开发学院 WEB开发 Jsp 教你如何使用javax.sound.midi包阅读

教你如何使用javax.sound.midi包

　2008-01-05 08:45:16　来源：WEB开发网　闂傚倸鍊风欢姘缚瑜嶈灋闁圭虎鍠栫粻顖炴煥閻曞倹瀚�

闂傚倸鍊风粈渚€骞夐敓鐘插瀭闁汇垹鐏氬畷鏌ユ煙閹殿喖顣奸柛搴＄У閵囧嫰骞掗幋婵冨亾閻㈢ǹ纾婚柟鐐灱濡插牊绻涢崱妤冃℃繛宀婁簽缁辨捇宕掑鎵佹瀸闂佺懓鍤栭幏锟�

濠电姷鏁告慨顓㈠箯閸愵喖宸濇い鎾寸箘閹规洟姊绘笟鈧ḿ褍煤閵堝悿娲Ω閳轰胶鍔﹀銈嗗笂閼冲爼鍩婇弴銏＄厪闁搞儮鏅涙禒褏绱掓潏鈺佷槐闁轰焦鎹囬弫鎾绘晸閿燂拷闂傚倸鍊风欢姘缚瑜嶈灋闁圭虎鍠栫粻顖炴煥閻曞倹瀚�　　闂傚倸鍊烽懗鑸电仚缂備胶绮〃鍛村煝瀹ュ鍗抽柕蹇曞У閻庮剟姊虹紒妯哄闁圭⒈鍋嗛惀顏囶樄闁哄本娲樼换婵婄疀閺囩姷鐛ラ梻浣哄帶婢瑰﹥绂嶅⿰鍫氣偓鏃堝礃椤忎礁浜鹃柨婵嗛婢ь喖霉閻樻瑥瀚粻楣冩煕椤愩倕鏋庨柣蹇嬪劜閵囧嫰寮村Ο鍝勫Е濡炪們鍨洪悷鈺呭箖閳╁啯鍎熼柕鍥у簻閹凤拷

核心提示：package lookbook.midi;import javax.sound.midi.*;import java.io.*;import java.net.*;/** * Title: * Description: how to use java midi

package lookbook.midi;
import javax.sound.midi.*;
import java.io.*;
import java.net.*;
/**
* Title: 
* Description: how to use java midi from javax.sound.midi´s Package
* Copyright: Copyright (c) 2003
* Company: 
* @author lookbook
* @version 1.0
*/

public class MidiMain {
PRivate static String midiFile = "town.mid";
private static String midiURI = "http://hostname/midifile";
private Sequence sequence =null;
public MidiMain() {
this.loadAndPlay();
}
public void loadAndPlay(){
try {
// From file
sequence = MidiSystem.getSequence(new File(midiFile));

// From URL
// sequence = MidiSystem.getSequence(new URL("http://hostname/midifile"));

// Create a sequencer for the sequence
Sequencer sequencer = MidiSystem.getSequencer();
sequencer.open();
sequencer.setSequence(sequence);

//Determining the Duration of a Midi Audio File
double durationInSecs = sequencer.getMicrosecondLength() / 1000000.0;
System.out.println("the duration of this audio is "+durationInSecs+"secs.");

//Determining the Position of a Midi Sequencer
double seconds = sequencer.getMicrosecondPosition() / 1000000.0;
System.out.println("the Position of this audio is "+seconds+"secs.");

//Setting the Volume of Playing Midi Audio
if (sequencer instanceof Synthesizer) {
Synthesizer synthesizer = (Synthesizer)sequencer;
MidiChannel[] channels = synthesizer.getChannels();

// gain is a value between 0 and 1 (loudest)
double gain = 0.9D;
for (int i=0; i<channels.length; i++) {
channels[i].controlChange(7, (int)(gain * 127.0));
}
}

// Start playing
sequencer.start();

//Determining the Position of a Midi Sequencer
Thread.currentThread().sleep(5000);
seconds = sequencer.getMicrosecondPosition() / 1000000.0;
System.out.println("the Position of this audio is "+seconds+"secs.");

//Add a listener for meta message events
sequencer.addMetaEventListener(
new MetaEventListener() {
public void meta(MetaMessage event) {
// Sequencer is done playing
if (event.getType() == 47) {
System.out.println("Sequencer is done playing.");
}
}
});
}catch (MalformedURLException e) {
}catch (IOException e) {
}catch (MidiUnavailableException e) {
}catch (InvalidMidiDataException e) {
}catch (InterruptedException e){
}
}

public static void main(String[] args) {
MidiMain midi = new MidiMain();

}

}