请用Java编程：利用GUI界面实现数据库数据的CRUD增查改删功能

好的，以下是一个简单的Java程序，可以利用GUI界面实现数据库数据的CRUD增查改删功能。

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

public class CRUD_GUI extends JFrame implements ActionListener {
    private JTextField tfID, tfName, tfAge;
    private JButton btnAdd, btnSearch, btnUpdate, btnDelete;
    private JTextArea taOutput;

    // 数据库连接信息
    private String url = "jdbc:mysql://localhost:3306/test";
    private String user = "root";
    private String password = "123456";
    private Connection conn;

    public CRUD_GUI() {
        super("CRUD GUI");

        // 创建GUI界面元素
        tfID = new JTextField(10);
        tfName = new JTextField(10);
        tfAge = new JTextField(10);
        btnAdd = new JButton("Add");
        btnSearch = new JButton("Search");
        btnUpdate = new JButton("Update");
        btnDelete = new JButton("Delete");
        taOutput = new JTextArea(10, 30);

        // 添加事件监听器
        btnAdd.addActionListener(this);
        btnSearch.addActionListener(this);
        btnUpdate.addActionListener(this);
        btnDelete.addActionListener(this);

        // 创建面板
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(5, 2));
        panel.add(new JLabel("ID:"));
        panel.add(tfID);
        panel.add(new JLabel("Name:"));
        panel.add(tfName);
        panel.add(new JLabel("Age:"));
        panel.add(tfAge);
        panel.add(btnAdd);
        panel.add(btnSearch);
        panel.add(btnUpdate);
        panel.add(btnDelete);

        // 添加面板和文本区域到窗口中
        Container contentPane = getContentPane();
        contentPane.add(panel, BorderLayout.NORTH);
        contentPane.add(new JScrollPane(taOutput), BorderLayout.CENTER);

        // 连接数据库
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(url, user, password);
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }
    }

    // 处理按钮事件
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btnAdd) {
            addRecord();
        } else if (e.getSource() == btnSearch) {
            searchRecord();
        } else if (e.getSource() == btnUpdate) {
            updateRecord();
        } else if (e.getSource() == btnDelete) {
            deleteRecord();
        }
    }

    // 添加记录到数据库中
    private void addRecord() {
        String id = tfID.getText().trim();
        String name = tfName.getText().trim();
        String age = tfAge.getText().trim();
        try {
            Statement stmt = conn.createStatement();
            String sql = "INSERT INTO person (id, name, age) VALUES ('" + id + "', '" + name + "', '" + age + "')";
            stmt.executeUpdate(sql);
            taOutput.setText("Record added successfully.");
        } catch (Exception e) {
            e.printStackTrace();
            taOutput.setText("Error adding record.");
        }
    }

    // 根据ID查询记录
    private void searchRecord() {
        String id = tfID.getText().trim();
        try {
            Statement stmt = conn.createStatement();
            String sql = "SELECT * FROM person WHERE id='" + id + "'";
            ResultSet rs = stmt.executeQuery(sql);
            if (rs.next()) {
                String name = rs.getString("name");
                String age = rs.getString("age");
                tfName.setText(name);
                tfAge.setText(age);
                taOutput.setText("Record found.");
            } else {
                taOutput.setText("Record not found.");
            }
        } catch (Exception e) {
            e.printStackTrace();
            taOutput.setText("Error searching record.");
        }
    }

    // 根据ID更新记录
    private void updateRecord() {
        String id = tfID.getText().trim();
        String name = tfName.getText().trim();
        String age = tfAge.getText().trim();
        try {
            Statement stmt = conn.createStatement();
            String sql = "UPDATE person SET name='" + name + "', age='" + age + "' WHERE id='" + id + "'";
            int rows = stmt.executeUpdate(sql);
            if (rows == 1) {
                taOutput.setText("Record updated successfully.");
            } else {
                taOutput.setText("Record not found.");
            }
        } catch (Exception e) {
            e.printStackTrace();
            taOutput.setText("Error updating record.");
        }
    }

    // 根据ID删除记录
    private void deleteRecord() {
        String id = tfID.getText().trim();
        try {
            Statement stmt = conn.createStatement();
            String sql = "DELETE FROM person WHERE id='" + id + "'";
            int rows = stmt.executeUpdate(sql);
            if (rows == 1) {
                tfName.setText("");
                tfAge.setText("");
                taOutput.setText("Record deleted successfully.");
            } else {
                taOutput.setText("Record not found.");
            }
        } catch (Exception e) {
            e.printStackTrace();
            taOutput.setText("Error deleting record.");
        }
    }

    public static void main(String[] args) {
        CRUD_GUI frame = new CRUD_GUI();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}

在这个程序中，我们使用了Java的GUI界面工具包Swing来创建界面元素，并使用MySQL数据库来存储数据。程序中包含了四个按钮，分别用于添加记录、查询记录、更新记录和删除记录。当用户点击这些按钮时，程序会执行相应的操作并将结果输出到文本区域中。

需要注意的是，这个程序仅仅是一个演示，没有考虑到实际应用场景中的安全性和稳定性问题。在实际开发中，需要更加严谨地处理用户输入和异常情况，以确保系统的安全和稳定。