orderclient.java

卡内基梅隆大学软件工程课件,很全面

/*
 *
 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

import java.util.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;

public class OrderClient {

   public static void main(String[] args) {

      try {

         ArrayList lineItems = new ArrayList();
         lineItems.add(new LineItem("p23", 13, 12.00, 1, "123"));
         lineItems.add(new LineItem("p67", 47, 89.00, 2, "123"));
         lineItems.add(new LineItem("p11", 28, 41.00, 3, "123"));

         Context initial = new InitialContext();
         Object objref = initial.lookup("java:comp/env/ejb/SimpleOrder");

         OrderHome home = 
             (OrderHome)PortableRemoteObject.narrow(objref, 
                                          OrderHome.class);

         System.out.println("about to create");
         Order duke = home.create("123", "c44", "open", 
            totalItems(lineItems), lineItems);

         displayItems(duke.getLineItems());
         System.out.println();

         Collection c = home.findByProductId("p67");
         Iterator i=c.iterator();

         while (i.hasNext()) {
            Order order = (Order)i.next();
            String id = (String)order.getPrimaryKey();
            System.out.println(id);
         }

         System.exit(0);

      } catch (Exception ex) {
          System.err.println("Caught an exception." );
          ex.printStackTrace();
      }
   } 

   static double totalItems(ArrayList lineItems) {

      double total = 0.00;
      ListIterator iterator = lineItems.listIterator(0);
      while (iterator.hasNext()) {
         LineItem item = (LineItem)iterator.next();
         total += item.getUnitPrice();
      }
      return total;
   }

   static void displayItems(ArrayList lineItems) {

      ListIterator iterator = lineItems.listIterator(0);
      while (iterator.hasNext()) {
         LineItem item = (LineItem)iterator.next();
         System.out.println(item.getOrderId() + " " +
                            item.getItemNo() + " " +
                            item.getProductId() + " " +
                            item.getUnitPrice());
      }
   }
}