counterclient.java

Java the UML Way 书中所有源码

/*
 * CounterClient.java   E.L. 2001-08-25
 *
 * Here is main() at the client side.
 * Contact with the server side is established, and callback object is created.
 */

import java.rmi.*;
import java.rmi.server.*;
import javax.swing.*;

class CounterClient implements Constants {

  public static void main(String[] args) throws Exception {
    YesNoCounterFront counter = null;
    boolean counterFound = false;
    do {  // try to establish contact with the server
      try {
        String nameServerMachine = JOptionPane.showInputDialog(null,
          "What's the name of the server machine? ");
        String url = "rmi://" + nameServerMachine + "/";
        counter = (YesNoCounterFront) Naming.lookup(url + counterName);
        counterFound = true;
      } catch (NotBoundException e) {
        JOptionPane.showMessageDialog(null, "The Counter object is not found, " + e);
      } catch (UnknownHostException e) {
        JOptionPane.showMessageDialog(null, "Unknown machine, " + e);
      } catch (java.net.MalformedURLException e) {
        JOptionPane.showMessageDialog(null, "Invalid name format, " + e);
      } catch (Exception e) {
        JOptionPane.showMessageDialog(null, "Error: " + e);
      }
    } while (!counterFound);

    try {
      String clientName = JOptionPane.showInputDialog(null, "What's your name:");
      System.out.println("Status for " + clientName);

      /* This object runs in its own thread which receives messages from the server. */
      Client thisClient = new ClientImpl(clientName);

      counter.registerMe(thisClient);

      /* Sets up the input window */
      CounterWindow window = new CounterWindow(counter, thisClient);
      window.setLocation(locationCountWindowX, locationCountWindowY);
      window.pack();
      window.setVisible(true);
    } catch (Exception e) {
      System.out.println("Error in main(): " + e);
    }
  }
}