java.sql.SQLException: The server time zone value '???ú±ê×??±??' is unrecognized or represents数据库时区

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本文记录了一次解决MySQL连接时出现的警告及错误的过程，包括未验证服务器身份的SSL连接警告，以及服务器时区配置导致的异常。通过修改数据库连接URL中的时区参数，成功解决了这些问题。

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Thu May 03 19:08:46 CST 2018 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.
19:08:46,139 ERROR DruidDataSource:2469 - create connection SQLException, url: jdbc:mysql:///18-05-02-ylf-parent, errorCode 0, state 01S00
java.sql.SQLException: 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.
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:127)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:95)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:87)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:61)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:71)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:862)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:444)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:230)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:226)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1513)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1578)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2466)

db.properties文件内容改之前

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql:///18-05-02-ylf-parent
jdbc.username=root
jdbc.password=1234

改之后

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql:///18-05-02-ylf-parent?serverTimezone=GMT
jdbc.username=root
jdbc.password=1234

就是url后面的那个添加时区，貌似是数据库的jar太新了，我用的是maven工程

参考 https://blog.youkuaiyun.com/oppo5630/article/details/52162783