mybatis中jdbc连接MySQL时警告：Establishing SSL connection without server's identity verification is not rec

1. 问题
   在eclipse开发Java项目中使用JDBC连接Mysql时出现下面警告：

   Sun Sep 23 11:23:59 CST 2018 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.
   是在没有服务器身份验证的情况下建立SSL连接的问题。

2. 原因及解决方法
   是MySQL在高版本需要指明是否进行SSL连接。
   在连接mysql的配置文件中加入ssl=true或者false即可：
   property name=“url” value=“jdbc:mysql://localhost:3306/mybatis?useSSL=false”