WARN: Establishing SSL connection without server's identity verification is not recommended
0.要想用Java連接mysql數據庫，首先裝好JDK，配置好環境變量，將jdk*.*.*\lib放入classpath，將jdk*.*.*\bin放入path中（*.*.*表示版本號）；其次安裝好mysql數據庫，然後下載連接數據庫要用的驅動包，並配置環境變量（配置方法，將驅動包的路徑放入classpath中）。
1.Java使用mysql-jdbc連接MySQL出現如下警告：
Establishing SSL connection without server‘s identityverification 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 optionisn‘t set. For compliance with existing applications not using SSL theverifyServerCertificate property is set to ‘false‘. You need either toexplicitly disable SSL by setting useSSL=false, or set useSSL=true and providetruststore for server certificate verification.
原因是MySQL在高版本需要指明是否進行SSL連接。解決方案如下：
在mysql連接字符串url中加入ssl=true或者false即可，如下所示。
url=jdbc:mysql://127.0.0.1:3306/framework?characterEncoding=utf8&useSSL=true
2.對於錯誤：
要在url中加入serverTimezone=America/New_York，如下所示：
publicstatic final StringDBURL="jdbc:mysql://localhost:3306/d1?useSSL=true&useLegacyDatetimeCode=false&serverTimezone=America/New_York";
（解決網址：http://stackoverflow.com/questions/7605953/how-to-change-mysql-timezone-in-java-connection）
WARN: Establishing SSL connection without server's identity verification is not recommended