playlist.java

mp3播放功能

package MP3;

/**
 *It imports two packages from the Package Function ,So
 *that it can put the songs to the list and delete them.
 *The other packages are from the Java System that support the appearance and the button events.
 *@see www.java.com
 *@version since 1.0
 *
 */
import java.awt.*;
import java.awt.event.*;
import java.io.*;

import java.util.HashMap;

import javax.swing.*;
import javax.swing.event.*;

import Function.SongString;
import Function.SongType;

import com.jgoodies.forms.factories.*;
import com.jgoodies.forms.layout.*;

/**
 * This class describes the playlist of Mp3 including the buttons,popupmenu and
 * a menu to chage the skill. It extends JFrame ,Created by JFormDesigner on Thu
 * Jul 10 21:35:01 CST 2008
 * 
 * @author ChenXiaoling
 * @author DuXiaojing
 */
public class Playlist extends JFrame {

	SpectrumTimeAnalyzer spectrum = new SpectrumTimeAnalyzer();

	/**
	 * Constructer of the class . Make the JFrame not hava the title bar. Set
	 * the size and make it unchangable Call the method initComponents() to init
	 * all the components.
	 * 
	 */
	public Playlist() {
		this.setUndecorated(true);
		initComponents();
		setSize(295, 271);
		setResizable(false);
	}

	/**
	 * When you press the Add button ,then invoke this method. Call the method
	 * to add the songs to the list.
	 * 
	 */
	private void AddActionPerformed() {
		// TODO add your code here
		addFileToList();
		LoadToFile();
	}

	/**
	 * Use a protected hashmap to save the song you want to put into the list
	 * SongString can save each song after invoke the method loadFiles() Each
	 * song can not be duplicated.
	 * 
	 * @see Function.SontString
	 * 
	 */
	protected void addFileToList() {
		SongString[] AllSongs = loadFiles();
		if (AllSongs != null) {
			for (int i = 0; i < AllSongs.length; i++) {
				if (!hashmap.containsKey(AllSongs[i].getName())) {
					hashmap.put(AllSongs[i].getName(), AllSongs[i]);
					Playlist.add(AllSongs[i].getName());
				}
			}
		}
	}

	/**
	 * This method is used to load the files from the computer itself.
	 * 
	 * @see JFileChooser
	 * @see SongString
	 * @return <code>the SongString array</code> if you choose some<code>null</code>
	 *         otherwise.
	 */
	protected SongString[] loadFiles() {
		JFileChooser chooser = new JFileChooser();
		chooser.setMultiSelectionEnabled(true);
		chooser.setFileFilter(new SongType());
		int returnVal = chooser.showOpenDialog(this);
		if (returnVal == JFileChooser.APPROVE_OPTION) {
			File[] selectedFiles = chooser.getSelectedFiles();
			SongString[] songNames = new SongString[selectedFiles.length];
			for (int i = 0; i < songNames.length; i++) {
				songNames[i] = new SongString(selectedFiles[i].getName(),
						selectedFiles[i].getAbsolutePath());
			}
			return songNames;
		} else {
			return null;
		}

	}

	/**
	 * When pressing the delete button ,invoke Call the method removeFile()
	 * 
	 */
	private void DeleteActionPerformed() {
		// TODO add your code here
		removeFile();
		LoadToFile();
	}

	/**
	 * Use the Hashmap object to remove the selected,and also remove it from the
	 * list
	 * 
	 * @see HashMap
	 */
	private void removeFile() {
		String[] selected = Playlist.getSelectedItems();
		for (int i = 0; i < selected.length; i++) {
			Playlist.remove(selected[i]);
			hashmap.remove(selected[i]);
		}
	}

	public void AddListActionPerformed() {
		String name = JOptionPane
				.showInputDialog("Input the name of the List:");
		if (name != null) {
			while(model.contains(name))
				name = JOptionPane
				.showInputDialog("Have one already,Input the name again:");
			   model.addElement(name);
			file = new File(name + ".dat");
			while(!file.exists())
				try {
					file.createNewFile();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
		}
		Playlist1.setSelectedIndex(model.getSize()-1);
	}

	public void DeleteListActionPerformed() {
		int n = Playlist1.getSelectedIndex();
		if(n==0)
			Playlist1.setSelectedIndex(1);
		else
			Playlist1.setSelectedIndex(0);
		model.remove(n);
		Playlist.removeAll();
	//	SwingUtilities.updateComponentTreeUI(this);
	}

	public void LoadToFile() {  //　加载对应列表的文件
		int count = Playlist.getItemCount();
		try {
			output = new ObjectOutputStream(new FileOutputStream(model.get(Playlist1.getSelectedIndex())
					+ ".dat"));
			String order;
			SongString song;
			for (int i = 0; i < count; i++) {
				order = Playlist.getItem(i);
				song = (SongString) hashmap.get(order);
				record = new Record(order, song.getPath());
				output.writeObject(record);
				output.flush();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public void Reload(String name) {
		// =============装载原有列表==================
		try {
			input = new ObjectInputStream(new FileInputStream(name + ".dat"));
			record = new Record();
			record = (Record) input.readObject();
			hashmap.clear();
			while (record != null) {
				hashmap.put(record.getName(), new SongString(record.getName(),
						record.getPath()));
				Playlist.add(record.getName());
				record = (Record) input.readObject();
			}
		} catch (EOFException end) {
			try {
				input.close();
			} catch (IOException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		} catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public void ListValueChanged() {
		Playlist.removeAll();
		String name = (String) model.get(Playlist1.getSelectedIndex());
		Reload(name);
	}

	/**
	 * Add all components into the playlist List object Playlist to show the
	 * songs ScrollPane object scrollPane1 to add to the Playlist Button object
	 * Add to add the songs Button object Delete to delete the song you selected
	 * JMenu object Skin including JMenuItem object
	 * Green,Challenger,RavenGra,Raven,Autumn to change the skin of the MP3
	 * PopupMenu object popup to add to the Playlist Add the listeners to each
	 * components
	 * 
	 * Use FormLayout to layout all the components.
	 * 
	 * @see FormLayout
	 * @author ChenXiaoling
	 * @author DuXiaojing
	 */
	private void initComponents() {
		// JFormDesigner - Component initialization - DO NOT MODIFY
		// //GEN-BEGIN:initComponents
		// Generated using JFormDesigner non-commercial license
		// vector = new Vector();
		model = new DefaultListModel();
		scrollPane1 = new ScrollPane();
		Playlist1 = new JList(model);
		scrollPane2 = new JScrollPane();
		Playlist = new List();
		panel2 = new JPanel();
		panel1 = new JPanel();
		Add = new JButton();
		Delete = new JButton();
		AddList = new JButton();
		DeleteList = new JButton();
		Skin = new JMenu("Skin");
		Green = new JRadioButtonMenuItem("Default");
		Challenger = new JRadioButtonMenuItem("ChallengerDeep");
		RavenGra = new JRadioButtonMenuItem("RavenGraphite");
		Raven = new JRadioButtonMenuItem("Raven");
		Autumn = new JRadioButtonMenuItem("Autumn");
		bar = new JMenuBar();
		panel = new JPanel();

		hashmap = new HashMap();
		popup = new PopupMenu();
		popup1 = new PopupMenu();

		CellConstraints cc = new CellConstraints();

		// =========popup=============
		String list[] = { "Add songs", "Delete songs" };
		MenuItem add = new MenuItem(list[0]);
		MenuItem delete = new MenuItem(list[1]);
		popup.add(add);
		popup.add(delete);
		add.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				AddActionPerformed();
			}
		});
		delete.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				DeleteActionPerformed();
			}
		});
		Playlist.addMouseListener(new MouseAdapter() {
			public void mousePressed(MouseEvent e) {
				check(e);
			}

			public void mouseReleased(MouseEvent e) {
				check(e);
			}

			private void check(MouseEvent e) {