mysql8.0之后版本-连接常见错误

1.Connections could not be acquired from the underlying database

    原因：从描述来看不是密码错误，也不是路径错误，因为下载的MySQL workbench设置了自动更新，mysql-connector-java版本更新了

               所以maven重新导入mysql-connector-java版本

2.The server time zone value 'Öйú±ê׼ʱ¼ä' 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.

  原因：从描述来看是是时区的问题

  解决方法：1. 在jdbcUrl后面添加时区属性： "?serverTimezone=GMT%2B8"

                    2.  设置mysql全局属性

show databases;
show variables like '%time_zone%';
set global time_zone='+8:00';