DriverManager 获取数据库链接

//基于DriverManager 的获取数据库链接
String user = null;
String password = null;
String jdbcUrl = null;
String driverClass = null;
//获取配置文件
InputStream inputStream
        = getClass().getClassLoader().getResourceAsStream("jdbc.properties");
//读取文件
Properties properties = new Properties();
properties.load(inputStream);//载入文件
user = properties.getProperty("user");
password = properties.getProperty("password");
jdbcUrl = properties.getProperty("jdbcUrl");
driverClass = properties.getProperty("driver");
//注册数据库驱动程序员
Class.forName(driverClass);
Connection connection = DriverManager.getConnection(jdbcUrl, user, password);
return connection;