存贮beatbox
云德辉
import java.awt.*;
import javax.swing.*;
import javax.sound.midi.*;
import java.util.*;
import java.awt.event.*;
import java.io.*;
public class BeatBox
{
JPanel mainPanel;
ArrayList<JCheckBox> checkboxList;//把checkbox存贮在ArrayList中
Sequencer sequencer;
Sequence sequence;
Track track;
JFrame theFrame;
//乐器的名称，以String的array维护
String [] instrumentNames={"Bass Drum","Closed Hi-Hat","Open Hi-Hat","Acoustic Snare","Crash Cymbal","Hand Clap","High Tom","Hi Bongo","Maracas","Whistle","Low Conga","Cowbell","Vibraslap","Low-mid Tom","High Agogo","Open Hi Conga"};
//实际的乐器关键字，例如说35是bass，42是Closed Hi-Hat
int [] instruments={35,42,46,38,49,39,50,60,70,72,64,56,58,47,67,63};
public static void main(String [] args)
{
new BeatBox().buildGUI();
}
public void buildGUI()
{
theFrame=new JFrame("Cyber BeatBox");
theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
BorderLayout layout=new BorderLayout();
JPanel background=new JPanel(layout);
background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));//设定面板上摆设组件时的空白边缘
checkboxList=new ArrayList<JCheckBox>();
Box buttonBox=new Box(BoxLayout.Y_AXIS);
JButton start=new JButton("Start");
start.addActionListener(new MyStartListener());
buttonBox.add(start);
JButton stop=new JButton("stop");
stop.addActionListener(new MyStopListener());
buttonBox.add(stop);
JButton upTempo=new JButton("Tempo Up");
upTempo.addActionListener(new MyUpTempoListener());
buttonBox.add(upTempo);
JButton downTempo=new JButton("Tempo Down");
downTempo.addActionListener(new MyDownTempoListener());
buttonBox.add(downTempo);
JButton serializeltButton=new JButton("serializelt");
serializeltButton.addActionListener(new MySendListener());
buttonBox.add(serializeltButton);
JButton restoreButton=new JButton("restore");
restoreButton.addActionListener(new MyReadInListener());
buttonBox.add(restoreButton);
Box nameBox=new Box(BoxLayout.Y_AXIS);
for(int i=0;i<16;i++)
nameBox.add(new Label(instrumentNames[i]));
background.add(BorderLayout.EAST,buttonBox);
background.add(BorderLayout.WEST,nameBox);
theFrame.getContentPane().add(background);
GridLayout grid=new GridLayout(16,16);
grid.setVgap(1);
grid.setHgap(2);
mainPanel=new JPanel(grid);
background.add(BorderLayout.CENTER,mainPanel);
//创建checkbox组，设定为未勾选的为false并加到ArrayList和面板上
for(int i=0;i<256;i++)
{
JCheckBox c=new JCheckBox();
c.setSelected(false);
checkboxList.add(c);
mainPanel.add(c);
}
setUpMidi();
theFrame.setBounds(50,50,300,300);
theFrame.pack();
theFrame.setVisible(true);
}
public void setUpMidi()
{
try{
sequencer=MidiSystem.getSequencer();
sequencer.open();
sequence=new Sequence(Sequence.PPQ,4);
track=sequence.createTrack();
sequencer.setTempoInBPM(120);
}catch(Exception e){e.printStackTrace();}
}
//重在这里，此处会将复选框状态转化为MIDI事件并加到track上
public void buildTrackAndStart()
{
int [] trackList=null;//创建出16个元素的数组来存贮一项乐器的值。如果该节奏应该要演奏，其值会是关键字值，否则值为0
sequence.deleteTrack(track);//除掉旧的track做一个新的
track=sequence.createTrack();
for(int i=0;i<16;i++)//对每个乐器执行一次
{
trackList=new int[16];
int key=instruments[i];//设定乐器的关键词
for(int j=0;j<16;j++)//对每节拍执行一次
{
JCheckBox jc=(JCheckBox)checkboxList.get(j+(16*i));
if(jc.isSelected())//如果有勾选，将关键字值放在数组的该位置上，不然的话就补零
trackList[j]=key;
else
trackList[j]=0;
}
makeTracks(trackList);//创建此乐器的事件并加到track上
track.add(makeEvent(176,1,127,0,16));//创建次乐器的事件并加到track上
}
track.add(makeEvent(192,9,1,0,15));//确保第16拍有事件，都则beatbox不会重复播放
try
{
sequencer.setSequence(sequence);
sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);//指定无穷的播放次数
sequencer.start();
sequencer.setTempoInBPM(120);
}catch(Exception e){e.printStackTrace();}
}
public class MySendListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
boolean [] checkboxState=new boolean[256];
for(int i=0;i<256;i++)
{
JCheckBox check=(JCheckBox)checkboxList.get(i);
if(check.isSelected())
checkboxState[i]=true;
}
try{
JFileChooser fileOpen=new JFileChooser();
fileOpen.showOpenDialog(theFrame);
FileOutputStream fileStream=new FileOutputStream(fileOpen.getSelectedFile());
ObjectOutputStream os=new ObjectOutputStream(fileStream);
os.writeObject(checkboxState);
}catch(Exception ex)
{
ex.printStackTrace();
}
}
}
public class MyReadInListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
boolean[] checkboxState=null;
try{
JFileChooser fileOpen=new JFileChooser();
fileOpen.showOpenDialog(theFrame);
FileInputStream fileIn=new FileInputStream(fileOpen.getSelectedFile());
ObjectInputStream is=new ObjectInputStream(fileIn);
checkboxState=(boolean[])is.readObject();
}catch(Exception ex){ex.printStackTrace();}
for(int i=0;i<256;i++)
{
JCheckBox check=(JCheckBox)checkboxList.get(i);
if(checkboxState[i])
{
check.setSelected(true);
}else
check.setSelected(false);
}
sequencer.stop();
buildTrackAndStart();
}
}
public class MyStartListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
buildTrackAndStart();
}
}
public class MyStopListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
sequencer.stop();
}
}
public class MyUpTempoListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
float tempoFactor=sequencer.getTempoFactor();//节奏因子预设为1.0，每次调整3%
sequencer.setTempoFactor((float)(tempoFactor*1.03));
}
}
public class MyDownTempoListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
float tempoFactor=sequencer.getTempoFactor();
sequencer.setTempoFactor((float)(tempoFactor*0.97));
}
}
//创建某项乐器的所有事件
public void makeTracks(int [] list)
{
for(int i=0;i<16;i++)
{
int key=list[i];
if(key!=0)
{
//创建NOTE ON和NOTE OFF事件并加入到track上
track.add(makeEvent(144,9,key,100,i));
track.add(makeEvent(128,9,key,100,i+1));
}
}
}
public MidiEvent makeEvent(int comd,int chan,int one,int two,int tick)
{
MidiEvent event=null;
try
{
ShortMessage a=new ShortMessage();
a.setMessage(comd,chan,one,two);
event=new MidiEvent(a,tick);
}catch(Exception e)
{e.printStackTrace();}
return event;
}
}
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