mysql jdbc配置文件

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;

public class MySQLConnection {
    public static void main(String[] args) {
        Properties props = new Properties();
        try (InputStream in = MySQLConnection.class.getResourceAsStream("/db.properties")) {
            props.load(in);
            String url = props.getProperty("jdbc.url");
            String user = props.getProperty("jdbc.username");
            String password = props.getProperty("jdbc.password");

            Connection conn = DriverManager.getConnection(url, user, password);
            System.out.println("Connected to the database!");
            conn.close();
        } catch (IOException | SQLException e) {
            e.printStackTrace();
        }
    }
}

jdbc.driverClassName=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mydatabase
jdbc.username=myuser
jdbc.password=mypassword