允许Java应用程序在录制音频时继续运行

我正在尝试嵌入一些我找到的（原创）代码，用于将音频输入录制并保存到JavaSwing应用程序中。我的问题是，我希望音频录制与应用程序正在执行的其他操作同时运行，但实际上，应用程序会暂停，直到音频录制完成。我怎样才能防止这种情况发生

下面是我的代码的简化版本，它产生了这个问题。显示“Now recording”（现在录制）的行直到音频录制完成后才会出现

import javax.sound.sampled.*;

import java.io.*;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.io.File;

import javafx.embed.swing.JFXPanel;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Example extends JPanel {

    protected static final long serialVersionUID = 1L;

    // whether we've started recording
    private boolean startedRecording;

    // record duration, in milliseconds
    static final long RECORD_TIME = 5000;  // 5 seconds

    // format of audio file
    AudioFileFormat.Type fileType = AudioFileFormat.Type.WAVE;

    // path of the wav file
    File wavFile;

    // the line from which audio data is captured
    TargetDataLine line;

    public Example( String output_fn ) {
        wavFile = new File(output_fn);
        startedRecording = false;
        setPreferredSize(new Dimension(100,100));
        createPanel();
    }

    public static JFXPanel createPanel() {
        return new JFXPanel();
    }

    /**
     * Defines an audio format
     */
    AudioFormat getAudioFormat() {
        float sampleRate = 16000;
        int sampleSizeInBits = 8;
        int channels = 2;
        boolean signed = true;
        boolean bigEndian = true;
        AudioFormat format = new AudioFormat(sampleRate, sampleSizeInBits,
                                             channels, signed, bigEndian);
        return format;
    }

    /**
     * Captures the sound and record into a WAV file
     */
    public void start() {
        try {
            AudioFormat format = getAudioFormat();
            DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);

            // checks if system supports the data line
            if (!AudioSystem.isLineSupported(info)) {
                System.out.println("Line not supported");
                System.exit(0);
            }
            line = (TargetDataLine) AudioSystem.getLine(info);
            line.open(format);
            line.start();   // start capturing

            System.out.println("In utils.Recorder: Start capturing...");

            AudioInputStream ais = new AudioInputStream(line);

            System.out.println("In utils.Recorder: Start recording...");

            // start recording
            AudioSystem.write(ais, fileType, wavFile);

        } catch (LineUnavailableException ex) {
            ex.printStackTrace();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
        repaint();
    }

    /**
     * Closes the target data line to finish capturing and recording
     */
    public void finish() {
        line.stop();
        line.close();
        System.out.println("In utils.Recorder: Finished");
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2   = (Graphics2D)g;
        // start recording
        if ( !startedRecording ) {
            startedRecording = true;
            Thread stopper = new Thread(new Runnable() {
                public void run() {
                    try {
                        Thread.sleep(RECORD_TIME);
                    } catch (InterruptedException ex) {
                        ex.printStackTrace();
                    }
                    Example.this.finish();
                }
            });
            stopper.start();
            this.start();
        }
        // display message
        g2.drawString("Now recording", 50, 50);
    }

    public static void main(String[] args) {
        final Example eg = new Example("TestRecordAudio.wav");
        JFrame f    = new JFrame();
        f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        f.add(eg, BorderLayout.CENTER);
        f.pack();
        f.setVisible(true);
        f.repaint();
    }
}

---

您正在上调用

start

，从而阻止了其他任何事情的发生。您需要在不同的线程上调用音频调用代码

---

除非你想面对死亡的灰色屏幕，否则千万不要在Swing线程上运行长时间运行的任务

绘画方法是用来绘画的！不要在paint方法中执行任何其他操作，这根本不合适，而且是一个非常非常糟糕的主意

创建一个

JButton

（或

JToggleButton

）并使用该按钮启动/停止录制

使用

line.stop（）

和

line.close（）

停止录制

Swing是一个单线程环境，在事件调度线程的上下文中执行的任何长时间运行或阻塞代码都会阻止它处理事件队列，使程序看起来像挂起了一样，因为它已经挂起了

您可以使用

SwingWorker

，但由于您在录制时没有尝试更新UI，因此使用

线程

看看

欲知详情

用示例更新

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.TargetDataLine;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToggleButton;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestRecord {

    public static void main(String[] args) {
        new TestRecord();
    }

    public TestRecord() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public static class TestPane extends JPanel {

        private JToggleButton recordButton;

        protected static final AudioFileFormat.Type FILE_TYPE = AudioFileFormat.Type.WAVE;
        private TargetDataLine line;

        public TestPane() {
            setLayout(new GridBagLayout());
            recordButton = new JToggleButton("Record");
            recordButton.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    if (recordButton.isSelected()) {
                        startRecording();
                        recordButton.setText("Stop");
                    } else {
                        stopRecording();
                        recordButton.setText("Record");
                    }
                }
            });
            add(recordButton);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

        protected void stopRecording() {

            if (line != null) {

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

            }

        }

        protected void startRecording() {
            if (line == null) {
                Thread t = new Thread(new Runnable() {

                    @Override
                    public void run() {
                        try {
                            AudioFormat format = getAudioFormat();
                            DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);

                            // checks if system supports the data line
                            if (!AudioSystem.isLineSupported(info)) {
                                System.out.println("Line not supported");
                                System.exit(0);
                            }
                            line = (TargetDataLine) AudioSystem.getLine(info);
                            line.open(format);
                            line.start();   // start capturing

                            System.out.println("In utils.Recorder: Start capturing...");

                            AudioInputStream ais = new AudioInputStream(line);

                            System.out.println("In utils.Recorder: Start recording...");

                            // start recording
                            System.out.println("Is recoding");
                            AudioSystem.write(ais, FILE_TYPE, new File("Test.wav"));

                        } catch (LineUnavailableException ex) {
                            ex.printStackTrace();
                        } catch (IOException ioe) {
                            ioe.printStackTrace();
                        }

                        System.out.println("Recording is done");
                    }
                });
                t.start();
            }
        }

        protected AudioFormat getAudioFormat() {
            float sampleRate = 16000;
            int sampleSizeInBits = 8;
            int channels = 2;
            boolean signed = true;
            boolean bigEndian = true;
            AudioFormat format = new AudioFormat(sampleRate, sampleSizeInBits,
                            channels, signed, bigEndian);
            return format;
        }
    }

}

---

（注意：我还不能测试它，因为我没有一条线路可以支持录音……显然）

谢谢。您能否提供代码或参考资料，说明如何执行您的建议？我对线程相关的问题有一些想法，但即使在尝试阅读了大量关于线程管理的内容后，我对线程管理的了解也很少，包括您链接的关于事件调度线程的参考。这可能会有所帮助：您能提供一些关于如何使用线程解决我的问题的更具体细节吗？