RMI分布式时钟系统的设计与源码

posted @ 2012-11-25 07:27 from [FreedomShe]

    分布式课程的作业据说是百年不变——在我老板还是学生的时候就已经是这个题目了。网上一搜一大堆类似代码，喜欢自己写代码，自己去研究探索学习，作业不难，记录下来给某人做参考。

1. Java界面开发环境： Eclipse + Swing
2. RMI简介
3. 代码结构

---

1. Java界面开发环境： Eclipse + Swing

    Java GUI 工具包主要有AWT, SWT, Swing三种（技术出现先后顺序），用Swing开发界面，代码还是很简洁的。IDE一般选择NetBeans或者Eclipse+插件，如今WindowBuilder被Google收购以后免费了，直接集成在了Eclipse IDE for Java Developers内，下载即可进行Java界面可视化开发。
    Eclipse IDE for Java Developers-Eclipse Juno (4.2) SR1 Packages，下载（只有Eclipse IDE for Java Developers包含WindowBuilder，Eclipse IDE for Java EE Developers等版本均不包含WindowBuilder组件）。

参考：NetBeans VS Eclipse 开发SWT Swing应用

例程开发时Java版本：1.7.0_09

---

2. RMI简介

     RMI即远程调用，它的介绍太多了。通俗点讲，这个过程就是服务器端实例化一个类，然后客户端可以通过RMI绑定IP和端口来调用服务器端的这个实例的方法或变量，就如同这个实例是在客户端一样（实例是在服务器端运行）。客户端通过RMI与服务器端通信只需要知道：服务器端的IP和端口，客户端注册的实例的类的接口。以本地IP为例编程实现简单RMI的一般步骤为：

    1). 服务器端实例化一个类，并将其绑定在一个端口上（建立远程对象注册表，注册实例名等）；
    2). 客户端实例化一个接口（服务器端被调用实例的那个接口，客户端需要预先获得接口定义），而符合该接口定义的实例则是通过RMI远程获得。
    3). 客户端可以远程调用符合这个接口定义的实例了。

    最简单的RMI例程参考：Java RMI之HelloWorld篇

---

3. 代码结构

    本例程的代码结构很清晰，共5个类，IService, ServiceImlp, RmiServer, RmiClient, ServerFrame, ClientFrame。他们的关系如下图：

    可以看到，客户端程序包括IService, RmiClient, ClientFrame三个类，RmiClient封装了RMI远程调用相关的操作；ClientFrame则封装是客户端界面，也是程序的入口；IService是服务器端提供RMI服务的实例的接口类（如同C/C++里面调用一个dll，需要预先知道dll提供导出函数的头文件）。服务器端包括IService, ServiceImlp, RmiServer, ServerFrame四个类，IService前面已讲；ServiceImpl是IService的实现类，服务器端提供服务的实例就是由这个类实例化得到的；RmiServer是服务器端提供RMI服务操作的封装；ServerFrame则封装服务器端的界面。

    IService为服务器端提供服务类实例的接口文件，服务器端必须拥有该接口文件的一个实现类ServiceImlp，最后提供服务的实例就由ServiceImpl实例化；客户端也必须知道该接口文件，以便将RMI实例转换为IService实例使用。

package services;

import java.rmi.Remote;
import java.rmi.RemoteException;

/**
 * 服务接口，客户端调用接口，服务端实现接口
 * @author yuanboshe
 */
public interface IService extends Remote {
    String getDateStr() throws RemoteException;
    String getMessage() throws RemoteException;
}

package server;

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.text.SimpleDateFormat;
import java.util.Date;
import services.IService;

/**
 * 服务接口的实现
 * @author yuanboshe
 */
public class ServiceImpl extends UnicastRemoteObject implements IService {
    private static final long serialVersionUID = 9076175201315559196L;

    public String message = "";

    protected ServiceImpl() throws RemoteException {
        super();
    }

    @Override
    public String getDateStr() throws RemoteException {
        return new SimpleDateFormat("yy-MM-dd hh:mm:ss").format(new Date());
    }

    @Override
    public String getMessage() throws RemoteException {
        return message;
    }
}

    RmiServer是服务器端提供RMI服务的类，这里提供了绑定和取消绑定两个方法（取消绑定后客户端任然可以访问已经申请过的实例，但是不能再申请新的实例）。

package server;

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;

/**
 * 服务端RMI封装װ
 * @author Yuanbo She
 */
public class RmiServer {
    public Registry registry;

    public ServiceImpl service;

    /**
     * 启动RMI服务，需要定义本地IP监听端口
     * @param port �˿ں�
     * @return
     */
    public String bindService(String port) {
        try {
            if (registry != null && registry.list().length > 0) {
                return "Service already have bound!";
            }
            service = new ServiceImpl();
            registry = LocateRegistry.createRegistry(Integer.parseInt(port));
            registry.rebind("service", service);
            return "Binding sucess!";
        } catch (Exception e) {
            e.printStackTrace();
            return "Error:\n" + e.getMessage();
        }
    }

    /**
     * 取消绑定，但是客户端还能继续使用已经绑定的服务端实例，只是不能绑定新的实例
     * @return
     */
    public String unbindService() {
        try {
            if (registry == null || registry.list().length == 0) {
                return "No service have bound!";
            }
            registry.unbind("service");
            UnicastRemoteObject.unexportObject(registry, true);
            return "Unbinding sucess!";
        } catch (Exception e) {
            e.printStackTrace();
            return "Error:\n" + e.getMessage();
        }
    }
}

    RmiClient封装了客户端的RMI操作

package client;

import java.rmi.Naming;
import java.rmi.RemoteException;
import services.IService;

/**
 * 客户端RMI封装
 * @author yuanboshe
 */
public class RmiClient {
    IService service;

    public String setService(String ip, String port) {
        try {
            if (service == null) {
                String url = String.format("rmi://%s:%s/service", ip, port);
                service = (IService) Naming.lookup(url);
                return "Getting service sucess!";
            }
            return "Service already exist!";
        } catch (Exception e) {
            e.printStackTrace();
            return "Binding failed!\n" + e.getMessage();
        }
    }

    public void initService() {
        service = null;
    }

    public String callGetDateStr() throws RemoteException {
        if (service == null) {
            return null;
        }
        return service.getDateStr();
    }

    public String callGetMessage() throws RemoteException {
        if (service == null) {
            return null;
        }
        return service.getMessage();
    }
}

    ServerFrame和ClientFrame分别为服务器端和客户端的界面类，均集成自JFrame，Swing界面编写大体结构类似，一个main函数作为程序入口点，构造函数初始化界面，自己添加一些案件响应函数即可。本例中两个界面类均加入了一个定时器，server端定时器用于刷新时间，client端定时器用于向server端发送调用消息。安装Eclipse IDE for Java Developers后，用WindowBuilder Editor打开继承自JFrame的java文件（Eclipse里右键.java文件，选择Open with WindowBuilder Editor）即可进行可视化界面设计。

package server;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextField;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import java.awt.Font;
import java.awt.Color;
import javax.swing.JTextPane;

/**
 * 服务端界面
 * @author yuanboshe
 */
public class ServerFrame extends JFrame {
    private static final long serialVersionUID = -4596135066244941170L;
    private JPanel contentPane;
    private JTextField txtIp;
    private JTextField txtPort;
    private JLabel labelTime;
    private JTextPane txtpnMessage;
    private final String TIME_FORMAT = "yy-MM-dd hh:mm:ss";
    private RmiServer rmiServer;
    private JTextField txtIntelMessage;
    private Timer updateDateTimer;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    ServerFrame frame = new ServerFrame();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public ServerFrame() {
        setResizable(false);
        setTitle("RMI\u670D\u52A1\u7AEF");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 363, 386);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(new BorderLayout(0, 0));

        JPanel panel = new JPanel();
        contentPane.add(panel);
        GridBagLayout gbl_panel = new GridBagLayout();
        gbl_panel.columnWidths = new int[] { 100, 100, 100, 0 };
        gbl_panel.rowHeights = new int[] { 30, 30, 30, 30, 0, 80, 30, 0 };
        gbl_panel.columnWeights = new double[] { 1.0, 1.0, 1.0, Double.MIN_VALUE };
        gbl_panel.rowWeights = new double[] { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, Double.MIN_VALUE };
        panel.setLayout(gbl_panel);

        JLabel lblip = new JLabel("\u672C\u673AIP\u5730\u5740\uFF1A");
        GridBagConstraints gbc_lblip = new GridBagConstraints();
        gbc_lblip.insets = new Insets(0, 0, 5, 5);
        gbc_lblip.anchor = GridBagConstraints.EAST;
        gbc_lblip.gridx = 0;
        gbc_lblip.gridy = 0;
        panel.add(lblip, gbc_lblip);

        String ip;
        try {
            ip = InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e1) {
            e1.printStackTrace();
            ip = "localhost";
        }
        txtIp = new JTextField();
        txtIp.setEditable(false);
        txtIp.setText(ip);
        GridBagConstraints gbc_txtIp = new GridBagConstraints();
        gbc_txtIp.gridwidth = 2;
        gbc_txtIp.insets = new Insets(0, 0, 5, 0);
        gbc_txtIp.fill = GridBagConstraints.HORIZONTAL;
        gbc_txtIp.gridx = 1;
        gbc_txtIp.gridy = 0;
        panel.add(txtIp, gbc_txtIp);
        txtIp.setColumns(20);

        JLabel label_port = new JLabel("\u8981\u7ED1\u5B9A\u7684\u7AEF\u53E3\u53F7\uFF1A");
        GridBagConstraints gbc_label_port = new GridBagConstraints();
        gbc_label_port.insets = new Insets(0, 0, 5, 5);
        gbc_label_port.anchor = GridBagConstraints.EAST;
        gbc_label_port.gridx = 0;
        gbc_label_port.gridy = 1;
        panel.add(label_port, gbc_label_port);

        txtPort = new JTextField();
        txtPort.setText("1099");
        GridBagConstraints gbc_txtPort = new GridBagConstraints();
        gbc_txtPort.gridwidth = 2;
        gbc_txtPort.insets = new Insets(0, 0, 5, 0);
        gbc_txtPort.fill = GridBagConstraints.HORIZONTAL;
        gbc_txtPort.gridx = 1;
        gbc_txtPort.gridy = 1;
        panel.add(txtPort, gbc_txtPort);
        txtPort.setColumns(20);

        JButton btnReset = new JButton("\u91CD\u7F6E");
        btnReset.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                resetAction(e);
            }
        });
        GridBagConstraints gbc_btnReset = new GridBagConstraints();
        gbc_btnReset.insets = new Insets(0, 0, 5, 5);
        gbc_btnReset.gridx = 0;
        gbc_btnReset.gridy = 2;
        panel.add(btnReset, gbc_btnReset);

        JButton btnStart = new JButton("\u542F\u52A8\u670D\u52A1");
        btnStart.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                startServerAction(e);
            }
        });
        GridBagConstraints gbc_btnStart = new GridBagConstraints();
        gbc_btnStart.insets = new Insets(0, 0, 5, 5);
        gbc_btnStart.anchor = GridBagConstraints.NORTH;
        gbc_btnStart.gridx = 1;
        gbc_btnStart.gridy = 2;
        panel.add(btnStart, gbc_btnStart);

        JButton btnStop = new JButton("\u505C\u6B62\u670D\u52A1");
        btnStop.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                stopServerAction(e);
            }
        });
        GridBagConstraints gbc_btnStop = new GridBagConstraints();
        gbc_btnStop.insets = new Insets(0, 0, 5, 0);
        gbc_btnStop.gridx = 2;
        gbc_btnStop.gridy = 2;
        panel.add(btnStop, gbc_btnStop);

        JLabel label = new JLabel("\u5411\u5BA2\u6237\u7AEF\u53D1\u9001\u4FE1\u606F\uFF1A");
        GridBagConstraints gbc_label = new GridBagConstraints();
        gbc_label.gridwidth = 3;
        gbc_label.anchor = GridBagConstraints.WEST;
        gbc_label.insets = new Insets(0, 0, 5, 5);
        gbc_label.gridx = 0;
        gbc_label.gridy = 3;
        panel.add(label, gbc_label);

        txtIntelMessage = new JTextField();
        GridBagConstraints gbc_txtIntelMessage = new GridBagConstraints();
        gbc_txtIntelMessage.gridwidth = 2;
        gbc_txtIntelMessage.insets = new Insets(0, 0, 5, 5);
        gbc_txtIntelMessage.fill = GridBagConstraints.HORIZONTAL;
        gbc_txtIntelMessage.gridx = 0;
        gbc_txtIntelMessage.gridy = 4;
        panel.add(txtIntelMessage, gbc_txtIntelMessage);
        txtIntelMessage.setColumns(10);

        JButton btnSendMessage = new JButton("\u53D1\u9001");
        btnSendMessage.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                rmiServer.service.message = txtIntelMessage.getText();
            }
        });
        GridBagConstraints gbc_btnSendMessage = new GridBagConstraints();
        gbc_btnSendMessage.insets = new Insets(0, 0, 5, 0);
        gbc_btnSendMessage.gridx = 2;
        gbc_btnSendMessage.gridy = 4;
        panel.add(btnSendMessage, gbc_btnSendMessage);

        labelTime = new JLabel(TIME_FORMAT);
        labelTime.setForeground(new Color(0, 51, 255));
        labelTime.setFont(new Font("Times New Roman", Font.BOLD, 30));
        GridBagConstraints gbc_labelTime = new GridBagConstraints();
        gbc_labelTime.fill = GridBagConstraints.VERTICAL;
        gbc_labelTime.insets = new Insets(0, 0, 5, 0);
        gbc_labelTime.gridwidth = 3;
        gbc_labelTime.gridx = 0;
        gbc_labelTime.gridy = 5;
        panel.add(labelTime, gbc_labelTime);

        txtpnMessage = new JTextPane();
        txtpnMessage.setEditable(false);
        txtpnMessage.setText("Message...");
        txtpnMessage.setFont(new Font("Times New Roman", Font.ITALIC, 14));
        txtpnMessage.setForeground(new Color(255, 0, 0));
        GridBagConstraints gbc_txtpnMessage = new GridBagConstraints();
        gbc_txtpnMessage.gridwidth = 3;
        gbc_txtpnMessage.fill = GridBagConstraints.BOTH;
        gbc_txtpnMessage.gridx = 0;
        gbc_txtpnMessage.gridy = 6;
        panel.add(txtpnMessage, gbc_txtpnMessage);
    }

    /**
     * 设置定时器任务
     * @author Yuanbo She
     */
    protected class MyTimerTask extends TimerTask {
        @Override
        public void run() {
            String time = new SimpleDateFormat(TIME_FORMAT).format(Calendar.getInstance().getTime());
            labelTime.setText(time);
        }
    }

    private void startTimer() {
        if (updateDateTimer == null) {
            updateDateTimer = new Timer();
        }
        updateDateTimer.scheduleAtFixedRate(new MyTimerTask(), new Date(), 800);
    }

    private void stopTimer() {
        if (updateDateTimer != null) {
            updateDateTimer.cancel();
            updateDateTimer = null;
        }
    }

    public void startServerAction(ActionEvent e) {
        if (rmiServer == null) {
            rmiServer = new RmiServer();
        }
        txtpnMessage.setText(rmiServer.bindService(txtPort.getText()));
        startTimer();
    }

    public void stopServerAction(ActionEvent e) {
        if (rmiServer == null) {
            txtpnMessage.setText("Bound nothing, please start service first!");
            return;
        }
        txtpnMessage.setText(rmiServer.unbindService());
        stopTimer();
    }

    public void resetAction(ActionEvent e) {
        txtIp.setText("localhost");
        txtPort.setText("1099");
        txtpnMessage.setText("Message...");
        txtIntelMessage.setText("");
        rmiServer.service.message = "";
    }
}

package client;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextField;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Font;
import java.awt.Color;
import java.rmi.RemoteException;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JTextPane;

/**
 * 客户端界面
 * @author yuanboshe
 */
public class ClientFrame extends JFrame {
    private static final long serialVersionUID = 4640407835597561733L;
    private JPanel contentPane;
    private JTextField txtIp;
    private JTextField txtPort;
    private JLabel lblTime;
    private JTextPane txtPnMessage;
    private RmiClient rmiClient;
    private JTextField txtIntelMessage;
    private Timer timer;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    ClientFrame frame = new ClientFrame();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public ClientFrame() {
        setResizable(false);
        setTitle("RMI\u5BA2\u6237\u7AEF");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 377, 399);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(new BorderLayout(0, 0));

        JPanel panel = new JPanel();
        contentPane.add(panel);
        GridBagLayout gbl_panel = new GridBagLayout();
        gbl_panel.columnWidths = new int[] { 120, 120, 120, 0 };
        gbl_panel.rowHeights = new int[] { 30, 30, 30, 30, 30, 80, 0, 0 };
        gbl_panel.columnWeights = new double[] { 0.0, 1.0, 1.0, Double.MIN_VALUE };
        gbl_panel.rowWeights = new double[] { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, Double.MIN_VALUE };
        panel.setLayout(gbl_panel);

        JLabel lblip = new JLabel("\u670D\u52A1\u5668IP\uFF1A");
        GridBagConstraints gbc_lblip = new GridBagConstraints();
        gbc_lblip.insets = new Insets(0, 0, 5, 5);
        gbc_lblip.anchor = GridBagConstraints.EAST;
        gbc_lblip.gridx = 0;
        gbc_lblip.gridy = 0;
        panel.add(lblip, gbc_lblip);

        txtIp = new JTextField();
        txtIp.setText("localhost");
        GridBagConstraints gbc_txtIp = new GridBagConstraints();
        gbc_txtIp.gridwidth = 2;
        gbc_txtIp.insets = new Insets(0, 0, 5, 0);
        gbc_txtIp.fill = GridBagConstraints.HORIZONTAL;
        gbc_txtIp.gridx = 1;
        gbc_txtIp.gridy = 0;
        panel.add(txtIp, gbc_txtIp);
        txtIp.setColumns(20);

        JLabel label_port = new JLabel("\u670D\u52A1\u5668\u7AEF\u53E3\u53F7\uFF1A");
        GridBagConstraints gbc_label_port = new GridBagConstraints();
        gbc_label_port.insets = new Insets(0, 0, 5, 5);
        gbc_label_port.anchor = GridBagConstraints.EAST;
        gbc_label_port.gridx = 0;
        gbc_label_port.gridy = 1;
        panel.add(label_port, gbc_label_port);

        txtPort = new JTextField();
        txtPort.setText("1099");
        GridBagConstraints gbc_txtPort = new GridBagConstraints();
        gbc_txtPort.gridwidth = 2;
        gbc_txtPort.insets = new Insets(0, 0, 5, 0);
        gbc_txtPort.fill = GridBagConstraints.HORIZONTAL;
        gbc_txtPort.gridx = 1;
        gbc_txtPort.gridy = 1;
        panel.add(txtPort, gbc_txtPort);
        txtPort.setColumns(20);

        JButton btnStart = new JButton("\u8FDE\u63A5\u670D\u52A1\u5668\u5E76\u542F\u52A8");
        btnStart.addActionListener(new BtnStartAction());
        JButton btnReset = new JButton("\u91CD\u7F6E\u6D88\u606F");
        btnReset.addActionListener(new BtnResetAction());
        GridBagConstraints gbc_btnReset = new GridBagConstraints();
        gbc_btnReset.insets = new Insets(0, 0, 5, 5);
        gbc_btnReset.gridx = 0;
        gbc_btnReset.gridy = 2;
        panel.add(btnReset, gbc_btnReset);
        GridBagConstraints gbc_btnStart = new GridBagConstraints();
        gbc_btnStart.gridwidth = 2;
        gbc_btnStart.insets = new Insets(0, 0, 5, 0);
        gbc_btnStart.gridx = 1;
        gbc_btnStart.gridy = 2;
        panel.add(btnStart, gbc_btnStart);

        JLabel label = new JLabel("\u670D\u52A1\u5668\u4F20\u6765\u7684\u4FE1\u606F\uFF1A");
        GridBagConstraints gbc_label = new GridBagConstraints();
        gbc_label.anchor = GridBagConstraints.EAST;
        gbc_label.insets = new Insets(0, 0, 5, 5);
        gbc_label.gridx = 0;
        gbc_label.gridy = 3;
        panel.add(label, gbc_label);

        txtIntelMessage = new JTextField();
        txtIntelMessage.setEditable(false);
        GridBagConstraints gbc_txtIntelMessage = new GridBagConstraints();
        gbc_txtIntelMessage.gridwidth = 2;
        gbc_txtIntelMessage.insets = new Insets(0, 0, 5, 5);
        gbc_txtIntelMessage.fill = GridBagConstraints.HORIZONTAL;
        gbc_txtIntelMessage.gridx = 1;
        gbc_txtIntelMessage.gridy = 3;
        panel.add(txtIntelMessage, gbc_txtIntelMessage);
        txtIntelMessage.setColumns(10);

        JLabel label_1 = new JLabel("\u670D\u52A1\u5668\u540C\u6B65\u6765\u7684\u65F6\u95F4\uFF1A");
        GridBagConstraints gbc_label_1 = new GridBagConstraints();
        gbc_label_1.anchor = GridBagConstraints.WEST;
        gbc_label_1.gridwidth = 3;
        gbc_label_1.insets = new Insets(0, 0, 5, 5);
        gbc_label_1.gridx = 0;
        gbc_label_1.gridy = 4;
        panel.add(label_1, gbc_label_1);

        lblTime = new JLabel("yy-MM-dd hh:mm:ss");
        lblTime.setForeground(new Color(0, 51, 255));
        lblTime.setFont(new Font("Times New Roman", Font.BOLD, 30));
        GridBagConstraints gbc_lblTime = new GridBagConstraints();
        gbc_lblTime.insets = new Insets(0, 0, 5, 0);
        gbc_lblTime.gridwidth = 3;
        gbc_lblTime.gridx = 0;
        gbc_lblTime.gridy = 5;
        panel.add(lblTime, gbc_lblTime);

        txtPnMessage = new JTextPane();
        txtPnMessage.setText("Message...");
        txtPnMessage.setForeground(Color.RED);
        txtPnMessage.setFont(new Font("Times New Roman", Font.ITALIC, 14));
        txtPnMessage.setEditable(false);
        GridBagConstraints gbc_txtPnMessage = new GridBagConstraints();
        gbc_txtPnMessage.gridwidth = 3;
        gbc_txtPnMessage.fill = GridBagConstraints.BOTH;
        gbc_txtPnMessage.gridx = 0;
        gbc_txtPnMessage.gridy = 6;
        panel.add(txtPnMessage, gbc_txtPnMessage);

        rmiClient = new RmiClient();
    }

    protected class BtnResetAction implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            lblTime.setText("yy-MM-dd hh:mm:ss");
            txtIp.setText("localhost");
            txtPort.setText("1099");
        }
    }

    protected class BtnStartAction implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            txtPnMessage.setText(rmiClient.setService(txtIp.getText(), txtPort.getText()));
            // 增加定时器
            if (timer == null) {
                timer = new Timer();
            }
            timer.scheduleAtFixedRate(new MyTimerTask(), new Date(), 1000);
        }
    }

    // 定时器定时执行的任务
    protected class MyTimerTask extends TimerTask {
        @Override
        public void run() {
            try {
                lblTime.setText(rmiClient.callGetDateStr());
                txtIntelMessage.setText(rmiClient.callGetMessage());
            } catch (RemoteException e) {
                e.printStackTrace();
                timer.cancel();
                timer = null;
                rmiClient.initService();
                txtPnMessage.setText("Error:\n" + e.getMessage());
            }
        }
    }
}

    以上是全部源码，按照services, client, server三包结构存放即可。

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