Java tutorial
/* * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ package org.royaldev.royalcommands.tools; import com.google.common.collect.ImmutableList; import org.json.simple.JSONObject; import org.json.simple.parser.JSONParser; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.UUID; import java.util.concurrent.Callable; public class NameFetcher implements Callable<Map<UUID, String>> { private static final String PROFILE_URL = "https://sessionserver.mojang.com/session/minecraft/profile/"; private final JSONParser jsonParser = new JSONParser(); private final List<UUID> uuids; public NameFetcher(List<UUID> uuids) { this.uuids = ImmutableList.copyOf(uuids); } @Override public Map<UUID, String> call() throws Exception { Map<UUID, String> uuidStringMap = new HashMap<>(); for (UUID uuid : uuids) { HttpURLConnection connection = (HttpURLConnection) new URL( PROFILE_URL + uuid.toString().replace("-", "")).openConnection(); JSONObject response = (JSONObject) jsonParser.parse(new InputStreamReader(connection.getInputStream())); String name = (String) response.get("name"); if (name == null) continue; String cause = (String) response.get("cause"); String errorMessage = (String) response.get("errorMessage"); if (cause != null && cause.length() > 0) throw new IllegalStateException(errorMessage); uuidStringMap.put(uuid, name); } return uuidStringMap; } }