Java编程

开发平台：
Java

RoomClient.java：源码内容
							package com.borland.training.meetings.clients;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
import java.util.Collection;
import com.borland.training.meetings.entities.*;
public class RoomClient {
  static RoomRemoteHome roomHome = null;
  static RoomRemote room = null;
  public RoomClient() {
  }
  public static void main(String[] args) {
    if(args.length != 1) {
      usage();
    }
    Object ref;
    try {
      //get naming context
      Context ctx = new InitialContext();
      //look up jndi name
      ref = ctx.lookup("meetings/RoomRemote");
      //cast to Home interface
      roomHome = (RoomRemoteHome) PortableRemoteObject.narrow(ref, RoomRemoteHome.class);
      String command = args[0];
      if(command.equals("create")) {
	create();
      }
      else if(command.equals("use")) {
	use();
      }
      else if(command.equals("remove")) {
	remove();
      }
      else {
	usage();
      }
    }
    catch(Exception e) {
      System.err.println("Exception caught");
      e.printStackTrace();
    }
  }
  private static void create() {
    try {
      String roomName = "1001";
      System.out.println("Creating a new room with room name: " + roomName);
      room = roomHome.create(roomName, 10);
      roomName = "1011";
      System.out.println("Creating a new room with room id: " + roomName);
      room = roomHome.create(roomName, 5);
    }
    catch(Exception e) {
      System.err.println("Exception caught");
      e.printStackTrace();
    }
  }
  private static void use() {
    try {
      String roomName = "1001";
      try {
        room = roomHome.findByPrimaryKey(roomName);
        System.out.println("Room found");
        System.out.println("Room name: " + room.getName());
        System.out.println("Room capacity: " + room.getCapacity());
      }
      catch(javax.ejb.ObjectNotFoundException e) {
        System.out.println("Room not found");
      }
      System.out.println("Listing all rooms");
      java.util.Iterator iterator = roomHome.findAll().iterator();
      if(!iterator.hasNext()) {
        System.out.println("No rooms found");
      }
      while(iterator.hasNext()) {
        RoomRemote room = (RoomRemote)
          javax.rmi.PortableRemoteObject.narrow(iterator.next(), RoomRemote.class);
        System.out.println("Found room: " + room.getName() + ", " + room.getCapacity());
      }
      int minCapacity = 8;
      System.out.println("Listing all rooms with capacity greater than " + minCapacity);
      iterator = roomHome.findRoomsWithCapacityGreaterThan(minCapacity).iterator();
      if(!iterator.hasNext()) {
        System.out.println("No rooms found");
      }
      while(iterator.hasNext()) {
        RoomRemote room = (RoomRemote)
          javax.rmi.PortableRemoteObject.narrow(iterator.next(), RoomRemote.class);
        System.out.println("Found room: " + room.getName() + ", " + room.getCapacity());
      }
      System.out.println("Total capacity of all rooms is " + roomHome.calculateTotalCapacity());
    }
    catch(Exception e) {
      System.err.println("Exception caught");
      e.printStackTrace();
    }
  }
  private static void remove() {
    try {
      System.out.println("Removing all rooms");
      java.util.Iterator iterator = roomHome.findAll().iterator();
      if(!iterator.hasNext()) {
        System.out.println("No rooms");
      }
      while(iterator.hasNext()) {
        RoomRemote room = (RoomRemote)
          javax.rmi.PortableRemoteObject.narrow(iterator.next(), RoomRemote.class);
        System.out.println("Removing room: " + room.getName());
	room.remove();
      }
    }
    catch(Exception e) {
      System.err.println("Exception caught");
      e.printStackTrace();
    }
  }
  private static void usage() {
    System.out.println("Usage: vbj RoomClient create | use | remove");
    System.exit(1);
  }
}

						