关于com.mysql.jdbc.driver和com.mysql.cj.jdbc.driver

当前的项目用的是springboot2.1.6，之前一直是拿一个模板改来改去，今天新建了个项目发现application.properties写数据库配置时，报了个错，如图：

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.

最开始不知道为啥，反正按照提示改了就行了，后来查过了才知道跟mysql的驱动器有关系，之前一直用的是mysql-connector-java 5的版本，原来从6开始驱动类就要用com.mysql.cj.jdbc.driver，旧的已经停用了，旧的只限于用于class.forName("")中向后兼容，源码如下：

/**
 * Backwards compatibility to support apps that call <code>Class.forName("com.mysql.jdbc.Driver");</code>.
 */
public class Driver extends com.mysql.cj.jdbc.Driver {
    public Driver() throws SQLException {
        super();
    }

    static {
        System.err.println("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.");
    }
}

嗯，就这样