[求助]用java制作一播放MP3播放的程序
用java制作一播放MP3播放的程序，經過研究已經達到播放的要求，但重點是太卡了，且CPU占用太滿了，直接超100%.不知道是不是線程的問題，請高手予以幫助，不勝感激。
import javax.media.*;
import javax.media.bean.playerbean.*;
import javax.swing.UIManager;
import java.awt.*;
import java.awt.event.*;
class MediaPlayer extends Frame implements ActionListener, ControllerListener,
ItemListener {
private static final long serialVersionUID = 1L;
Player player;
Component vc, cc;
boolean first = true, loop = false;
String currentDirectory;
MediaPlayer(String title)
{
//构造函数
super(title);
addWindowListener
(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
// 用户点击窗口系统菜单的关闭按钮
// 调用dispose以执行windowClosed
dispose();
}
public void windowClosed(WindowEvent e)
{
if (player != null)
player.close();
System.exit(0);
}
});
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
Menu m = new Menu("文件");
MenuItem mi = new MenuItem("打开");
mi.addActionListener(this);
m.add(mi);
m.addSeparator();
CheckboxMenuItem cbmi = new CheckboxMenuItem("循环", false);
cbmi.addItemListener(this);
m.add(cbmi);
m.addSeparator();
mi = new MenuItem("退出");
mi.addActionListener(this);
m.add(mi);
MenuBar mb = new MenuBar();
mb.add(m);
setMenuBar(mb);
setSize(200, 200);
setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
if (e.getActionCommand().equals("退出"))
{
// 调用dispose以便执行windowClosed
dispose();
return;
}
FileDialog fd = new FileDialog(this, "打开媒体文件",FileDialog.LOAD);
fd.setDirectory(currentDirectory);
fd.show();
// 如果用户放弃选择文件，则返回
if (fd.getFile() == null)
return;
currentDirectory = fd.getDirectory();
if (player != null)
player.close();
try
{
player = Manager.createPlayer(new MediaLocator
("file:" + fd.getDirectory() + fd.getFile()));
}
catch (java.io.IOException e2)
{
System.out.println(e2);
return;
}
catch (NoPlayerException e2)
{
System.out.println("不能找到播放器.");
return;
}
if (player == null)
{
System.out.println("无法创建播放器.");
return;
}
first = false;
setTitle(fd.getFile());
player.addControllerListener(this);
player.prefetch();
}
public void controllerUpdate(ControllerEvent e)
{
// 调用player.close()时ControllerClosedEvent事件出现。
// 如果存在视觉部件，则该部件应该拆除（为一致起见，
// 我们对控制面板部件也执行同样的操作）
if (e instanceof ControllerClosedEvent)
{
if (vc != null)
{
remove(vc);
vc = null;
}
if (cc != null)
{
remove(cc);
cc = null;
}
return;
}
if (e instanceof EndOfMediaEvent)
{
if (loop)
{
player.setMediaTime(new Time(0));
player.start();
}
return;
}
if (e instanceof PrefetchCompleteEvent)
{
player.start();
return;
}
if (e instanceof RealizeCompleteEvent)
{
vc = player.getVisualComponent();
if (vc != null)
add(vc);
cc = player.getControlPanelComponent();
if (cc != null)
add(cc, BorderLayout.SOUTH);
pack();
}
}
public void itemStateChanged(ItemEvent e)
{
loop = !loop;
}
public void paint(Graphics g)
{
if (first)
{
int w = getSize().width;
int h = getSize().height;
g.setColor(Color.blue);
g.fillRect(0, 0, w, h);
Font f = new Font("DialogInput", Font.BOLD, 16);
g.setFont(f);
FontMetrics fm = g.getFontMetrics();
int swidth = fm.stringWidth("*** 欢迎 ***");
g.setColor(Color.white);
g.drawString("*** 欢迎 ***",
(w - swidth) / 2,
(h + getInsets().top) / 2);
}
// 调用超类Frame的paint()方法，该paint()方法将调用Frame包含的各个容器
// 和部件（包括控制面板部件）的paint()方法。
super.paint(g);
}
// 不执行背景清除操作，以免控制面板部件闪烁
public void update(Graphics g)
{
paint(g);
}
public static void main(String[] args) {
new MediaPlayer("媒体播放器1.0");
}
}
