Java相当于C#system.beep？

Question

我正在研究一个Java程序,我真的需要能够以一定的频率和持续时间播放声音,类似于c#方法System.Beep,我知道如何在C#中使用它,但我找不到一种在Java中执行此操作的方法.是否有一些等效或其他方式来做到这一点？

using System;

class Program
{
    static void Main()
    {
    // The official music of Dot Net Perls.
    for (int i = 37; i <= 32767; i += 200)
    {
        Console.Beep(i, 100);
    }
    }
}

Answer 1

你可以用这个:

java.awt.Toolkit.getDefaultToolkit().beep();

编辑

如果你试图播放持续时间和不同声音的任何东西,你应该真正研究Java MIDI库.默认蜂鸣声无法满足您的需求,因为您无法更改蜂鸣声的长度.

http://www.oracle.com/technetwork/java/index-139508.html

Answer 2

只需打印它:

System.out.println("\007")

至少在MacOS上运行.

Answer 3

我已经编写了一个对我有用的函数。它使用了一堆来自javax.sound.sampled. 我已将其调整为使用我的系统自动提供的新剪辑的音频格式AudioSystem.getClip()。可能有各种各样的方法可以使它更健壮和更高效。

/**
 * Beeps.  Currently half-assumes that the format the system expects is
 * "PCM_SIGNED unknown sample rate, 16 bit, stereo, 4 bytes/frame, big-endian"
 * I don't know what to do about the sample rate.  Using 11025, since that
 * seems to be right, by testing against A440.  I also can't figure out why
 * I had to *4 the duration.  Also, there's up to about a 100 ms delay before
 * the sound starts playing.
 * @param freq
 * @param millis 
 */
public static void beep(double freq, final double millis) {
    try {
        final Clip clip = AudioSystem.getClip();
        AudioFormat af = clip.getFormat();

        if (af.getSampleSizeInBits() != 16) {
            System.err.println("Weird sample size.  Dunno what to do with it.");
            return;
        }

        //System.out.println("format " + af);

        int bytesPerFrame = af.getFrameSize();
        double fps = 11025;
        int frames = (int)(fps * (millis / 1000));
        frames *= 4; // No idea why it wasn't lasting as long as it should.

        byte[] data = new byte[frames * bytesPerFrame];

        double freqFactor = (Math.PI / 2) * freq / fps;
        double ampFactor = (1 << af.getSampleSizeInBits()) - 1;

        for (int frame = 0; frame < frames; frame++) {
            short sample = (short)(0.5 * ampFactor * Math.sin(frame * freqFactor));
            data[(frame * bytesPerFrame) + 0] = (byte)((sample >> (1 * 8)) & 0xFF);
            data[(frame * bytesPerFrame) + 1] = (byte)((sample >> (0 * 8)) & 0xFF);
            data[(frame * bytesPerFrame) + 2] = (byte)((sample >> (1 * 8)) & 0xFF);
            data[(frame * bytesPerFrame) + 3] = (byte)((sample >> (0 * 8)) & 0xFF);
        }
        clip.open(af, data, 0, data.length);

        // This is so Clip releases its data line when done.  Otherwise at 32 clips it breaks.
        clip.addLineListener(new LineListener() {                
            @Override
            public void update(LineEvent event) {
                if (event.getType() == Type.START) {
                    Timer t = new Timer((int)millis + 1, new ActionListener() {
                        @Override
                        public void actionPerformed(ActionEvent e) {
                            clip.close();
                        }
                    });
                    t.setRepeats(false);
                    t.start();
                }
            }
        });
        clip.start();
    } catch (LineUnavailableException ex) {
        System.err.println(ex);
    }
}

编辑：显然有人改进了我的代码。我还没有尝试过，但试一试：https : //gist.github.com/jbzdak/61398b8ad795d22724dd

Answer 4

我认为没有办法在便携式² Java中用“嘟嘟”来播放音乐¹。我认为您需要使用API...除非您能找到可以为您简化操作的第三方库。^{javax.sound.*}

如果您想走这条路，那么此页面可能会给您一些想法。

^{1 - 除非你的用户都是五音不全的人。当然，你可以做一些事情，比如用莫尔斯电码发出嘟嘟声……但这不是一首曲子。}

^{2 - 显然，您可以对 Windows 蜂鸣函数进行本机调用。但这是不可移植的。}