Java: RMI调用实例2

服务端的接口

package practice;

import java.rmi.*;

public interface ServiceServer extends Remote ...{
    Object[] getServiceList() throws RemoteException;
    Service getService(Object serviceKey) throws RemoteException;
}

服务端实现

package practice;

import java.util.*;
import java.rmi.*;
import java.rmi.server.*;
 
public class ServiceServerImpl extends UnicastRemoteObject implements ServiceServer...{
    private static final long serialVersionUID = -4807659989722643845L;
    HashMap<String, Object> serviceList;
    public ServiceServerImpl() throws RemoteException...{
        setUpServices();
    }
    private void setUpServices()...{
        serviceList = new HashMap<String, Object>();
        serviceList.put("Dice Rolling Service", new DiceService());
        serviceList.put("Day of week service", new DayOfWeekService());
        //serviceList.put("Visual Music Service", new MiniMusicService());
    }
    
    public Service getService(Object key) throws RemoteException...{
        return (Service)serviceList.get(key);
    }
    
    public Object[] getServiceList() throws RemoteException...{
        return serviceList.keySet().toArray();
    }
    
    public static void main(String[] args)...{
        try...{
            ServiceServerImpl server = new ServiceServerImpl();
            Naming.rebind("ServiceServerX", server);
        }catch(Exception e)...{
            e.printStackTrace();
        }
    }
}

 
客户端实现

package practice;

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

public class ServiceBrowser ...{
    JPanel panel;
    ServiceServer server;
    JComboBox serviceList;
    
    public static void main(String[] args)...{
        new ServiceBrowser().go();
    }
    
    private void  go()...{
        buildGUI();
    }
     
    private void buildGUI()...{
        JFrame frame = new JFrame("RMI Browser");
        panel = new JPanel();
        
        Object[] services = getServiceList();
        serviceList = new JComboBox(services);
        serviceList.addActionListener(new ChooseActionListener());
        
        frame.getContentPane().add(BorderLayout.CENTER, panel);
        frame.getContentPane().add(BorderLayout.NORTH, serviceList);
        
        frame.setSize(400, 500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
    
    private Object[] getServiceList()...{
        Object[] serviceList = null;
        try...{
            server = (ServiceServer)Naming.lookup("ServiceServerX");
            serviceList = server.getServiceList();
        }catch(Exception e)...{
            e.printStackTrace();
        }
        return serviceList;
    }
    
    class ChooseActionListener implements ActionListener...{
        public void actionPerformed(ActionEvent evetn)...{
            loadService(serviceList.getSelectedItem());
        }
    }
    
    private void loadService(Object selection)...{
        try...{
            Service service = server.getService(selection);
            panel.removeAll();
            panel.add(service.getGuiPanel());
            panel.validate();
            panel.repaint();
        }catch(Exception e)...{
            e.printStackTrace();
        }
    }
}

服务接口

package practice;
 
import javax.swing.*;
import java.io.*;

public interface Service extends Serializable...{
    public JPanel getGuiPanel();
}

服务

package practice;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class DiceService implements Service...{
    private static final long serialVersionUID = 9088576826000018846L;
    JLabel result;
    JComboBox diceNum;
    public JPanel getGuiPanel()...{
        JPanel panel = new JPanel();
        
        String[] choice = ...{"1", "2", "3", "4", "5"};
        diceNum = new JComboBox(choice);
        
        JButton startButton = new JButton("Start Roll");
        startButton.addActionListener(new CreateDiceActionListener());
        
        result = new JLabel("Please Click Start Roll");
        
        panel.add(diceNum);
        panel.add(startButton);
        panel.add(result);
        return panel;
    } 
    class CreateDiceActionListener implements ActionListener...{
        public void actionPerformed(ActionEvent event)...{
            result.setText(getRandomNum(diceNum.getSelectedItem()));
        }
    }
    
    private String getRandomNum(Object Num)...{
        try...{
            int diceNum = Integer.parseInt((String)Num);
            String result = "";
            for(int i=0 ;i<diceNum; i++)...{
                result += (int)(Math.random()*6) + "  ";
            }
            return result;
        }catch(Exception e)...{
            e.printStackTrace();
        }
        return null;
    }
}

服务2

package practice;

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class DayOfWeekService implements Service...{
    JLabel result;
    JComboBox year;
    JComboBox month;
    JComboBox day;
    
    public JPanel getGuiPanel()...{
        JPanel panel = new JPanel();
        
        JPanel innerPanel = new JPanel(new GridLayout(3,2));
        
        year = new JComboBox(getArray(1950,2007));
        month = new JComboBox(getArray(1,12));
        day = new JComboBox(getArray(1,31));
        innerPanel.add(new JLabel("Year"));
        innerPanel.add(year);
        innerPanel.add(new JLabel("Month"));
        innerPanel.add(month);
        innerPanel.add(new JLabel("Day"));
        innerPanel.add(day);
        
        JButton startButton = new JButton("Start Compute");
        startButton.addActionListener(new ComputeWeekActionListener());
        
        result = new JLabel();
        
        panel.add(innerPanel);
        panel.add(startButton);
        panel.add(result);
        
        return panel;
    }
    class ComputeWeekActionListener implements ActionListener...{
        public void actionPerformed(ActionEvent event)...{
            result.setText(getWeek());
        }
    }
    
    private Object[] getArray(int start, int stop)...{
        ArrayList<Integer> list = new ArrayList<Integer>();
        for(int i=start;i<=stop;i++)...{
            list.add(i);
        }
        return list.toArray();
    }
    
    private String getWeek()...{
        try...{
            int y = getSelectedInt(year);
            int m = getSelectedInt(month);
            int d = getSelectedInt(day);
            Calendar c = Calendar.getInstance();
            c.setTime(new Date());
            
            c.set(Calendar.MONTH, m-1);
            c.set(Calendar.DAY_OF_MONTH, d);
            c.set(Calendar.YEAR, y);
            
            
            Date date = c.getTime();
            return (new SimpleDateFormat("EEEE")).format(date);
        }catch(Exception e)...{
            e.printStackTrace();
        }
        return null;
    }
    
    private int getSelectedInt(JComboBox in)...{
        return (Integer)in.getSelectedItem();
    }
    
    
}