mysql连接报“Communications link failure”错误

见博客：https://blog.csdn.net/qq_27471405/article/details/80921846

 我是端口号弄错了，老师给的3306端口我删了一个3成了306端口，改回来之后报错：异常：java.sql.SQLException: The server time zone value '?й???????' is unrecognized or represents more

链接如下：

https://www.cnblogs.com/whcai/p/14101199.html