mysql8.0鏈接jdbc驅動配置以及db.properties文件配置

一.mysql8.0+與jdbc鏈接異常： Sun Mar 10 09:29:16 CST 2019 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+ requirem

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