jdbc连接数据库出错The driver has not received any packets from the server.

[般若波羅蜜多]

我用Java连接数据库总是连接不成功，抛出的异常大概是The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.貌似是没有连接到服务器，下面有截图。
我添加的jar包步骤应该是对的，我的MySQL服务也应该是开着的，可以在navicat上编辑。
百度搜索一天也没弄好，请各位神仙指点迷津，我是新手，可用分不多，全部奉上，万分感谢~

[般若波羅蜜多]

并且我的数据库abc在navicat上创建过了，用户名密码都正确

[等一次另眼相看]

这个异常是说驱动程序没有收到来自服务器的任何数据。其它没问题的话，你可以执行一些简单的sql语句试试会不会报错，参考这里 https://blog.csdn.net/qq_44238142/article/details/88605985

[咦哟~~~]

引用 1 楼 般若波羅蜜多 的回复:

并且我的数据库abc在navicat上创建过了，用户名密码都正确

https://blog.csdn.net/shiqidide/article/details/7642531 建议看看这个

[931828653]

try { Class.forName("com.mysql.jdbc.Driver"); System.out.println ("数据库驱动加载成功！"); con = DriverManager.getConnection("jdbc:mysql://localhost:3306/StudentSystem","ms","123456"); System.out.println ("数据库连接成功！"); } catch (ClassNotFoundException e1) { System.out.println ("数据库驱动加载失败！"); }catch(SQLException e2){ System.out.println ("数据库连接失败！"); } return con; } 抛异常 看看 然后 在main方法 调用下

[般若波羅蜜多]

经过一番曲折，终于在你们的帮助下解决了，谢谢各位~~
首先我重装了mysql，又抛出两个异常，一个是加载驱动抛出的提示：Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'.我将Class.forName("com.mysql.jdbc.Driver")修改成了Class.forName("com.mysql.cj.jdbc.Driver");，
另一个是：The server time zone value '???ú±ê×??±??' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.我将url改成了String url ="jdbc:mysql://localhost:3306/abc?useUnicode = true&characterEncoding = utf-8&useSSL = false&serverTimezone = GMT";

[清韵凌波]

@shine2282 正解！

[shine2282]

其实就是SSL的问题，加上useSSL=false就好了