我有一个程序,它会询问用户他们想要从可用歌曲列表中播放哪些歌曲,并且在用户选择一首歌曲后,一旦歌曲完成,它会询问用户他们想要再次播放哪首歌曲。我被告知为此使用线路监听器,但即使在使用 oracle 文档后我似乎也不知道如何使用
我的代码
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
String[] pathnames;
File MusicFileChosen;
String musicDir;
boolean songComplete = false;
pathnames = ProgramMap.musicDir.list();
// Print the names of files and directories
for (int ListNum = 0; ListNum < pathnames.length; ListNum++) {
System.out.println(ListNum + 1 + ". " + pathnames[ListNum]);
}
for (int playlistLength = 0; playlistLength < pathnames.length; playlistLength++){
if (!songComplete) {
System.out.println("Which Song would you like to play?");
int musicChoice = input.nextInt();
musicDir = ProgramMap.userDir + "\\src\\Music\\" + pathnames[musicChoice - 1];
MusicFileChosen = new File(musicDir);
PlaySound(MusicFileChosen, pathnames[musicChoice - 1]);
}
}
}
public static void PlaySound(File sound, String FileName){
try{
// Inits the Audio System
Clip clip = AudioSystem.getClip();
AudioInputStream AudioInput = AudioSystem.getAudioInputStream(sound);
//Finds and accesses the clip
clip.open(AudioInput);
//Starts the clip
clip.start();
System.out.println("Now Playing " + FileName);
clip.drain();
}catch (Exception e){
System.out.println("Error playing music");
}
} }
最佳答案
基本上,您需要更改的一件事就是替换它:
for (int playlistLength = 0; playlistLength < pathnames.length; playlistLength++){
类似:
while (true) {
System.out.println("Which Song would you like to play?");
int musicChoice = input.nextInt();
musicDir = ProgramMap.userDir + "\\src\\Music\\" + pathnames[musicChoice - 1];
MusicFileChosen = new File(musicDir);
PlaySound(MusicFileChosen, pathnames[musicChoice - 1]);
}
您可以添加一些逻辑来打破循环。
此外,我建议稍微更改一下 PlaySound
方法:
public static void PlaySound(File sound, String FileName) {
try (final AudioInputStream in = getAudioInputStream(sound)) {
final AudioFormat outFormat = getOutFormat(in.getFormat());
Info info = new Info(SourceDataLine.class, outFormat);
try (final SourceDataLine line =
(SourceDataLine) AudioSystem.getLine(info)) {
if (line != null) {
line.open(outFormat);
line.start();
System.out.println("Now Playing " + FileName);
stream(getAudioInputStream(outFormat, in), line);
line.drain();
line.stop();
}
}
} catch (UnsupportedAudioFileException
| LineUnavailableException
| IOException e) {
System.err.println("Error playing music\n" + e.getMessage());
}
}
private static AudioFormat getOutFormat(AudioFormat inFormat) {
final int ch = inFormat.getChannels();
final float rate = inFormat.getSampleRate();
return new AudioFormat(PCM_SIGNED, rate, 16, ch, ch * 2, rate, false);
}
private static void stream(AudioInputStream in, SourceDataLine line)
throws IOException {
final byte[] buffer = new byte[4096];
for (int n = 0; n != -1; n = in.read(buffer, 0, buffer.length)) {
line.write(buffer, 0, n);
}
}
它需要播放MP3,因为你可能会遇到这样的问题: Unknown frame size .
要向 Java Sound 添加 MP3 读取支持,请将 JMF 的 mp3plugin.jar 添加到应用程序的运行时类路径中。 https://www.oracle.com/technetwork/java/javase/download-137625.html
关于java - 如何使用javax.sound.sampled.LineListener?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61019319/