Given a Spotify playlist URL, prints out a track listing.

SpotLister.java

import java.io.*;
import java.net.*;
import java.net.http.*;
import java.nio.charset.*;
import java.util.*;
import javax.swing.text.html.parser.*;
import javax.swing.text.html.*;
import javax.swing.text.*;

/**
 * The playlist contains meta tags with name attributes of "music:song", each is a URL
 * to a song page where the meta og:title is the track title and og:description contains
 * the artist
 */
public class SpotLister extends HTMLEditorKit.ParserCallback
{
    private List <String> tracks = new ArrayList <> ();
    private String title, artist;
    static HttpClient client = HttpClient.newHttpClient();

    public SpotLister(String uri)
    {
        list(uri);

        for (var it = tracks.listIterator() ; it.hasNext() ;)
        {
            list(it.next());
            System.out.format("%d. %s / %s%n", it.nextIndex(), title, artist);
        }
    }
    
    private void list(String uri)
    {
    	try
    	{
            var req = HttpRequest.newBuilder(new URI(uri)).build();
            var res = HttpResponse.BodyHandlers.ofInputStream();
            
            new ParserDelegator().parse(new InputStreamReader(client.send(req, res).body(), StandardCharsets.UTF_8), this, true);  		
    	}
    	catch (IOException ex)
    	{
            System.err.format("HTML parsing failed due to %s", ex.getMessage());   		
    	}        
        catch (URISyntaxException ex)
        {
            System.err.format("Invalid URI %s", uri);
        } 
        catch (Exception ex) 
        {
            System.err.format("HTTP request failed due to %s", ex.getMessage());   		
        }
    }
    
    @Override
    public void handleSimpleTag(HTML.Tag t, MutableAttributeSet s, int pos)
    {
    	if (!(t.equals(HTML.Tag.META) && s.isDefined(HTML.Attribute.CONTENT))) return;
        
        var content = s.getAttribute(HTML.Attribute.CONTENT).toString();

        if (s.isDefined(HTML.Attribute.NAME) && "music:song".equals(s.getAttribute(HTML.Attribute.NAME).toString()))
        {
            tracks.add(content);
            return;
        }
        
        if (!s.isDefined("property")) return;
        
        var property = s.getAttribute("property").toString();        
        
        if ("og:description".equals(property)) artist = content.replaceFirst(" ·.*", "");
        else if ("og:title".equals(property)) title = content;        
    }

    public static void main(String[] args)
    {
        Arrays.stream(args).forEach(SpotLister::new);
    }
}

Updated for latest Spotify html output, Dec 2022

Rewritten for new Spotify, July 2023

Updated, October 2023.