9.0版本无法连接本地mysql数据库，lib文件夹已替换mysql jar包，为mysql-connector-java-5.1.39-bin.jar，定义数据连接url为

jdbc:mysql://localhost:3306/hxyh?useUnicode=true&characterEncoding=UTF-8

设计器日志报错

2021-07-13 15:45:17

严重:15:45:17 Druid-ConnectionPool-Create-1843416519jdbc:mysql://localhost:3306/hxyh?useUnicode=true&characterEncoding=UTF-8 ERROR [com.fr.third.alibaba.druid.pool.DruidDataSource] create connection error, url: jdbc:mysql://localhost:3306/hxyh?useUnicode=true&characterEncoding=UTF-8, errorCode 0, state 08001

2021-07-13 15:45:27

警告:15:45:27 pool-17-thread-1 WARN [root] 错误代码:31300012 创建数据连接失败: Could not create connection to database server.

2021-07-13 15:45:27

严重:15:45:27 SwingWorker-pool-16-thread-5 ERROR [root] com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.

求大佬解惑