SpringBoot + Servlet + Mybatis+ layui 学生选课管理系统

课程设计目的

本次课设做的系统为学生课程设计管理系统，鉴于学校规模的不断扩大，而且随着每年的扩招，人数不断的增加，每次课程设计都采用手工操作，费时费力。为了解决这个问题，决定做一个课程设计管理系统，对每个学期选修课程设计的学生基本情况作个统计。学生可以在系统中注册账号，登录后学生从该系统中选题，填写同组学生的姓名，组长等基本情况；查询自己的课程设计成绩，课程设计的选择情况，成绩的合格情况，小组成员信息，上课程设计报告的上传，下载，删除，预览等功能。老师通过该系统添加课设信息，查看学生的选题情况，给出学生的分数。这有利于老师教学，及时了解学生的情况，提高教学质量，减轻老师的工作量，改善原有的比较繁锁的工作。

题目基本情况

本系统涉及权限管理，以老师,学生分别登录以进行不同的操作，老师可以对查看学生信息，给出学生成绩查看学生选题情况，添加课设信息。学生可以添加同组成员信息选择课程设计，退掉课程设计，查看课程设计的成绩，上传实验报告.为了提高信息的处理效率，设计一款小型的课程设计管理系统。将数据库的内容通过web服务器配合前端框架在浏览器展现出来，达到直观，方便的管理目的。

数据库表设计

教师属性：教师号，姓名，职称，密码。

学生属性：学号，姓名，班级，密码。

题目属性：课题号，课题目名称，题目信息，教工号。

选题属性：学号，题号，成绩，组号。

小组属性：组号，组员，组长。

文件属性：文件号，文件名，后缀，路径大小，类型，下载次数，上传时间，学号

技术栈

数据库连接池技术 maven工具 servlet技术

Ajax请求 Spring-Boot框架 Mybatis框架 JSON数据格式

commons-fileupload组件 layui框架

程序流程图

5.3.1登录操作

本程序设计的权限管理中，不同身份可以进行的操作不一样，因此不同的身份，决定执行什么样的操作，如图6-1所示为教师登录验证界面，前端使用leyui框架布局，

验证码使用BufferedImage类绘制，用户输入信息后进行后台的逻辑判断，成功则进入到后台管理界面。若用户名和姓名和验证码输入正确，则跳转到对应的请求映射，若勾选记住密码，则会在信息全部正确匹配后将正确的信息存入cookie，若其中一项输入错误，则会重新定向到登录界面。

图6-1教师登录界面

图6-2学生登录界面

登录部分代码:

Dao层：@Select("SELECT * from student where stdname =#{stdname} and stdpassword =#{stdpassword}")public Student findstudentByNameAndPassword(Student student);//通过用户的姓名和密码查询Controller层：@RequestMapping("/tologin")public String index() {return "login";}//登录1@RequestMapping(value = "/login")public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response, Student student) throws Exception {String name = request.getParameter("stdname");String pwd = request.getParameter("stdpassword");String yzm = request.getParameter("captcha");String shenfen = request.getParameter("shenfen");HttpSession session = request.getSession();String code = (String) session.getAttribute("code");String rember = request.getParameter("rememberMe");//3.处理跳转//创建ModelAndView对象ModelAndView mav = new ModelAndView();if (yzm.equals(code)) {Student student_find = studentService.login(student);System.out.println(student_find);if (student_find != null) {//1.办卡String cusername = java.net.URLEncoder.encode(name, "utf-8");Cookie cookie1 = new Cookie("uname", cusername);Cookie cookie2 = new Cookie("passwd", pwd);//3.设置范围/* cookie1.setPath("/mydemo3/");cookie2.setPath("/mydemo3/");*/if ("true".equals(rember)) {//2.设置时效(一次浏览器的关闭)cookie1.setMaxAge(60 * 60 * 24 * 10);cookie2.setMaxAge(60 * 60 * 24 * 10);} else {cookie1.setMaxAge(0);cookie2.setMaxAge(0);}//4.给客户response.addCookie(cookie1);response.addCookie(cookie2);//向模型对象中添加数据mav.addObject("student", student_find);session.setAttribute("stulogin", student_find);session.setAttribute("studentname", student.getStdname());session.setAttribute("stdpwd", student.getStdpassword());//设置逻辑视图名mav.setViewName("studentstage");//返回ModelAndView对象return mav;} else {mav.addObject("name", "请重新登录！");//设置逻辑视图名mav.setViewName("login");//返回ModelAndView对象return mav;}} else {mav.setViewName("login");}return mav;}验证码：public class CaptcahCode {public static String drawImageVerificate(HttpServletResponse response) {//定义验证码的宽度和高度int width = 120;int height = 25;//在内存中创建图片BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);//创建图片上下文Graphics2D g = image.createGraphics();//产生随机对象，此随机对象主要用于算术表达式的数字Random random = new Random();//设置背景g.setColor(getRandomColor(240, 250));//设置字体g.setFont(new Font("微软雅黑", Font.PLAIN, 22));//开始绘制g.fillRect(0, 0, width, height);//干扰线的绘制，绘制干扰线到图片中g.setColor(getRandomColor(180, 230));for (int i = 0; i < 100; i++) {int x = random.nextInt(width);int y = random.nextInt(height);int x1 = random.nextInt(60);int y1 = random.nextInt(60);g.drawLine(x, y, x1, y1);}//开始进行对算术验证码表达式的拼接int num1 = (int) (Math.random() * 10 + 1);int num2 = (int) (Math.random() * 10 + 1);int fuhao = random.nextInt(3);//产生一个0-2之间的随机整数//记录符号String fuhaostr = null;int result = 0;switch (fuhao) {case 0:fuhaostr = "+";result = num1 + num2;break;case 1:fuhaostr = "-";result = num1 - num2;break;case 2:fuhaostr = "*";result = num1 * num2;break;}//拼接算术表达式，用户图片显示String calc = num1 + " " + fuhaostr + " " + num2 + " = ?";//设置随机颜色g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));//绘制表达式g.drawString(calc, 5, 25);//结束绘制try {//输出图片到页面ImageIO.write(image, "jpg", response.getOutputStream());return String.valueOf(result);} catch (Exception e) {e.printStackTrace();return null;}}public static Color getRandomColor(int fc, int bc) {//利用随机数Random random = new Random();//随机颜色，了解颜色-Color(red,green,blue).rgb三元色0-255if (fc > 255) fc = 255;if (bc > 255) bc = 255;int r = fc + random.nextInt(bc - fc);int g = fc + random.nextInt(bc - fc);int b = fc + random.nextInt(bc - fc);return new Color(r, g, b);}}

5.3.2注册操作

本程序设计的权限管理中，支持学生的注册账号功能。若点击注册，则进行注册的映射请求，输入对应信息，进行注册，所示选项全部为必填项，否则无法进行注册，两次输入密码会进行判断，不同则注册失败。输入的学号会事先判断是否已经存在，存在则返回已存在。

图6-3注册界面

注册部分代码

Dao层：@Insert("insert into student(stdid, stdname, stdpassword, stdclass) value(#{stdid}, #{stdname}, #{stdpassword},#{stdclass})")public int insertStudent(Student student);//注册用户@Select("SELECT COUNT(stdid) from student where stdid=#{stdid}")public int findStudentExist(String stdid);//用户id查看是否已经存在Controller层://注册页面显示@RequestMapping("/register")public String registerUser() {return "register";}//注册功能实现@RequestMapping(value = "/registerStudent", method = RequestMethod.POST)public String registerUser(Student student, HttpServletRequest request) throws Exception {if (!studentService.findStudentExist(student.getStdid())) {request.setAttribute("error", "用户ID已经存在！");request.setAttribute("stdid", student.getStdid());request.setAttribute("stdname", student.getStdname());request.setAttribute("stdpassword", student.getStdpassword());request.setAttribute("stdclass", student.getStdclass());return "register";} else {studentService.register(student);}return "tips";}

5.3.3后台选择操作

学生登录完毕后，将会进入图6-3-1所示的学生界面，学生可以查看个人信息，查看选课信息以及退课，修改密码，查询课设信息以及选课，成绩查询和报告的上传，下载，预览和删除；教师登录完毕后，将会进入图6-3-2所示的教师界面，教师可以查看个人信息，查看自己的开课信息以及加课，修改密码，查询学生选择课程的信息以及给出学生成绩。

图6-3-1 学生后台界面

图6-3-2教师后台界面

5.3.4个人中心界面

点击个人中心的下拉框后，进入如图6-4-1的界面，通过session取出在登录时存入的姓名密码等信息，将查到的信息返回到前端界面进行展示。用户可以点击小眼睛查看自己的密码。

关键代码：

Dao层：@Select("SELECT * FROM `student`where stdname =#{stdname}")public Student findStudentByName(String stdname) throws IOException;//根据用户id查找用户Controller层：@RequestMapping("udentcenter")public String center(HttpSession session) throws IOException {String stdname = (String) session.getAttribute("studentname");Student student = studentService.findStudentByName(stdname);session.setAttribute("stu", student);return "studentcenter";
}

图6-4学生个人中心界面

5.3.5学生课设中心界面

点击课设中心下拉框，请求映射到对应的地址，通过登录时存放的session，取出登录用户的id，调用service层函数，service层调用dao层的函数，操作数据库取出所需的值，并存放在list集合中，返回该页面。对于还没出成绩的课程，学生有权选择推掉这门课设。同时点击课设名可以查看课设的详细信息，点击组号可以查看小组的详细信息。

主要代码：

Dao层：@Select("SELECTquesion.queid,quesion.quename,teacher.teaname,choque.gruid,choque.score from quesion,teacher,choque\n" +"where quesion.queid = choque.queid  and teacher.teaid = quesion.teaid and choque.stdid = #{stdid}")public List<ChooseCourseInfo> findChooseCourseInfo(String stdid);@Select("SELECT queid,quename,quemess FROM quesion where queid = #{queid}")public Quesion showcourse(String queid);@Select("SELECT `group`.grubody ,`group`.gruhead from `group` where gruid =#{gruid}")public Group showgroup(String gruid);Controller层：@RequestMapping("dcourse")public String stdcourse(HttpSession session, Model model) throws IOException {Student stu = (Student) session.getAttribute("stulogin");List<CourseInfo> courseInfos = studentService.findCourseInfo(stu.getStdid());model.addAttribute("courseinfos", courseInfos);return "stdcourse";}@RequestMapping("owcourse")public String showcourse(String queid, Model model) throws IOException {Quesion quesion = studentService.showcourse(queid);model.addAttribute("quesion", quesion);return "showcourse";}@RequestMapping("owgroup")public String showgroup(String gruid, Model model) throws IOException {Group group = studentService.showgroup(gruid);model.addAttribute("group", group);return "showgroup";}

图6-5学生课设中心界面

5.3.6教师课设中心界面

点击课设中心下拉框，请求映射到对应的地址，通过登录时存放的session，取出登录用户的id，调用service层函数，service层调用dao层的函数，操作数据库取出所需的值，并存放在list集合中，返回该页面，教师还可以对已经添加的课设进行删除，也可以通过点击添加课程设计按钮，输入信息后，添加新的课程设计。

主要代码：

Dao层：@Select("select quesion.queid,quesion.quename,\n" +"(select COUNT(*) from choque where choque.queid = quesion.queid) as stucount, \n" +"(SELECT COUNT(*) FROM choque where choque.queid = quesion.queid and choque.score<60) as passfail\n" +"FROM quesion WHERE teaid = #{teaid}")public List<TeacherCourse> findteachercourse(String teaid);@Insert("insert into quesion (queid, quename, quemess, teaid) VALUES (#{queid},#{quename},#{quemess},#{teaid}) ")@Delete("delete from quesion where queid= #{queid}")public void dlelete(String queid);public void insertteacourse(Quesion quesion);Controller层：@GetMapping("/topasscourse")public String topasscourse() {return "teachercourse";}@GetMapping("owcourse")@ResponseBodypublic Map<String, Object> coursecenter(HttpSession session,HttpServletRequest request) throws IOException {
Teacher teacher = (Teacher) session.getAttribute("tealogin");
List<TeacherCourse> teacherCourses = teacherService.FindTeacherCourse(teacher.getTeaid());Map<String, Object> res = new HashMap<>();res.put("code", 0);res.put("data", teacherCourses);return res;}@RequestMapping("/toaddcourse")public String toaddcou() {return "addteacourse";}@RequestMapping("/addteachercourse")@ResponseBodypublic Map<String, String> addcourse(Model model, HttpServletRequest request, Quesion quesion, HttpSession session) throws IOException {Teacher teacher = (Teacher) session.getAttribute("tealogin");System.out.println(quesion);Map<String, String> res = new HashMap<>();if (!teacherService.findqueexist(quesion.getQueid())) {res.put("code","200");res.put("msg", "课号已存在，不能重复添加");}else{quesion.setTeaid(teacher.getTeaid());teacherService.insertteacourse(quesion);res.put("code", "0");res.put("msg", "添加成功");}return res;}@RequestMapping("/delcourse")public String delcourse(String gruid) throws IOException {studentService.delcourse(gruid);return "redirect:coursecenter"; }

图6-6学生课设中心界面

5.3.7修改密码界面

点击修改密码下拉框，请求映射到对应的地址，通过登录时存放的session，取出登录用户的id，调用service层函数，service层调用dao层的函数，通过传入的参数进行对学生信息的更新，页面部分，系统会对输入的信息进行判断，包括原密码和新密码，判断原密码是否正确，判断两次输入的密码是否一致。

关键代码：

Dao层@Update("UPDATE student set stdpassword = #{stdpassword} where stdid = #{stdid}")public int updatestudent(Student student);Controller层@RequestMapping("/pass")public String pass() {return "studentpass";}@RequestMapping("/topass")public String topass(String stdpassword, HttpSession session) throws IOException {Student stu = (Student) session.getAttribute("stulogin");String stdid = stu.getStdid();System.out.println(stdid + " " + stdpassword);Student studd = new Student();studd.setStdid(stdid);studd.setStdpassword(stdpassword);studentService.updateStudent(studd);return "redirect:tologin";}

图6-7管理员修改界面

5.3.8选课查询界面

点击选课查询下拉框，请求映射到对应的地址，通过映射到JSP界面后，JSP界面通过Ajax异步请求，访问映射地址，通过通过自定义的Json类将数据通过Json数据格式返回到JSP界面，以leyui渲染的数据表格形式展现出来。用户可以对查出来的课设信息进行选择，填写同组成员信息后，将该课程设计加入到自己的课设中心。系统还会判断收入的组号是不是已经存在，存在则返回改界面。

主要代码：

Dao层：@Select("select * from quesion limit #{page},#{size}")public List<Quesion> FindQuesionByPage(Map<String, Object> params);//分页查询用户@Select("select count(gruid) from  `group` where gruid =#{gruid}")public int findGroupExist(String gruid);@Insert("insert into `group`(gruid, grubody, gruhead) VALUES (#{gruid},#{grubody},#{gruhead})")public int addgroup(Group group);@Insert("insert into choque(stdid, queid, gruid) VALUES (#{stdid},#{queid},#{gruid})")public int addchoque(Choque choque);@Select("SELECT COUNT(*) FROM quesion")public int count() throws SQLException;//查询用户总数Controller层：@RequestMapping(value = "/findquesionPage", method = RequestMethod.GET)public void findStudentPage(Quesion quesion, HttpServletRequest request, HttpServletResponse response) throws Exception {request.setCharacterEncoding("utf-8");response.setContentType("application/json;charset=UTF-8");//设置编码，防止json中文乱码int index = 1;String sindex = request.getParameter("page");if (sindex != null && !"".equals(sindex)) {index = Integer.parseInt(sindex);}int size = 5;String ssize = request.getParameter("limit");if (ssize != null && !"".equals(ssize)) {size = Integer.parseInt(ssize);}PageBean<Quesion> pageBean = new PageBean<Quesion>();pageBean.setLimit(size);pageBean.setPage(index);System.out.println(pageBean.getLimit());try {pageBean = studentService.FindQuesionByPage(index, size);} catch (IOException | SQLException e) {e.printStackTrace();}JsonResult<Quesion> jr = new JsonResult<Quesion>("0", "", String.valueOf(pageBean.getTotalCount()), pageBean.getList());//交互json格式所需的对象String jsonStr = JSON.toJSONString(jr);//将JsonResult对象转换为json串PrintWriter out = response.getWriter();out.print(jsonStr);out.close();}@RequestMapping("/toaddcourse")public String addcoursejsp(String queid, Model model, HttpSession session) throws IOException {Student stud = (Student) session.getAttribute("stulogin");model.addAttribute("stqueid", queid);model.addAttribute("ststdid", stud.getStdid());return "addcourses";}@RequestMapping("/addinfo")public String addgroup(Model model, HttpServletRequest request, Group group, HttpSession session) throws IOException {String stdid = request.getParameter("stdid");String queid = request.getParameter("queid");System.out.println(stdid +" " + queid);if (!studentService.findGroupExist(group.getGruid())) {Student stud = (Student) session.getAttribute("stulogin");model.addAttribute("stqueid", queid);model.addAttribute("ststdid", stud.getStdid());request.setAttribute("gruid", "该组号已经存在");request.setAttribute("grubody", group.getGrubody());request.setAttribute("gruhead", group.getGruhead());return "addcourses";} else {Choque choque = new Choque();choque.setStdid(stdid);choque.setGruid(group.getGruid());choque.setQueid(queid);studentService.addgroup(group);studentService.addchoque(choque);return "tips";}}

图6-8-1 学生查看课设信息界面

图6-8-2学生填写同组信息添加课设界面

5.3.9成绩查询界面

点击成绩查询下拉框，请求映射到对应的地址，获取session中的用户id后，调用service层的函数，在调用dao层的函数，通过数据库查到的信息，封装在一个list集合中返回到jsp界面。

主要代码：

Dao层：@Select("SELECT quesion.queid,quesion.quename,teaname,score from quesion,teacher,choque \n" +"where quesion.queid=choque.queid and quesion.teaid = teacher.teaid and choque.stdid = #{stdid}")public List<CourseInfo> findCourseInfo(String stdid);Controller层：@RequestMapping("dcourse")public String stdcourse(HttpSession session, Model model) throws IOException {Student stu = (Student) session.getAttribute("stulogin");List<CourseInfo> courseInfos = studentService.findCourseInfo(stu.getStdid());model.addAttribute("courseinfos", courseInfos);return "stdcourse";}

图6-9成绩查询界面

5.3.10文件上传操作

用户点击文件上传按钮后，请求映射到对应的地址，通过异步Ajax请求，通过session中的id值，调用service层和dao层函数，查询该用户上传的全部文件，封账成一个list集合，最后封装成Map映射，返回的jsp界面，通过layui table对于表格的渲染，展示数据。

主要代码：

Dao层：@Select("SELECT * FROM `files` where files.stdid= #{stdid} order by files.stdid limit #{begin}, #{offset}")public List<UserFile> queryByUserId (@Param("stdid") String stdid , @Param("begin") Integer begin , @Param("offset") Integer offset);@Select("SELECT COUNT(files.stdid) FROM files where files.stdid = #{stdid}")public int queryFileCounts(String stdid);@Insert("insert into files(filename, ext, path, size, type, downcount, uploadtime, stdid)\n" +" VALUES (#{filename},#{ext},#{path},#{size},#{type},#{downcount},#{uploadtime},#{stdid});")public  void savefile(UserFile userFile);@Delete(" delete from files where fileid=#{fileid}")public void delete(Integer fileid);@Select("select * FROM files where fileid =#{fileid}")public UserFile queryByUserFileId(Integer fileid);@Update("update files set downcount = #{downcount} where fileid = #{fileid}")public int updateflie(UserFile userFile);Controller层：// 展示所有的文件@GetMapping("/index")public String fileIndex() {return "filelist";}@PostMapping("showfiles")@ResponseBodypublic Map<String, Object> queryAllFile(HttpSession session, HttpServletRequest request) {int page = Integer.parseInt(request.getParameter("page"));int limit = Integer.parseInt(request.getParameter("limit"));Student student = (Student) session.getAttribute("stulogin");List<UserFile> userFiles = userFileService.queryByUserId(student.getStdid(), page, limit);Map<String, Object> res = new HashMap<>();res.put("code", 0);res.put("count", userFileService.queryFileCounts(student.getStdid()));res.put("data", userFiles);return res;}// 上传文件到数据库@PostMapping("upload")@ResponseBodypublic Map<String, String> uploadFile(@RequestParam("file") MultipartFile file, HttpSession session) {System.out.println("uploadFile trigger");Map<String, String> res = new HashMap<>();try {// 获取上传用户的IdStudent student = (Student) session.getAttribute("stulogin");// 获取文件的原始名称String fileName = file.getOriginalFilename();// 获取文件的后缀String extension = FilenameUtils.getExtension(file.getOriginalFilename());// 获取文件的大小long size = file.getSize();// 获取文件的类型String type = file.getContentType();// 根据日期动态的生成目录String localContainer = "/fileContainer";String uploadPath = ResourceUtils.getURL("classpath").getPath() + localContainer;String dateFormat = new SimpleDateFormat("yyyy-MM-dd").format(new Date());File dateDirPath = new File(uploadPath + File.separator + dateFormat);if (!dateDirPath.exists()) {dateDirPath.mkdirs();}// 处理文件上传file.transferTo(new File(dateDirPath, fileName));// 将文件信息存入数据库中UserFile userFile = new UserFile();userFile.setFilename(fileName);userFile.setExt('.' + extension);userFile.setPath(Paths.get(localContainer, dateFormat, fileName).toString());userFile.setSize(size);userFile.setType(type);userFile.setStdid(student.getStdid());userFileService.save(userFile);res.put("code", "0");res.put("msg", "上传成功");res.put("url", "index");} catch (IOException e) {e.printStackTrace();res.put("code", "-1");res.put("msg", "上传失败");res.put("url", "index");}return res;}@GetMapping("delete")@ResponseBodypublic Map<String, Object> delete(Integer fileid) {//@PathVariable:接收请求路径中占位符的值Map<String, Object> map = new HashMap<>();try {UserFile fileInfo = userFileService.queryByUserFileId(fileid);final String realPath = ResourceUtils.getURL("classpath").getPath() + fileInfo.getPath();File file = new File(realPath);if (file.exists()) {file.delete();  //立即删除}userFileService.delete(fileid);map.put("code", 0);map.put("msg", "删除成功！");} catch (FileNotFoundException e) {e.printStackTrace();map.put("code", -1);map.put("msg", "删除成功！");}return map;}public void getFile(String openStyle, Integer fileid, HttpServletResponse response) throws IOException {UserFile file = userFileService.queryByUserFileId(fileid);if(openStyle.equals("inline")){// 获取文件信息final String realPath = ResourceUtils.getURL("classpath").getPath() + file.getPath();// 获取文件输入流FileInputStream is = new FileInputStream(new File(realPath));// 附件下载response.setHeader("content-disposition", openStyle+";filename=" + URLEncoder.encode(file.getFilename(), "UTF-8"));// 获取响应response输出流ServletOutputStream os = response.getOutputStream();// 文件拷贝IOUtils.copy(is, os);IOUtils.closeQuietly(is);IOUtils.closeQuietly(os);}// 更新下载次数if(openStyle.equals("attachment")){file.setDowncount(file.getDowncount() + 1);userFileService.update(file);}}@GetMapping("preview")public void preview(Integer fileid, HttpServletResponse response) throws IOException {String openStyle = "inline";getFile(openStyle,fileid,response);}@GetMapping("download")public void download( Integer fileid, HttpServletResponse response){String openStyle = "attachment";try{getFile(openStyle,fileid,response);} catch (IOException e) {e.printStackTrace();}}

图6-10-1文件界面

图6-10-2文件上传界面

图6-10-3文件预览界面

5.3.10教师端信息查询

老师点击信息查询后，在session中获取老师的信息，传入controller层中，调用service和dao层函数，将得到的结果以封装到list集合，将集合和一些其他信息一同封装到map集合中，通过json串的形式一同传回jsp界面，通过leyui table表格渲染展示。教师也可以对选择了该课设的学生给出成绩，也可以修改成绩，方法类似，这里不再赘述。

主要代码：

Dao层：@Select("SELECT student.stdid,student.stdname,quesion.queid,quesion.quename,choque.score\n" +"FROM student,choque,quesion\n" +"WHERE student.stdid = choque.stdid AND choque.queid = quesion.queid AND quesion.teaid = #{teaid}")public List<Studentlist> showstudent(String teaid);@Update("UPDATE choque SET score = #{score} WHERE stdid = #{stdid} AND queid = #{queid}")public void upscore(Studentlist studentlist);Controller层：@RequestMapping("owstudents")@ResponseBodypublic Map<String, Object> showstudent(HttpSession session, Model model) throws IOException {Teacher teacher = (Teacher) session.getAttribute("tealogin");List<Studentlist> studentlists = teacherService.showstudent(teacher.getTeaid());Map<String, Object> res = new HashMap<>();res.put("code", 0);res.put("data", studentlists);return res; }@RequestMapping("/addscore")@ResponseBodypublic Map<String, Object> addscore(HttpSession session, Studentlist studentlist) throws IOException {teacherService.addscore(studentlist);Map<String, Object> res = new HashMap<>();res.put("code", 0);res.put("msg", "添加成功！");return res;}

图6-11教师端信息查询界面

图6-12教师端条件查询界面

5.3.11拦截器操作

登录拦截器，默认拦截/student 路径下的所有请求，若session中存在student，则放行，如不存在则跳转到登录界面。

public class LoginConfig implements WebMvcConfigurer {@Overridepublic void addInterceptors(InterceptorRegistry registry) {//注册TestInterceptor拦截器InterceptorRegistration registration = registry.addInterceptor(new LoginInterceptor());registration.addPathPatterns("/student/*");registration.excludePathPatterns("udent/tologin","udent/register","udent/registerStudent","udent/login","udent/code","/css/**","/images/**","/imagess/**","/js/**","/lib/**" );}}@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println("====================拦截前=================");
HttpSession session = request.getSession();
Student user = (Student) session.getAttribute("stulogin");
if (user != null) {
System.out.println("====================用户已登录================="+user.toString());
return true;}
if (!request.getContextPath().equals(request.getContextPath() + "student/tologin")) {response.sendRedirect(request.getContextPath() + "udent/tologin");}return false;

项目完整源码+说明书+软件说明+数据库表设计：

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