目录

• 选课系统的总体设计
• • 学生选课系统的详细设计
  • 效果部分展示
  • 源码

选课系统的总体设计

（1）选课系统环境要求
1、搭建java开发环境并配置JDK、安装Intellij IDEA、Navicat、mysql等工具。
2、使用java自带的swing实现窗口化图形界面。
（2）选课系统功能及模块图
学生选课系统具体后端实现和功能为：
1、后端java逻辑层：实体类、dao层、util工具类、view展示类。
2、数据库：存储商品信息以及商品所属分类，管理员账号与密码。

学生选课系统整体的功能结构图如图3-1所示：

图3-1 学生选课系统功能结构图

学生选课系统的详细设计

(1）选课系统总体功能展示如图3-2所示：

图3-2总体功能展示图

(2）数据库设计如图3-3所示：

图3-3数据库设计展示图

(3）选课系统的实现
我主要负责的是数据库表的设计（navicat建表）连接数据库，以及登陆界面（LogOnFrm）的实现以及一部分后端逻辑层的代码，如数据库工具类（DbUtil）、字符工具类（StringUtil）、课程类（Course）等，代码如下：
(1)LogOnFrm类

package com.java.view;import java.awt.EventQueue;import java.awt.Font;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.sql.Connection;import javax.swing.ButtonGroup;import javax.swing.GroupLayout;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFormattedTextField;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPasswordField;import javax.swing.JRadioButton;import javax.swing.UIManager;import javax.swing.WindowConstants;import javax.swing.plaf.FontUIResource;import com.java.dao.LogOnDao;import com.java.model.Admin;import com.java.model.Student;import com.java.util.DbUtil;import com.java.util.StringUtil;//登录界面public class LogOnFrm extends JFrame {/** *  */private static final long serialVersionUID = 1L;//私有成员变量private ButtonGroup buttonGroup1;private JLabel jLabel1;private JLabel jLabel2;private JLabel jLabel3;private JButton jb_logOn;private JButton jb_reset;private JRadioButton jrb_admin;private JRadioButton jrb_student;private JPasswordField passwordTxt;private JFormattedTextField userNameTxt;DbUtil dbUtil = new DbUtil();LogOnDao logOnDao = new LogOnDao();public static Student currentStudent ;//构造方法public LogOnFrm() {//改变系统默认字体Font font = new Font("Dialog", Font.PLAIN, 12);@SuppressWarnings("rawtypes")java.util.Enumeration keys = UIManager.getDefaults().keys();while (keys.hasMoreElements()) {Object key = keys.nextElement();Object value = UIManager.get(key);if (value instanceof FontUIResource) {UIManager.put(key, font);}}//调用放置组件方法initComponents();//设置在windows系统中默认居于屏幕正中this.setLocationRelativeTo(null);this.jrb_student.setSelected(true);}//添加组件方法private void initComponents() {//创建组件buttonGroup1 = new ButtonGroup();jLabel1 = new JLabel();//“学生选课系统 ”大字 面板jLabel2 = new JLabel();//账户userNameTxt = new JFormattedTextField();//用户账号输入框jLabel3 = new JLabel();//密码passwordTxt = new JPasswordField();//用户密码输入框jrb_student = new JRadioButton();//学生复选按钮jrb_admin = new JRadioButton();//管理员复选按钮jb_logOn = new JButton();//登录按钮jb_reset = new JButton();//重置按钮//设置在windows系统中默认居于屏幕正中setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);setTitle("用户登录");setResizable(false);//设置字体jLabel1.setFont(new Font("隶书", 1, 24));//jLabel1设置图片jLabel1.setIcon(new ImageIcon(this.getClass().getResource("/com/java/view/image/sys.png")));//jLabel1设置文字jLabel1.setText("学生选课系统");jLabel2.setIcon(new ImageIcon(this.getClass().getResource("/com/java/view/image/userName.png")));jLabel2.setText("账户");jLabel3.setIcon(new ImageIcon(this.getClass().getResource("/com/java/view/image/password.png"))); jLabel3.setText("密码");//buttonGroup1添加学生按钮buttonGroup1.add(jrb_student);jrb_student.setText("学生");jrb_student.setIcon(new ImageIcon(this.getClass().getResource("/com/java/view/image/student.png")));//buttonGroup1添加管理员按钮buttonGroup1.add(jrb_admin);jrb_admin.setText("管理员");jrb_admin.setIcon(new ImageIcon(this.getClass().getResource("/com/java/view/image/admin.png")));jb_logOn.setIcon(new  ImageIcon(this.getClass().getResource("/com/java/view/image/login.png"))); jb_logOn.setText("登录 ");//用内部类的方式为登录按钮注册监听器jb_logOn.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {jb_logOnActionPerformed(evt);}});jb_reset.setIcon(new ImageIcon(this.getClass().getResource("/com/java/view/image/reset.png"))); jb_reset.setText("重置 ");//用内部类的方式为重置按钮注册监听器jb_reset.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {jb_resetActionPerformed(evt);}});//创建GroupLayout布局管理器GroupLayout layout = new GroupLayout(getContentPane());getContentPane().setLayout(layout);//设置沿水平轴确定组件的位置和大小layout.setHorizontalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addGap(106, 106, 106).addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING).addComponent(jLabel1).addGroup(layout.createSequentialGroup().addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING).addGroup(GroupLayout.Alignment.TRAILING,layout.createSequentialGroup().addComponent(jLabel3).addGap(33,33,33)).addGroup(layout.createSequentialGroup().addComponent(jLabel2).addGap(33,33,33))).addGap(6,6,6).addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING,false).addComponent(passwordTxt,0,0,Short.MAX_VALUE).addComponent(userNameTxt,GroupLayout.DEFAULT_SIZE,135,Short.MAX_VALUE).addGroup(GroupLayout.Alignment.LEADING,layout.createSequentialGroup().addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING).addComponent(jb_logOn).addComponent(jrb_student)).addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING,false).addGroup(layout.createSequentialGroup().addGap(29,29,29).addComponent(jb_reset)).addGroup(layout.createSequentialGroup().addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED).addComponent(jrb_admin,GroupLayout.DEFAULT_SIZE,GroupLayout.DEFAULT_SIZE,Short.MAX_VALUE))))))).addContainerGap(143, Short.MAX_VALUE)));//设置沿垂直轴确定组件的位置和大小layout.setVerticalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING).addGroup(    GroupLayout.Alignment.TRAILING,layout.createSequentialGroup().addContainerGap(77, Short.MAX_VALUE).addComponent(jLabel1).addGap(39, 39, 39).addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(jLabel2).addComponent(userNameTxt,GroupLayout.PREFERRED_SIZE,GroupLayout.DEFAULT_SIZE,GroupLayout.PREFERRED_SIZE)).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED).addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(jLabel3).addComponent(passwordTxt,GroupLayout.PREFERRED_SIZE,GroupLayout.DEFAULT_SIZE,GroupLayout.PREFERRED_SIZE)).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED).addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(jrb_student).addComponent(jrb_admin)).addGap(32, 32, 32).addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(jb_reset).addComponent(jb_logOn)).addGap(58, 58, 58)));pack();//依据放置的组件设定窗口的大小，使窗口恰好容纳所有的组件}//登录行为方法private void jb_logOnActionPerformed(ActionEvent evt) {//获取文本框中的信息String userName = userNameTxt.getText();String password = new String(passwordTxt.getPassword());//关于文本框中输入为空的各种情况的判断if (StringUtil.isEmpty(userName)) {JOptionPane.showMessageDialog(this, "账号不能为空!");return;}if (StringUtil.isEmpty(password)) {JOptionPane.showMessageDialog(this, "密码不能为空!");return;}//创建一个连接Connection con=null;if (this.jrb_student.isSelected()) {Student student = new Student(Integer.parseInt(userName), password);try {con=dbUtil.getCon();currentStudent = logOnDao.login(con,student);if (currentStudent != null) {this.dispose();new MainFrm_student().setVisible(true);} else {JOptionPane.showMessageDialog(this, "用户名或密码错误!");}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();JOptionPane.showMessageDialog(this, "登录失败!");}finally{try {dbUtil.closeCon(con);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}} else if (this.jrb_admin.isSelected()) {Admin admin = new Admin(Integer.parseInt(userName), password);try {con=dbUtil.getCon();Admin currentAdmin = logOnDao.login(con, admin);if (currentAdmin != null) {this.dispose();new MainFrm_admin().setVisible(true);} else {JOptionPane.showMessageDialog(this, "用户名或密码错误!");}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();JOptionPane.showMessageDialog(this, "登录失败!");}finally{try {dbUtil.closeCon(con);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}//重置行为方法private void jb_resetActionPerformed(ActionEvent evt) {this.resetValue();}//重置的清空文本框方法private void resetValue() {this.userNameTxt.setText("");this.passwordTxt.setText("");this.jrb_student.setSelected(true);//默认复选框选择学生}//主函数public static void main(String args[]) {EventQueue.invokeLater(new Runnable() {public void run() {new LogOnFrm().setVisible(true);}});}}

效果部分展示

源码

链接：https://pan.baidu.com/s/18yJygTEMutRBHvxslL8VsA
提取码：sxk9