⽤idea连接mysql时，出现.NullPointerException异常这是⼯具类：
private static String driver = null;
private static String url = null;
private static String username = null;
private static String password = null;
static{
mysql下载出现installertry{
InputStream in = ClassLoader().getResourceAsStream("db.properties");
Properties properties = new Properties();
properties.load(in);
driver = Property("name");
url = Property("url");
username = Property("username");
password = Property("password");
//1.驱动只⽤加载⼀次

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