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操作数据库时提示如下
WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
大意是：面对高版本的MySQL，推荐在数据库连接url中使用SSL（安全套接字层，是为网络通信提供安全及数据完整性的一种安全协议，SSL在传输层对网络连接进行加密)。
即表示 useSSL=true/false
jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&characterEncoding=UTF-8&useSSL=false