mysql java连接配置文件

jdbc.url=jdbc:mysql://localhost:3306/mydatabase
jdbc.username=root
jdbc.password=root

import java.io.FileInputStream;
import java.io.IOException;
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) {
        Connection connection = null;
        Properties properties = new Properties();
        try (FileInputStream fileInputStream = new FileInputStream("db.properties")) {
            properties.load(fileInputStream);
            String url = properties.getProperty("jdbc.url");
            String username = properties.getProperty("jdbc.username");
            String password = properties.getProperty("jdbc.password");

            connection = DriverManager.getConnection(url, username, password);
            System.out.println("Connected to the database!");
        } catch (IOException | SQLException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                try {
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}