原因是少了时区，加&serverTimezone=UTC
jdbc:mysql://127.0.0.1:3306/my_test?useUnicode=true&characterEncoding=utf-8&autoReconnect=true&useSSL=false&serverTimezone=UTC jdbc:mysql://127.0.0.
阅读背景：
【mysql】【springboot】启动报错Could not create connection to database server. Attempted reconnect 3 times. Giving up
来源：互联网
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