通过以下代码,我可以播放和剪切音频文件。
还有其他方法可以避免使用关机钩子吗?
问题是,每当我按下“剪切”按钮时,文件都不会保存,直到我关闭应用程序
谢谢
void play_cut() {
try {
// First, we get the format of the input file
final AudioFileFormat.Type fileType = AudioSystem.getAudioFileFormat(inputAudio).getType();
// Then, we get a clip for playing the audio.
c = AudioSystem.getClip();
// We get a stream for playing the input file.
AudioInputStream ais = AudioSystem.getAudioInputStream(inputAudio);
// We use the clip to open (but not start) the input stream
c.open(ais);
// We get the format of the audio codec (not the file format we got above)
final AudioFormat audioFormat = ais.getFormat();
// We add a shutdown hook, an anonymous inner class.
Runtime.getRuntime().addShutdownHook(new Thread()
{
public void run()
{
// We're now in the hook, which means the program is shutting down.
// You would need to use better exception handling in a production application.
try
{
// Stop the audio clip.
c.stop();
// Create a new input stream, with the duration set to the frame count we reached. Note that we use the previously determined audio format
AudioInputStream startStream = new AudioInputStream(new FileInputStream(inputAudio), audioFormat, c.getLongFramePosition());
// Write it out to the output file, using the same file type.
AudioSystem.write(startStream, fileType, outputAudio);
}
catch(IOException e)
{
e.printStackTrace();
}
}
});
// After setting up the hook, we start the clip.
c.start();
} catch (UnsupportedAudioFileException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (LineUnavailableException e) {
e.printStackTrace();
}
}// end play_cut
实际上,我想知道的是:
我真的需要关机钩吗?
如果我移动这两个代码语句
AudioInputStream startStream = new AudioInputStream(new FileInputStream(inputAudio), audioFormat, c.getLongFramePosition());
AudioSystem.write(startStream, fileType, outputAudio);
c.start()之后的其他地方;我得到一个错误:
永远不会在相应的try语句的正文中抛出java.io.IOException异常-> catch(IOException e)
您是否认为我不借助钩子也可以获得相同的结果?
最佳答案
首先,您的所有注释都是完全多余的,您只需重复使用各种类和方法的名称即可。
对于问题,保存代码位于关闭钩子中,这意味着“在应用程序即将关闭时执行此操作”,这自然意味着在程序即将关闭之前不会保存它。因此,将逻辑从关闭钩子移到它的逻辑位置上-最有可能在方法结尾,甚至在final
块中-就是这样。