一个简单的Java音乐播放器

package KKMusic;
 import java.applet.Applet;
 import java.applet.AudioClip;
 import java.awt.BorderLayout;
 import java.awt.EventQueue;
 import javax.swing.JFrame;
 import javax.swing.JPanel;
 import javax.swing.border.EmptyBorder;
 import java.awt.CardLayout;
 import javax.swing.JButton;
 import javax.swing.JFileChooser;
 import javax.sound.sampled.FloatControl;
 import javax.sound.sampled.SourceDataLine;
 import javax.swing.GroupLayout;
 import javax.swing.GroupLayout.Alignment;
 import java.awt.event.ActionListener;
 import java.awt.event.ActionEvent;
 import javax.swing.LayoutStyle.ComponentPlacement;
 import javax.swing.JMenuBar;
 import javax.swing.JMenuItem;
 import java.awt.event.ItemListener;
 import java.io.File;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.awt.event.ItemEvent;
 import javax.swing.JMenu;
 import javax.swing.JTextField;
 import javax.swing.SwingConstants;
 import javax.swing.JSlider;
 import java.awt.event.MouseMotionAdapter;
 import java.awt.event.MouseEvent;
public class Mp3 extends JFrame {
private JPanel contentPane;
 File file;//声明文件对象
 String filename;
 JFileChooser chooser=new JFileChooser();//创建一个文件选择器
 private JTextField xiaoxi;
 boolean loop=false;
 AudioClip adc;//声音音频剪辑对象
 SourceDataLine line;
 private FloatControl volume = null;
 /**
 * Launch the application.
 */
 public static void main(String[] args) {
 EventQueue.invokeLater(new Runnable() {
 public void run() {
 try {
 Mp3 frame = new Mp3();
 frame.setVisible(true);
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 });
 }
/**
 * Create the frame.
 */
 public Mp3() {
 setTitle("\u97F3\u4E50\u64AD\u653E\u5668");
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 setBounds(100, 100, 265, 333);
JMenuBar menuBar = new JMenuBar();
 setJMenuBar(menuBar);
JMenu mnNewMenu = new JMenu("\u6587\u4EF6");
 menuBar.add(mnNewMenu);
 xiaoxi = new JTextField();
 xiaoxi.setColumns(10);
 xiaoxi.setText("欢迎使用本播放器");
 JMenuItem dakai = new JMenuItem("\u6253\u5F00");
 dakai.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 int value=chooser.showOpenDialog(chooser);//接受文件选择器的状态
 if(value==chooser.APPROVE_OPTION){
 file=chooser.getSelectedFile();//返回选中文件
 filename=file.getName();
 String flag=filename;
 xiaoxi.setText(flag);
 try {
 if(adc!=null)
 adc.stop();
 URL url=new URL("file:"+file.getPath());//创建资源定位
 adc=Applet.newAudioClip(url);
 //adc.play();
} catch (MalformedURLException e1) {
 // TODO Auto-generated catch block
 e1.printStackTrace();
 System.out.println("不能播放！");
 }
 }
 }
 });
 mnNewMenu.add(dakai);
JMenuItem tuichu = new JMenuItem("\u9000\u51FA");
 tuichu.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 dispose();
 if(adc!=null)
 adc.stop();
 return ;
 }
 });
mnNewMenu.add(tuichu);
 contentPane = new JPanel();
 contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
 setContentPane(contentPane);
JButton playbtn = new JButton("\u64AD\u653E");
 playbtn.setHorizontalAlignment(SwingConstants.LEFT);
 playbtn.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 String flag="正在播放："+filename;
 if(adc==null){
 flag="请选择播放的音乐";
 xiaoxi.setText(flag);
 return;
 }
 adc.play();
 xiaoxi.setText(flag);
 }
 });
JButton stopbtn = new JButton("\u6682\u505C");
 stopbtn.setHorizontalAlignment(SwingConstants.LEFT);
 stopbtn.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 adc.stop();
 String flag="停止播放音乐:"+filename;
 xiaoxi.setText(flag);
 }
 });
JButton againbtn = new JButton("\u5FAA\u73AF");
 againbtn.setHorizontalAlignment(SwingConstants.LEFT);
 againbtn.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 loop =!loop;
 String flag="";
 ; if(loop){
 adc.play();
 adc.loop();//循环播放
 flag="循环播放:"+filename;
 }
  else{
  adc.play();
  flag="顺序播放"+filename;
  }
  xiaoxi.setText(flag);
 }
 });
GroupLayout gl_contentPane = new GroupLayout(contentPane);
 gl_contentPane.setHorizontalGroup(
 gl_contentPane.createParallelGroup(Alignment.LEADING)
 .addGroup(gl_contentPane.createSequentialGroup()
 .addContainerGap()
 .addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING, false)
 .addComponent(xiaoxi, Alignment.LEADING)
 .addGroup(Alignment.LEADING, gl_contentPane.createSequentialGroup()
 .addComponent(playbtn, GroupLayout.PREFERRED_SIZE, 64, GroupLayout.PREFERRED_SIZE)
 .addPreferredGap(ComponentPlacement.UNRELATED)
 .addComponent(stopbtn, GroupLayout.PREFERRED_SIZE, 66, GroupLayout.PREFERRED_SIZE)
 .addPreferredGap(ComponentPlacement.UNRELATED)
 .addComponent(againbtn, GroupLayout.PREFERRED_SIZE, 64, GroupLayout.PREFERRED_SIZE)))
 .addContainerGap(15, Short.MAX_VALUE))
 );
 gl_contentPane.setVerticalGroup(
 gl_contentPane.createParallelGroup(Alignment.TRAILING)
 .addGroup(gl_contentPane.createSequentialGroup()
 .addComponent(xiaoxi, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
 .addPreferredGap(ComponentPlacement.UNRELATED)
 .addPreferredGap(ComponentPlacement.RELATED, 173, Short.MAX_VALUE)
 .addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
 .addComponent(playbtn)
 .addComponent(stopbtn)
 .addComponent(againbtn))
 .addContainerGap())
 );
 contentPane.setLayout(gl_contentPane);
 }
}