java: MySql Connection using JDK 14.02

/*
 * 版权所有 2021 涂聚文有限公司
 * 许可信息查看：
 * 描述：
 *
 * 历史版本： JDK 14.02
 * 2021-12-12 创建者 geovindu
 * 2021-12-15 添加 Lambda
 * 2021-12-15 修改：date
 * 接口类 mysql-connector-java-8.0.27.jar.
 * 数据库：MySQL Server 8.0
 * 2021-12-15 修改者：Geovin Du
 * 生成API帮助文档的指令：
 *javadoc - -encoding Utf-8 -d apidoc DuMysqlCon.java
 *
 * */
 
 
 
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.*;
 
 
 
public class DuMysqlCon {
 
    Connection con;
    Statement stmt = null;
    //
    public Connection getConnection() {
        try {
            Class.forName("com.mysql.cj.jdbc.Driver"); //com.mysql.cj.jdbc.Driver  com.mysql.jdbc.Driver访问需要相应的JAR版本，在安装的数据库下拷贝来引用
            System.out.println("数据库驱动加载成功");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        try {
            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sakila?characterEncoding=UTF-8", "root", "7涂聚文");
 
            System.out.println("数据库连接成功");
            System.out.println(" 实例化Statement对象...");       // 执行查询
            stmt = con.createStatement();
            String sql;
            sql = "SELECT city_id,city,country_id  FROM city";
            ResultSet rs = stmt.executeQuery(sql);
 
            // 展开结果集数据库
            while(rs.next()){
                // 通过字段检索
                int cityid  = rs.getInt("city_id");
                String city = rs.getString("city");
                int countryid = rs.getInt("country_id");
 
                // 输出数据
                System.out.print("ID: " + cityid);
                System.out.print("  ,  城市名字: " + city);
                System.out.print("  , 区域cid: " + countryid);
                System.out.print("\n");
            }
            // 完成后关闭
            rs.close();
            stmt.close();
            con.close();
 
 
 
 
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return con;
    }
}

/*
 * 版权所有 2021 涂聚文有限公司
 * 许可信息查看：
 * 描述：
 *
 * 历史版本： JDK 14.02
 * 2021-12-12 创建者 geovindu
 * 2021-12-15 添加 Lambda
 * 2021-12-15 修改：date
 * 接口类 mysql-connector-java-8.0.27.jar
 * 数据库：MySQL Server 8.0
 * 2021-12-15 修改者：Geovin Du
 * 生成API帮助文档的指令：
 *javadoc - -encoding Utf-8 -d apidoc DuCon.java
 *
 * */
 
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import com.mysql.cj.*;
import com.mysql.jdbc.*;
import java.io.*;
import java.lang.*;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.sql.*;
 
 
 
public class DuCon {
 
 
    Connection con;
    //private static Properties duproperties;
    private static Properties  pp = null;
    private static InputStream fis = null;
    private static String url = "";
    private static String  driverName="";
    private static String user="";
    private static String password ="";
 
    public Connection getConnection() {
 
        // duproperties =new Properties();//创建资源对象
        pp = new Properties();
        try {
            fis=DuCon.class.getClassLoader().getResourceAsStream("dbinfo.properties");
            pp.load(fis);
 
            url = pp.getProperty("url");
            driverName = pp.getProperty("driverName");
            user = pp.getProperty("user");
            password = pp.getProperty("password");
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        //properties.load(new InputStreamReader(DuCon.class.getClassLoader().getResourceAsStream("dbinfo.properties"),"UTF-8"));
 
        try
        {
 
            Class.forName(driverName);
            System.out.println("数据库驱动加载成功");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
 
        try {
            con = DriverManager.getConnection(url,user,password);
            System.out.println("数据库连接成功");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return con;
    }
 
 
}

dbinfo.properties：(放在SRC文夹下)

driverName=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/sakila
user=root
password=涂聚文

/*
 * 版权所有 2021 涂聚文有限公司
 * 许可信息查看：
 * 描述：
 *
 * 历史版本： JDK 14.02
 * 2021-12-12 创建者 geovindu
 * 2021-12-15 添加 Lambda
 * 2021-12-15 修改：date
 * 接口类
 * 2021-12-15 修改者：Geovin Du
 * 生成API帮助文档的指令：
 *javadoc - -encoding Utf-8 -d apidoc DuMain.java
 *
 * */
 
 
 
 
import com.mysql.cj.*;
import com.mysql.jdbc.*;
// import com.intellij.database.*;
// import com.intellij.database.dialects.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
 
 
 
 
public class DuMain {
 
 
 
 
 
    public static void main(String[] args) {
        DuMysqlCon c = new DuMysqlCon();
        c.getConnection();
 
        DuCon cn=new DuCon();
        cn.getConnection();
 
 
    }
 
 
 
}