用java写一个复杂的学生信息管理系统

为了实现一个复杂的学生信息管理系统，需要考虑以下几个方面：

1. 数据库设计：需要设计一个合适的数据库来存储学生信息，包括学生姓名、学号、班级、课程成绩等信息。

2. 用户登录：需要实现一个登录界面，根据用户输入的用户名和密码来验证用户身份，并根据用户权限跳转到不同的界面。

3. 学生信息管理：需要实现对学生信息的增删改查功能，包括添加学生信息、删除学生信息、修改学生信息和查询学生信息等。

4. 成绩管理：需要实现对学生成绩的管理，包括添加成绩、删除成绩、修改成绩和查询成绩等。

5. 图形化界面：需要使用Java Swing等图形化界面组件来实现一个美观易用的界面，包括表格显示学生信息和成绩信息等。

以下是一个简单的Java学生信息管理系统的代码示例，仅供参考：

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

public class StudentManagementSystem extends JFrame implements ActionListener {
    private JLabel titleLabel, nameLabel, idLabel, classLabel, scoreLabel;
    private JTextField nameField, idField, classField, scoreField;
    private JButton addButton, deleteButton, updateButton, searchButton;
    private JTable table;
    private DefaultTableModel model;

    public StudentManagementSystem() {
        super("学生信息管理系统");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        // 标题
        titleLabel = new JLabel("学生信息管理系统", JLabel.CENTER);
        titleLabel.setFont(new Font("宋体", Font.BOLD, 24));
        add(titleLabel, BorderLayout.NORTH);

        // 表格
        model = new DefaultTableModel();
        model.addColumn("姓名");
        model.addColumn("学号");
        model.addColumn("班级");
        model.addColumn("成绩");
        table = new JTable(model);
        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane, BorderLayout.CENTER);

        // 输入框和按钮
        JPanel inputPanel = new JPanel(new GridLayout(5, 2));
        nameLabel = new JLabel("姓名：");
        nameField = new JTextField();
        idLabel = new JLabel("学号：");
        idField = new JTextField();
        classLabel = new JLabel("班级：");
        classField = new JTextField();
        scoreLabel = new JLabel("成绩：");
        scoreField = new JTextField();
        addButton = new JButton("添加");
        addButton.addActionListener(this);
        deleteButton = new JButton("删除");
        deleteButton.addActionListener(this);
        updateButton = new JButton("修改");
        updateButton.addActionListener(this);
        searchButton = new JButton("查询");
        searchButton.addActionListener(this);
        inputPanel.add(nameLabel);
        inputPanel.add(nameField);
        inputPanel.add(idLabel);
        inputPanel.add(idField);
        inputPanel.add(classLabel);
        inputPanel.add(classField);
        inputPanel.add(scoreLabel);
        inputPanel.add(scoreField);
        inputPanel.add(addButton);
        inputPanel.add(deleteButton);
        inputPanel.add(updateButton);
        inputPanel.add(searchButton);
        add(inputPanel, BorderLayout.SOUTH);

        // 窗口大小和位置
        setSize(600, 400);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == addButton) {
            // 添加学生信息
            String name = nameField.getText();
            String id = idField.getText();
            String className = classField.getText();
            String score = scoreField.getText();
            if (name.equals("") || id.equals("") || className.equals("") || score.equals("")) {
                JOptionPane.showMessageDialog(this, "请输入完整信息");
                return;
            }
            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student", "root", "123456");
                Statement stmt = conn.createStatement();
                String sql = "INSERT INTO student_info (name, id, class, score) VALUES ('" + name + "', '" + id + "', '" + className + "', '" + score + "')";
                stmt.executeUpdate(sql);
                stmt.close();
                conn.close();
                JOptionPane.showMessageDialog(this, "添加成功");
                nameField.setText("");
                idField.setText("");
                classField.setText("");
                scoreField.setText("");
                updateTable();
            } catch (Exception ex) {
                ex.printStackTrace();
                JOptionPane.showMessageDialog(this, "添加失败");
            }
        } else if (e.getSource() == deleteButton) {
            // 删除学生信息
            int row = table.getSelectedRow();
            if (row == -1) {
                JOptionPane.showMessageDialog(this, "请选择要删除的行");
                return;
            }
            String id = (String) model.getValueAt(row, 1);
            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student", "root", "123456");
                Statement stmt = conn.createStatement();
                String sql = "DELETE FROM student_info WHERE id='" + id + "'";
                stmt.executeUpdate(sql);
                stmt.close();
                conn.close();
                JOptionPane.showMessageDialog(this, "删除成功");
                updateTable();
            } catch (Exception ex) {
                ex.printStackTrace();
                JOptionPane.showMessageDialog(this, "删除失败");
            }
        } else if (e.getSource() == updateButton) {
            // 修改学生信息
            int row = table.getSelectedRow();
            if (row == -1) {
                JOptionPane.showMessageDialog(this, "请选择要修改的行");
                return;
            }
            String id = (String) model.getValueAt(row, 1);
            String name = nameField.getText();
            String className = classField.getText();
            String score = scoreField.getText();
            if (name.equals("") || className.equals("") || score.equals("")) {
                JOptionPane.showMessageDialog(this, "请输入完整信息");
                return;
            }
            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student", "root", "123456");
                Statement stmt = conn.createStatement();
                String sql = "UPDATE student_info SET name='" + name + "', class='" + className + "', score='" + score + "' WHERE id='" + id + "'";
                stmt.executeUpdate(sql);
                stmt.close();
                conn.close();
                JOptionPane.showMessageDialog(this, "修改成功");
                nameField.setText("");
                idField.setText("");
                classField.setText("");
                scoreField.setText("");
                updateTable();
            } catch (Exception ex) {
                ex.printStackTrace();
                JOptionPane.showMessageDialog(this, "修改失败");
            }
        } else if (e.getSource() == searchButton) {
            // 查询学生信息
            String id = idField.getText();
            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student", "root", "123456");
                Statement stmt = conn.createStatement();
                String sql = "SELECT * FROM student_info WHERE id='" + id + "'";
                ResultSet rs = stmt.executeQuery(sql);
                if (rs.next()) {
                    nameField.setText(rs.getString("name"));
                    classField.setText(rs.getString("class"));
                    scoreField.setText(rs.getString("score"));
                } else {
                    JOptionPane.showMessageDialog(this, "未找到该学生信息");
                }
                rs.close();
                stmt.close();
                conn.close();
            } catch (Exception ex) {
                ex.printStackTrace();
                JOptionPane.showMessageDialog(this, "查询失败");
            }
        }
    }

    private void updateTable() {
        // 更新表格数据
        model.setRowCount(0);
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student", "root", "123456");
            Statement stmt = conn.createStatement();
            String sql = "SELECT * FROM student_info";
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                String name = rs.getString("name");
                String id = rs.getString("id");
                String className = rs.getString("class");
                String score = rs.getString("score");
                model.addRow(new Object[] { name, id, className, score });
            }
            rs.close();
            stmt.close();
            conn.close();
        } catch (Exception ex) {
            ex.printStackTrace();
            JOptionPane.showMessageDialog(this, "更新表格失败");
        }
    }

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