考试系统——考卷设计思路
表的设计。管理员是/login2.jsp登录。
根据paperId获取试卷题目，然后按题目类型放入不同的集合，便于再页面生成多选或者单选题。
public String getDetailPaper()throws Exception{ paper=paperDao.getPaper(paperId); Set<Question> questionList=paper.getQuestions(); Iterator<Question> it=questionList.iterator(); while(it.hasNext()){ Question q=it.next(); if("1".equals(q.getType())){//按题目类型放入不同的集合 squestionList.add(q); }else{ mquestionList.add(q); } } squestionList=this.getRandowQuestion(squestionList, 3);//随机选取题目 mquestionList=this.getRandowQuestion(mquestionList, 2); mainPage="exam/paper.jsp"; return SUCCESS; } /*随机选取题目,总共选N题，用for循环N次，如果题目重复，N-1补回一次*/ private List<Question> getRandowQuestion(List<Question> questionList,int num){ List<Question> resultList=new ArrayList<Question>(); Random random=new Random(); if(num>0){ for(int i=1;i<=num;i++){ int n=random.nextInt(questionList.size()); Question q=questionList.get(n); if(resultList.contains(q)){ i--; }else{ resultList.add(q); } } } return resultList; }
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> <script type="text/javascript"> var examTime=20*60; var useTime=0,remainTime=examTime; function showCount(){ if(remainTime==0){ document.getElementById("myForm").submit(); } useTime+=1; remainTime-=1; var hourU=Math.floor(useTime/3600); var minuteU=Math.floor((useTime-hourU*3600)/60); var secondU=Math.floor(useTime-hourU*3600-minuteU*60); document.getElementById("useTime").innerHTML=format(hourU)+":"+format(minuteU)+":"+format(secondU); var hourR=Math.floor(remainTime/3600); var minuteR=Math.floor((remainTime-hourR*3600)/60); var secondR=Math.floor(remainTime-hourR*3600-minuteR*60); document.getElementById("remainTime").innerHTML=format(hourR)+":"+format(minuteR)+":"+format(secondR); } function format(timeNumber){ if(timeNumber<10){ return "0"+timeNumber; }else{ return timeNumber; } } window.setInterval("showCount()", 1000); </script> </head> <body> <div class="data_list"> <div class="data_info"> <p> 考试时间：<strong>20分钟</strong> 计时： <font id="useTime" style="font-weight: bold;"></font> 剩余时间： <font id="remainTime" style="font-weight: bold;"></font></p> <hr/> <p class="examTitle">${paper.paperName} 考试卷</p> <p class="examScoreInfo">( 满分120 单选题60分 多选题60分 )</p> </div> <div class="data_exam_content"> <form id="myForm" action="exam!add" method="post"> <input type="hidden" name="exam.student.id" value="${currentUser.id }"/> <input type="hidden" name="exam.paper.id" value="${paper.id }"/> <strong><big>一，单选题</big></strong>(每题20分，答错不得分)<br/><br/> <c:forEach var="s" items="${squestionList}" varStatus="status"> <strong>[ ${status.index+1 } ] ${s.subject }</strong><br/><br/> <label class="radio"> <input type="radio" name="id-r-${s.id }" value="A"/> ${s.optionA } </label> <label class="radio"> <input type="radio" name="id-r-${s.id }" value="B"/> ${s.optionB } </label> <label class="radio"> <input type="radio" name="id-r-${s.id }" value="C"/> ${s.optionC } </label> <label class="radio"> <input type="radio" name="id-r-${s.id }" value="D"/> ${s.optionD } </label> <br/> </c:forEach> <br/> <strong><big>一，多选题</big></strong>(每题30分，答错不得分)<br/><br/> <c:forEach var="m" items="${mquestionList}" varStatus="status"> <strong>[ ${status.index+1 } ] ${m.subject }</strong><br/><br/> <label class="checkbox"> <input type="checkbox" name="id-c-${m.id }" value="A"/> ${m.optionA } </label> <label class="checkbox"> <input type="checkbox" name="id-c-${m.id }" value="B"/> ${m.optionB } </label> <label class="checkbox"> <input type="checkbox" name="id-c-${m.id }" value="C"/> ${m.optionC } </label> <label class="checkbox"> <input type="checkbox" name="id-c-${m.id }" value="D"/> ${m.optionD } </label> <br/> </c:forEach> <button class="btn btn-primary" type="submit">交卷</button> </form> </div> </div> </body> </html>
试卷提交，自动计算得分。单选题的<input type="radio" name="id-r-${s.id }" value="A"/>, 多选题的<input type="checkbox" name="id-c-${m.id }" value="A"/>
由于请求参数比较多，用Map<String, String[]> keyMap=request.getParameterMap()比较方便。
public String add()throws Exception{ Map<String, String[]> keyMap=request.getParameterMap(); Iterator<Entry<String,String[]>> it2=keyMap.entrySet().iterator(); int totalScore=0; int singleScore=0; int moreScore=0; while(it2.hasNext()){ Entry<String,String[]> entry=it2.next(); String keyStr=entry.getKey(); String values[]=entry.getValue(); String key; String value=""; if(keyStr.equals("exam.student.id")||keyStr.equals("exam.paper.id")){ continue; } if(keyStr.split("-")[1].equals("r")){ // 单选题目 key=keyStr.split("-")[2]; value=values[0]; singleScore+=this.calScore(key, value, "1"); }else{ // 多选 key=keyStr.split("-")[2]; for(String s:values){ value+=s+","; } value=value.substring(0, value.length()-1);//去掉最后一个， moreScore+=this.calScore(key, value, "2"); } } totalScore=singleScore+moreScore; exam.setSingleScore(singleScore); exam.setMoreScore(moreScore); exam.setScore(totalScore); exam.setExamDate(new Date()); examDao.saveExam(exam); mainPage="exam/examResult.jsp"; return SUCCESS; } /*不同题型使用不同的计分*/ private int calScore(String questionId,String userAnswer,String type)throws Exception{ Question question=questionDao.getQuestion(questionId); if(userAnswer.equals(question.getAnswer())){ if("1".equals(type)){ return 20; }else{ return 30; } }else{ return 0; } }
添加试卷信息比较简单，按如下表单填入数据，直接插入到数据表t_question。
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