如何模拟JdbcTemplate.queryForObject()方法

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

public class JdbcTemplateExample {
    private JdbcTemplate jdbcTemplate;

    // 构造函数注入JdbcTemplate对象
    public JdbcTemplateExample(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    public User getUserById(int id) {
        String sql = "SELECT * FROM users WHERE id = ?";
        Object[] params = {id};

        // 定义结果集映射器
        RowMapper<User> rowMapper = (rs, rowNum) -> {
            User user = new User();
            user.setId(rs.getInt("id"));
            user.setName(rs.getString("name"));
            user.setAge(rs.getInt("age"));
            return user;
        };

        // 执行查询并返回单个结果对象
        User user = jdbcTemplate.queryForObject(sql, params, rowMapper);

        return user;
    }
}