Loading class com.mysql.jdbc.Driver'. This is deprecated. The new driver class iscom.mysql.cj.jdbc.Driver’. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
原因： mysql 8会提示这个警告，不影响使用。 解决方法： 在项目的配置文件搜索com.mysql.jdbc.Driver，修改成com.mysql.cj.jdbc.Driver。
