EJB3与Spring的集成

http://www.iteye.com/topic/851288

ejb3集成spring，部署于tomcat(OpenEjb) ,jdk1.6

1 Tomcat本不支持部署EJB，通过向其安装OpenEjb，可使其支持。

   下载http://www.apache.org/dyn/closer.cgi/openejb/3.1.3/openejb.war

   将下载的openejb.war 放在Tomcat的安装目录 webapps下。

   启动Tomcat。

   在IE中输入：http://localhost:8080/openejb 即可看到openejb信息

  2  ejb3与spring的集成

  EJB bean Hello 定义：

@Local

public interface HelloLocal

{

    public void hello();

}

@Stateless

public class HelloBean implements Hello,HelloLocal

{

    public void hello()

    {

        System.out.println("Hello,world!");

    }  

}

EJB bean Calculator 定义

(在CalculatorImpl中调用调用EJB bean Hello、Spring bean Chat)

  @Remote

public interface CalculatorRemote {

    public int sum(int add1, int add2);

    public int multiply(int mul1, int mul2);

}

@Stateless

@Interceptors(SpringBeanAutowiringInterceptor.class)

public class CalculatorImpl implements CalculatorRemote, CalculatorLocal {

    @EJB private HelloLocal helloBean;

    @Autowired private Chat chat;

    public void setChat(@Qualifier("chat") Chat chat){

        this.chat=chat;

    }

    public int sum(int add1, int add2) {

        helloBean.hello();

        chat.chat();

        return add1+add2;

    }

    public int multiply(int mul1, int mul2) {

        return mul1*mul2;

    }

}

  Chat bean定义----spring：

public interface Chat

{

    public void chat();

}

@Service

public class ChatImpl implements Chat

{

    public ChatImpl(){

        System.out.println("==================initial =====ChatImpl=========");

    }

    @Override

    public void chat()

    {

        // TODO Auto-generated method stub

        System.out.println("==================chat==============");

        System.out.println("==================Nice to meet you!");

    }

}

ejb bean 通过SpringBeanAutowiringInterceptor.class载入spring 配置，从而调用spring bean。

SpringBeanAutowiringInterceptor默认配置文件为beanRefContext.xml：

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

<beans xmlns="http://www.springframework.org/schema/beans"

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

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:tx="http://www.springframework.org/schema/tx"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

           http://www.springframework.org/schema/context

           http://www.springframework.org/schema/context/spring-context-2.5.xsd

           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">

  <!-- START SNIPPET: annotations -->

  <bean id="factoryKey"

class="org.springframework.context.support.ClassPathXmlApplicationContext">

<constructor-arg value="spring-context.xml"/>

</bean>

</beans>

spring 配置文件为spring-context.xml：

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

<beans xmlns="http://www.springframework.org/schema/beans"

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

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:tx="http://www.springframework.org/schema/tx"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

           http://www.springframework.org/schema/context

           http://www.springframework.org/schema/context/spring-context-2.5.xsd

           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">

  <!-- START SNIPPET: annotations -->

  <context:annotation-config/>

  <bean id="chat" class="com.ejb.test.ChatImpl"/>

</beans>

3 部署

  将此EJB工程打成jar包，比如放在D:\Tomcat\ejb下（注：“D:\Tomcat\ejb”是我自己建的）

  然后打开：Tomcat\conf\openejb.xml,将</openejb>前的内容改为：

   <!--

#

#? The <Deployments> element can be used to configure file

#? paths where OpenEJB should look for ejb jars or ear files.

#

#? See http://openejb.apache.org/deployments.html

#

#? The below entry is simply a default and can be changed or deleted

<Deployments dir="apps/" />原来是这句，我们用不到，可以用下面的语句直接加载指定的ejb jar包。

-->

<Deployments jar="D:/Tomcat/ejb/OpenEjbTest.jar" />

重启Tomcat，在浏览器输入：http://127.0.0.1:8089/openejb/invokeobj.jsp ，即可看到自己的EJB Bean.

4 客户端调用

public class TestCalculator

{

    public static void main(String[] args) throws NamingException {

        try

        {

            Properties p = new Properties();

            //p.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.LocalInitialContextFactory");

            p.put("java.naming.factory.initial", "org.apache.openejb.client.RemoteInitialContextFactory");

            p.put("java.naming.provider.url", "http://localhost/openejb/ejb");

            InitialContext initialContext = new InitialContext(p);

            CalculatorRemote remote =(CalculatorRemote) initialContext.lookup("CalculatorImplRemote");//CalculatorImplRemote

             System.out.println(remote.sum(1, 1));

        }

        catch (javax.naming.NamingException e)

        {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }   

}