【警告】WARN: Establishing SSL connection without server's identity verification is not recommended.

1.Java访问Mysql时出现如下警告：

2019-04-02 10:30:50.545  INFO 1290 --- [nio-8080-exec-1] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
Tue Apr 02 10:30:50 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.

不建议不使用服务器身份验证建立SSL连接，必须默认建立SSL连接。

2.解决办法

在mysql url后加入useSSL=false参数就可以 了

url=jdbc:mysql://localhost:3306/daotable?useSSL=false