mysql连接失败Could not create connection to database server. Attempted reconnect 3 times. Giving up.

解决方法：

加一个参数：

serverTimezone=UTC
jdbc:mysql://127.0.0.1:3306/springboot-dubbo01?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&serverTimezone=UTC