播放MP3的Java

Question

我試圖播放MP3文件，我的桌面上。我有些東西可以播放MP3，但我無法調節音量。儘管它應該按照文檔工作。我的代碼：

我用這個：https://code.google.com/p/java-audio-player/

import maryb.player.Player; 

public class MusicPlayer { 

    private Player player; 
    private float volume; 
    private String filePath; 

    /** 
    * Gets the location of the file being played. 
    * @return 
    */ 
    public String getFileLocation() { 
     return filePath; 
    } 

    /** 
    * Gets the volume at which the music file is being played. 
    * @return 
    */ 
    public float getVolume() { 
     return volume; 
    } 

    /** 
    * Sets the current volume of the music file being played. 
    * @param volume 
    */ 
    public void setVolume(float volume) { 
     this.player.setCurrentVolume(volume); 
    } 

    /** 
    * Constructs a new MusicPlayer object, to use the specified music file. 
    * @param filePath - path to the music file. 
    * @param volume - volume the file should be played at. 
    */ 
    public MusicPlayer(String filePath, float volume) { 
     try { 
      player = new Player(); 
      player.setCurrentVolume(volume); 
      player.setSourceLocation(filePath); 
    } catch(Exception e) { 
     e.printStackTrace(); 
    } 
} 

/** 
* Plays the music file. 
*/ 
public void play() { 
    if (player != null && !player.getSourceLocation().equals(null) || !player.getSourceLocation().equals("")) { 
     player.play(); 
    } 
} 

/** 
* Pauses the music file. 
*/ 
public void pause() { 
    if (player != null && !player.getSourceLocation().equals(null) || !player.getSourceLocation().equals("")) { 
     player.pause(); 
    } 
} 

/** 
* Stops the music file. 
*/ 
public void stop() { 
    if (player != null && !player.getSourceLocation().equals(null) || !player.getSourceLocation().equals("")) { 
     player.stop(); 
    } 
} 

public static void main(String[] args) { 
    MusicPlayer player = new MusicPlayer(signlink.findcachedir() + "music.mp3", 0.1f); 
    player.play(); 
    } 
} 

此：

player.setCurrentVolume(volume); 

似乎並不奏效，因爲無論我設置把作爲參數，它仍然是相同的，音量不會改變。我確實問過一個問題，但沒有得到迴應，我仍然在尋找答案，問題在於;我可以使用哪些API用於播放MP3帶音量調節和暫停和停止音樂的能力，非常感謝，薩姆/

Answer 1

JLayer是用於播放音樂（包括mp3）文件與Java一個不錯的選擇。它可以暫停，停止，找道，等等。你可以給玩家一個小的修改，以更改線路增益/音量到JLayer類之一 - 見Changing volume in Java when using JLayer。用JLayer改變音量可能還有另一種更清晰的方法，但上面的工作。