問題1：
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.
1.在數據庫連接的url中添加useSSL=false;
2.url中添加useSSL=true，並且提供服務器的驗證證書。
如果只是做一個測試的話，沒必要搞證書那么麻煩啦，在連接后添加一個useSSL=false即可，例如：
jdbc:mysql://localhost:3306/test?useSSL=false
問題2：
Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransien
我干脆換了一個最新的mysql jar包，重啟解決了