Java:如何通过列名检索SQL resultSet数据？

import java.sql.*;

public class RetrieveDataByColumnName {
    public static void main(String[] args) {
        try {
            // 建立数据库连接
            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 执行SQL查询语句
            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery("SELECT * FROM mytable");

            // 获取列索引
            int ageColumnIndex = resultSet.findColumn("age");

            // 遍历结果集
            while (resultSet.next()) {
                // 通过列索引获取列值
                int ageValue = resultSet.getInt(ageColumnIndex);
                System.out.println("Age: " + ageValue);
            }

            // 关闭连接
            resultSet.close();
            statement.close();
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}