Java相當於C＃system.beep？

Question

我正在開發一個Java程序，我真的需要能夠以某種頻率和持續時間播放聲音，類似於C＃方法System.Beep，我知道如何在C＃中使用它，但是我可以'在Java中找到一種方法來做到這一點。有沒有一些等價的方法可以做到這一點？如果你試圖播放時間的任何

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

編輯

，並用不同的聲音，你應該看看到Java MIDI庫：

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

我不認爲有一種方法可以在Java中用「嘟嘟」來播放音調。您需要使用我認爲的javax.sound.* API ......除非您可以找到能夠爲您簡化事情的第三方庫。

如果你想走這條路，那麼this page可能會給你一些想法。

Answer 2

您可以使用此。默認的嘟嘟聲將無法滿足您的需求，因爲您無法更改嗶聲的長度。

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

Answer 3

你可以得到工具包類here，該方法beep()定義的參考。

Answer 4

只是打印：至少

System.out.println("\007") 

作品在MacOS。

Answer 5

//Here's the full code that will DEFINITELY work: (can copy & paste) 

import java.awt.*; 

public class beeper 
{ 
    public static void main(String args[]) 
    { 
     Toolkit.getDefaultToolkit().beep(); 
    } 
} 

Answer 6

我已經在一起攻擊了一個適用於我的函數。它使用了一堆來自javax.sound.sampled的東西。我已經將它與聲音格式配合使用，我的系統會自動從AudioSystem.getClip()中提供一個新的剪輯。可能有各種方式可以使它變得更健壯，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); 
    } 
} 

編輯： 顯然有人在改善我的代碼。我還沒有嘗試過，但給它一個： https://gist.github.com/jbzdak/61398b8ad795d22724dd

Answer 7

另一種解決方案，Windows依賴是使用JNA和直接調用Windows的內核32中提供的Windows Beep function。不幸的是，JNA中的Kernel32並沒有在4.2.1中提供這種方法，但是你可以很容易地擴展它。

public interface Kernel32 extends com.sun.jna.platform.win32.Kernel32 { 

     /** 
     * Generates simple tones on the speaker. The function is synchronous; 
     * it performs an alertable wait and does not return control to its caller until the sound finishes. 
     * 
     * @param dwFreq : The frequency of the sound, in hertz. This parameter must be in the range 37 through 32,767 (0x25 through 0x7FFF). 
     * @param dwDuration : The duration of the sound, in milliseconds. 
     */ 
     public abstract void Beep(int dwFreq, int dwDuration); 
} 

要使用它：

static public void main(String... args) throws Exception { 
    Kernel32 kernel32 = (Kernel32) Native.loadLibrary("kernel32", Kernel32.class); 
    kernel32.Beep(800, 3000); 
} 

如果你用maven必須添加以下的依賴：

<dependency> 
    <groupId>net.java.dev.jna</groupId> 
    <artifactId>jna</artifactId> 
    <version>4.2.1</version> 
</dependency> 
<dependency> 
    <groupId>net.java.dev.jna</groupId> 
    <artifactId>jna-platform</artifactId> 
    <version>4.2.1</version> 
</dependency>