ResourceBundle 和 Properties 读取Properties文件注意

 ResourceBundle rb = ResourceBundle.getBundle("dbcfg");
            driverClass = rb.getString("driverClass");
            System.out.println(driverClass);
            url = rb.getString("url");
            user = rb.getString("user");
            password = rb.getString("password");

InputStream in = JdbcUtils.class.getClassLoader().getResourceAsStream("dbcfg.properties");
            Properties pro = new Properties();
            pro.load(in);
            driverClass = pro.getProperty("driverClass");
            url = pro.getProperty("url");
            user = pro.getProperty("user");
            password = pro.getProperty("password");

注意这两个用法的区别，一个直接用名字不带后缀名，一个要带后缀名