Shulou(Shulou.com)06/03 Report--

这篇文章主要介绍了Java如何实现在线考试系统，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

学生模块功能比较少，就是进行考试和查看自己成绩两个大的功能。

学生进行考试的功能比较复杂（首先做了校验，不在考试时间范围内，不能进行考试）

考试试题是数据库根据发布考试时的条件随机产生的一套试题。因为每次考试题型题量都是不同的，因此我们继续采用JSON的格式去保存数据，当状态为1:表示正在考试;状态为2:表示已经考试结束;状态为3:表示老师已经阅完试卷

（1）当考试考试的时候，会给考上随机产生一套试题，并存储到数据库中，如果考试中电脑突然坏了可以保证重新打开还是之前的试题

（2）考试时间结束会自动提交考试，此时会将有学生成绩的试题保存到数据库中，老师批阅试卷就是从该JSON中读取出来的

（3）老师批阅完试卷以后，状态会变为3，JSON中会加上考生每道题的得分情况（考试倒计时根据考试考试时间和考试时间长度进行计算出来的，如果下午四点考试结束，学生三点半登录系统，就只有半个小时时间进行考试）

@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 publishexamList = publishExamService.selectAll(classesid, curr, 5);model.addAttribute("publishexamList", publishexamList);}model.addAttribute("studentInfo", student);return "/exam/list";}//进入考试页面，初始化数据@SuppressWarnings("unchecked")@RequestMapping("/exam")public String exam(HttpServletRequest request,int id,Model model){//0表示0.5小时，1表示1小时，2表示1.5小时，3表示2小时，4表示2.5小时，5表示3小时//考试时间所对应的毫秒数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");//在考试记录表中添加一条考试信息Examhis examhis = examhisService.studentIsNotExam(student.getId(), publishexam.getSubjectId(), publishexam.getExamtime());List textList = null;ArrayList 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()]);//当前时间如果在考试时间之前,考试还未开始if (date.compareTo(publishexam.getExamtime()) 考试时间+考试时长，考试已经结束 2.examhis=null，则证明作者第一次点击开始考试如果examhis不为空状态为1:表示正在考试状态为2:表示已经考试结束，状态为3:表示老师已经阅完试卷*/if (date.compareTo(date2) >= 0 || (examhis != null && examhis.getStatus() != 1)){model.addAttribute("message", "对不起当前考试已经结束!");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();for (TextModel textModel : list) {List 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 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";}//提交考试方法@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");//将考试信息转成json，改变考试状态，更新到考试历史记录表中Examhis examhis = examhisService.studentIsNotExam(student.getId(), publishexam.getSubjectId(), publishexam.getExamtime());List 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("您已成功提交考试");}

//JS实现倒计时，考试结束提交试卷 function startTime(){ //定义考试剩余时间，时间为毫秒数 //examTime = "${examTime}";//对考试剩余时间赋值 //var exam = parseInt("${examTime}"); var examTime = parseInt(examTimes[xss_clean]); var examTimeLength;//考试时长 examTimeLength = "${examTimeLength}"; if ((examTime)

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