1. System introduction
1. Development environment
Development tool: IDEA2018
JDK version: jdk1.8
Mysql version: 8.0.13
2. Technical selection
Java+Servlet+Boostrap+Jsp+Mysql
3. System function
1. User registration and login system;
2. Administrators review users, check course selection, enable sign-in, delete courses, and change passwords;
3. Teachers create courses, view members, enable sign-in, delete courses, and change passwords;
4. Students choose courses, withdraw courses, and change passwords;
4. Database file
/*
Navicat Premium Data Transfer
Source Server : MYSQL
Source Server Type : MySQL
Source Server Version : 80013
Source Host : localhost:3306
Source Schema : servlet_select_course
Target Server Type : MySQL
Target Server Version : 80013
File Encoding : 65001
Date: 24/12/2021 16:58:38
*/
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for tb_courses
-- ----------------------------
DROP TABLE IF EXISTS `tb_courses`;
CREATE TABLE `tb_courses` (
`course_id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`teach_id` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`day` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`is_signin` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`member_num` int(11) NULL DEFAULT NULL,
PRIMARY KEY (`course_id`) USING BTREE,
INDEX `C_FK`(`teach_id`) USING BTREE,
CONSTRAINT `C_FK` FOREIGN KEY (`teach_id`) REFERENCES `tb_users` (`user_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE = InnoDB AUTO_INCREMENT = 29 CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_courses
-- ----------------------------
INSERT INTO `tb_courses` VALUES (27, '软件工程', '101', '星期一, 1 - 2 节', 'false', 1);
INSERT INTO `tb_courses` VALUES (28, '计算机导论', '104', '星期二, 3 - 4 节', 'false', 0);
-- ----------------------------
-- Table structure for tb_join
-- ----------------------------
DROP TABLE IF EXISTS `tb_join`;
CREATE TABLE `tb_join` (
`course_id` int(11) NULL DEFAULT NULL,
`stu_id` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`checked` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_join
-- ----------------------------
INSERT INTO `tb_join` VALUES (27, '1001', 'true');
INSERT INTO `tb_join` VALUES (28, '1001', 'checking');
-- ----------------------------
-- Table structure for tb_signin
-- ----------------------------
DROP TABLE IF EXISTS `tb_signin`;
CREATE TABLE `tb_signin` (
`signin_id` int(11) NOT NULL AUTO_INCREMENT,
`course_id` int(11) NULL DEFAULT NULL,
`time` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`signin_num` int(11) NULL DEFAULT NULL,
`end_time` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
PRIMARY KEY (`signin_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 25 CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_signin
-- ----------------------------
INSERT INTO `tb_signin` VALUES (24, 27, '2021-12-20 15:15:48', 1, '2021-12-20 15:16:16');
-- ----------------------------
-- Table structure for tb_signin_stu
-- ----------------------------
DROP TABLE IF EXISTS `tb_signin_stu`;
CREATE TABLE `tb_signin_stu` (
`signin_id` int(11) NULL DEFAULT NULL,
`stu_id` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`state` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_signin_stu
-- ----------------------------
INSERT INTO `tb_signin_stu` VALUES (24, '1001', 'true');
-- ----------------------------
-- Table structure for tb_users
-- ----------------------------
DROP TABLE IF EXISTS `tb_users`;
CREATE TABLE `tb_users` (
`user_id` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
`password` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`name` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`type` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
`checked` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL DEFAULT NULL,
PRIMARY KEY (`user_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of tb_users
-- ----------------------------
INSERT INTO `tb_users` VALUES ('1001', '123456', '同学1', 'stu', 'true');
INSERT INTO `tb_users` VALUES ('1002', '123456', '同学2', 'stu', 'true');
INSERT INTO `tb_users` VALUES ('101', '123456', '教师1', 'teach', 'true');
INSERT INTO `tb_users` VALUES ('102', '123456', '教师2', 'teach', 'true');
INSERT INTO `tb_users` VALUES ('103', '123456', '教师3', 'teach', 'true');
INSERT INTO `tb_users` VALUES ('104', '123456', '王老师', 'teach', 'true');
INSERT INTO `tb_users` VALUES ('105', '123456', '李老师', 'teach', 'false');
INSERT INTO `tb_users` VALUES ('admin', 'admin', '管理员', 'admin', 'true');
SET FOREIGN_KEY_CHECKS = 1;
2. System display
1. Log in to the system
2. Registration system
3. Admin - Home
4. Admin - manage users
5. Admin - Manage Courses
6. Administrator - change password
7. Teacher - Create a Course
8. Teacher - My Course
9. Teacher - change password
10. Students - join a course
11. Student - My Course
12. Student - change password
3. Part of the code
CreateCourseAction
package com.sjsq.servlet;
import com.sjsq.bean.Course;
import com.sjsq.bean.User;
import com.sjsq.dao.CourseDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet("/CreateCourseAction")
@MultipartConfig
public class CreateCourseAction extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doGet(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String courseName = req.getParameter("courseName");
String day = req.getParameter("day");
String courseTime = req.getParameter("courseTime");
String Day = day + ", " + courseTime;
User user = (User) req.getSession().getAttribute("User");
String teach_id = user.getId();
Course course = new Course(0, courseName, teach_id, Day, "false", 0);
CourseDao courseDao = new CourseDao();
int result = courseDao.Create(course);
if (result == 0) {
out.println("<script> alert('创建课程失败'); location='teacher_create.jsp'; </script>");
} else if (result == 1) {
out.println("<script> alert('创建课程成功'); location='teacher_create.jsp'; </script>");
} else {
out.println("<script> alert('上课时间冲突'); location='teacher_create.jsp'; </script>");
}
}
}
DeleteAction
package com.sjsq.servlet;
import com.sjsq.dao.CourseDao;
import com.sjsq.dao.JoinDao;
import com.sjsq.dao.UserDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
@WebServlet("/DeleteAction")
@MultipartConfig
public class DeleteAction extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String ope = req.getParameter("ope");
if (ope.equals("userdel")) {
// 删除用户
String user_id = req.getParameter("user_id");
UserDao userDao = new UserDao();
if (userDao.DelUser(user_id) == 1) {
out.println("<script> alert('删除成功'); location='toaudit.jsp'; </script>");
} else {
out.println("<script> alert('删除失败'); location='toaudit.jsp'; </script>");
}
} else if (ope.equals("useradd")) {
// 用户审核
String user_id = req.getParameter("user_id");
UserDao userDao = new UserDao();
try {
if (userDao.Check(user_id) == 1) {
out.println("<script> alert('审核通过'); location='toaudit.jsp'; </script>");
} else {
out.println("<script> alert('操作失败'); location='toaudit.jsp'; </script>");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
out.println("<script> alert('操作失败'); location='toaudit.jsp'; </script>");
}
} else if (ope.equals("coursedel")) {
// 课程删除
String c = req.getParameter("course_id");
String type = req.getParameter("type");
int course_id = Integer.valueOf(c);
CourseDao courseDao = new CourseDao();
if (courseDao.DelCourse(course_id) == 1) {
if (type.equals("admin")) {
out.println("<script> alert('课程删除成功'); location='show_all_courses.jsp'; </script>");
} else {
out.println("<script> alert('课程删除成功'); location='my_courses.jsp'; </script>");
}
} else {
if (type.equals("admin")) {
out.println("<script> alert('课程删除失败'); location='show_all_courses.jsp'; </script>");
} else {
out.println("<script> alert('课程删除失败'); location='my_courses.jsp'; </script>");
}
}
} else if (ope.equals("joindel")) {
// 退出选课
String c = req.getParameter("course_id");
String user_id = req.getParameter("user_id");
int course_id = Integer.valueOf(c);
String from_ = req.getParameter("from_");
JoinDao joinDao = new JoinDao();
if (joinDao.Delete(course_id, user_id) == 1) {
out.println("<script> alert('退出成功'); location='" + from_ + "'; </script>");
} else {
out.println("<script> alert('退出失败'); location='" + from_ + "'; </script>");
}
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doPost(req, resp);
}
}
LoginAction
package com.sjsq.servlet;
import com.sjsq.bean.User;
import com.sjsq.dao.UserDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
@WebServlet("/LoginAction")
@MultipartConfig
public class LoginAction extends HttpServlet {
private static final long serialVersionUID = 1L;
public LoginAction() {
super();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.sendRedirect("login.jsp");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String user_id = req.getParameter("inputUser_id"); // 从name属性中获取
String userPass = req.getParameter("inputPassword");
User user = new User();
user.setId(user_id);
user.setPassword(userPass);
UserDao userDao = new UserDao();
User user2;
try {
user2 = userDao.Query(user);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
out.println("<script> alert('登陆失败'); location='login.jsp'; </script>");
return;
}
if ((user2.getId()).equals("")) {
// 用户不存在
out.println("<script> alert('用户不存在'); location='login.jsp'; </script>");
} else if (user2.getPassword().equals(userPass)) {
// 登陆成功
req.getSession(true).setAttribute("User", user2);
out.println("<script> alert('登陆成功'); location='index.jsp'; </script>");
} else {
// 密码错误
out.println("<script> alert('密码错误'); location='login.jsp'; </script>");
}
}
}
LogoutAction
package com.sjsq.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
@WebServlet("/LogoutAction")
public class LogoutAction extends HttpServlet {
private static final long serialVersionUID = 1L;
public LogoutAction() {
super();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
HttpSession session = req.getSession(false);
if (session == null) {
resp.sendRedirect("login.jsp");
return;
}
session.removeAttribute("User");
resp.sendRedirect("login.jsp");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
}
MulAction
package com.sjsq.servlet;
import com.sjsq.bean.Join;
import com.sjsq.dao.CourseDao;
import com.sjsq.dao.JoinDao;
import com.sjsq.dao.SigninDao;
import com.sjsq.dao.SigninStuDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet("/MulAction")
@MultipartConfig
public class MulAction extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String ope = req.getParameter("ope");
if (ope.equals("joincreat")) {
String c = req.getParameter("course_id");
String user_id = req.getParameter("user_id");
int course_id = Integer.valueOf(c);
Join join = new Join(course_id, user_id, "checking");
JoinDao joinDao = new JoinDao();
int result = joinDao.Creat(join);
if (result == 2) {
out.println("<script> alert('课程已经选过'); location='show_all_courses.jsp'; </script>");
} else if (result == 1) {
out.println("<script> alert('加入成功'); location='show_all_courses.jsp'; </script>");
} else {
out.println("<script> alert('加入失败'); location='show_all_courses.jsp'; </script>");
}
} else if (ope.equals("joinaccept")) {
String c = req.getParameter("course_id");
String user_id = req.getParameter("user_id");
int course_id = Integer.valueOf(c);
String from_ = req.getParameter("from_");
JoinDao joinDao = new JoinDao();
int result = joinDao.Update(course_id, user_id, "true");
if (result == 1) {
out.println("<script> alert('通过成功'); location='" + from_ + "'; </script>");
} else {
out.println("<script> alert('通过失败'); location='" + from_ + "'; </script>");
}
} else if (ope.equals("signincreat")) {
String c = req.getParameter("course_id");
int course_id = Integer.valueOf(c);
String from_ = req.getParameter("from_");
SigninDao signinDao = new SigninDao();
int result = signinDao.Creat(course_id);
if (result == 1) {
SigninStuDao signinStuDao = new SigninStuDao();
CourseDao courseDao = new CourseDao();
int signin_id = signinDao.FindLast(course_id);
signinStuDao.Creat(signin_id, course_id);
courseDao.Update(course_id, "true");
out.println("<script> alert('签到已开始'); location='" + from_ + "'; </script>");
} else {
out.println("<script> alert('开始失败'); location='" + from_ + "'; </script>");
}
} else if (ope.equals("signinstop")) {
String c = req.getParameter("course_id");
int course_id = Integer.valueOf(c);
String from_ = req.getParameter("from_");
CourseDao courseDao = new CourseDao();
int result = courseDao.Update(course_id, "false");
if (result == 1) {
SigninDao signinDao = new SigninDao();
signinDao.Update(signinDao.FindLast(course_id));
out.println("<script> alert('签到已停止'); location='" + from_ + "'; </script>");
} else {
out.println("<script> alert('停止失败'); location='" + from_ + "'; </script>");
}
} else if (ope.equals("signin")) {
String stu_id = req.getParameter("stu_id");
String c = req.getParameter("signin_id");
int signin_id = Integer.valueOf(c);
String from_ = java.net.URLDecoder.decode(req.getParameter("from_"), "UTF-8");
SigninStuDao signinStuDao = new SigninStuDao();
int result = signinStuDao.Update(signin_id, stu_id, "true");
if (result == 1) {
SigninDao signinDao = new SigninDao();
signinDao.AddNum(signin_id);
out.println("<script> alert('签到成功'); location='" + from_ + "'; </script>");
} else {
out.println("<script> alert('签到失败'); location='" + from_ + "'; </script>");
}
}
}
}
RegisterAction
package com.sjsq.servlet;
import com.sjsq.bean.User;
import com.sjsq.dao.UserDao;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet("/RegisterAction")
@MultipartConfig
public class RegisterAction extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
public RegisterAction() {
super();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
RequestDispatcher rd = req.getRequestDispatcher("register.jsp");
rd.forward(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String user_id = req.getParameter("inputUser_id");
String userPass = req.getParameter("inputPassword");
String Confirm = req.getParameter("confirmPassword");
String name = req.getParameter("inputName");
String type = req.getParameter("type");
int flag = 0;
for (int i = 0; i < user_id.length(); i++) if (user_id.charAt(i) < '0' || user_id.charAt(i) > '9') flag++;
if (flag != 0) {
out.println("<script> alert('学号只能含有数字'); location='register.jsp'; </script>");
} else if (!userPass.equals(Confirm)) {
out.println("<script> alert('两次密码不相同'); location='register.jsp'; </script>");
} else {
User user = new User(user_id, userPass, name, type);
UserDao userDao = new UserDao();
int result = userDao.create(user);
if (result == 1) {
out.println("<script> alert('注册成功'); location='login.jsp'; </script>");
} else {
if (result == 0) out.println("<script> alert('注册失败'); location='register.jsp'; </script>");
else out.println("<script> alert('该账号已被注册'); location='register.jsp'; </script>");
}
}
}
}
UpdateUserAction
package com.sjsq.servlet;
import com.sjsq.bean.User;
import com.sjsq.dao.UserDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
@WebServlet("/UpdateUserAction")
@MultipartConfig
public class UpdateUserAction extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doGet(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
String oldPass = req.getParameter("oldPassword");
String newPass = req.getParameter("newPassword");
String Confirm = req.getParameter("confirmPassword");
if (!newPass.equals(Confirm)) {
out.println("<script> alert('两次密码不相同'); location='update_user.jsp'; </script>");
} else {
User user = (User) req.getSession().getAttribute("User");
if (!user.getPassword().equals(oldPass)) {
out.println("<script> alert('原密码错误'); location='update_user.jsp'; </script>");
} else {
UserDao userDao = new UserDao();
int result = 0;
try {
result = userDao.Update(user.getId(), newPass);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (result == 1) {
HttpSession session = req.getSession(false);
session.removeAttribute("User");
out.println("<script> alert('修改密码成功'); location='login.jsp'; </script>");
resp.sendRedirect("login.jsp");
} else {
out.println("<script> alert('修改密码失败'); location='update_user.jsp'; </script>");
resp.sendRedirect("update_user.jsp");
}
}
}
}
}
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3. Remarks
If there is any infringement, please contact me to delete it.
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