Java创建一个JDBC工具类并解决返回ResultSet的问题

package com.JyoKou.utils;


import java.sql.*;

/**
 * 创建JDBC连接工具类
 *
 * @author JyoKou
 * @since 2022年7月7日
 */
public class JDBCUtils {
    private final Connection conn;
    private final PreparedStatement ps;

    public JDBCUtils(String driver, String url, String userName, String password, String sql) {
        try {
            Class.forName(driver);
            this.conn = DriverManager.getConnection(url, userName, password);
            this.ps = conn.prepareStatement(sql);
        } catch (Exception e) {
            e.printStackTrace();
            throw new BadRequestException(MsgConstants.MSG);
        }
    }

    /**
     * 创建JDBC连接并执行查询语句
     *
     * @return ResultSet结果集
     * @author JyoKou
     * @since 2022年7月7日
     */
    public ResultSet getQuery() {
        ResultSet rs;
        try {
            rs = this.ps.executeQuery();
        } catch (SQLException e) {
            e.printStackTrace();
            throw new BadRequestException(MsgConstants.MSG);
        }
        return rs;
    }

    /**
     * 关闭连接
     *
     * @author JyoKou
     * @since 2022年7月15日
     */
    public void close() {
        try {
            if (this.ps != null) {
                this.ps.close();
            }
            if (this.conn != null) {
                this.conn.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw new BadRequestException(MsgConstants.MSG);
        }
    }
}

public Object getDataFromDs(String connectDrivers, BaSysHomepageDatasourceEntity baSysHomepageDatasourceEntity) {
        //JDBC执行查询
        JDBCUtils jdbcUtils = new JDBCUtils(connectDrivers
            , baSysHomepageDatasourceEntity.getDataUrl()
            , baSysHomepageDatasourceEntity.getDataUserName()
            , baSysHomepageDatasourceEntity.getDataUserPwd()
            , homepageCardQueryData.getQuerySql());
        ResultSet resultSet = jdbcUtils.getQuery();
        try {
            if (resultSet.next()) {
                return resultSet.getInt("F_NUM");
            } else {
                throw new BadRequestException(MsgConstants.MSG);
            }
        } catch (SQLException e) {
            e.printStackTrace();
            throw new BadRequestException(MsgConstants.MSG);
        } finally {
            jdbcUtils.close();
        }
    }