Java实现在线考试系统（学生功能）

布满荆棘的人生 2022-05-18 00:48 284阅读 0赞

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）  
![这里写图片描述][70]

![这里写图片描述][70 1]  
**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）  
![这里写图片描述][70 2]

@InitBinder
    	public 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";
    	}
    	
    	//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<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()]);
    		//当前时间如果在考试时间之前,考试还未开始
    		if (date.compareTo(publishexam.getExamtime()) <= 0){
    			model.addAttribute("message", "对不起当前考试还未开始!");
    			return "/message";
    		}
    		
    		/*1.当前时间>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<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";
    	}
    	
    	//提交考试方法
    	@RequestMapping(value="/examEnd", method=RequestMethod.POST)
    	@ResponseBody
    	public 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<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("您已成功提交考试");
    	}

因为查询成绩比较简单，就是查询出学生成绩，显示到页面上而已，正在进行的考试成绩为空。  
![这里写图片描述][70 3]

[70]: /images/20220518/e4118188143141d785946e0ba0b89544.png
[70 1]: /images/20220518/1c777661a1e0454e80150c6bfb1d56d7.png
[70 2]: /images/20220518/9bed453f83234bfeb7e5f53cc5a97546.png
[70 3]: /images/20220518/6ae2a66f8f3046fcb5ad94b9a1fd4a4f.png