我已经连接上数据库，请你编写一个java gui实现学生信息管理系统的前端页面

好的，以下是一个简单的Java GUI实现学生信息管理系统的前端页面的示例代码，它使用了Swing库来创建GUI界面：

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

public class StudentManagementSystem extends JFrame {

    private static final String DB_URL = "jdbc:mysql://localhost:3306/student_db";
    private static final String DB_USERNAME = "root";
    private static final String DB_PASSWORD = "your_password";

    private Connection conn;
    private PreparedStatement stmt;
    private ResultSet rs;

    private JLabel nameLabel = new JLabel("Name:");
    private JLabel ageLabel = new JLabel("Age:");
    private JLabel genderLabel = new JLabel("Gender:");

    private JTextField nameField = new JTextField(20);
    private JTextField ageField = new JTextField(20);
    private JRadioButton maleButton = new JRadioButton("Male");
    private JRadioButton femaleButton = new JRadioButton("Female");
    private ButtonGroup genderButtonGroup = new ButtonGroup();

    private JButton addButton = new JButton("Add");
    private JButton deleteButton = new JButton("Delete");
    private JButton updateButton = new JButton("Update");

    public StudentManagementSystem() {
        setTitle("Student Management System");
        setSize(400, 300);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel mainPanel = new JPanel(new GridLayout(4, 2, 5, 5));

        mainPanel.add(nameLabel);
        mainPanel.add(nameField);
        mainPanel.add(ageLabel);
        mainPanel.add(ageField);
        mainPanel.add(genderLabel);
        genderButtonGroup.add(maleButton);
        genderButtonGroup.add(femaleButton);
        mainPanel.add(maleButton);
        mainPanel.add(femaleButton);

        JPanel buttonPanel = new JPanel(new FlowLayout());
        buttonPanel.add(addButton);
        buttonPanel.add(deleteButton);
        buttonPanel.add(updateButton);

        add(mainPanel, BorderLayout.CENTER);
        add(buttonPanel, BorderLayout.SOUTH);

        addButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                addStudent();
            }
        });

        deleteButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                deleteStudent();
            }
        });

        updateButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                updateStudent();
            }
        });

        try {
            // 连接数据库
            conn = DriverManager.getConnection(DB_URL, DB_USERNAME, DB_PASSWORD);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    private void addStudent() {
        String name = nameField.getText();
        int age = Integer.parseInt(ageField.getText());
        String gender = maleButton.isSelected() ? "Male" : "Female";

        try {
            // 执行插入语句
            stmt = conn.prepareStatement("INSERT INTO student(name, age, gender) VALUES(?, ?, ?)");
            stmt.setString(1, name);
            stmt.setInt(2, age);
            stmt.setString(3, gender);
            stmt.executeUpdate();

            JOptionPane.showMessageDialog(this, "Student added successfully");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    private void deleteStudent() {
        String name = nameField.getText();

        try {
            // 执行删除语句
            stmt = conn.prepareStatement("DELETE FROM student WHERE name = ?");
            stmt.setString(1, name);
            stmt.executeUpdate();

            JOptionPane.showMessageDialog(this, "Student deleted successfully");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    private void updateStudent() {
        String name = nameField.getText();
        int age = Integer.parseInt(ageField.getText());
        String gender = maleButton.isSelected() ? "Male" : "Female";

        try {
            // 执行更新语句
            stmt = conn.prepareStatement("UPDATE student SET age = ?, gender = ? WHERE name = ?");
            stmt.setInt(1, age);
            stmt.setString(2, gender);
            stmt.setString(3, name);
            stmt.executeUpdate();

            JOptionPane.showMessageDialog(this, "Student updated successfully");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        StudentManagementSystem sms = new StudentManagementSystem();
        sms.setVisible(true);
    }
}

在上面的代码中，我们使用了JDBC来连接MySQL数据库，并在GUI界面中添加了三个按钮（添加、删除和更新）以及必要的文本框和单选按钮。当用户点击相应的按钮时，我们会执行相应的数据库操作，例如插入、删除或更新数据。请注意，这只是一个非常简单的示例，实际的学生信息管理系统可能需要更复杂和完整的功能。