连接数据库报错The last packet sent successfully to the server was 0 milliseconds ago. The driver has not re

mysql数据库突然连不上，myeclipse运行项目时报错如下

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
2019-8-14 2:45:17 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet LoginServlet threw exception
java.lang.NullPointerException

百度出来N种方法都没用，点开Navicat连接数据库，弹窗
Can’t connect to MySQL server on localhost (10061)

按这个提示百度搜索出解决方法如下

方法1，
开始菜单 - 计算机管理 - 服务和应用程序 - 服务
在列表中找到MYSQL（或者MYSQL57）
点开，服务状态点启动

方法2，
cmd执行net start mysql命令启动mysql