连接JDBC报错:com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.

问题：
Spring整合Mybatis时候，出现数据库连接异常：

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

分析：

找了好半天的原因，最后发现是相关jdbc驱动包版本太低！

解决方法：

下载最新版的mysql-connector-java即可。
虽然可以连接成功，但是控制台还是提示：

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.

修改一下mybatis-config.xml：

<!--<property name="driver" value="com.mysql.jdbc.Driver"/>-->
<property name="driver" value="com.mysql.cj.jdbc.Driver"/>