MySql :Could not create connection to database server.

错误：

Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
### The error may exist in cn/action/dao/UserDao.xml
### The error may involve cn.action.dao.UserDao.findList
### The error occurred while executing a query
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:136)
    at cn.action.test01.TestSelectList.main(TestSelectList.java:29)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

 

原因：

MySql8.0应用低版本jar包，产生错误

解决：

1.下载高版本jar包

可以在官网下载跨平台版本，或在下面连接中下载，

百度网盘：https://pan.baidu.com/s/1xlUg9b6mxzt9fWt0u_7qag

下载后解压：

2.更改驱动名

以前：com.mysql.jdbc.Driver

更改后：com.mysql.cj.jdbc.Driver

3.删除原来的驱动包

项目上右键->Build Path->Configure Build Path->Libraries中带错误的jar包remove

4.由于版本时区不同，要在数据库后加上“?serverTimezone=UTC"