上一篇：js与applet的相互调用。

如何捕获音频及输出音频。

这是我原来用过的两段代码，输出音频和捕获音频。
构造器里的socket是用来接受来自网络的音频数据。不做网络音频可以去掉它。

希望能与大家分享经验。8-）

import java.io.*;
import javax.sound.sampled.*;
import java.net.*;

/**
* Title:        VoiceChat
* Description:  输出音频（放音程序）
* Copyright:    Copyright (c) 2001
* Company:
* @author       你猜！
* @version 1.0
*/

class Playback implements Runnable {

       final int bufSize = 16384;
       SourceDataLine line;
       Thread thread;
       Socket s;

       Playback(Socket s){//构造器取得socket以获得网络输入流
         this.s=s;
       }
       public void start() {

           thread = new Thread(this);
           thread.setName("Playback");
           thread.start();
       }

       public void stop() {
           thread = null;
       }

       public void run() {

           AudioFormat format =new AudioFormat(8000,16,2,true,true);//AudioFormat(float sampleRate, int sampleSizeInBits, int channels, boolean signed, boolean bigEndian）
           BufferedInputStream playbackInputStream;

           try {
             playbackInputStream=new BufferedInputStream(new AudioInputStream(s.getInputStream(),format,2147483647));//封装成音频输出流，如果网络流是经过压缩的需在此加套解压流
           }
           catch (IOException ex) {
               return;
           }

           DataLine.Info info = new DataLine.Info(SourceDataLine.class,format);

           try {
               line = (SourceDataLine) AudioSystem.getLine(info);
               line.open(format, bufSize);
           } catch (LineUnavailableException ex) {
               return;
           }

           byte[] data = new byte[1024];//此处数组的大小跟实时性关系不大，可根据情况进行调整
           int numBytesRead = 0;
           line.start();

           while (thread != null) {
              try{
                 numBytesRead = playbackInputStream.read(data);
                 line.write(data, 0,numBytesRead);
              } catch (IOException e) {
                   break;
               }
           }

           if (thread != null) {
               line.drain();
           }

           line.stop();
           line.close();
           line = null;
       }
}

import java.io.*;
import javax.sound.sampled.*;
import java.net.*;

/**
* Title:        VoiceChat
* Description:  音频捕捉（录音程序）
* Copyright:    Copyright (c) 2001
* Company:
* @author       你猜！
* @version 1.0
*/

class Capture implements Runnable {

       TargetDataLine line;
       Thread thread;
       Socket s;
       BufferedOutputStream captrueOutputStream;

       Capture(Socket s){//构造器取得socket以获得网络输出流
         this.s=s;
       }

       public void start() {

           thread = new Thread(this);
           thread.setName("Capture");
           thread.start();
       }

       public void stop() {
           thread = null;
       }

       public void run() {

           try {
             captrueOutputStream=new BufferedOutputStream(s.getOutputStream());//建立输出流此处可以加套压缩流用来压缩数据
           }
           catch (IOException ex) {
               return;
           }

           AudioFormat format =new AudioFormat(8000,16,2,true,true);//AudioFormat(float sampleRate, int sampleSizeInBits, int channels, boolean signed, boolean bigEndian）
           DataLine.Info info = new DataLine.Info(TargetDataLine.class,format);

           try {
               line = (TargetDataLine) AudioSystem.getLine(info);
               line.open(format, line.getBufferSize());
           } catch (Exception ex) {
               return;
           }

           byte[] data = new byte[1024];//此处的1024可以情况进行调整，应跟下面的1024应保持一致
           int numBytesRead=0;
           line.start();

           while (thread != null) {
               numBytesRead = line.read(data, 0,1024);//取数据（1024）的大小直接关系到传输的速度，一般越小越快，
               try {
                 captrueOutputStream.write(data, 0, numBytesRead);//写入网络流
               }
               catch (Exception ex) {
                   break;
               }
           }

           line.stop();
           line.close();
           line = null;

           try {
               captrueOutputStream.flush();
               captrueOutputStream.close();
           } catch (IOException ex) {
               ex.printStackTrace();
           }
       }
}

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