如何在spring JDBCTemplate中进行类型转换？

public class UserRowMapper implements RowMapper<User> {
    @Override
    public User mapRow(ResultSet rs, int rowNum) throws SQLException {
        User user = new User();
        user.setId(rs.getInt("id"));
        user.setName(rs.getString("name"));
        user.setAge(rs.getInt("age"));
        return user;
    }
}

List<User> users = jdbcTemplate.query("SELECT * FROM users", new UserRowMapper());

public class UserResultSetExtractor implements ResultSetExtractor<User> {
    @Override
    public User extractData(ResultSet rs) throws SQLException, DataAccessException {
        if (rs.next()) {
            User user = new User();
            user.setId(rs.getInt("id"));
            user.setName(rs.getString("name"));
            user.setAge(rs.getInt("age"));
            return user;
        }
        return null;
    }
}

User user = jdbcTemplate.query("SELECT * FROM users WHERE id = ?", new UserResultSetExtractor(), userId);