在高版本的数据库连接的时候会出现警告
Tue Apr 09 13:53:13 CST 2019 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
翻译的大体意思就是
警告:在没有SSL连接的情况下建立SSL连接不建议使用服务器的身份验证。根据MySQL5.5.45+、5.6.26+和5.7.6+要求必须建立SSL连接默认情况下，如果没有设置显式选项不使用SSL的应用程序将verifyServerCertificate属性设置为“false”。您需要通过设置useSSL=false显式禁用SSL，或设置useSSL=true，并为服务器证书提供信任存储验证
解决办法：在mysql连接的url后加上&useSSL=true
示例：jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true