MySQL的版本过高与mysql-connection-java-5.1.18不匹配，换成5.1.46匹配成功，改了jar包的同时，要在连接处加上
Sat May 18 16:43:41 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.