基于Java的实例源码-各种EJB之间的调用示例.zip

package interejbs; //Download by http://www.codefans.net import javax.ejb.*; import javax.naming.*; import java.util.Properties; import javax.rmi.PortableRemoteObject; public class firstEJBBean implements SessionBean { SessionContext sessionContext; private secondEJBHome secondEJBHomeObject = null; public void ejbCreate() throws CreateException { try { //得到名字上下文 Context ctx = getInitialContext(); //查询jndi名 Object ref = ctx.lookup("secondEJB"); //通过强制转型得到Home接口 secondEJBHomeObject = (secondEJBHome) PortableRemoteObject.narrow(ref, secondEJBHome.class); } catch(Exception e) { e.printStackTrace(); } } public void ejbRemove() { } public void ejbActivate() { } public void ejbPassivate() { } public void setSessionContext(SessionContext sessionContext) { this.sessionContext = sessionContext; } //这个函数返回一个经过初始化的上下文 private Context getInitialContext() throws Exception { String url = "t3://cgb-4wn01xj69v6:7001"; String user = null; String password = null; Properties properties = null; try { properties = new Properties(); properties.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory"); properties.put(Context.PROVIDER_URL, url); if (user != null) { properties.put(Context.SECURITY_PRINCIPAL, user); properties.put(Context.SECURITY_CREDENTIALS, password == null ? "" : password); } return new InitialContext(properties); } catch(Exception e) { throw e; } } //这个函数将调用secondEJB public String MyPrint() { String ret="This is a example for interEJBS:\n"; ret=ret+"This is firstEJB,now calling secondEJB\n"; try { secondEJB secondEJB=secondEJBHomeObject.create(); ret=secondEJB.forFirst(ret)+"example is over!\n"; } catch(Exception e) { e.printStackTrace(); } return ret; } //这个函数将被secondEJB调用 public String forSecond(String fromSecond) { fromSecond=fromSecond+"This is firstEJB called by secondEJB\n"; return fromSecond; } }