com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

修改数据库配置信息：

<property name="url" value="jdbc:mysql://localhost:3306/mybatisdb?useSSL=false&amp;serverTimezone=Asia/Shanghai
&amp;zeroDateTimeBehavior=CONVERT_TO_NULL
&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>