如何在Vaadin 14中播放.mp3文件

Question

I want to play.mp3 files in Vaadin 14. This is my audio player.

import com.vaadin.flow.component.Component;
import com.vaadin.flow.component.Tag;

@Tag("audio")
public class AudioPlayer  extends Component {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public AudioPlayer(){
        getElement().setAttribute("controls",true);

    }

    public  void setSource(String path){
        getElement().setProperty("src",path);
    }
}

AudioPlayer player = new AudioPlayer();
player.setSource("music/my music file.mp3");
add(player);

But when I try to play.mp3 files, nothing happens. What have I missed? Do I need to convert.mp3 files to.wav before? How can I do that just temporary. I'm not planning to save any.wav files on the computer, because I already have.mp3 files stored.

Answer 1

Your approach should work, I just create a PR to the Vaadin cookbook with a recipe for this.

Note that the browser needs to be able to access the audio file through that same path. If you set the src to audio/mysong.mp3 , then you should be able to open it in the browser also as eg localhost:8080/audio/mysong.mp3 (or the equivalent URL for your setup).

Take a look at the ways of importing in Vaadin to see where to put your file, in particular the Resource Cheat Sheet for static files.

Edit:

I'm not sure why your files don't work on the first try, but I could reproduce it in your project, also with my own mp3 files. You can see an error 416 in the console, something to do with a mismatch in the range of bytes requested.

I found a workaround that you could try (you might want to move your audio to just src/main/resources for this, and/or update the AudioPlayer to accept an AbstractStreamResource ):

if(!reverseTranslation.getValue()) {
    frenchSentence.setValue(sentenceInFrench);
    String audioPath = "/META-INF/resources/audio/" + sentenceInFrench + ".mp3";
    
    AbstractStreamResource resource =
            new StreamResource(sentenceInFrench, () -> getClass().getResourceAsStream(audioPath));
    player.getElement().setAttribute("src", resource);
}