servicebrowser.java

HeadFirstCode系列图书里的源代码

import java.awt.*;
import javax.swing.*;
import java.rmi.*;
import java.awt.event.*;



public class ServiceBrowser {

   JPanel mainPanel;
   JComboBox serviceList;
   ServiceServer server;

   public void buildGUI() {
      JFrame frame = new JFrame("RMI Browser");
      mainPanel = new JPanel();
      frame.getContentPane().add(BorderLayout.CENTER, mainPanel);
      
      Object[] services = getServicesList();
  
      serviceList = new JComboBox(services);
      frame.getContentPane().add(BorderLayout.NORTH, serviceList);

      serviceList.addActionListener(new MyListListener());     

      frame.setSize(500,500);
      frame.setVisible(true);

  }

   void loadService(Object serviceSelection) {
       try {
          Service svc = server.getService(serviceSelection);
          
          mainPanel.removeAll();
          mainPanel.add(svc.getGuiPanel());
          mainPanel.validate();
          mainPanel.repaint();
        } catch(Exception ex) {
           ex.printStackTrace();
        }
   }



   Object[] getServicesList() {
      
      Object obj = null;
      Object[] services = null;

      try {
         
         obj = Naming.lookup("rmi://127.0.0.1/ServiceServer");
         
      }
     catch(Exception ex) {
       ex.printStackTrace();
     }
     server = (ServiceServer) obj;
      
    
      try {
        
        services = server.getServiceList();
        
      } catch(Exception ex) {
         ex.printStackTrace();
      }
     return services;
        
   }

   class MyListListener implements ActionListener {
      public void actionPerformed(ActionEvent ev) { 
          // do things to get the selected service
          Object selection =  serviceList.getSelectedItem();
          loadService(selection);
        }
    }

  public static void main(String[] args) {
     new ServiceBrowser().buildGUI();
  }
}