轉載：jdbc連接mysql 8 的一些坑
1、驅動包要升級為 mysql-connector-java-8.0.11.jar
2、JDBC driver 由“com.mysql.jdbc.Driver”改為“com.mysql.cj.jdbc.Driver”
3、url中加上“userSSL=false”。否則會出現以下錯誤：
“Establishing SSL connection withoutserver'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 defaultif explicit option isn't set. For compliance with existing applications notusing SSL the verifyServerCertificate property is set to 'false'. You needeither to explicitly disable SSL by setting useSSL=false, or set useSSL=trueand provide truststore for server certificate verification.”
4、url中加上“serverTimezone=GMT%2B8”（GMT%2B8代表東八區）
或者直接修改數據庫的默認時區:
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show variables like '%time_zone%';
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set global time_zone='+8:00';
最后附示例URL：
jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&userSSL=false&serverTimezone=GMT%2B8