Java tutorial
/* * This file is part of gwap, an open platform for games with a purpose * * Copyright (C) 2013 * Project play4science * Lehr- und Forschungseinheit fr Programmier- und Modellierungssprachen * Ludwig-Maximilians-Universitt Mnchen * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package gwap.game.quiz; import gwap.game.quiz.action.QuizHighscoreBean; import gwap.model.QuizHighscore; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.persistence.EntityManager; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.transaction.HeuristicMixedException; import javax.transaction.HeuristicRollbackException; import javax.transaction.NotSupportedException; import javax.transaction.RollbackException; import javax.transaction.SystemException; import org.jboss.seam.Component; import org.jboss.seam.ScopeType; import org.jboss.seam.annotations.In; import org.jboss.seam.annotations.Name; import org.jboss.seam.annotations.Scope; import org.jboss.seam.annotations.Startup; import org.jboss.seam.annotations.intercept.BypassInterceptors; import org.jboss.seam.servlet.ContextualHttpServletRequest; import org.jboss.seam.transaction.Transaction; import org.jboss.seam.web.AbstractResource; import org.json.simple.JSONObject; import org.json.simple.parser.JSONParser; import org.json.simple.parser.ParseException; /** * This servlet provides the highscores by returning a HttpServletRespone in * JSON-Format * * @author Jonas Hlzler * */ @Startup @Scope(ScopeType.APPLICATION) @Name("playNHighscoreCommunicationResource") @BypassInterceptors public class PlayNHighscoreCommunicationResource extends AbstractResource { private HttpServletResponse response; @In(create = true) EntityManager entityManager; private String action = ""; private String mode; @Override public String getResourcePath() { return "/highscore"; } @Override public void getResource(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException { new ContextualHttpServletRequest(request) { @Override public void process() throws IOException { doWork(request, response); } }.run(); } private void doWork(HttpServletRequest request, HttpServletResponse response) throws IOException { this.response = response; QuizHighscore quizHighscore = readOutJSONData(request); try { Transaction.instance().begin(); QuizHighscoreBean quizHighscoreBean = (QuizHighscoreBean) Component.getInstance("quizHighscoreBean"); int placeAllTime = 0; int placeThisWeek = 0; List<QuizHighscore> highscores = new ArrayList<QuizHighscore>(); if (action.equals("GetEvaluation")) { placeAllTime = quizHighscoreBean.getPlaceAllTime(quizHighscore.getScore()) + 1; placeThisWeek = quizHighscoreBean.getPlaceThisWeek(quizHighscore.getScore()) + 1; } else if (action.equals("Store")) { if (quizHighscore != null) { quizHighscoreBean.addHighscore(quizHighscore); } } else if (action.equals("GetHighscores")) { if (mode.equals("All Time")) { highscores = quizHighscoreBean.getHighScoresAllTime(); } else { highscores = quizHighscoreBean.getHighScoresThisWeek(); } } JSONObject jsonObject = createJSONForFeedback(highscores, placeAllTime, placeThisWeek); sendJSONObject(jsonObject); Transaction.instance().commit(); } catch (NotSupportedException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (SystemException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (RollbackException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (HeuristicMixedException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (HeuristicRollbackException e) { // TODO Auto-generated catch block e.printStackTrace(); } } private void sendJSONObject(JSONObject jsonObject) { OutputStream outstream = null; try { response.setContentType("text/plain"); outstream = response.getOutputStream(); BufferedWriter out = new BufferedWriter(new OutputStreamWriter(outstream)); jsonObject.writeJSONString(out); out.flush(); outstream.flush(); outstream.close(); } catch (IOException e) { System.out.println("Exception!"); } } private JSONObject createJSONForFeedback(List<QuizHighscore> highscore, int placeAllTime, int placeThisWeek) { JSONObject jsonResult = new JSONObject(); int platz = 0; for (QuizHighscore h : highscore) { Map<String, Object> m = new HashMap<String, Object>(); m.put("Name", h.getUsername()); m.put("PunkteAnzahl", h.getScore()); m.put("Joker", h.getJoker()); m.put("Frage", h.getQuestion()); jsonResult.put("Platz" + platz, m); platz++; } jsonResult.put("Anzahl", platz); jsonResult.put("placeAllTime", placeAllTime); jsonResult.put("placeThisWeek", placeThisWeek); return jsonResult; } private QuizHighscore readOutJSONData(HttpServletRequest request) throws IOException { QuizHighscore quizHighscore = null; BufferedReader reader = request.getReader(); StringBuilder sb = new StringBuilder(); String line = reader.readLine(); while (line != null) { sb.append(line + "\n"); line = reader.readLine(); } reader.close(); String data = sb.toString(); if (data.equals("")) { return null; } JSONParser parser = new JSONParser(); quizHighscore = new QuizHighscore(); quizHighscore.setCreated(new Date()); Object obj; try { obj = parser.parse(data); JSONObject jsonObject = (JSONObject) obj; for (Object k : jsonObject.keySet()) { Object value = jsonObject.get(k); String key = (String) k; if (key.equals("Name")) { quizHighscore.setUsername((String) value); } else if (key.equals("PunkteAnzahl")) { quizHighscore.setScore(((Long) value).intValue()); } else if (key.equals("Joker")) { quizHighscore.setJoker(((Long) value).intValue()); } else if (key.equals("Frage")) { quizHighscore.setQuestion(((Long) value).intValue()); } else if (key.equals("Action")) { this.action = (String) value; } else if (key.equals("HighScoreMode")) { this.mode = (String) value; } } } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } return quizHighscore; } }