连接mysql时报错：The driver has not received any packets from the server.
连接mysql时报错。
前几天可以打开的数据库也不能打开，报java.net.ConnectException: Connection refused: connect.错误。
报错原因：mysql服务没连接上。
解决方法：
点击 开始->运行，输入services.msc进入服务，手动打开MySQL服务，再次连接即可成功。
由于没有手动关闭mysql连接，导致一开始没有想到这个问题，一直在搜jdbc自动配置导致花了不少时间。
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