java jdbc 连接mysql8.0时的若干问题

1.问题一 出现如下所示错误：
Sun May 05 20:50:34 CST 2019 WARN: Establishing SSL connection without server’s identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn’t set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to ‘false’. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
修改方法：
Connection conn = DriverManager.getConnection(“jdbc:mysql://localhost:3306/test?useSSL=false”,“root”,“755991”);

2.password 验证方式
https://blog.csdn.net/h996666/article/details/81779299
3. Class.forName(“com.mysql.jdbc.Driver”)
出错 新版本这个已被弃用
Class.forName(“com.mysql.cj.jdbc.Driver”)；

4.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.

Connection conn = DriverManager.getConnection(“jdbc:mysql://localhost:3306/test?useUnicode = true&serverTimezone = GMT&useSSL = false”,“root”,“755991”);

附：Navicat Premium
https://www.jianshu.com/p/5f693b4c9468