audio.java

simple applet 应用

/*
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 * and open the template in the editor.
 */

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.applet.Applet.*;
import java.applet.AudioClip;

/**
 *
 * @author Administrator
 */
public class Audio extends JApplet implements ActionListener, ItemListener{
    private JFrame f;
    private FileDialog fd;
    private AudioClip audioFile;
    private JButton play,loop,stop,select;
    private List list;
    private JPanel p1,p2,p3;
    private boolean looping =false ;
    @Override
    public void  init(){
        list = new List(5,false);   
        list.addItemListener(this);
        play = new JButton("Play");
        play.addActionListener(this);
        loop = new JButton("Loop");
        loop.addActionListener(this);
        stop = new JButton("Stop");
        stop.addActionListener(this);
        select = new JButton("Select file");
        select.addActionListener(this);
        p1 = new JPanel();
        p2 = new JPanel();
        p3 = new JPanel();
        p1.setLayout(new BorderLayout());
        p2.setLayout(new FlowLayout()); 
        p3.setLayout(new BorderLayout());
        p2.add(play);
        p2.add(loop);
        p2.add(stop);
        p3.add(select,"North");
        p1.add(list,"North");
        p1.add(p2,"Center");
        p1.add(p3,"West");
        
        this.setContentPane(p1);
    }
    @Override
    public void start(){
        if(audioFile!=null){
            audioFile.play();
        }
        if(looping)
        {
            audioFile.loop();
        }
    }
    @Override
    public void stop(){
        if(audioFile!=null)
        {
            audioFile.stop();
        }
        if(looping)
        {
            audioFile.stop();
        }
    }
    public void actionPerformed(ActionEvent e) {
        Object source = e.getSource();
        if(source==play){
            if(audioFile!=null)
            {
                start();
                loop.setEnabled(true);
                play.setEnabled(false);
                stop.setEnabled(true);
            }
        }
        if(source==loop){
            if(audioFile!=null){
                looping = true;
                start();
                play.setEnabled(false);
                loop.setEnabled(false);
                stop.setEnabled(true);
            }
        }
        if(source==stop){
            if(audioFile!=null)
            {
                stop();
                stop.setEnabled(false);
                play.setEnabled(true);
                loop.setEnabled(true);
            }
        }
        if(source==select){
            f = new JFrame();
            fd =new FileDialog(f,"Openfile",FileDialog.LOAD);
            fd.setVisible(true); 
            String s = new String(fd.getFile());
            list.add(s);
        }
    }
    public void itemStateChanged(ItemEvent e) {
        String s = new String(list.getSelectedItem());
				audioFile = getAudioClip(getDocumentBase(),s);
    }
}