本文实例为大家分享了java实现动态时钟设置闹钟功能，供大家参考，具体内容如下
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。
下载地址：java实现动态时钟
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