在集成spring与mybatis是，在spring.xml中配置了DataSource配置，数据库连接采用的是mysql的链接字符串：
jdbc:mysql://localhost:3306/world
启动项目，调用请求数据库时，输出告警信息如下：
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.
原因是MySQL在高版本需要指明是否进行SSL连接。
解决办法是在mysql连接字符串url中加入ssl=false即可，如下：
jdbc:mysql://localhost:3306/world?characterEncoding=utf8&useSSL=false
如果配置useSSL=true，则需要额外的配置。