For compliance with existing applications not using SSL the verifyServerCertificate property

警告：

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.

 

翻译：

不建议在没有服务器身份验证的情况下建立SSL连接。 根据MySQL 5.5.45 +，5.6.26 +和5.7.6+的要求，如果未设置显式选项，则默认情况下必须建立SSL连接。 为了与不使用SSL的现有应用程序兼容，将verifyServerCertificate属性设置为'false'。 您需要通过设置useSSL = false来显式禁用SSL，或者设置useSSL = true并为服务器证书验证提供信任库。

 

解决：在mysql连接字符串url中加入ssl=true或者false即可，如下所示

private static final String url = "jdbc:mysql://localhost:3306/Book?characterEncoding=utf-8&useSSL=true";

在IntelliJ IDEA中   “&”   被当成了特殊符号。

Unescaped & or nonterminated character/entity reference

 

解决：将“&”改写为“&”

private static final String url = "jdbc:mysql://localhost:3306/Book?characterEncoding=utf-8&useSSL=true";

 

参考链接：https://blog.csdn.net/q343509740/article/details/79527201