错误 Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
原因： **This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'.**
解决： com.mysql.jdbc.Driver 已经过时了，使用新的驱动 com.mysql.cj.jdbc.Driver
