Java swing实现支持录音等功能的钢琴程序
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2023-12-21 10:11:31
今天给大家介绍一下java实现钢琴的小程序，程序虽小，功能挺多，支持循环播放，录音等功能，首先简单介绍下源码结构：
先看看钢琴界面实现，添加相应滴监听事件：...
今天给大家介绍一下java实现钢琴的小程序，程序虽小，功能挺多，支持循环播放，录音等功能，首先简单介绍下源码结构：
先看看钢琴界面实现，添加相应滴监听事件：
/*
* @(#)midisynth.java 1.15 99/12/03
*
* copyright (c) 1999 sun microsystems, inc. all rights reserved.
*
* sun grants you ("licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) licensee does not utilize the software in a manner
* which is disparaging to sun.
*
* this software is provided "as is," without a warranty of any kind. all
* express or implied conditions, representations and warranties, including any
* implied warranty of merchantability, fitness for a particular purpose or
* non-infringement, are hereby excluded. sun and its licensors shall not be
* liable for any damages suffered by licensee as a result of using, modifying
* or distributing the software or its derivatives. in no event will sun or its
* licensors be liable for any lost revenue, profit or data, or for direct,
* indirect, special, consequential, incidental or punitive damages, however
* caused and regardless of the theory of liability, arising out of the use of
* or inability to use software, even if sun has been advised of the
* possibility of such damages.
*
* this software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. licensee represents and warrants that it will not use or
* redistribute the software for such purposes.
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import javax.swing.event.*;
import javax.sound.midi.*;
import java.util.vector;
import java.io.file;
import java.io.ioexception;
/**
* illustrates general midi melody instruments and midi controllers.
*
* @version @(#)midisynth.java 1.15 99/12/03
* @author brian lichtenwalter
*/
public class midisynth extends jpanel implements controlcontext {
final int program = 192;
final int noteon = 144;
final int noteoff = 128;
final int sustain = 64;
final int reverb = 91;
final int on = 0, off = 1;
final color jfcblue = new color(204, 204, 255);
final color pink = new color(255, 175, 175);
sequencer sequencer;
sequence sequence;
synthesizer synthesizer;
instrument instruments[];
channeldata channels[];
channeldata cc; // current channel
jcheckbox mouseovercb = new jcheckbox("mouseover", true);
jslider velos, press, bends, revbs;
jcheckbox solocb, monocb, mutecb, sustcb;
vector keys = new vector();
vector whitekeys = new vector();
jtable table;
piano piano;
boolean record;
track track;
long starttime;
recordframe recordframe;
controls controls;
public midisynth() {
setlayout(new borderlayout());
jpanel p = new jpanel();
p.setlayout(new boxlayout(p, boxlayout.y_axis));
emptyborder eb = new emptyborder(5,5,5,5);
bevelborder bb = new bevelborder(bevelborder.lowered);
compoundborder cb = new compoundborder(eb,bb);
p.setborder(new compoundborder(cb,eb));
jpanel pp = new jpanel(new borderlayout());
pp.setborder(new emptyborder(10,20,10,5));
pp.add(piano = new piano());
p.add(pp);
p.add(controls = new controls());
p.add(new instrumentstable());
add(p);
}
public void open() {
try {
if (synthesizer == null) {
if ((synthesizer = midisystem.getsynthesizer()) == null) {
system.out.println("getsynthesizer() failed!");
return;
}
}
synthesizer.open();
sequencer = midisystem.getsequencer();
sequence = new sequence(sequence.ppq, 10);
} catch (exception ex) { ex.printstacktrace(); return; }
soundbank sb = synthesizer.getdefaultsoundbank();
if (sb != null) {
instruments = synthesizer.getdefaultsoundbank().getinstruments();
synthesizer.loadinstrument(instruments[0]);
}
midichannel midichannels[] = synthesizer.getchannels();
channels = new channeldata[midichannels.length];
for (int i = 0; i < channels.length; i++) {
channels[i] = new channeldata(midichannels[i], i);
}
cc = channels[0];
listselectionmodel lsm = table.getselectionmodel();
lsm.setselectioninterval(0,0);
lsm = table.getcolumnmodel().getselectionmodel();
lsm.setselectioninterval(0,0);
}
public void close() {
if (synthesizer != null) {
synthesizer.close();
}
if (sequencer != null) {
sequencer.close();
}
sequencer = null;
synthesizer = null;
instruments = null;
channels = null;
if (recordframe != null) {
recordframe.dispose();
recordframe = null;
}
}
/**
* given 120 bpm:
* (120 bpm) / (60 seconds per minute) = 2 beats per second
* 2 / 1000 beats per millisecond
* (2 * resolution) ticks per second
* (2 * resolution)/1000 ticks per millisecond, or
* (resolution / 500) ticks per millisecond
* ticks = milliseconds * resolution / 500
*/
public void createshortevent(int type, int num) {
shortmessage message = new shortmessage();
try {
long millis = system.currenttimemillis() - starttime;
long tick = millis * sequence.getresolution() / 500;
message.setmessage(type+cc.num, num, cc.velocity);
midievent event = new midievent(message, tick);
track.add(event);
} catch (exception ex) { ex.printstacktrace(); }
}
/**
* black and white keys or notes on the piano.
*/
class key extends rectangle {
int notestate = off;
int knum;
public key(int x, int y, int width, int height, int num) {
super(x, y, width, height);
knum = num;
}
public boolean isnoteon() {
return notestate == on;
}
public void on() {
setnotestate(on);
cc.channel.noteon(knum, cc.velocity);
if (record) {
createshortevent(noteon, knum);
}
}
public void off() {
setnotestate(off);
cc.channel.noteoff(knum, cc.velocity);
if (record) {
createshortevent(noteoff, knum);
}
}
public void setnotestate(int state) {
notestate = state;
}
} // end class key
/**
* piano renders black & white keys and plays the notes for a midi
* channel.
*/
class piano extends jpanel implements mouselistener {
vector blackkeys = new vector();
key prevkey;
final int kw = 16, kh = 80;
public piano() {
setlayout(new borderlayout());
setpreferredsize(new dimension(42*kw, kh+1));
int transpose = 24;
int whiteids[] = { 0, 2, 4, 5, 7, 9, 11 };
for (int i = 0, x = 0; i < 6; i++) {
for (int j = 0; j < 7; j++, x += kw) {
int keynum = i * 12 + whiteids[j] + transpose;
whitekeys.add(new key(x, 0, kw, kh, keynum));
}
}
for (int i = 0, x = 0; i < 6; i++, x += kw) {
int keynum = i * 12 + transpose;
blackkeys.add(new key((x += kw)-4, 0, kw/2, kh/2, keynum+1));
blackkeys.add(new key((x += kw)-4, 0, kw/2, kh/2, keynum+3));
x += kw;
blackkeys.add(new key((x += kw)-4, 0, kw/2, kh/2, keynum+6));
blackkeys.add(new key((x += kw)-4, 0, kw/2, kh/2, keynum+8));
blackkeys.add(new key((x += kw)-4, 0, kw/2, kh/2, keynum+10));
}
keys.addall(blackkeys);
keys.addall(whitekeys);
addmousemotionlistener(new mousemotionadapter() {
public void mousemoved(mouseevent e) {
if (mouseovercb.isselected()) {
key key = getkey(e.getpoint());
if (prevkey != null && prevkey != key) {
prevkey.off();
}
if (key != null && prevkey != key) {
key.on();
}
prevkey = key;
repaint();
}
}
});
addmouselistener(this);
}
public void mousepressed(mouseevent e) {
prevkey = getkey(e.getpoint());
if (prevkey != null) {
prevkey.on();
repaint();
}
}
public void mousereleased(mouseevent e) {
if (prevkey != null) {
prevkey.off();
repaint();
}
}
public void mouseexited(mouseevent e) {
if (prevkey != null) {
prevkey.off();
repaint();
prevkey = null;
}
}
public void mouseclicked(mouseevent e) { }
public void mouseentered(mouseevent e) { }
public key getkey(point point) {
for (int i = 0; i < keys.size(); i++) {
if (((key) keys.get(i)).contains(point)) {
return (key) keys.get(i);
}
}
return null;
}
public void paint(graphics g) {
graphics2d g2 = (graphics2d) g;
dimension d = getsize();
g2.setbackground(getbackground());
g2.clearrect(0, 0, d.width, d.height);
g2.setcolor(color.white);
g2.fillrect(0, 0, 42*kw, kh);
for (int i = 0; i < whitekeys.size(); i++) {
key key = (key) whitekeys.get(i);
if (key.isnoteon()) {
g2.setcolor(record ? pink : jfcblue);
g2.fill(key);
}
g2.setcolor(color.black);
g2.draw(key);
}
for (int i = 0; i < blackkeys.size(); i++) {
key key = (key) blackkeys.get(i);
if (key.isnoteon()) {
g2.setcolor(record ? pink : jfcblue);
g2.fill(key);
g2.setcolor(color.black);
g2.draw(key);
} else {
g2.setcolor(color.black);
g2.fill(key);
}
}
}
} // end class piano
/**
* stores midichannel information.
*/
class channeldata {
midichannel channel;
boolean solo, mono, mute, sustain;
int velocity, pressure, bend, reverb;
int row, col, num;
public channeldata(midichannel channel, int num) {
this.channel = channel;
this.num = num;
velocity = pressure = bend = reverb = 64;
}
public void setcomponentstates() {
table.setrowselectioninterval(row, row);
table.setcolumnselectioninterval(col, col);
solocb.setselected(solo);
monocb.setselected(mono);
mutecb.setselected(mute);
//sustcb.setselected(sustain);
jslider slider[] = { velos, press, bends, revbs };
int v[] = { velocity, pressure, bend, reverb };
for (int i = 0; i < slider.length; i++) {
titledborder tb = (titledborder) slider[i].getborder();
string s = tb.gettitle();
tb.settitle(s.substring(0, s.indexof('=')+1)+s.valueof(v[i]));
slider[i].repaint();
}
}
} // end class channeldata
/**
* table for 128 general midi melody instuments.
*/
class instrumentstable extends jpanel {
private string names[] = {
"piano", "chromatic perc.", "organ", "guitar",
"bass", "strings", "ensemble", "brass",
"reed", "pipe", "synth lead", "synth pad",
"synth effects", "ethnic", "percussive", "sound effects" };
private int nrows = 8;
private int ncols = names.length; // just show 128 instruments
public instrumentstable() {
setlayout(new borderlayout());
tablemodel datamodel = new abstracttablemodel() {
public int getcolumncount() { return ncols; }
public int getrowcount() { return nrows;}
public object getvalueat(int r, int c) {
if (instruments != null) {
return instruments[c*nrows+r].getname();
} else {
return integer.tostring(c*nrows+r);
}
}
public string getcolumnname(int c) {
return names[c];
}
public class getcolumnclass(int c) {
return getvalueat(0, c).getclass();
}
public boolean iscelleditable(int r, int c) {return false;}
public void setvalueat(object obj, int r, int c) {}
};
table = new jtable(datamodel);
table.setselectionmode(listselectionmodel.single_selection);
// listener for row changes
listselectionmodel lsm = table.getselectionmodel();
lsm.addlistselectionlistener(new listselectionlistener() {
public void valuechanged(listselectionevent e) {
listselectionmodel sm = (listselectionmodel) e.getsource();
if (!sm.isselectionempty()) {
cc.row = sm.getminselectionindex();
}
programchange(cc.col*nrows+cc.row);
}
});
// listener for column changes
lsm = table.getcolumnmodel().getselectionmodel();
lsm.addlistselectionlistener(new listselectionlistener() {
public void valuechanged(listselectionevent e) {
listselectionmodel sm = (listselectionmodel) e.getsource();
if (!sm.isselectionempty()) {
cc.col = sm.getminselectionindex();
}
programchange(cc.col*nrows+cc.row);
}
});
table.setpreferredscrollableviewportsize(new dimension(ncols*110, 200));
table.setcellselectionenabled(true);
table.setcolumnselectionallowed(true);
for (int i = 0; i < names.length; i++) {
tablecolumn column = table.getcolumn(names[i]);
column.setpreferredwidth(110);
}
table.setautoresizemode(table.auto_resize_off);
jscrollpane sp = new jscrollpane(table);
sp.setverticalscrollbarpolicy(sp.vertical_scrollbar_never);
sp.sethorizontalscrollbarpolicy(sp.horizontal_scrollbar_always);
add(sp);
}
public dimension getpreferredsize() {
return new dimension(800,170);
}
public dimension getmaximumsize() {
return new dimension(800,170);
}
private void programchange(int program) {
if (instruments != null) {
synthesizer.loadinstrument(instruments[program]);
}
cc.channel.programchange(program);
if (record) {
createshortevent(program, program);
}
}
}
/**
* a collection of midi controllers.
*/
class controls extends jpanel implements actionlistener, changelistener, itemlistener {
public jbutton recordb;
jmenu menu;
int filenum = 0;
public controls() {
setlayout(new boxlayout(this, boxlayout.y_axis));
setborder(new emptyborder(5,10,5,10));
jpanel p = new jpanel();
p.setlayout(new boxlayout(p, boxlayout.x_axis));
velos = createslider("velocity", p);
press = createslider("pressure", p);
revbs = createslider("reverb", p);
// create a slider with a 14-bit range of values for pitch-bend
bends = create14bitslider("bend", p);
p.add(box.createhorizontalstrut(10));
add(p);
p = new jpanel();
p.setborder(new emptyborder(10,0,10,0));
p.setlayout(new boxlayout(p, boxlayout.x_axis));
jcombobox combo = new jcombobox();
combo.setpreferredsize(new dimension(120,25));
combo.setmaximumsize(new dimension(120,25));
for (int i = 1; i <= 16; i++) {
combo.additem("channel " + string.valueof(i));
}
combo.additemlistener(this);
p.add(combo);
p.add(box.createhorizontalstrut(20));
mutecb = createcheckbox("mute", p);
solocb = createcheckbox("solo", p);
monocb = createcheckbox("mono", p);
//sustcb = createcheckbox("sustain", p);
createbutton("all notes off", p);
p.add(box.createhorizontalstrut(10));
p.add(mouseovercb);
p.add(box.createhorizontalstrut(10));
recordb = createbutton("record...", p);
add(p);
}
public jbutton createbutton(string name, jpanel p) {
jbutton b = new jbutton(name);
b.addactionlistener(this);
p.add(b);
return b;
}
private jcheckbox createcheckbox(string name, jpanel p) {
jcheckbox cb = new jcheckbox(name);
cb.additemlistener(this);
p.add(cb);
return cb;
}
private jslider createslider(string name, jpanel p) {
jslider slider = new jslider(jslider.horizontal, 0, 127, 64);
slider.addchangelistener(this);
titledborder tb = new titledborder(new etchedborder());
tb.settitle(name + " = 64");
slider.setborder(tb);
p.add(slider);
p.add(box.createhorizontalstrut(5));
return slider;
}
private jslider create14bitslider(string name, jpanel p) {
jslider slider = new jslider(jslider.horizontal, 0, 16383, 8192);
slider.addchangelistener(this);
titledborder tb = new titledborder(new etchedborder());
tb.settitle(name + " = 8192");
slider.setborder(tb);
p.add(slider);
p.add(box.createhorizontalstrut(5));
return slider;
}
public void statechanged(changeevent e) {
jslider slider = (jslider) e.getsource();
int value = slider.getvalue();
titledborder tb = (titledborder) slider.getborder();
string s = tb.gettitle();
tb.settitle(s.substring(0, s.indexof('=')+1) + s.valueof(value));
if (s.startswith("velocity")) {
cc.velocity = value;
} else if (s.startswith("pressure")) {
cc.channel.setchannelpressure(cc.pressure = value);
} else if (s.startswith("bend")) {
cc.channel.setpitchbend(cc.bend = value);
} else if (s.startswith("reverb")) {
cc.channel.controlchange(reverb, cc.reverb = value);
}
slider.repaint();
}
public void itemstatechanged(itemevent e) {
if (e.getsource() instanceof jcombobox) {
jcombobox combo = (jcombobox) e.getsource();
cc = channels[combo.getselectedindex()];
cc.setcomponentstates();
} else {
jcheckbox cb = (jcheckbox) e.getsource();
string name = cb.gettext();
if (name.startswith("mute")) {
cc.channel.setmute(cc.mute = cb.isselected());
} else if (name.startswith("solo")) {
cc.channel.setsolo(cc.solo = cb.isselected());
} else if (name.startswith("mono")) {
cc.channel.setmono(cc.mono = cb.isselected());
} else if (name.startswith("sustain")) {
cc.sustain = cb.isselected();
cc.channel.controlchange(sustain, cc.sustain ? 127 : 0);
}
}
}
public void actionperformed(actionevent e) {
jbutton button = (jbutton) e.getsource();
if (button.gettext().startswith("all")) {
for (int i = 0; i < channels.length; i++) {
channels[i].channel.allnotesoff();
}
for (int i = 0; i < keys.size(); i++) {
((key) keys.get(i)).setnotestate(off);
}
} else if (button.gettext().startswith("record")) {
if (recordframe != null) {
recordframe.tofront();
} else {
recordframe = new recordframe();
}
}
}
} // end class controls
/**
* a frame that allows for midi capture & saving the captured data.
*/
class recordframe extends jframe implements actionlistener, metaeventlistener {
public jbutton recordb, playb, saveb;
vector tracks = new vector();
defaultlistmodel listmodel = new defaultlistmodel();
tablemodel datamodel;
jtable table;
public recordframe() {
super("midi capture");
addwindowlistener(new windowadapter() {
public void windowclosing(windowevent e) {recordframe = null;}
});
sequencer.addmetaeventlistener(this);
try {
sequence = new sequence(sequence.ppq, 10);
} catch (exception ex) { ex.printstacktrace(); }
jpanel p1 = new jpanel(new borderlayout());
jpanel p2 = new jpanel();
p2.setborder(new emptyborder(5,5,5,5));
p2.setlayout(new boxlayout(p2, boxlayout.x_axis));
recordb = createbutton("record", p2, true);
playb = createbutton("play", p2, false);
saveb = createbutton("save...", p2, false);
getcontentpane().add("north", p2);
final string[] names = { "channel #", "instrument" };
datamodel = new abstracttablemodel() {
public int getcolumncount() { return names.length; }
public int getrowcount() { return tracks.size();}
public object getvalueat(int row, int col) {
if (col == 0) {
return ((trackdata) tracks.get(row)).channum;
} else if (col == 1) {
return ((trackdata) tracks.get(row)).name;
}
return null;
}
public string getcolumnname(int col) {return names[col]; }
public class getcolumnclass(int c) {
return getvalueat(0, c).getclass();
}
public boolean iscelleditable(int row, int col) {
return false;
}
public void setvalueat(object val, int row, int col) {
if (col == 0) {
((trackdata) tracks.get(row)).channum = (integer) val;
} else if (col == 1) {
((trackdata) tracks.get(row)).name = (string) val;
}
}
};
table = new jtable(datamodel);
tablecolumn col = table.getcolumn("channel #");
col.setmaxwidth(65);
table.sizecolumnstofit(0);
jscrollpane scrollpane = new jscrollpane(table);
emptyborder eb = new emptyborder(0,5,5,5);
scrollpane.setborder(new compoundborder(eb,new etchedborder()));
getcontentpane().add("center", scrollpane);
pack();
dimension d = toolkit.getdefaulttoolkit().getscreensize();
int w = 210;
int h = 160;
setlocation(d.width/2 - w/2, d.height/2 - h/2);
setsize(w, h);
setvisible(true);
}
public jbutton createbutton(string name, jpanel p, boolean state) {
jbutton b = new jbutton(name);
b.setfont(new font("serif", font.plain, 10));
b.setenabled(state);
b.addactionlistener(this);
p.add(b);
return b;
}
public void actionperformed(actionevent e) {
jbutton button = (jbutton) e.getsource();
if (button.equals(recordb)) {
record = recordb.gettext().startswith("record");
if (record) {
track = sequence.createtrack();
starttime = system.currenttimemillis();
// add a program change right at the beginning of
// the track for the current instrument
createshortevent(program,cc.col*8+cc.row);
recordb.settext("stop");
playb.setenabled(false);
saveb.setenabled(false);
} else {
string name = null;
if (instruments != null) {
name = instruments[cc.col*8+cc.row].getname();
} else {
name = integer.tostring(cc.col*8+cc.row);
}
tracks.add(new trackdata(cc.num+1, name, track));
table.tablechanged(new tablemodelevent(datamodel));
recordb.settext("record");
playb.setenabled(true);
saveb.setenabled(true);
}
} else if (button.equals(playb)) {
if (playb.gettext().startswith("play")) {
try {
sequencer.open();
sequencer.setsequence(sequence);
} catch (exception ex) { ex.printstacktrace(); }
sequencer.start();
playb.settext("stop");
recordb.setenabled(false);
} else {
sequencer.stop();
playb.settext("play");
recordb.setenabled(true);
}
} else if (button.equals(saveb)) {
try {
file file = new file(system.getproperty("user.dir"));
jfilechooser fc = new jfilechooser(file);
fc.setfilefilter(new javax.swing.filechooser.filefilter() {
public boolean accept(file f) {
if (f.isdirectory()) {
return true;
}
return false;
}
public string getdescription() {
return "save as .mid file.";
}
});
if (fc.showsavedialog(null) == jfilechooser.approve_option) {
savemidifile(fc.getselectedfile());
}
} catch (securityexception ex) {
javasound.showinfodialog();
ex.printstacktrace();
} catch (exception ex) {
ex.printstacktrace();
}
}
}
public void meta(metamessage message) {
if (message.gettype() == 47) { // 47 is end of track
playb.settext("play");
recordb.setenabled(true);
}
}
public void savemidifile(file file) {
try {
int[] filetypes = midisystem.getmidifiletypes(sequence);
if (filetypes.length == 0) {
system.out.println("can't save sequence");
} else {
if (midisystem.write(sequence, filetypes[0], file) == -1) {
throw new ioexception("problems writing to file");
}
}
} catch (securityexception ex) {
javasound.showinfodialog();
} catch (exception ex) {
ex.printstacktrace();
}
}
class trackdata extends object {
integer channum; string name; track track;
public trackdata(int channum, string name, track track) {
this.channum = new integer(channum);
this.name = name;
this.track = track;
}
} // end class trackdata
} // end class recordframe
public static void main(string args[]) {
final midisynth midisynth = new midisynth();
midisynth.open();
jframe f = new jframe("midi synthesizer");
f.addwindowlistener(new windowadapter() {
public void windowclosing(windowevent e) {system.exit(0);}
});
f.getcontentpane().add("center", midisynth);
f.pack();
dimension screensize = toolkit.getdefaulttoolkit().getscreensize();
int w = 760;
int h = 470;
f.setlocation(screensize.width/2 - w/2, screensize.height/2 - h/2);
f.setsize(w, h);
f.setvisible(true);
}
}
程序有点长，不全部贴出来了，最下面附上下载地址，可以打包下载，下面来看看运行结果：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。