MYSQL Establishing SSL connection without server's identity verification is not recommended.

在跑web项目的时候 数据库的链接出现这个问题

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.Wed Aug 23 14:10:44 CST 2017

解决的方法

<property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/test"/>
将上面那句话 改成下面这句话 
<property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf-8&amp;useSSL=true"/>