你的mysql数据库连不上

Wed Apr 24 17:24:17 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.
java.sql.SQLException: Client does not support authentication protocol requested by server; consider upgrading MySQL client

老师  这个是啥原因呢？  还是出不来

这是你安装的数据库出现的问题，不是代码出现的问题，参考网友的文章进行处理

https://blog.csdn.net/u013700358/article/details/80306560