java自身的库实现录制扬声器的音频

一般来说，录制应用程序或扬声器的音频可以通过以下几种方式
windows下的钩子函数 线程进行监听
使用自带的库文件 对max进行操作
写一个虚拟声卡 起一个类似代理的作用
这里实现的是用javax.sounds库实现的，不过在这之前需要设置一下监听设备：

监听线路的问题:貌似只能麦克风监听或扬声器数据监听
主函数如下：

private static String OUTPUT_FILE ="C:\\2.wav";
private static String RECORD_PORT_SELECT = "MICROPHONE";
private static float RECORD_VOLUME_LEVEL = 0.8f;
//---------------------
//输出文件目录 默认只支持wav一类
File outputFile =new File(OUTPUT_FILE);
			    //初始化系统
AudioFormat recordingFormat =new AudioFormat(
			    	AudioFormat.Encoding.PCM_SIGNED,
			    	44100.0F, 16, 2, 4, 44100.0F,
			    	false);
			        //录制线
TargetDataLine recordLine =null;
			   recordLine = (TargetDataLine)
AudioSystem.getTargetDataLine(recordingFormat);
recordLine.open(recordingFormat);
			 adjustRecordingVolume();
AudioFileFormat.Type fileType =	AudioFileFormat.Type.WAVE;
//开启录制线程
KokRecorder recorder = new  KokRecorder(recordLine,fileType,outputFile);
recorder.start();
			    	//System.out.println("Playing"+
			    		//"Song and Recording...");
			    	//初始化视图
CanvasFrame canvas = new CanvasFrame("录制");	        	    canvas.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

KokRecorder 的类

class KokRecorder extends Thread 
{ 
	private TargetDataLine recordLine; 
	private AudioFileFormat.Type recFormat;
	private AudioInputStream myAIS; 
	private File myOutFile; 
	public KokRecorder(TargetDataLine inLine, AudioFileFormat.Type tgtFmt, File inFile) { 
		recordLine = inLine; 
		myAIS = new AudioInputStream(inLine); 
		recFormat = tgtFmt;
		myOutFile = inFile; 
		} 
	   public void run() 
		{ try { 
		   //将线上监听的值 转向输出文件
			AudioSystem.write( myAIS,recFormat, myOutFile); 
			} catch (IOException e) { 
				e.printStackTrace(); } 
		}
		public void start() {
			recordLine.start(); 
			super.start(); 
			} 
		public void stopRecording() { 
				recordLine.stop(); 
				recordLine.close(); } 
}

相关设置

 public static void adjustRecordingVolume()
    throws Exception {
    Port.Info recPortInfo =new Port.Info(Port.class,
    	RECORD_PORT_SELECT, true);
  Port recPort = (Port)AudioSystem.getLine(
    	recPortInfo);
    setRecControlValue(recPort);
    }
  private static void setRecControlValue(Port inPort)
    throws Exception {
    inPort.open();
    Control [] controls = inPort.getControls();
     for(int i=0; i<controls.length; i++) {
  if(controls[i] instanceof
    	CompoundControl) {
    	Control[] members =
    		((CompoundControl)
    		controls[i]).
    		getMemberControls();
    for(int j=0; j<members.length; j++) {
    		setCtrl(members[j]);
    		} 
    	} 
    else
    	setCtrl(controls[i]);
    } 
    inPort.close();
    }
    private static void setCtrl(Control ctl) {
    	  if(ctl.getType().toString(
    	    	).equals("Select")) {
    	    	((BooleanControl)
    	    		ctl).setValue(true);
    	    	}
    	    if(ctl.getType().toString(
    	    	).equals("Volume")) {
    	    	FloatControl vol =
    	    		(FloatControl) ctl;
    	    	float setVal = vol.getMinimum()
    	    		+ (vol.getMaximum()
    	    		- vol.getMinimum())
    	    		* RECORD_VOLUME_LEVEL;
    	  	vol.setValue(setVal);
    	    } 
    }