学生成绩管理系统的设计-实践周作业

介绍

该程序是链接mysql数据库的，然后我们是使用了阿里云的云服务器配置了数据库（这个是另一个同学做的），不过一下代码对于本地数据库应该也是可以实现的，然后实现了一些基本的功能比如增删查改，使用了javaswing来写页面（比较丑哈哈），学生和老师注册登录啊之类的功能。

文件结构

代码

Main.java

import Mainfunction.CheckAccount;
import Mainfunction.CheckAccount2;
import Mainfunction.InsertStudentInformation;
import Mainfunction.InsertTeacherInformation;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
class Fun  implements ActionListener{
    Connection connection;
    JFrame frame=new JFrame();
    JLabel lb1;//顶部需要的组件
    Button bt1,bt2,bt3,bt4;
    //定义中间所需要的组件
    // 中部有4个panel，选项卡窗口管理
    JTabbedPane pane;
    JPanel panel_s,panel_t;
    JLabel label1,label2;
    JLabel label3,label4;
    JLabel stu;//用来提示这是学生的登录界面,学生默认输入长度为11位
    JLabel tea;//用来提示这是老师的登录界面,老师默认输入长度为3位

    JTextField textField_student;//学生区域的学生输入框
    JPasswordField Password_student;//密码输入框
    JTextField textField_teacher;//老师区域输入框
    JPasswordField Password_teacher;//老师区域密码输入框

    //底部所需要的组件
    JPanel jPanel1;
    JButton jButton;

    //3学生注册界面相关控件
    JPanel stu_register;
    JLabel S_register_lb1,S_register_lb2;
    JTextField S_register;
    JPasswordField S_pass;
    JLabel Student;

    //4老师注册界面相关控件
    JPanel tea_register;
    JLabel T_register_lb1,T_register_lb2;
    JTextField T_register;
    JPasswordField T_pass;
    JLabel Teacher;
    @Override
    public void actionPerformed(ActionEvent e) {
    }
    public Fun()
    {

        //数据库连接
        jdbcConnection jdbc=new jdbcConnection();
        connection=jdbc.giveConnection();

        //处理底部
        lb1=new JLabel(new ImageIcon("src/mao.png"));
        jPanel1=new JPanel();
        //jButton=new JButton("确定");
        //jPanel1.add(jButton);//将button组件加进去
        //后面舍弃了这种做法直接四个界面加入button应对不同的情况

        //处理中部
        panel_s=new JPanel(new GridLayout(3,3));
        label1=new JLabel("学生账号",JLabel.CENTER);
        label2=new JLabel("学生密码",JLabel.CENTER);
        textField_student=new JTextField();
        Password_student=new JPasswordField();
        stu=new JLabel("这里是学生登录界面",JLabel.CENTER);
        bt1=new Button("login");
        //按控件顺序加入到每个板面
        panel_s.add(label1);
        panel_s.add(textField_student);
        panel_s.add(label2);
        panel_s.add(Password_student);
        panel_s.add(stu);
        panel_s.add(bt1);

        //老师
        panel_t=new JPanel(new GridLayout(3,3));
        label3=new JLabel("老师账号",JLabel.CENTER);
        label4=new JLabel("老师密码",JLabel.CENTER);
        textField_teacher=new JTextField();
        Password_teacher=new JPasswordField();
        bt2=new Button("login");
        tea=new JLabel("这里是老师登录界面",JLabel.CENTER);

        panel_t.add(label3);
        panel_t.add(textField_teacher);
        panel_t.add(label4);
        panel_t.add(Password_teacher);
        panel_t.add(tea);
        panel_t.add(bt2);

        //学生注册
        stu_register=new JPanel(new GridLayout(3,3));
        S_register_lb1=new JLabel("注册学生账号",JLabel.CENTER);
        S_register_lb2=new JLabel("注册学生密码",JLabel.CENTER);
        S_register=new JTextField();
        S_pass=new JPasswordField();
        Student=new JLabel("这里是学生注册",JLabel.CENTER);
        bt3=new Button("register");

        Student.setForeground(Color.RED);

        stu_register.add(S_register_lb1);
        stu_register.add(S_register);
        stu_register.add(S_register_lb2);
        stu_register.add(S_pass);
        stu_register.add(Student);
        stu_register.add(bt3);
        //老师注册
        tea_register=new JPanel(new GridLayout(3,3));
        T_register_lb1=new JLabel("注册老师账号",JLabel.CENTER);
        T_register_lb2=new JLabel("注册老师密码",JLabel.CENTER);
        T_register=new JTextField();
        T_pass=new JPasswordField();
        Teacher=new JLabel("这里是进行老师注册",JLabel.CENTER);
        bt4=new Button("register");

        Teacher.setForeground(Color.BLUE);
        tea_register.add(T_register_lb1);
        tea_register.add(T_register);
        tea_register.add(T_register_lb2);
        tea_register.add(T_pass);
        tea_register.add(Teacher);
        tea_register.add(bt4);

        //创建选项卡窗口
        //加入页面

        pane=new JTabbedPane();
        pane.add("学生登录",panel_s);
        pane.add("老师登录",panel_t);
        pane.add("学生注册",stu_register);
        pane.add("老师注册",tea_register);
        frame.setSize(550,340);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
        frame.add(lb1,"North");
        frame.add(jPanel1,"South");
        frame.add(pane,"Center");

        bt1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String account= textField_student.getText();
                String password=new String(Password_student.getPassword());
                CheckAccount checkAccount=new CheckAccount(frame,connection,account,password);
                if(checkAccount.check()){
                    UserView view=  new UserView(1,connection,account);
                    frame.dispose();
                    // view.number=1;
                }
                else{
                    JOptionPane.showMessageDialog(
                            frame,
                            "登录错误",
                            "Error",
                            JOptionPane.INFORMATION_MESSAGE);
                }
            }
        });
        bt2.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

                String account= textField_teacher.getText();
                String password=new String(Password_teacher.getPassword());
                CheckAccount2 checkAccount=new CheckAccount2(frame,connection,account,password);
                if(checkAccount.check()){
                    UserView view=  new UserView(2,connection,account);
                    frame.dispose();
                    // view.number=1;
                }
                else{
                    JOptionPane.showMessageDialog(
                            frame,
                            "登录错误",
                            "Error",
                            JOptionPane.INFORMATION_MESSAGE);
                }

            }
        });
        bt3.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                try{
                    //读取账号和密码
                    String account= S_register.getText();
                    String password=new String(S_pass.getPassword());
                    //进行数字的判断
                    int number=Integer.parseInt(account);
                    //进行数字长度的判断
                    if(account.length()==6){
                        InsertStudentInformation s=new InsertStudentInformation(frame,connection,account,password);
                        if(s.giveBool()){
                            JOptionPane.showMessageDialog(
                                    frame,
                                    "注册成功",
                                    "Yes",
                                    JOptionPane.INFORMATION_MESSAGE);
                        }
                    }
                    else{
                        JOptionPane.showMessageDialog(
                                frame,
                                "账号不合法，注意为6位数字",
                                "Error",
                                JOptionPane.INFORMATION_MESSAGE);
                    }
                }catch (Exception exception){
                    JOptionPane.showMessageDialog(
                            frame,
                            "账号不合法，注意为三位数字",
                            "Error",
                            JOptionPane.INFORMATION_MESSAGE
                    );
                }
                //将学生的数据存入数据库
            }
        });
        bt4.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

                try{
                    //读取账号和密码
                    String account= T_register.getText();
                    String password=new String(T_pass.getPassword());
                    //进行数字的判断
                    int number=Integer.parseInt(account);
                    //进行数字长度的判断
                    if(account.length()==3){
                        InsertTeacherInformation t=new InsertTeacherInformation(frame,connection,account,password);
                        //返回bool值检查是否已存在已有账号
                        if(t.giveBool()){
                            JOptionPane.showMessageDialog(
                                    frame,
                                    "注册成功",
                                    "Yes",
                                    JOptionPane.INFORMATION_MESSAGE);
                        }
                    }
                    else{
                        JOptionPane.showMessageDialog(
                                frame,
                                "账号不合法，注意为3位数字",
                                "Error",
                                JOptionPane.INFORMATION_MESSAGE);
                    }
                }catch (Exception exception){
                    JOptionPane.showMessageDialog(
                            frame,
                            "账号不合法，注意为三位数字",
                            "Error",
                            JOptionPane.INFORMATION_MESSAGE
                    );
                }
                //老师的数据存入数据库
            }
        });
    }
}
public class Main {
    public static void main(String[] args) {
        Fun Fun=new Fun();
    }
}

UserView.java

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.Connection;
import check.*;
import check.Teacher_InsertScore;
import view.*;

import javax.swing.*;


public class UserView {
    //用户id
    private String id;
    //数据库
    private Connection connection;
    private JFrame userView = new JFrame("界面");
    private JPanel panel = new JPanel(new FlowLayout());
    public int number;
    //添加功能选择
    private JButton studentInformation = new JButton("学生信息");
    private JButton Student_Course = new JButton("学生选课");
    private JButton Teacher_Information = new JButton("老师信息");
    private JButton Teacher_CheckScore = new JButton("查看分数");
    private JButton Teacher_InsertScore = new JButton("登记分数");
    private JButton function6 = new JButton("数据库备份");
    //先声明功能的选择，到以后写好包之后即可删除
    private JFrame fuction5_View;
    private JFrame fuction6_View;

    public UserView(int number, Connection connection, String id) {
        this.connection = connection;
        this.number = number;
        this.id = id;
        init();
    }

    public void init() {

        if (this.number == 1) {
            studentInformation.setFont(new Font("", Font.BOLD, 15));
            panel.add(studentInformation);
            Student_Course.setFont(new Font("", Font.BOLD, 15));
            panel.add(Student_Course);
        } else {
            Teacher_Information.setFont(new Font("", Font.BOLD, 15));
            panel.add(Teacher_Information);
            Teacher_InsertScore.setFont(new Font("", Font.BOLD, 15));
            panel.add(Teacher_InsertScore);
            Teacher_CheckScore.setFont(new Font("", Font.BOLD, 15));
            panel.add(Teacher_CheckScore);
            function6.setFont(new Font("", Font.BOLD, 15));
            panel.add(function6);
        }


        //添加佛大图片
        JLabel Fosu = new JLabel(new ImageIcon("src/img.png"));
        panel.add(Fosu);
        Fosu.setBounds(0, 150, 700, 200);
        //添加文字
        JLabel showName = new JLabel("成绩管理系统");
        showName.setFont(new Font("", Font.BOLD, 22));
        panel.add(showName);
        userView.add(panel);
        userView.setSize(500, 500);
        userView.setLocationRelativeTo(null);
        userView.setVisible(true);
        userView.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        /*
         * 给按钮添加事件监听器
         */
        //学生信息页面
        studentInformation.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                userView.setVisible(false);
                Student_Information student_information = new Student_Information(connection, id, userView);
                student_information.studentView.addWindowListener(new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent e) {
                        userView.setVisible(true);
                        userView.setLocationRelativeTo(null);
                        super.windowClosing(e);
                    }
                });

            }
        });
        //学生选课页面
        Student_Course.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                //这里为功能输入，后期直接写好包之后导入即可
                userView.setVisible(false);
                Student_Course course1 = new Student_Course(connection, id);
                course1.course.addWindowListener(new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent e) {
                        userView.setVisible(true);
                        userView.setLocationRelativeTo(null);
                        super.windowClosing(e);
                    }
                });

            }
        });
        //老师信息页面
        Teacher_Information.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                userView.setVisible(false);
                Teacher_Information course1 = new Teacher_Information(connection, id, userView);
                course1.teacherView.addWindowListener(new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent e) {
                        userView.setVisible(true);
                        userView.setLocationRelativeTo(null);
                        super.windowClosing(e);
                    }
                });
            }
        });
        //登记分数。
        Teacher_InsertScore.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                userView.setVisible(false);
                Teacher_InsertScore teacher_insertScore=new Teacher_InsertScore(id);
                teacher_insertScore.jFrame.addWindowListener(new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent e) {
                        userView.setVisible(true);
                        userView.setLocationRelativeTo(null);
                        super.windowClosing(e);
                    }
                });

            }
        });
        //检查分数
        Teacher_CheckScore.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                userView.setVisible(false);
                Teacher_CheckScore teacher_checkScore = new Teacher_CheckScore(connection, id);
                teacher_checkScore.jf.addWindowListener(new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent e) {
                        userView.setVisible(true);
                        userView.setLocationRelativeTo(null);
                        super.windowClosing(e);
                    }
                });
            }
        });
        //功能六页面
        function6.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                //这里为功能输入，后期直接写好包之后导入即可
//                fuction2_View = Singleton2.getInstance(); 单例模式
                fuction6_View = new JFrame();
                fuction6_View.setTitle("第二个窗口");
                fuction6_View.setSize(500, 500);
                fuction6_View.setLocationRelativeTo(null);
                userView.setVisible(false);
                fuction6_View.setVisible(true);
                fuction6_View.addWindowListener(new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent e) {
                        userView.setVisible(true);
                        super.windowClosing(e);
                    }
                });
            }
        });

    }
}

jdbcConnection

import java.sql.*;
public class jdbcConnection {
    Connection connection;
    public jdbcConnection() {
        Connection conn = null;
        try {
            try {
                DriverManager.registerDriver(new com.mysql.cj.jdbc.Driver());
            } catch (SQLException e) {
                e.printStackTrace();
            }
            String url = "jdbc:mysql://XXXXX";//这里为自己的数据库的链接
            String user = "XXXX";   //这里的信息是需要更改的账号
            String password = "XXXX";//这里的信息是需要更改的密码
            conn = DriverManager.getConnection(url, user, password);
            System.out.println("数据库连接对象" + conn);
            connection= conn;

        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public Connection giveConnection(){
        return connection;
    }
}

check包

DBexecute

package check;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DBexecute {
    Connection connection;
    private PreparedStatement pstm;
    private ResultSet rs;

    public Connection getConnection() throws Exception {
        try {
            String url = "jdbc:mysql://120.25.152.50:3306/database";
            String user = "root";   //这里的信息是需要更改的
            String password = "zqy939597A";
            connection = DriverManager.getConnection(url, user, password);
            System.out.println("数据库连接对象" + connection);
            return connection;
        } catch (Exception e) {
            throw new SQLException("驱动错误或连接失败！");
        }
    }

    //查询操作
    public ResultSet executeQurey(String sql,String a) {

        try {
            //得到preparaStatement语句
            pstm = connection.prepareStatement(sql);
            if(a!=null){
                pstm.setString(1,a);
            }
            //执行sql语句
            rs = pstm.executeQuery();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //返回查询结果集
        return rs;
    }

    //插入、删除操作
    public int executeUpdate(String sql, String[] data,String course) {
        int count = 0;
        try {
            pstm = connection.prepareStatement(sql);
            if (data != null) {
                for (int i = 0; i < data.length; i++) {
                    pstm.setString(i + 1, data[i]);
                }

                count = pstm.executeUpdate();
                String sql1 = "update score set course=? where id=?";
                pstm = connection.prepareStatement(sql1);
                System.out.println("!!!"+course);
                System.out.println("!!!"+data[0]);
                pstm.setString(1,course);
                pstm.setString(2,data[0]);
                pstm.executeUpdate();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        //返回修改成功的行数
        return count;
    }
    public int executeDelete(String sql, String[] data) {
        int count = 0;
        try {
            pstm = connection.prepareStatement(sql);
            if (data != null) {
                for (int i = 0; i < data.length; i++) {
                    pstm.setString(i + 1, data[i]);
                }
                count = pstm.executeUpdate();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        //返回修改成功的行数
        return count;
    }

    public void closeAll() {
        // 如果rs不空，关闭rs
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        // 如果pstm不空，关闭pstm
        if (pstm != null) {
            try {
                pstm.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        // 如果conn不空，关闭conn
        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

Teacher_InsertScore

package check;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.Vector;

import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;

public class Teacher_InsertScore  {
    private String id;
    public JFrame jFrame =new JFrame();
    //滚动面板
    private JScrollPane sptable;
    //表格
    private JTable table;
    //放置按钮的面板
    private JPanel panel;
    //设置按钮
    private JButton btsave, btdelete, btadd, btflush;
    //设置默认表格格式
    private DefaultTableModel model;
    private String course;
    Connection connection;


    public Teacher_InsertScore(String id) {
        this.id=id;
        returnCourse();
        jFrame.setTitle(course+"课程成绩管理页面");
        //设置表格
        model = new DefaultTableModel();
        table = new JTable(model);
        table.setForeground(Color.BLACK);                   // 字体颜色
        table.setFont(new Font(null, Font.PLAIN, 14));      // 字体样式
        table.setSelectionForeground(Color.DARK_GRAY);      // 选中后字体颜色
        table.setSelectionBackground(Color.LIGHT_GRAY);     // 选中后字体背景
        table.setGridColor(Color.GRAY);
        table.getTableHeader().setFont(new Font("楷体", Font.BOLD, 14));  // 设置表头名称字体样式
        table.getTableHeader().setForeground(Color.RED);                // 设置表头名称字体颜色
        table.getTableHeader().setResizingAllowed(false);               // 设置不允许手动改变列宽
        table.getTableHeader().setReorderingAllowed(false);             // 设置不允许拖动重新排序各列
        //将表格放入滚动面板中
        sptable = new JScrollPane(table);

        //将滚动面板放入主面板中部
        jFrame.add(sptable, BorderLayout.CENTER);

        btsave = new JButton("保存");
        btadd = new JButton("添加");
        btdelete = new JButton("删除");
        btflush = new JButton("刷新");
        panel = new JPanel();
        panel.add(btadd);
        panel.add(btsave);
        panel.add(btdelete);
        panel.add(btflush);
        btsave.setVisible(false);
        jFrame.add(panel, BorderLayout.SOUTH);


        //显示初始数据
        showData();
        //设置界面基本数据
        jFrame.setSize(1000, 600);
        jFrame.setLocationRelativeTo(null);
        jFrame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
        jFrame.setVisible(true);

        //添加监听器，因为每个实现的功能不同，所以这里使用匿名内部类来实现

        btadd.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                addData();

            }
        });
        btsave.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                saveDate();
            }
        });
        btdelete.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                deleteDate();
            }
        });
        btflush.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                showData();
            }
        });

    }

     void showData() {
        // TODO Auto-generated method stub


         try {
             returnCourse();
             String sql = "select id,name,score from score where course= ? ";
             DBexecute db = new DBexecute();
             connection=db.getConnection();
            //连接数据库
            db.getConnection();
            //获取返回集
            ResultSet rs = db.executeQurey(sql,course);
            //获取列名
             System.out.println(id);
             System.out.println(course);
            ResultSetMetaData rsmt = rs.getMetaData();
            //获取列数
            int count = rsmt.getColumnCount();
            //创建一个Vector集合存放列名title
            Vector title = new Vector<>();
            //存放列名
            for (int i = 1; i <= count; i++) {
                title.add(rsmt.getColumnLabel(i));
            }

            //存放集合（行数据）的集合
            Vector> data = new Vector();
            //判断表中有无数据
            int rowCount = 0;
            //将数据放入data中
            while (rs.next()) {
                rowCount++;
                //设置一个集合存放行数据，在放入data中
                Vector rowData = new Vector<>();
                for (int i = 1; i <= count; i++) {
                    rowData.add(rs.getString(i));
                }
                data.add(rowData);
            }
            if (rowCount == 0) {
                //若行为0即数据库表中没有数据，便将title列名放入table即可
                model.setDataVector(null, title);
            } else {
                //若有数据，则将调用setDataVector将title插入data的第0列
                model.setDataVector(data, title);
            }

        } catch (Exception e) {
            e.printStackTrace();
            JOptionPane.showMessageDialog(jFrame, "系统错误！请仔细检查！");
        }

    }

    private void addData() {
        // TODO Auto-generated method stub
        int rowCount = model.getRowCount();
        int rowCount1 = table.getRowCount();
        //最好使用Object[]
        model.insertRow(rowCount, new String[]{"0", "0","0"});
        btadd.setVisible(false);
        btsave.setVisible(true);
    }

    private void saveDate() {
        // TODO Auto-generated method stub
        int rowCount = table.getRowCount() - 1;
        //获取自己填写的数据
        String id = table.getValueAt(rowCount, 0).toString();
        String name = table.getValueAt(rowCount, 1).toString();
        String score = table.getValueAt(rowCount, 2).toString();
        DBexecute db = new DBexecute();

        try {
            db.getConnection();
            String sql = "insert score values(?,?,?,?)";
            int count = db.executeUpdate(sql, new String[]{id,name,null,score},course);
            showData();
            btadd.setVisible(true);
            btsave.setVisible(false);

            if (count == 1) {
                JOptionPane.showMessageDialog(jFrame, "插入数据成功！");
            } else {
                JOptionPane.showMessageDialog(jFrame, "插入数据失败！");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            db.closeAll();
        }

    }

    private void deleteDate() {
        // TODO Auto-generated method stub
        int index[] = table.getSelectedRows();

        if (index == null) {
            JOptionPane.showMessageDialog(jFrame, "请选择需要删除的数据！", "删除", JOptionPane.PLAIN_MESSAGE);
        } else {
            try {
                int k = JOptionPane.showConfirmDialog(jFrame, "是否要删除这条记录？", "删除", JOptionPane.YES_NO_OPTION,
                        JOptionPane.QUESTION_MESSAGE);
                if (k == JOptionPane.YES_OPTION) {
                    DBexecute db = new DBexecute();
                    try {
                        db.getConnection();
                        String sql = "delete from score where id=?";
                        String name = table.getValueAt(index[0], 0).toString();
                        int count = db.executeDelete(sql, new String[]{name});
                        showData();

                        if (count == 1) {
                            JOptionPane.showMessageDialog(jFrame, "删除数据成功！", "成功", JOptionPane.INFORMATION_MESSAGE);

                        } else {
                            JOptionPane.showMessageDialog(jFrame, "删除数据失败！", "失败", JOptionPane.WARNING_MESSAGE);
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                        db.closeAll();
                    }
                }
            } catch (Exception ee) {
                JOptionPane.showMessageDialog(jFrame, "抱歉!删除数据失败!【系统异常！】", "失败:", 0);
            }
        }

    }
    public void returnCourse() {
        try {
            DBexecute db = new DBexecute();
            db.getConnection();
            String sql="select course from 老师基本信息表 where teacherid=?";
            ResultSet rs=db.executeQurey(sql,id);
            if(rs.next()){
                this.course=rs.getString(1);
            }

        } catch (Exception e) {

        }


    }
}

Mainfunction包

CheckAccount

package Mainfunction;

import javax.swing.*;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class CheckAccount {
    private Connection connection;
    private String  account;
    private JFrame frame;
    private String  password;
    PreparedStatement stmt=null;
    ResultSet result=null;
    public CheckAccount(JFrame frame,Connection connection, String account, String password){
        this.frame=frame;
        this.account=account;
        this.password=password;
        this.connection=connection;
    }
    public boolean check(){
        try {
            String sql = "select * from studentregister where username= ? and password= ? ";
            stmt = connection.prepareStatement(sql);
            stmt.setString(1, account);
            stmt.setString(2, password);
            result = stmt.executeQuery();
            if (result.next()) {
                JOptionPane.showMessageDialog(
                        frame,
                        "登录成功",
                        "Yes",
                        JOptionPane.INFORMATION_MESSAGE);
                return true;
            }
            else{
                return false;
            }

        }
        catch (Exception e){
            return  false;

        }


    }
}

CheckAccount1

package Mainfunction;

import javax.swing.*;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class CheckAccount2 {
    private Connection connection;
    private String account;
    private JFrame frame;
    private String password;
    PreparedStatement stmt = null;
    ResultSet result = null;

    public CheckAccount2(JFrame frame, Connection connection, String account, String password) {
        this.frame = frame;
        this.account = account;
        this.password = password;
        this.connection = connection;
    }

    public boolean check() {
        try {
            String sql = "select * from teacherregister where username= ? and password= ? ";
            stmt = connection.prepareStatement(sql);
            stmt.setString(1, account);
            stmt.setString(2, password);
            result = stmt.executeQuery();
            if (result.next()) {
                JOptionPane.showMessageDialog(
                        frame,
                        "登录成功",
                        "Yes",
                        JOptionPane.INFORMATION_MESSAGE);
                return true;
            } else {
                return false;
            }

        } catch (Exception e) {
            return false;

        }


    }
}

InsertStudentInformation

package Mainfunction;

import javax.swing.*;
import java.sql.*;

public class InsertStudentInformation {
    private String account;
    private String password;
    private Connection connection;
    private JFrame frame;
    PreparedStatement stmt=null;
    ResultSet result=null;
    public InsertStudentInformation(JFrame frame,Connection connection,String  account,String password){
        this.account=account;
        this.password=password;
        this.connection=connection;
        this.frame=frame;

    }
    public boolean giveBool(){
        try {
            String sql = "select * from studentregister where username= ?";
            stmt = connection.prepareStatement(sql);
            stmt.setString(1, account);
            result = stmt.executeQuery();
            //查询到已有账号就是已经存在，则返回false
            if (result.next()) {
                JOptionPane.showMessageDialog(
                        frame,
                        "注册错误,已存在此账号",
                        "No",
                        JOptionPane.INFORMATION_MESSAGE);

                return false;
            }
            //插入注册的账号和密码
            String sql1 = "insert into studentregister value (?,?)";
            String sql2 = "insert into 学生基本信息表 value (?,?,?,?)";
            PreparedStatement pstmt = connection.prepareStatement(sql1);
            PreparedStatement pstmt2 = connection.prepareStatement(sql2);
            pstmt.setString(1,account);
            pstmt.setString(2,password);
            pstmt2.setString(1,account);
            pstmt2.setString(2,"null");
            pstmt2.setString(3,"null");
            pstmt2.setString(4,"null");
            int count1 = pstmt.executeUpdate();
            int count2 = pstmt2.executeUpdate();
            if(count1 ==1&&count2==1){
                return true;
            }

        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
        return true;
    }
}

InsertTeacherInformation

``
package Mainfunction;

import javax.swing.;
import java.sql.;

public class InsertTeacherInformation {
private String account;
private String password;
private Connection connection;
private JFrame frame;
PreparedStatement stmt=null;
ResultSet result=null;
public InsertTeacherInformation(JFrame frame,Connection connection,String account,String password){
this.account=account;
this.password=password;
this.connection=connection;
this.frame=frame;

}
public boolean giveBool(){
    try {
        String sql = "select * from teacherregister where username= ?";
        stmt = connection.prepareStatement(sql);
        stmt.setString(1, account);
        result = stmt.executeQuery();
        //查询到已有账号就是已经存在，则返回false
        if (result.next()) {
            JOptionPane.showMessageDialog(
                    frame,
                    "注册错误,已存在此账号",
                    "No",
                    JOptionPane.INFORMATION_MESSAGE);
            return false;
        }
        //插入注册的账号和密码
        String sql1 = "insert into teacherregister value (?,?)";
        String sql2 = "insert into 老师基本信息表 value (?,?,?,?)";
        PreparedStatement pstmt = connection.prepareStatement(sql1);
        PreparedStatement pstmt2 = connection.prepareStatement(sql2);
        pstmt.setString(1,account);
        pstmt.setString(2,password);
        pstmt2.setString(1,account);
        pstmt2.setString(2,"null");
        pstmt2.setString(3,"null");
        pstmt2.setString(4,"null");
        int count1 = pstmt.executeUpdate();
        int count2 = pstmt2.executeUpdate();
        if(count1 ==1&&count2==1){
            return true;
        }

    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return false;
    }
    return true;
}

view包

Student_Coures

package view;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.sql.Connection;
import java.sql.PreparedStatement;

public class Student_Course extends Component implements ActionListener {
    ActionEvent event;
    private Connection connection;
    private String id;
    private int selectclass;
    public JFrame course=new JFrame();
    private JPanel panel = new JPanel(new GridLayout());
    public Student_Course(Connection connection,String id){
        this.connection=connection;
        this.id=id;
        init();
    }

    void init(){
        course=new JFrame();
        course.setTitle("学生选课查询");
        course.setSize(500,500);
        JRadioButton b1=new JRadioButton("大数据技术");
        b1.setFont(new Font("", Font.BOLD, 15));
        JRadioButton b2=new JRadioButton("算法分析与设计");
        b2.setFont(new Font("", Font.BOLD, 15));
        JRadioButton b3=new JRadioButton("Kotlin语言");
        b3.setFont(new Font("", Font.BOLD, 15));
        JRadioButton b4=new JRadioButton("汇编语言");
        b4.setFont(new Font("", Font.BOLD, 15));
        b1.setBounds(75,50,100,30);
        b2.setBounds(75,90,100,30);
        b3.setBounds(75,130,100,30);
        b4.setBounds(75,170,100,30);
        ButtonGroup bg=new ButtonGroup();
        JTextArea area=new JTextArea("请选择你的选课,点击选择后页面会自动退出，请注意",40,40);
        area.setFont(new Font("", Font.BOLD, 22));
        area.setEditable(false);
        area.setLineWrap(true);
        bg.add(b1);
        bg.add(b2);
        bg.add(b3);
        bg.add(b4);
        panel.add(area);
        panel.add(b1);
        panel.add(b2);
        panel.add(b3);
        panel.add(b4);
        course.add(panel);
        course.setLocationRelativeTo(null);
        course.setVisible(true);
        b1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(b1.isSelected())
                {
                    JOptionPane.showMessageDialog(course,"你已选择大数据技术课程成功");
                    selectclass=1;
                    updateCourse(selectclass);
                    course.dispatchEvent(new WindowEvent(course,WindowEvent.WINDOW_CLOSING) );
                }
            }
        });
        b2.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(b2.isSelected())
                {
                    JOptionPane.showMessageDialog(course,"你已选择算法设计与分析课程成功");
                    selectclass=2;
                    updateCourse(selectclass);
                    course.dispatchEvent(new WindowEvent(course,WindowEvent.WINDOW_CLOSING) );
                }
            }
        });
        b3.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(b3.isSelected())
                {
                    JOptionPane.showMessageDialog(course,"你已选择Kotlin语言课程成功");
                    selectclass=3;
                    updateCourse(selectclass);
                    course.dispatchEvent(new WindowEvent(course,WindowEvent.WINDOW_CLOSING) );
                }
            }
        });
        b4.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(b4.isSelected())
                {
                    JOptionPane.showMessageDialog(course,"你已选择汇编语言成功");
                    selectclass=4;
                    updateCourse(selectclass);
                    course.dispatchEvent(new WindowEvent(course,WindowEvent.WINDOW_CLOSING) );
                }
            }
        });

    }

    @Override
    public void actionPerformed(ActionEvent e) {

    }
    public void updateCourse(int i){
        String a="大数据技术";
        String b="算法分析与设计";
        String c="Kotlin语言";
        String d="汇编语言";
        switch (i){
            case 1:
                try{
                    String sql = "update  学生基本信息表 set course=? where id=?";
                    PreparedStatement pstmt = connection.prepareStatement(sql);
                    pstmt.setString(1,a);
                    pstmt.setString(2,id);
                    pstmt.executeUpdate();
                }catch (Exception abc){
                }
                break;
            case 2:
                try{
                    String sql = "update  学生基本信息表 set course=? where id=?";
                    PreparedStatement pstmt = connection.prepareStatement(sql);
                    pstmt.setString(1,b);
                    pstmt.setString(2,id);
                    pstmt.executeUpdate();
                }catch (Exception abc){
                }
                break;
            case 3:
                try{
                    String sql = "update  学生基本信息表 set course=? where id=?";
                    PreparedStatement pstmt = connection.prepareStatement(sql);
                    pstmt.setString(1,c);
                    pstmt.setString(2,id);
                    pstmt.executeUpdate();
                }catch (Exception abc){
                }
                break;
            case 4:
                try{
                    String sql = "update  学生基本信息表 set course=? where id=?";
                    PreparedStatement pstmt = connection.prepareStatement(sql);
                    pstmt.setString(1,d);
                    pstmt.setString(2,id);
                    pstmt.executeUpdate();
                }catch (Exception abc){
                }
                break;
        }

    }
}
### Student_Information

package view;

import javax.swing.;
import java.awt.;
import java.awt.event.ActionEvent;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class Student_Information {
ResultSet result=null;
private String id;
private String name;
private String classes;
private String course;
private JFrame userview;
private Connection connection;
private int score;
public JFrame studentView=new JFrame();
private JPanel panel = new JPanel(new GridLayout());
JTextField textField_stu=new JTextField();
JTextField textField_class=new JTextField();
JTextField textField_account=new JTextField();
JTextField textField_course=new JTextField();
JTextField fun_course=new JTextField();
JButton submit=new JButton(“提交”);
JButton Return=new JButton(“返回”);
public Student_Information(Connection connection,String id,JFrame userview){
this.connection=connection;
this.userview=userview;
this.id=id;
init();
}
void init(){
studentView=new JFrame();
studentView.setTitle(“学生信息查询”);
studentView.setSize(500,500);
studentView.setLocationRelativeTo(null);
studentView.setVisible(true);
GridLayout layout=new GridLayout(6,2);
JPanel panel=new JPanel(layout);//设置为layout布局
JLabel L_stu=new JLabel(“名字”);
JLabel L_class=new JLabel(“班级”);
JLabel L_account=new JLabel(“账户”);
JLabel L_course=new JLabel(“已选课程”);
JLabel L_fun=new JLabel(“所选课程成绩”);
L_fun.setFont(new Font(“”,Font.BOLD,22));

    fun_course.setFont(new Font("",Font.BOLD,22));
    textField_account.setEditable(false);
    textField_course.setEditable(false);
    fun_course.setEditable(false);
    L_stu.setFont(new Font("",Font.BOLD,22));
    L_class.setFont(new Font("",Font.BOLD,22));
    L_account.setFont(new Font("",Font.BOLD,22));
    L_course.setFont(new Font("",Font.BOLD,22));
    textField_course.setFont(new Font("",Font.BOLD,22));
    textField_class.setFont(new Font("",Font.BOLD,22));
    textField_stu.setFont(new Font("",Font.BOLD,22));
    textField_account.setFont(new Font("",Font.BOLD,22));
    submit.setFont(new Font("",Font.BOLD,22));
    Return.setFont(new Font("",Font.BOLD,22));
    giveFun();
    panel.add(L_account);
    panel.add(textField_account);
    panel.add(L_class);
    panel.add(textField_class);
    panel.add(L_stu);
    panel.add(textField_stu);
    panel.add(L_course);
    panel.add(textField_course);
    panel.add(L_fun);
    panel.add(fun_course);
    panel.add(submit);
    panel.add(Return);
    studentView.add(panel);
    studentView.setVisible(true);
    getInformation();
    function();
}
public void getInformation(){
    try {
        PreparedStatement stmt=null;
        String sql = "select * from 学生基本信息表 where id= ?  ";
        System.out.println(id);
        stmt = connection.prepareStatement(sql);
        stmt.setString(1, id);
        result = stmt.executeQuery();
        if (result.next()) {
            textField_account.setText(result.getString(1));
            textField_class.setText(result.getString(3));
            textField_stu.setText(result.getString(2));
            textField_course.setText(result.getString(4));
            course=result.getString(4);
            System.out.println("!"+course);
        }
        giveFun();
    }catch (Exception e){
    }
}
public void function(){
    submit.addActionListener(new AbstractAction() {
        @Override
        public void actionPerformed(ActionEvent e) {
            try{
                id=textField_account.getText();
                name=textField_stu.getText();
                classes=textField_class.getText();
                course=textField_course.getText();
                String sql = "update  学生基本信息表 set name=?,class=? where id=?";
                PreparedStatement pstmt = connection.prepareStatement(sql);
                pstmt.setString(1,name);
                pstmt.setString(2,classes);
                pstmt.setString(3,id);
                giveFun();
                int count = pstmt.executeUpdate();
                if(count==1){
                    JOptionPane.showMessageDialog(
                            studentView,
                            "提交成功",
                            "Yes",
                            JOptionPane.INFORMATION_MESSAGE);
                }
            }catch(Exception exception){

            }
        }
    });
    Return.addActionListener(new AbstractAction() {
        @Override
        public void actionPerformed(ActionEvent e) {
            userview.setVisible(true);
            studentView.dispose();
        }
    });

}
public void giveFun(){
    try{
        course=textField_course.getText();

        String sql = " select score from score where id=? and course=? ";
        PreparedStatement pstmt = connection.prepareStatement(sql);
        pstmt.setString(1, id);
        pstmt.setString(2, course);
        ResultSet resultset = pstmt.executeQuery();
        if (resultset.next())
            score = resultset.getInt(1);
        fun_course.setText( String.valueOf(score));
    }catch (Exception e){
        score=0;
        fun_course.setText( String.valueOf(score));

    }

}

}

Teacher_Checkscore

package view;

import com.mysql.cj.protocol.Resultset;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.concurrent.ExecutionException;

//大概每个模块的粗略模板
public class Teacher_CheckScore {
    private Connection connection;
    private String course;
    private String id;
    private int fun;
    public JFrame jf;
    ResultSet resultset = null;

    public Teacher_CheckScore(Connection connection, String id) {
        this.connection = connection;
        this.id = id;
        exe();
    }

    void exe() {
        try {
            jf = new JFrame("查看成绩");
            jf.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
            returnCourse();
            JPanel panel = new JPanel(new BorderLayout());
            String lSqlStr = "select count(*) from score where course=?";
            PreparedStatement statement1 = connection.prepareStatement(lSqlStr);
            statement1.setString(1, course);
            resultset = statement1.executeQuery();
            int count = 0;
            if (resultset.next()) {
                count = resultset.getInt(1);
                System.out.println("numberOfRows= " + count);
                String sql = " select * from score  where course=? ";
                PreparedStatement statement = connection.prepareStatement(sql);
                statement.setString(1, course);
                resultset = statement.executeQuery();
                System.out.println(count);
                Object[][] rowData = new Object[count][4];
                System.out.println(rowData.length);
                int i = 0;
                while (resultset.next()) {
                    rowData[i][0] = resultset.getString(1);
                    rowData[i][1] = resultset.getString(2);
                    rowData[i][2] = resultset.getString(3);
                    rowData[i][3] = resultset.getString(4);
                    i++;
                }
                // 表头（列名）
                Object[] columnNames = {"id", "名字", "科目", "分数"};
                // 表格所有行数据
                // 创建一个表格，指定 所有行数据 和 表头
                JTable table = new JTable(rowData, columnNames);
                // 设置表格内容颜色
                table.setForeground(Color.BLACK);                   // 字体颜色
                table.setFont(new Font(null, Font.PLAIN, 14));      // 字体样式
                table.setSelectionForeground(Color.DARK_GRAY);      // 选中后字体颜色
                table.setSelectionBackground(Color.LIGHT_GRAY);     // 选中后字体背景
                table.setGridColor(Color.GRAY);                     // 网格颜色
                // 设置表头
                table.getTableHeader().setFont(new Font(null, Font.BOLD, 14));  // 设置表头名称字体样式
                table.getTableHeader().setForeground(Color.RED);                // 设置表头名称字体颜色
                table.getTableHeader().setResizingAllowed(false);               // 设置不允许手动改变列宽
                table.getTableHeader().setReorderingAllowed(false);             // 设置不允许拖动重新排序各列
                table.setEnabled(false);
                // 设置行高
                table.setRowHeight(30);
                // 第一列列宽设置为40
                table.getColumnModel().getColumn(0).setPreferredWidth(40);
                // 设置滚动面板视口大小（超过该大小的行数据，需要拖动滚动条才能看到）
                table.setPreferredScrollableViewportSize(new Dimension(500, 500));
                // 把 表格 放到 滚动面板 中（表头将自动添加到滚动面板顶部）
                JScrollPane scrollPane = new JScrollPane(table);
                // 添加 滚动面板 到 内容面板

                panel.add(scrollPane);
                JPanel panel1=new JPanel();
                JButton seekScore = new JButton("查看成绩");
                seekScore.addActionListener(new AbstractAction() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        giveFun();
                        JOptionPane.showMessageDialog(
                                jf,
                                "该课程的平均分为"+fun,
                                "avg",
                                JOptionPane.INFORMATION_MESSAGE
                        );
                    }
                });


                panel1.add(seekScore);


                // 设置 内容面板 到 窗口
                jf.setContentPane(panel);
                jf.add(panel1, BorderLayout.SOUTH);
                jf.pack();
                jf.setLocationRelativeTo(null);
                jf.setVisible(true);
            }

        } catch (Exception e) {

        }

    }

    public void giveFun(){
        try{
            String sql = " select avg(score) from score where course=? ";
            PreparedStatement pstmt = connection.prepareStatement(sql);
            pstmt.setString(1, course);
            ResultSet resultset = pstmt.executeQuery();
            if (resultset.next())
                fun = resultset.getInt(1);
        }catch (Exception e){

        }

    }
    public void returnCourse() {
        try {
            String sql = " select course from 老师基本信息表  where teacherid=? ";
            PreparedStatement pstmt = connection.prepareStatement(sql);
            pstmt.setString(1, id);
            ResultSet resultset = pstmt.executeQuery();
            if (resultset.next())
                course = resultset.getString(1);
            else {
                JOptionPane.showMessageDialog(
                        jf,
                        "该老师没有选择教任何的课",
                        "No",
                        JOptionPane.INFORMATION_MESSAGE);
                jf.dispose();
            }


        } catch (Exception e) {

        }


    }

    public void function2() {
    }

    public void function3() {
    }

    public void function4() {
    }

}

Teacher_Information

package view;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Teacher_Information {
    ResultSet result = null;
    private String id;
    private String name;
    private String pos;
    private String course;
    private JFrame userview;
    private Connection connection;
    public JFrame teacherView = new JFrame();
    private JPanel panel = new JPanel(new GridLayout());
    JTextField textField_tea = new JTextField();
    JTextField textField_pos = new JTextField();
    JTextField textField_account = new JTextField();
    JButton submit = new JButton("提交");
    JButton Return = new JButton("返回");
    JComboBox comboBox;
    int coursenumber;

    public Teacher_Information(Connection connection, String id, JFrame userview) {
        this.connection = connection;
        this.userview = userview;
        this.id = id;
        init();
    }

    void init() {
        teacherView = new JFrame();
        teacherView.setTitle("老师信息查询");
        teacherView.setSize(500, 500);
        teacherView.setLocationRelativeTo(null);
        teacherView.setVisible(true);
        GridLayout layout = new GridLayout(5, 2);
        JPanel panel = new JPanel(layout);//设置为layout布局
        JLabel L_tea = new JLabel("姓名");
        JLabel L_pos = new JLabel("职位");
        JLabel L_account = new JLabel("账户");
        JLabel L_choose = new JLabel("讲授的课程");

        textField_account.setEditable(false);
        L_tea.setFont(new Font("", Font.BOLD, 22));
        L_pos.setFont(new Font("", Font.BOLD, 22));
        L_account.setFont(new Font("", Font.BOLD, 22));
        L_choose.setFont(new Font("", Font.BOLD, 12));
        String[] listData = {"无", "大数据技术", "算法分析与设计", "Kotlin语言", "汇编语言"};
        comboBox = new JComboBox(listData);
        course=returnCourse();
        System.out.println(course);
        System.out.println(coursenumber);
        coursenumber=returnNumber(course);
        comboBox.setSelectedIndex(coursenumber);
        comboBox.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
                String lesson = (String) comboBox.getSelectedItem();
                try {
                    String sql = "update 老师基本信息表 set course=? where teacherid=?";
                    PreparedStatement pstmt = connection.prepareStatement(sql);
                    pstmt.setString(1, lesson);
                    pstmt.setString(2, id);
                    pstmt.executeUpdate();
                    int number=returnNumber(lesson);
                    coursenumber=number;

                } catch (SQLException ex) {
                }
            }
        });

        textField_pos.setFont(new Font("", Font.BOLD, 22));
        textField_tea.setFont(new Font("", Font.BOLD, 22));
        textField_account.setFont(new Font("", Font.BOLD, 22));
        submit.setFont(new Font("", Font.BOLD, 22));
        Return.setFont(new Font("", Font.BOLD, 22));
        panel.add(L_account);
        panel.add(textField_account);
        panel.add(L_pos);
        panel.add(textField_pos);
        panel.add(L_tea);
        panel.add(textField_tea);
        panel.add(L_choose);
        panel.add(comboBox);
        panel.add(submit);
        panel.add(Return);
        teacherView.add(panel);
        teacherView.setVisible(true);
        getInformation();
        function();
    }

    public void getInformation() {
        try {
            PreparedStatement stmt = null;
            String sql = "select * from 老师基本信息表 where teacherid=?";
            stmt = connection.prepareStatement(sql);
            stmt.setString(1, id);
            result = stmt.executeQuery();
            System.out.println(result);
            if (result.next()) {
                textField_account.setText(result.getString(1));
                textField_tea.setText(result.getString(3));
                textField_pos.setText(result.getString(2));
            }
        } catch (Exception eee) {
        }
    }
    public int returnNumber(String course){
        if(course.equals("汇编语言"))
            return 4;
        else if(course.equals("大数据技术"))
            return 1;
        else if(course.equals("算法分析与设计"))
            return 2;
        else if(course.equals("Kotlin语言"))
            return 3;
        else
            return 0;
    }
    public String returnCourse(){
        try{
            String sql = "select course from 老师基本信息表 where teacherid = ?";
            System.out.println("1");
            PreparedStatement stmt1= connection.prepareStatement(sql);
            System.out.println("1");
            stmt1.setString(1, id);
            System.out.println(id);
            ResultSet resultSet= stmt1.executeQuery();
            if(resultSet.next()){
                return resultSet.getString(1);
            }
            return "无";
        }catch (Exception e){
            return "无";
        }
    }

    public void function() {
        submit.addActionListener(new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    id = textField_account.getText();
                    name = textField_tea.getText();
                    pos = textField_pos.getText();
                    String sql = "update 老师基本信息表 set name=?,position=? where teacherid=?";//
                    PreparedStatement pstmt = connection.prepareStatement(sql);
                    pstmt.setString(1, name);
                    pstmt.setString(2, pos);
                    pstmt.setString(3, id);
                    int count = pstmt.executeUpdate();
                    if (count == 1) {
                        JOptionPane.showMessageDialog(teacherView, "提交成功", "Yes", JOptionPane.INFORMATION_MESSAGE);
                    }
                } catch (Exception ee) {

                }
            }
        });
        Return.addActionListener(new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                userview.setVisible(true);
                teacherView.dispose();
            }
        });
    }


}

下载链接–程序的完整包

链接: https://download.csdn.net/download/qq_21315871/85839034

数据库表格的设计

ER图

Score表

studentregister

teacherregister

课程与成绩关系表

老师基本信息表

学生基本信息表

系统功能和实现

由于该程序的一切都是在连接数据库的基础上实现的，所以我们组使用了阿里云的云服务器进行配置mysql服务器。（服务器的配置不是本人做就不过多介绍），同时java运行环境啊，服务器的运行环境啊，jdbc包这些就这里就不过多赘述了。

部分页面截图

详细实验报告介绍

链接: https://download.csdn.net/download/qq_21315871/85839115

心得

该程序还是比较烂的，此博文只是来记录一下自己实验周做过的事情哈哈哈。自己编写的时候也借鉴了很多资料和很多内容。