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
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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0-255
????????if (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。
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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。
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图6-3-1 学生后台界面
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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")
????@ResponseBody
????public?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")
????@ResponseBody
????public 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"; }
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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";}
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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";
????????}}
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图6-8-1?学生查看课设信息界面
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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")
????@ResponseBody
????public 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")
????@ResponseBody
????public 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Id
????????????Student 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")
????@ResponseBody
????public 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")
????@ResponseBody
????public?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")
????@ResponseBody
????public?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?{
????@Override
????public?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;