Java如何實現(xiàn)在線考試系統(tǒng)

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學(xué)生模塊功能比較少，就是進(jìn)行考試和查看自己成績兩個大的功能。

學(xué)生進(jìn)行考試的功能比較復(fù)雜（首先做了校驗，不在考試時間范圍內(nèi)，不能進(jìn)行考試）

考試試題是數(shù)據(jù)庫根據(jù)發(fā)布考試時的條件隨機(jī)產(chǎn)生的一套試題。因為每次考試題型題量都是不同的，因此我們繼續(xù)采用JSON的格式去保存數(shù)據(jù)，當(dāng)狀態(tài)為1:表示正在考試；狀態(tài)為2:表示已經(jīng)考試結(jié)束；狀態(tài)為3:表示老師已經(jīng)閱完試卷

（1）當(dāng)考試考試的時候，會給考上隨機(jī)產(chǎn)生一套試題，并存儲到數(shù)據(jù)庫中，如果考試中電腦突然壞了可以保證重新打開還是之前的試題

（2）考試時間結(jié)束會自動提交考試，此時會將有學(xué)生成績的試題保存到數(shù)據(jù)庫中，老師批閱試卷就是從該JSON中讀取出來的

（3）老師批閱完試卷以后，狀態(tài)會變?yōu)?，JSON中會加上考生每道題的得分情況（考試倒計時根據(jù)考試考試時間和考試時間長度進(jìn)行計算出來的，如果下午四點考試結(jié)束，學(xué)生三點半登錄系統(tǒng)，就只有半個小時時間進(jìn)行考試）

@InitBinderpublic void initBinder(WebDataBinder binder) {SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));}@RequestMapping("/list")public String showExam(HttpServletRequest request,Integer curr, Model model){if (curr == null){curr = 1;}HttpSession session = request.getSession();Student student = (Student) session.getAttribute("studentInfo");Integer classesid = student.getClassesid();if (classesid != null){PageInfo<Publishexam> publishexamList = publishExamService.selectAll(classesid, curr, 5);model.addAttribute("publishexamList", publishexamList);}model.addAttribute("studentInfo", student);return "/exam/list";}//進(jìn)入考試頁面，初始化數(shù)據(jù)@SuppressWarnings("unchecked")@RequestMapping("/exam")public String exam(HttpServletRequest request,int id,Model model){//0表示0.5小時，1表示1小時，2表示1.5小時，3表示2小時，4表示2.5小時，5表示3小時//考試時間所對應(yīng)的毫秒數(shù)long[] dateLong = {30*60*1000, 60*60*1000, 90*60*1000, 120*60*1000, 150*60*1000, 180*60*1000};PublishexamWithBLOBs publishexam = publishExamService.selectByKey(id);HttpSession session = request.getSession();Student student = (Student) session.getAttribute("studentInfo");//在考試記錄表中添加一條考試信息Examhis examhis = examhisService.studentIsNotExam(student.getId(), publishexam.getSubjectId(), publishexam.getExamtime());List<Text> textList = null;ArrayList<TextModel> list = JsonUtils.toBean(publishexam.getExam(), ArrayList.class, TextModel.class);Date date = new Date();Date date2 = new Date();date2.setTime(publishexam.getExamtime().getTime() + dateLong[publishexam.getExamlength()]);//當(dāng)前時間如果在考試時間之前,考試還未開始if (date.compareTo(publishexam.getExamtime()) <= 0){model.addAttribute("message", "對不起當(dāng)前考試還未開始!");return "/message";}/*1.當(dāng)前時間>考試時間+考試時長，考試已經(jīng)結(jié)束 2.examhis=null，則證明作者第一次點擊開始考試如果examhis不為空狀態(tài)為1:表示正在考試狀態(tài)為2:表示已經(jīng)考試結(jié)束，狀態(tài)為3:表示老師已經(jīng)閱完試卷*/if (date.compareTo(date2) >= 0 || (examhis != null && examhis.getStatus() != 1)){model.addAttribute("message", "對不起當(dāng)前考試已經(jīng)結(jié)束!");return "/message";}if (examhis == null){examhis = new Examhis();examhis.setStudentid(student.getId());examhis.setStudentname(student.getName());examhis.setSubjectid(publishexam.getSubjectId());examhis.setSubjectname(publishexam.getSubjectName());examhis.setClassesid(student.getClassesid());examhis.setClassesname(student.getClassesname());examhis.setPublishexamid(id);examhis.setExamtime(publishexam.getExamtime());examhis.setStatus(1);textList = new ArrayList<Text>();for (TextModel textModel : list) {List<Text> text = textService.beginExam(textModel,publishexam.getSubjectId());for (Text text2 : text) {text2.setTexId(textModel.getTextModelId());}textList.addAll(text);}String json = JsonUtils.toJson(textList);examhis.setExamtest(json);examhisService.insert(examhis);}else{textList = JsonUtils.toBean(examhis.getExamtest(), ArrayList.class, Text.class);}int sum = 0;for (TextModel textModel : list) {sum += textModel.getGrade()*textModel.getTextCount();}List<Textmodel> textModelList = textModelService.selectTextModel(list);model.addAttribute("textModelList", textModelList);model.addAttribute("studentInfo", student);model.addAttribute("textList", textList);model.addAttribute("publishexam", publishexam);model.addAttribute("sum", sum);model.addAttribute("examTimeLength", dateLong[publishexam.getExamlength()]/1000);model.addAttribute("examTime", (date2.getTime() - date.getTime())/1000);return "/exam/exam";}//提交考試方法@RequestMapping(value="/examEnd", method=RequestMethod.POST)@ResponseBodypublic AjaxResult examEnd(HttpServletRequest request, ExamList examList, int id){PublishexamWithBLOBs publishexam = publishExamService.selectByKey(id);HttpSession session = request.getSession();Student student = (Student) session.getAttribute("studentInfo");//將考試信息轉(zhuǎn)成json，改變考試狀態(tài)，更新到考試歷史記錄表中Examhis examhis = examhisService.studentIsNotExam(student.getId(), publishexam.getSubjectId(), publishexam.getExamtime());List<Exam> list = examList.getExamList();list.remove(0);for (Exam exam : list) {exam.setText(textService.selectOne(exam.getTextId()));if (exam.getAnswer() == null){exam.setAnswer(" ");}}String json = JsonUtils.toJson(list);examhis.setExamtest(json);examhis.setStatus(2);examhisService.update(examhis);return AjaxResult.successInstance("您已成功提交考試");}

<script type="text/javascript"> //JS實現(xiàn)倒計時，考試結(jié)束提交試卷 function startTime(){ //定義考試剩余時間，時間為毫秒數(shù)  //examTime = "${examTime}";//對考試剩余時間賦值 //var exam = parseInt("${examTime}"); var examTime = parseInt(examTimes.innerHTML); var examTimeLength;//考試時長 examTimeLength = "${examTimeLength}"; if ((examTime)<0){ alert("考試時間到!\n即將提交試卷!"); document.forms[0].submit(); }else{ //var lm = Math.floor((examTimeLength - examTime) / 60000); var lh = Math.floor(((examTimeLength - examTime) / 3600) % 60) var lm = Math.floor(((examTimeLength - examTime) / 60) % 60); var ls = (examTimeLength - examTime) % 60; var yh = Math.floor((examTime / 3600) % 60); var ym = Math.floor((examTime / 60) % 60); var ys = examTime % 60;  document.getElementById("tTime").innerHTML = "考試已經(jīng)開始了" + lh + "時" + lm + "分" + ls + "秒" + ",剩余" + yh + "時" + ym + "分" + ys + "秒"; } examTime--; examTimes.innerHTML=examTime; setTimeout(startTime,1000); } var timer=null; //當(dāng)頁面加載后，啟動周期性定時器，每過1秒執(zhí)行startTime window.onload=function(){ startTime(); } </script>

因為查詢成績比較簡單，就是查詢出學(xué)生成績，顯示到頁面上而已，正在進(jìn)行的考試成績?yōu)榭铡?/p>

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