gistfile1.txt

import com.google.gson.Gson;
import com.google.gson.JsonElement;

import java.io.File;
import java.io.FileReader;
import java.io.InputStream;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

public class DownloadLibs {
    private static final String VERSION = "1.14";

    public static void main(String[] args) throws Exception {
        JsonElement json;
        try (FileReader reader = new FileReader(VERSION + ".json")) {
            json = new Gson().fromJson(reader, JsonElement.class);
        }

        Set<String> urls = new LinkedHashSet<>();

        json.getAsJsonObject()
            .getAsJsonArray("libraries")
            .forEach(libraryJson -> urls.add(libraryJson
                    .getAsJsonObject()
                    .getAsJsonObject("downloads")
                    .getAsJsonObject("artifact")
                    .get("url")
                    .getAsString()));

        new File(VERSION).mkdir();

        for (String url : urls) {
            System.out.println("Downloading " + url + "");

            try (InputStream in = new URL(url).openStream()) {
                String[] split = url.split("/");
                Files.copy(in, new File(VERSION + "/" + split[split.length - 1]).toPath(), StandardCopyOption.REPLACE_EXISTING);
            }
        }
    }
}