questionanswercheckevent.java

一个在线学习系统的服务端SERVLET程序

package eols.event.test;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

import eols.bean.system.*;
import eols.bean.test.*;
import eols.tools.*;
import eols.event.system.*;

public class QuestionAnswerCheckEvent extends QuestionEventHandlerBase {
        /**
         * 事件的处理逻辑
         */
        public void process(ServletContext sc, HttpServletRequest request,
                            HttpServletResponse response, HashMap bean) {
                Result result = new Result();
                String loginID = SessionUtils.getStringSessionAttribute(request, "loginID", null);
                if (loginID == null) {
                        result.setHandleResult("Can not identify your User Id.");
                        result.setSymbol(Result.FAILED);
                        request.setAttribute("result", result);
                        return;
                }
                List questions = SessionUtils.getListSessionAttribute(request, "questions", null);
                if (questions == null) {
                        result.setHandleResult("Can not obtain the question set.");
                        result.setSymbol(Result.FAILED);
                        request.setAttribute("result", result);
                        return;
                }
                int wrong = 0, correct = 0;
                StringBuffer yourA = new StringBuffer();
                StringBuffer correctA = new StringBuffer();
                StringBuffer part;
                for (int i = 0; i < questions.size(); i++){
                        Question temp = (Question)questions.get(i);
                        String answer = temp.getAnswer();
                        correctA.append(answer);
                        if (i != questions.size() - 1) correctA.append(";");

                        part = new StringBuffer();
                        String[] userAnswers = request.getParameterValues(String.valueOf(temp.getId()));
                        for (int j = 0; j < userAnswers.length; j++){
                                yourA.append(userAnswers[j]).append(" ");
                                part.append(userAnswers[j]).append(" ");
                        }
                        if (i != questions.size() - 1) yourA.append(";");
                        temp.setYourA(part.toString());
                        for (int j = 0; j < userAnswers.length; j++) {
                                if (answer.indexOf(userAnswers[j]) == -1) {
                                        temp.setAnswerCorrect(false);
                                        wrong++;
                                        break;
                                } else {
                                        temp.setAnswerCorrect(true);
                                }
                        }
                }
                correct = questions.size() - wrong;
                request.setAttribute("correct", ""+correct);
                request.setAttribute("wrong", ""+wrong);
                request.setAttribute("correctA", correctA.toString());
                request.setAttribute("yourA", yourA.toString());
                // Save the test result
                List records = new ArrayList(questions.size());
                // Put the wrong answer into the user's error pads
                for (int i = 0; i < questions.size(); i++){
                        Question temp = (Question)questions.get(i);
                            TestResult record = new TestResult();
                            record.setUserID(loginID);
                            record.setCorrect(temp.isAnswerCorrect());
                            record.setQuestionID(temp.getId());
                            record.setYourA(temp.getYourA());
                            record.setId(System.currentTimeMillis());
                            record.setTestDate(DateUtils.getCurrentDate());
                            records.add(record);
                }
                // Save the test result
                Map params = new HashMap();
                params.put("type", "SAVETESTRESULT");
                params.put("results", records);
                super.iTran.process(params);
        }
}