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显示如上图所示的动态时钟，并且可以设置闹钟，播放mp3。
首先用到的是时钟（Timer）和日历（Calendar）得到系统的当前时间。
代码如下：
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Timer;
import java.util.TimerTask;
import javax.media.CannotRealizeException;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.NoPlayerException;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javazoom.jl.player.Player;
public class Clock extends JFrame {
MyPanel clockPanel;
Ellipse2D.Double e;
int x;
int y;
Line2D.Double hourLine;
Line2D.Double minLine;
Line2D.Double secondLine;
GregorianCalendar calendar;
int hour;
int minute;
int second;
String timestr = "";
static int sethour;
static int setminute;
static int setsecond;
public static final int X = 60;
public static final int Y = 60;
public static final int X_BEGIN = 10;
public static final int Y_BEGIN = 10;
public static final int RADIAN = 50;
public Clock(){
setSize(300, 200);
setTitle("动态时钟");
clockPanel = new MyPanel();
add(clockPanel);
Timer t = new Timer();
Task task = new Task();
t.schedule(task, 0, 1000);//每秒刷新一次
}
File file = new File("当我想你的时候.mp3");
public static void playMusic(File file) { //显示mp3文件的绝对路径
try {
javax.media.Player player = null;
if (file.exists()) {
MediaLocator locator = new MediaLocator("file:"
+ file.getAbsolutePath());
System.out.println(file.getAbsolutePath());
player = Manager.createRealizedPlayer(locator);
player.prefetch();// Ԥ准备读取
player.start();// 开始读取
} else {
System.out.println("没找到文件");
}
} catch (CannotRealizeException ex) {
ex.printStackTrace();
} catch (NoPlayerException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
}
public void play() {//播放mp3文件
try {
BufferedInputStream buffer = new BufferedInputStream(new FileInputStream("当我想你的时候.mp3"));
Player player = new Player(buffer);
player.play();
} catch (Exception e) {
System.out.println(e);
}
}
public static void main(String[] args) {
Clock t = new Clock();
t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
t.setVisible(true);
//t.setLocationRelativeTo(null);//窗体显示在屏幕中央
//输入要设置的闹钟时间
sethour = Integer.parseInt(JOptionPane.showInputDialog("请输入小时："));
setminute = Integer.parseInt(JOptionPane.showInputDialog("请输入分钟："));
setsecond = Integer.parseInt(JOptionPane.showInputDialog("请输入秒："));
}
class MyPanel extends JPanel {
public MyPanel() {
e = new Ellipse2D.Double(X_BEGIN, Y_BEGIN, 100, 100);
hourLine = new Line2D.Double(X, Y, X, Y);
minLine = new Line2D.Double(X, Y, X, Y);
secondLine = new Line2D.Double(X, Y, X, Y);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.drawString("12", 55, 25);//整点时间
g2.drawString("6", 55, 105);
g2.drawString("9", 15, 65);
g2.drawString("3", 100, 65);
g2.drawString(timestr, 0, 130);
g2.draw(e);
g2.draw(hourLine);//时针
g2.draw(minLine);//分针
g2.draw(secondLine);//秒针
}
}
class Task extends TimerTask {
public void run() {
calendar = new GregorianCalendar();
hour = calendar.get(Calendar.HOUR);
minute = calendar.get(Calendar.MINUTE);
second = calendar.get(Calendar.SECOND);
if(sethour == hour && setminute == minute && setsecond == second){
playMusic(file);
play();
}
timestr = "当前时间：" + hour + " : " + minute + " : " + second;
hourLine.x2 = X + 40 * Math.cos(hour * (Math.PI / 6) - Math.PI / 2);
hourLine.y2 = Y + 40 * Math.sin(hour * (Math.PI / 6) - Math.PI / 2);
minLine.x2 = X + 45
* Math.cos(minute * (Math.PI / 30) - Math.PI / 2);
minLine.y2 = Y + 45
* Math.sin(minute * (Math.PI / 30) - Math.PI / 2);
secondLine.x2 = X + 50
* Math.cos(second * (Math.PI / 30) - Math.PI / 2);
secondLine.y2 = Y + 50
* Math.sin(second * (Math.PI / 30) - Math.PI / 2);
repaint();
}
}
}其中播放mp3文件需要下载对应的jar包，否则不能播放。
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