Java如何實(shí)現在線(xiàn)考試系統

這篇文章主要介紹了Java如何實(shí)現在線(xiàn)考試系統，具有一定借鑒價(jià)值，感興趣的朋友可以參考下，希望大家閱讀完這篇文章之后大有收獲，下面讓小編帶著(zhù)大家一起了解一下。

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

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

考試試題是數據庫根據發(fā)布考試時(shí)的條件隨機產(chǎn)生的一套試題。因為每次考試題型題量都是不同的，因此我們繼續采用JSON的格式去保存數據，當狀態(tài)為1:表示正在考試；狀態(tài)為2:表示已經(jīng)考試結束；狀態(tài)為3:表示老師已經(jīng)閱完試卷

（1）當考試考試的時(shí)候，會(huì )給考上隨機產(chǎn)生一套試題，并存儲到數據庫中，如果考試中電腦突然壞了可以保證重新打開(kāi)還是之前的試題

（2）考試時(shí)間結束會(huì )自動(dòng)提交考試，此時(shí)會(huì )將有學(xué)生成績(jì)的試題保存到數據庫中，老師批閱試卷就是從該JSON中讀取出來(lái)的

（3）老師批閱完試卷以后，狀態(tài)會(huì )變?yōu)?，JSON中會(huì )加上考生每道題的得分情況（考試倒計時(shí)根據考試考試時(shí)間和考試時(shí)間長(cháng)度進(jìn)行計算出來(lái)的，如果下午四點(diǎn)考試結束，學(xué)生三點(diǎn)半登錄系統，就只有半個(gè)小時(shí)時(shí)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(yè)面，初始化數據@SuppressWarnings("unchecked")@RequestMapping("/exam")public String exam(HttpServletRequest request,int id,Model model){//0表示0.5小時(shí)，1表示1小時(shí)，2表示1.5小時(shí)，3表示2小時(shí)，4表示2.5小時(shí)，5表示3小時(shí)//考試時(shí)間所對應的毫秒數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()]);//當前時(shí)間如果在考試時(shí)間之前,考試還未開(kāi)始if (date.compareTo(publishexam.getExamtime()) <= 0){model.addAttribute("message", "對不起當前考試還未開(kāi)始!");return "/message";}/*1.當前時(shí)間>考試時(shí)間+考試時(shí)長(cháng)，考試已經(jīng)結束 2.examhis=null，則證明作者第一次點(diǎn)擊開(kāi)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", "對不起當前考試已經(jīng)結束!");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(shí)現倒計時(shí)，考試結束提交試卷 function startTime(){ //定義考試剩余時(shí)間，時(shí)間為毫秒數  //examTime = "${examTime}";//對考試剩余時(shí)間賦值 //var exam = parseInt("${examTime}"); var examTime = parseInt(examTimes.innerHTML); var examTimeLength;//考試時(shí)長(cháng) examTimeLength = "${examTimeLength}"; if ((examTime)<0){ alert("考試時(shí)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(kāi)始了" + lh + "時(shí)" + lm + "分" + ls + "秒" + ",剩余" + yh + "時(shí)" + ym + "分" + ys + "秒"; } examTime--; examTimes.innerHTML=examTime; setTimeout(startTime,1000); } var timer=null; //當頁(yè)面加載后，啟動(dòng)周期性定時(shí)器，每過(guò)1秒執行startTime window.onload=function(){ startTime(); } </script>

因為查詢(xún)成績(jì)比較簡(jiǎn)單，就是查詢(xún)出學(xué)生成績(jì)，顯示到頁(yè)面上而已，正在進(jìn)行的考試成績(jì)?yōu)榭铡?/p>