java 基於外部配置文件 連接mysql

String driverClass = null;
String jdbcUrl = null;
String user = null;
String password = null;
InputStream inputStream =
        getClass().getClassLoader().getResourceAsStream("jdbc.properties");//讀取外部配置文件 輸入流
Properties properties = new Properties();
properties.load(inputStream);
driverClass =   properties.getProperty("driver");
jdbcUrl = properties.getProperty("jdbcUrl");
user = properties.getProperty("user");
password = properties.getProperty("password");
Driver driver = (Driver)Class.forName(driverClass).newInstance();//經過反射實例化Driver
Properties info = new Properties();
info.put("user", user);
info.put("password", password);
Connection connection = driver.connect(jdbcUrl, info);
return connection;