Jboss4.x下第一個EJB2.x程序

EJB的名聲很不好，尤其在Spring框架出現以後，而EJB3似乎脫胎換骨了。而我現在學習的仍然是EJB2，原因是EJB3的書很難找。暑假時大概把《精通EJB》和《EJB》這兩本書看過一下，現在想復習，加深理解，就從第一個HelloWorld開始。

文件結構：

E:.

│ build.XML

│

└─src

├─META-INF

│ application.XML

│ ejb-jar.XML

│ jboss.XML

│

├─powerwind

│ ClIEntServlet.Java

│ Hello.Java

│ HelloBean.Java

│ HelloHome.Java

│

└─WEB-INF

jboss-web.XML

web.XML

ant文件

build.XML

todir="${jboss.home}/server/default/deploy" />

Java源文件

Hello.Java

package powerwind;

import Java.rmi.RemoteException;

import Javax.ejb.EJBObject;

publicinterface Hello extends EJBObject {

public String sayHello() throws RemoteException;

}

HelloHome.Java

package powerwind;

import Java.rmi.RemoteException;

import Javax.ejb.CreateException;

import Javax.ejb.EJBHome;

publicinterface HelloHome extends EJBHome {

public Hello create() throws RemoteException, CreateException;

}

HelloBean.Java

package powerwind;

import Java.rmi.RemoteException;

import Javax.ejb.EJBException;

import Javax.ejb.SessionBean;

import Javax.ejb.SessionContext;

publicclass HelloBean implements SessionBean {

private SessionContext context;

publicvoid ejbCreate() throws EJBException, RemoteException {

}

publicvoid ejbActivate() throws EJBException, RemoteException {

}

publicvoid ejbPassivate() throws EJBException, RemoteException {

}

publicvoid ejbRemove() throws EJBException, RemoteException {

}

publicvoid setSessionContext(SessionContext newContext)

throws EJBException {

context = newContext;

}

public String sayHello() throws EJBException {

return"Hello from ejb";

}

}

用於測試的Servlet

ClIEntServlet.Java

package powerwind;

import Java.io.IOException;

import Java.io.PrintWriter;

import Javax.naming.InitialContext;

import Javax.rmi.PortableRemoteObject;

import Javax.servlet.ServletException;

import Javax.servlet.http.HttpServlet;

import Javax.servlet.http.HttpServletRequest;

import Javax.servlet.http.HttpServletResponse;

publicclass ClIEntServlet extends HttpServlet {

publicvoid doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/Html");

PrintWriter out = response.getWriter();

String message = null;

try {

InitialContext ic = new InitialContext();

Object obj = ic.lookup("HelloEJB");

HelloHome home = (HelloHome) PortableRemoteObject.narrow(obj,

powerwind.HelloHome.class);

Hello hello = home.create();

message = hello.sayHello();

} catch (Exception e) {

e.printStackTrace();

}

out.println(message);

out.flush();

out.close();

}

publicvoid doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request, response);

}

}