100分求jsp調用session ejb的例子,急...

package menutree_client;import java.util.Collection;
import java.util.Iterator;
import java.util.Properties;
import java.util.ArrayList;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
import java.util.List;
import menutree_server.*;public class MenugetContext {  public MenugetContext() {  }  public Iterator getMenuList(){
    List list = new ArrayList();
   try{
     Context context = getInitialContext();
     Object object = context.lookup("MenuSession");
     //menuSessionHome = (MenuSessionHome) PortableRemoteObject.narrow(ref, MenuSessionHome.class);
     //InitialContext initialContext=new InitialContext();
     //Object object=initialContext.lookup("MenuSession");
     MenuSessionHome msh=(MenuSessionHome)PortableRemoteObject.narrow(object,MenuSessionHome.class);
     MenuSession ms=msh.create();
     Collection collection = ms.getAllMenu();
     Iterator iterator = collection.iterator();
     for(;iterator.hasNext();){
       menutree_server.Menu menu = (menutree_server.Menu)iterator.next();
       MenuObject mo = new MenuObject();
       System.out.println(menu.id+" "+menu.fid+" "+menu.xh+" "+menu.name);
       mo.setId(menu.id);
       mo.setFid(menu.fid);
       mo.setXh(menu.xh);
       mo.setName(menu.name);
       mo.setUrl(menu.url);
       mo.setNotes(menu.notes);
       list.add(mo);
     }
   }
   catch(javax.naming.NamingException namingException){
     namingException.printStackTrace();
   }
   catch(javax.ejb.CreateException createException){
     createException.printStackTrace();
   }
   catch(java.rmi.RemoteException remoteException) {
         remoteException.printStackTrace();
   }catch(Exception ex){
     ex.printStackTrace();
   }
   return list.iterator();  }  private Context getInitialContext() throws Exception {
    String url = "t3://localhost:7001";
    String user = "user";
    String password = "password";
    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) {
      //log("Unable to connect to WebLogic server at " + url);
      //log("Please make sure that the server is running.");
      throw e;
    }
  }}

看看这段代码，也许对你有帮助
InitialContext ctx = null;
Object obj = null;
try {
ctx = new InitialContext();
} catch (NamingException e) {
e.printStackTrace();
}
try {
obj = ctx.lookup("java:comp/env/ejb/OrderSessionFacadeRef");
} catch (NamingException e) {
e.printStackTrace();
}
OrderSessionFacadeHome facadeHome =
(OrderSessionFacadeHome) PortableRemoteObject.narrow(
obj,
OrderSessionFacadeHome.class); }

为什么要用JSP调用SESSION BEAN呢,这样做是很不可取的!

先lookup ejbhome，然后create（）ejb对象，剩下得就像bean一样调用了不知我说得对不对

我看到别人得做法都是建立一个XXXutil 类来调用ejb，然后jsp调用xxxutil类。不知我说得对不对

其实调用很简单，在jb中建一个ejbtest，将相关的代码考到jsp中就可以了<%@page import= "javax.naming.*"%>
<%@page import= "nethr.*"%>
<%@page import= "javax.rmi.PortableRemoteObject"%>
<%@page import= "java.util.Vector"%>
<%@page contentType="text/html; charset=Gb2312" %>
<link rel="StyleSheet" href="dtree.css" type="text/css" />
<script type="text/javascript" src="dtree.js"></script>
<html>
<head>
<title>
menutree
</title>
</head><% FacadeSsnHome facadeSsnHome = null;
   FacadeSsn facade = null;   Vector v = new Vector();
   Context ctx = new InitialContext();
   Object ref = ctx.lookup("FacadeSsn");
   facadeSsnHome = (FacadeSsnHome) PortableRemoteObject.narrow(ref,
          FacadeSsnHome.class);
   FacadeSsn obj = facadeSsnHome.create();
   v = obj.getMenrtree();　　//调用sessionbean中的方法
   int vFieldCount = obj.getFieldCount();
    %>
.......package nethr;import javax.ejb.*;
import javax.naming.*;
import java.util.Vector;
import java.util.Collection;
import java.rmi.RemoteException;
import java.util.Iterator;public class FacadeSsnBean
    implements SessionBean {
  final int nFieldCount=3;
  SessionContext sessionContext;
  public Menutree mtree = null;
  private MenutreeHome mtHome = null;
  public void ejbCreate() throws CreateException {
    /**@todo Complete this method*/
    try {
      Context ctx = new InitialContext();
      Object ref = ctx.lookup("java:/comp/env/menutree");
      mtHome = (MenutreeHome) ref;
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }  public void ejbRemove() {
    /**@todo Complete this method*/
  }  public void ejbActivate() {
    /**@todo Complete this method*/
    try {
      Context ctx = new InitialContext();
      Object ref = ctx.lookup("java:/comp/env/menutree");
      mtHome = (MenutreeHome) ref;
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }  }  public void ejbPassivate() {
    /**@todo Complete this method*/
  }  public void setSessionContext(SessionContext sessionContext) {
    this.sessionContext = sessionContext;
  }  public java.util.Vector getMenrtree() {
    /**@todo Complete this method*/
    Menutree mt = null;
    Vector v = new Vector();
    try{
      Iterator i = mtHome.findAll().iterator();
      while(i.hasNext()){
        mt = (Menutree)i.next();
        v.add(mt.getCiId());
        v.add(mt.getCiPid());
        v.add(mt.getCcName());
        //v.add(mt.getCcUrl());
        //v.add(mt.getCcTitle());
        //v.add(mt.getCcTarget());
        //v.add(mt.getCcIcon());
        //v.add(mt.getCcIconopen());
        //v.add(mt.getCiOpen());
      }
      Debug.print("getMenrtree");
    }
    catch(Exception ex){
       ex.printStackTrace();
    }
    return v;  }
  public int getFieldCount() {
    /**@todo Complete this method*/
    return nFieldCount;
  }
}

引用erper(javalearner）：
为什么要用JSP调用SESSION BEAN呢,这样做是很不可取的!偶正在做这方面的应用，想知道怎么不可取？？

调试易

100分求jsp調用session ejb的例子,急...

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