helloWorld;
import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
public class HelloBean implements SessionBean{
public String HelloEcho(String inputString) {
System.out.println("Someone called 'Hello Echo Successed!'");
return "*********" + inputString + "*********"; }
/** Empty method body */
public void ejbCreate() {
System.out.println("Ejb 4 is creating!...");}
/** Every ejbCreate() method ALWAYS needs a corresponding ejbPostCreate () method with exactly the same parameter types. */
public void ejbPostCreate() {}
/** Empty method body */
public void ejbRemove() {
System.out.println("Ejb 4 is removing!...");}
/** Empty method body */
public void ejbActivate() {
System.out.println("Ejb 4 is activating!...");}
/** Empty method body */
public void ejbPassivate()
{}
/** Empty method body */
public void setSessionContext(SessionContext sc)
{}
}
部署jar
这些classes必须打包进一个JAR文件中,JAR文件中包含了目录结构和包的层次.在本例中, 这些classes是在包helloworld,这样他们需要在目录helloWorld/ 下.
部署发布描述器ejb-jar.XML和jboss.xml
在JAR文档创建之前,还需要一个叫META-INF的目录,这是存放部署发布描述器的(一般叫ejb-jar.xml).
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD EntERPrise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<description>Neosue Helloworld Sample Application</description>
<display-name>Helloworld EJB</display-name>
<enterprise-beans>
<session>
<ejb-name>Helloworld</ejb-name>
<!-- home interface -->
<home>helloWorld.HomeHello</home>
<!-- remote interface -->
<remote>helloWorld.RemoteHello</remote>
<!-- bean implementation -->
<ejb-class>helloWorld.HelloBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Bean</transaction-type>
</session>
</enterprise-beans>
</ejb-jar>
jboss.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss PUBLIC "-//JBoss//DTD JBOSS 4.0//EN" "http://www.jboss.org/j2ee/dtd/jboss_4_0.dtd">
<jboss>
<enterprise-beans>
<session>
<ejb-name>Helloworld</ejb-name>
<jndi-name>Helloworld/Hello</jndi-name>
</session>
</enterprise-beans>
</jboss>
虽然有了上面你的应用程序
和JNDI name的梆定,但是一旦部署发布到JBoss服务器上,你还需要一个jndi.properties文件,以告诉调用你程序的客户端请求到哪里去初始化JNDI naming service.
测试程序:
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
import helloWorld.*;
public class MyTest {
public static void main(String[] args) {
try{ Context ctx=new InitialContext();
Object ref=ctx.lookup("Helloworld/Hello");
HomeHello home=(HomeHello)PortableRemoteObject.narrow(ref,HomeHello.class);
RemoteHello user=home.create(); System.out.println(user.HelloEcho("So easy!"));
}catch(Exception e) {
e.printStackTrace();
}
}
}
Jboss EJB 部署步骤 建立 remote interface-->home interface-->and bean implementation--> ejb-jar.xml-->jboss.xml--打包(package[jar cvf packageName.jar .])-->复制到jboss deploy目录.
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原文 URL http://blog.blogchina.com/refer.159508.html
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补充说明如下:
OS: windows 2000;
JDK: 1.5.0rc;
JBoss: 4.0
HelloWorld.jar
|--META-INF
| |--jboss.xml
| |--ejb-jar.xml
| |--MANIFEST.MF (自动生成)
|--helloWorld
|--RemoteHello.class
|--jndi.properties
|--HomeHello.class
|--HelloBean.class
其中 测试文件 MyTest.class 同目录拷贝一份 jndi.properties 文件过来.
jndi.properties 的内容如下:
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.provider.url=localhost:1099
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces