EJB

1, Local/Remote/WebService Bean
Local就是在自己应用中调用。 同一个JVM。 可以传递引用
Remote用RMI的方式调用。值传递


2， Stateful/ Stateless
Stateful 保存实例变量
Stateless 共享实例变量， 单例模式

3， 分布式事务 JTA
在原来调用Bean的基础上加上一个session

[img]http://dl.iteye.com/upload/attachment/0065/6710/7516a968-2ff1-39cf-8058-418372dc5d14.jpg[/img]


[img]http://dl.iteye.com/upload/attachment/0076/2810/430845ce-ffa1-3a39-9665-934fdcd78e4e.jpg[/img]


4, 客户端用main测试EJB服务器端

Hashtable<String, String> environment = new Hashtable<String, String>();
	    environment.put("java.naming.factory.initial","weblogic.jndi.WLInitialContextFactory");
	    environment.put("java.naming.provider.url", "t3://【IP】:25679");
	    environment.put("java.naming.security.principal", "appadmin");
	    environment.put("java.naming.security.credentials", "itrcpwdxx11");

	    Context context= new InitialContext(environment);
	    System.out.println("get naming context:" + context.toString());

	    Object ref = context.lookup("DeviceGroupBean#com.hp.it.sp4ts.devicegroup.DeviceGroupBeanSharedRemote");
	    System.out.println("look up jndi name");
	    System.out.println(ref);

	    DeviceGroupBeanSharedRemote deviceGroupeEJB = (DeviceGroupBeanSharedRemote) ref;
	    DeviceGroupServiceResponse dgResponse = deviceGroupeEJB.getDeviceGroupsByUserGroupId(null, null, null);
	    System.out.println(dgResponse);