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