在IDEA中使用JDBC獲取數據庫連接時,有時會報錯Sat Dec 19 19:32:18 CST 2020 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.
解決辦法：
在DriverManager.getConnection()方法的第一次參數的"數據庫名稱"后加上下方黑體標注內容“？useSSL=false”.
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/userlogin?useSSL=false","****","******");