如何在系统默认时区将MySQL DATETIME转换为java.time.Instant并显示给用户？

import java.sql.*;
import java.time.*;
import java.time.format.DateTimeFormatter;

public class Main {
    public static void main(String[] args) {
        // JDBC连接MySQL数据库
        String url = "jdbc:mysql://localhost:3306/database_name";
        String username = "username";
        String password = "password";
        
        try (Connection connection = DriverManager.getConnection(url, username, password)) {
            // 执行查询语句
            String query = "SELECT datetime_column FROM table_name";
            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery(query);
            
            // 获取DATETIME类型的数据并转换为Instant对象
            while (resultSet.next()) {
                Timestamp timestamp = resultSet.getTimestamp("datetime_column");
                LocalDateTime localDateTime = timestamp.toLocalDateTime();
                Instant instant = localDateTime.toInstant(ZoneOffset.systemDefault().getRules().getOffset(Instant.now()));
                
                // 将Instant对象显示给用户
                DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
                String formattedDateTime = formatter.format(instant);
                System.out.println(formattedDateTime);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}