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

public class EnrollerClient {

   public static void main(String[] args) {
       try {
           Context initial = new InitialContext();
           Object objref = initial.lookup("java:comp/env/ejb/SimpleStudent");
           StudentHome sHome = 
               (StudentHome)PortableRemoteObject.narrow(objref, 
                                            StudentHome.class);

           Student denise = sHome.create("823", "Denise Smith");

           objref = initial.lookup("java:comp/env/ejb/SimpleCourse");
           CourseHome cHome = 
               (CourseHome)PortableRemoteObject.narrow(objref, 
                                            CourseHome.class);

           Course power = cHome.create("220", "Power J2EE Programming");

           objref = initial.lookup("java:comp/env/ejb/SimpleEnroller");
           EnrollerHome eHome = 
               (EnrollerHome)PortableRemoteObject.narrow(objref, 
                                            EnrollerHome.class);

           Enroller enroller = eHome.create();
           enroller.enroll("823", "220");
           enroller.enroll("823", "333");
           enroller.enroll("823", "777");
           enroller.enroll("456", "777");
           enroller.enroll("388", "777");

           System.out.println(denise.getName() + ":");
           ArrayList courses = denise.getCourseIds();
           Iterator i = courses.iterator();
           while (i.hasNext()) {
              String courseId = (String)i.next();
              Course course = cHome.findByPrimaryKey(courseId);
              System.out.println(courseId + " " + course.getName());
           }
           System.out.println();
 
           Course intro = cHome.findByPrimaryKey("777");
           System.out.println(intro.getName() + ":");
           courses = intro.getStudentIds();
           i = courses.iterator();
           while (i.hasNext()) {
              String studentId = (String)i.next();
              Student student = sHome.findByPrimaryKey(studentId);
              System.out.println(studentId + " " + student.getName());
           }
          
           System.exit(0);

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