import java.awt.BorderLayout;  
import java.awt.FlowLayout;  
import java.awt.Font;  
import java.awt.Frame;  
import java.awt.GridLayout;  
import java.awt.event.ActionEvent;  
import java.awt.event.ActionListener;  
import java.awt.event.KeyEvent;  
import java.awt.event.KeyListener;  
import java.io.IOException;  
import java.text.DateFormat;  
import java.text.SimpleDateFormat;  
import java.util.Calendar;  
import java.util.Timer;  
import java.util.TimerTask;  
   
import javax.sound.sampled.AudioInputStream;  
import javax.sound.sampled.AudioSystem;  
import javax.sound.sampled.Clip;  
import javax.sound.sampled.LineEvent;  
import javax.sound.sampled.LineListener;  
import javax.sound.sampled.LineUnavailableException;  
import javax.sound.sampled.UnsupportedAudioFileException;  
import javax.swing.JButton;  
import javax.swing.JDialog;  
import javax.swing.JFrame;  
import javax.swing.JLabel;  
import javax.swing.JPanel;  
import javax.swing.JTextField;  
  
public class AlarmClock extends JFrame implements ActionListener {  
    private static final int LOOP_COUNT = 5; // 重复播放的次数  
    private JLabel labelClock, labelAlarm, labelNextAlarm;  
    private JButton btnSet, btnClose;  
    private SetDialog setDialog;  
    private JPanel topPanel, alarmPanel;  
    private Timer timer;  
    private Clip clip;  
    private Calendar alarmCal;  
    private boolean timeReached = true;  
    private DateFormat df = new SimpleDateFormat("HH : mm");  
       
    public AlarmClock() {  
        super("闹钟");  
    }  
       
    public void launch() {  
        setSize(400, 300);  
        setVisible(true);  
        setDefaultCloseOperation(EXIT_ON_CLOSE);  
           
        getContentPane().setLayout(new BorderLayout()); // 利用边界布局将界面分割成上中下三部分  
        labelAlarm = new JLabel("闹钟定时已到！");  
        btnClose = new JButton("确定");  
        labelNextAlarm = new JLabel(); // 指示下一次闹钟时间  
        alarmPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); // 顶部提示栏提示闹钟时间已到，和确定按钮  
        alarmPanel.add(labelAlarm);  
        alarmPanel.add(btnClose);  
           
        topPanel = new JPanel(new GridLayout(2, 1));  
        topPanel.add(alarmPanel);  
        topPanel.add(labelNextAlarm);  
        alarmPanel.setVisible(false); // 初始隐藏顶部提示栏  
           
        labelClock = new JLabel();  
        Font font = new Font(Font.SERIF, Font.PLAIN, 48); // 中间的倒计时文本用大号字体展示  
        labelClock.setFont(font);  
        labelClock.setHorizontalAlignment(JLabel.CENTER); // 文本居中  
        btnSet = new JButton("设置");  
           
        getContentPane().add(topPanel, BorderLayout.NORTH); // 界面顶部  
        getContentPane().add(labelClock, BorderLayout.CENTER); // 界面中部  
        getContentPane().add(btnSet, BorderLayout.SOUTH); // 界面底部  
           
        btnSet.addActionListener(this); // 设置按钮的点击事件  
        btnClose.addActionListener(this); // 顶部确定按钮的点击事件  
        setLocationRelativeTo(null); // 界面居中  
        setDialog = new SetDialog(this); // 初始化设置对话框  
   
        try { // 初始化闹钟声音  
            // 目前发现wav格式的文件是可以支持的，mp3不支持  
            AudioInputStream ais = AudioSystem.getAudioInputStream(  
                    AlarmClock.class.getResource("music.wav"));  
            clip = AudioSystem.getClip();  
            clip.open(ais);  
            ais.close();  
            int loop = LOOP_COUNT <= 0 ? 1 : LOOP_COUNT;  
            final long totalFrames = ais.getFrameLength() * loop;  
            clip.addLineListener(new LineListener() {  
                public void update(LineEvent e) {  
                    // 当闹钟音乐播放结束时，自动隐藏顶部提示栏  
                    if(e.getFramePosition() >= totalFrames) {  
                        stopAlarm();  
                    }  
                }  
            });  
        } catch (UnsupportedAudioFileException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        } catch (LineUnavailableException e) {  
            e.printStackTrace();  
        }  
        initTimer();  
    }  
   
    public static void main(String[] args) {  
        new AlarmClock().launch(); // 启动主界面  
    }  
   
    public void actionPerformed(ActionEvent e) {  
        Object source = e.getSource();  
        if(source == btnSet) { // 点击设置按钮时弹出设置界面，以模对话框显示  
            setDialog.setVisible(true);  
        } else if(source == btnClose) { // 点击顶部确定按钮时隐藏顶部提示栏  
            stopAlarm();  
        }  
    }  
       
    private void initTimer() {  
        timer = new Timer(); // 初始化倒计时任务  
        // 开始倒计时  
        timer.scheduleAtFixedRate(new TimerTask() {  
            @Override  
            public void run() {  
                Calendar cal = Calendar.getInstance();  
                int hour = cal.get(Calendar.HOUR_OF_DAY);  
                int min = cal.get(Calendar.MINUTE);  
                int sec = cal.get(Calendar.SECOND);  
                // 设置倒计时文本  
                labelClock.setText(String.format("%02d : %02d : %02d", hour, min, sec));  
                if(null != alarmCal && !timeReached) {  
                    int alarmHour = alarmCal.get(Calendar.HOUR_OF_DAY);  
                    int alarmMin = alarmCal.get(Calendar.MINUTE);  
                    if(alarmHour == hour && alarmMin == min) { // 到时间时播放声音  
                        timeReached = true;  
                        System.out.println("Time over");  
                        startAlarm();  
                    }  
                }  
            }  
        }, 0, 1000L); // 每隔1秒刷新倒计时文本  
    }  
       
    /** 
     * 开始计时 
     * @param hour 
     * @param minute 
     */  
    public void startTimer(int hour, int minute) {  
        alarmCal = Calendar.getInstance();  
        alarmCal.set(Calendar.HOUR_OF_DAY, hour);  
        alarmCal.set(Calendar.MINUTE, minute);  
        labelNextAlarm.setText("下次闹钟时间：" + df.format(alarmCal.getTime()));  
        timeReached = false;  
    }  
       
    /** 
     * 取消倒计时任务 
     */  
    public void cancelTimer() {  
        labelNextAlarm.setText("");  
        alarmCal = null;  
    }  
       
    private void startAlarm() { // 开始播放提示音  
        if(null != clip) {  
            alarmPanel.setVisible(true); // 显示顶部提示栏  
            clip.setFramePosition(0); // 将音频帧重置为第0帧  
            clip.loop(LOOP_COUNT); // 开始循环播放  
        }  
        labelNextAlarm.setText("");  
    }  
    private void stopAlarm() { // 停止播放提示音  
        if(null != clip && clip.isRunning()) {  
            clip.stop(); // 结束播放  
        }  
        labelNextAlarm.setText("");  
        alarmPanel.setVisible(false); // 隐藏顶部提示栏  
    }  
       
    /** 
     * 闹钟设置页面 
     */  
    class SetDialog extends JDialog implements KeyListener, ActionListener {  
        private JLabel labelHour, labelMin;  
        private JTextField textHour, textMin;  
        private JPanel mainPanel, labelPanel, buttonPanel;  
        private JButton btnOk, btnCancel, btnBack;  
        private Calendar cal = Calendar.getInstance();  
           
        public SetDialog(Frame frame) {  
            super(frame);  
            setTitle("设置");  
            setModal(true); // 设置为模窗口，就是说在本弹窗未消失时不允许点击主界面。  
            setSize(300, 150);  
            // 显示时分  
            labelHour = new JLabel("时");  
            labelMin = new JLabel("分");  
            labelHour.setHorizontalAlignment(JLabel.CENTER);  
            labelMin.setHorizontalAlignment(JLabel.CENTER);  
            textHour = new JTextField();  
            textMin = new JTextField();  
            // 上面的部分用网格布局将各组件以2x2的格子放进去  
            labelPanel = new JPanel(new GridLayout(2, 2));  
            labelPanel.add(labelHour);  
            labelPanel.add(labelMin);  
            labelPanel.add(textHour);  
            labelPanel.add(textMin);  
            // 时分输入框添加按键监听，只允许输入数字  
            textHour.addKeyListener(this);  
            textMin.addKeyListener(this);  
               
            // 初始化按钮  
            btnOk = new JButton("确定");  
            btnCancel = new JButton("取消");  
            btnBack = new JButton("返回");  
            // 下面的按钮依次居中放进去  
            buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));  
            buttonPanel.add(btnBack);  
            buttonPanel.add(btnCancel);  
            buttonPanel.add(btnOk);  
            // 初始化主面板，将主面板分割为上下两部分  
            mainPanel = new JPanel(new BorderLayout());  
            mainPanel.add(labelPanel, BorderLayout.CENTER); // 上面显示时分的组件  
            mainPanel.add(buttonPanel, BorderLayout.SOUTH); // 下面排列三个按钮  
            setContentPane(mainPanel);  
            // 设置按钮监听  
            btnBack.addActionListener(this);  
            btnOk.addActionListener(this);  
            btnCancel.addActionListener(this);  
   
            cal.add(Calendar.HOUR, 1); // 默认设置为当前时间加1小时的整点时间  
            cal.set(Calendar.MINUTE, 0);  
            int hour = cal.get(Calendar.HOUR_OF_DAY);  
            int min = cal.get(Calendar.MINUTE);  
            textHour.setText(String.format("%02d", hour));  
            textMin.setText(String.format("%02d", min));  
            setLocationRelativeTo(frame);  
        }  
   
        public void keyPressed(KeyEvent arg0) {  
        }  
        public void keyReleased(KeyEvent arg0) {  
        }  
        public void keyTyped(KeyEvent e) {  
            int keyChar = e.getKeyChar();                   
            if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){  
            }else{ // 如果输入的不是数字则屏蔽输入  
                e.consume(); //关键，屏蔽掉非法输入    
            }   
        }  
   
        public void actionPerformed(ActionEvent e) {  
            Object source = e.getSource();  
            if(source == btnOk) { // 如果点击了确定按钮，则开始计时  
                int hour = 0, min = 0;  
                try {  
                    hour = Integer.parseInt(textHour.getText());  
                } catch (NumberFormatException e1) {  
                }  
                try {  
                    min = Integer.parseInt(textMin.getText());  
                } catch (NumberFormatException e1) {  
                }  
                startTimer(hour, min);  
                setVisible(false);  
            } else if(source == btnCancel) { // 点击取消按钮时取消计时  
                cancelTimer();  
                setVisible(false);  
            } else if(source == btnBack) { // 点击返回按钮时什么也不做，直接关闭设置界面  
                setVisible(false);  
            }  
        }  
    }  
}