使用Java和swing和MySQL用代码写出一个大概的宿舍管理系统

好的，下面是一个大概的宿舍管理系统的Java代码示例，使用了Java Swing和MySQL：

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

public class DormitoryManagementSystem extends JFrame implements ActionListener {
    JPanel panel;
    JLabel user_label, password_label, message;
    JTextField userName_text;
    JPasswordField password_text;
    JButton submit, cancel;

    DormitoryManagementSystem() {
        user_label = new JLabel();
        user_label.setText("用户名：");
        userName_text = new JTextField();

        password_label = new JLabel();
        password_label.setText("密码：");
        password_text = new JPasswordField();

        submit = new JButton("登录");
        cancel = new JButton("取消");

        panel = new JPanel(new GridLayout(3, 1));
        panel.add(user_label);
        panel.add(userName_text);
        panel.add(password_label);
        panel.add(password_text);
        message = new JLabel();
        panel.add(message);
        panel.add(submit);
        panel.add(cancel);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // 设置窗体大小
        setSize(500, 500);
        panel.setBackground(Color.LIGHT_GRAY);

        add(panel, BorderLayout.CENTER);
        // 设置标题
        setTitle("宿舍管理系统");
        setVisible(true);
        setLocationRelativeTo(null);
        submit.addActionListener(this);
        cancel.addActionListener(this);
    }

    public static void main(String[] args) {
        new DormitoryManagementSystem();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String userName = userName_text.getText();
        String password = password_text.getText();

        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/dormitory_management_system", "root", "123456");

            PreparedStatement st = con.prepareStatement("select * from users where username=? and password=?");

            st.setString(1, userName);
            st.setString(2, password);
            ResultSet rs = st.executeQuery();

            if (rs.next()) {
                message.setText("登录成功！");
                this.dispose();
                new Dashboard();
            } else {
                message.setText("用户名或密码错误！");
            }

            rs.close();
            st.close();
            con.close();
        } catch (Exception ex) {
            System.out.println(ex);
        }
    }

    class Dashboard extends JFrame implements ActionListener {
        JMenuBar menuBar;
        JMenu menu1, menu2, menu3;
        JMenuItem menuItem1, menuItem2, menuItem3, menuItem4, menuItem5, menuItem6, menuItem7, menuItem8,
                menuItem9;

        Dashboard() {
            menuBar = new JMenuBar();
            menu1 = new JMenu("系统管理");
            menuItem1 = new JMenuItem("用户管理");
            menuItem1.addActionListener(this);
            menuItem2 = new JMenuItem("角色管理");
            menuItem2.addActionListener(this);
            menuItem3 = new JMenuItem("权限管理");
            menuItem3.addActionListener(this);
            menu1.add(menuItem1);
            menu1.add(menuItem2);
            menu1.add(menuItem3);

            menu2 = new JMenu("学生管理");
            menuItem4 = new JMenuItem("学生信息管理");
            menuItem4.addActionListener(this);
            menuItem5 = new JMenuItem("学生入住管理");
            menuItem5.addActionListener(this);
            menuItem6 = new JMenuItem("学生缺寝管理");
            menuItem6.addActionListener(this);
            menu2.add(menuItem4);
            menu2.add(menuItem5);
            menu2.add(menuItem6);

            menu3 = new JMenu("宿舍管理");
            menuItem7 = new JMenuItem("宿舍楼信息管理");
            menuItem7.addActionListener(this);
            menuItem8 = new JMenuItem("宿舍信息管理");
            menuItem8.addActionListener(this);
            menuItem9 = new JMenuItem("统计报表");
            menuItem9.addActionListener(this);
            menu3.add(menuItem7);
            menu3.add(menuItem8);
            menu3.add(menuItem9);

            menuBar.add(menu1);
            menuBar.add(menu2);
            menuBar.add(menu3);
            setJMenuBar(menuBar);

            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setSize(500, 500);
            setTitle("宿舍管理系统");
            setVisible(true);
            setLocationRelativeTo(null);
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            if (e.getSource() == menuItem1) {
                new UserManagement();
            } else if (e.getSource() == menuItem2) {
                new RoleManagement();
            } else if (e.getSource() == menuItem3) {
                new PermissionManagement();
            } else if (e.getSource() == menuItem4) {
                new StudentInformationManagement();
            } else if (e.getSource() == menuItem5) {
                new StudentAccommodationManagement();
            } else if (e.getSource() == menuItem6) {
                new StudentAbsenteeismManagement();
            } else if (e.getSource() == menuItem7) {
                new DormitoryBuildingInformationManagement();
            } else if (e.getSource() == menuItem8) {
                new DormitoryInformationManagement();
            } else if (e.getSource() == menuItem9) {
                new ReportManagement();
            }
        }
    }

    class UserManagement extends JFrame {
        UserManagement() {
            // 用户管理界面代码
        }
    }

    class RoleManagement extends JFrame {
        RoleManagement() {
            // 角色管理界面代码
        }
    }

    class PermissionManagement extends JFrame {
        PermissionManagement() {
            // 权限管理界面代码
        }
    }

    class StudentInformationManagement extends JFrame {
        StudentInformationManagement() {
            // 学生信息管理界面代码
        }
    }

    class StudentAccommodationManagement extends JFrame {
        StudentAccommodationManagement() {
            // 学生入住管理界面代码
        }
    }

    class StudentAbsenteeismManagement extends JFrame {
        StudentAbsenteeismManagement() {
            // 学生缺寝管理界面代码
        }
    }

    class DormitoryBuildingInformationManagement extends JFrame {
        DormitoryBuildingInformationManagement() {
            // 宿舍楼信息管理界面代码
        }
    }

    class DormitoryInformationManagement extends JFrame {
        DormitoryInformationManagement() {
            // 宿舍信息管理界面代码
        }
    }

    class ReportManagement extends JFrame {
        ReportManagement() {
            // 统计报表界面代码
        }
    }
}

上述代码仅为示例，具体实现细节和代码实现需要根据具体需求进行开发。