weatherserviceclient.java

高级java2 大学教程(含源码,经典的Java学习教程

// WeatherServiceClient.java 
// WeatherServiceClient uses the WeatherService remote object
// to retrieve weather information.
package com.deitel.advjhtp1.rmi.weather;

// Java core packages
import java.rmi.*;   
import java.util.*;

// Java extension packages
import javax.swing.*;

public class WeatherServiceClient extends JFrame
{
   // WeatherServiceClient constructor
   public WeatherServiceClient( String server ) 
   {
      super( "RMI WeatherService Client" ); 
      
      // connect to server and get weather information
      try {

         // name of remote server object bound to rmi registry
         String remoteName = "rmi://" + server + "/WeatherService";

         // lookup WeatherServiceImpl remote object
         WeatherService weatherService = 
            ( WeatherService ) Naming.lookup( remoteName );

         // get weather information from server
         List weatherInformation = new ArrayList( 
            weatherService.getWeatherInformation() );   

         // create WeatherListModel for weather information
         ListModel weatherListModel = 
            new WeatherListModel( weatherInformation );

         // create JList, set ListCellRenderer and add to layout
         JList weatherJList = new JList( weatherListModel );
         weatherJList.setCellRenderer( new WeatherCellRenderer() );
         getContentPane().add( new JScrollPane( weatherJList ) );

      } // end try
      
      // handle exception connecting to remote server
      catch ( ConnectException connectionException ) {
         System.err.println( "Connection to server failed. " +
            "Server may be temporarily unavailable." );
         
         connectionException.printStackTrace();
      }
      
      // handle exceptions communicating with remote object
      catch ( Exception exception ) {
         exception.printStackTrace();
      }
      
   } // end WeatherServiceClient constructor

   // execute WeatherServiceClient
   public static void main( String args[] )
   {
      WeatherServiceClient client = null;

      // if no sever IP address or host name specified,
      // use "localhost"; otherwise use specified host
      if ( args.length == 0 )
         client = new WeatherServiceClient( "localhost" );
      else
         client = new WeatherServiceClient( args[ 0 ] );

      // configure and display application window
      client.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      client.pack();
      client.setResizable( false ); 
      client.setVisible( true );  
   }
}

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