Could not resolve placeholder 'spring.datasource.druid.initialSize' in value "${spring.datasource.druid.initialSize}"
配置文件中的参数无法读取
原因是当springboot有多个配置文件时，需要指定使用的配置文件
yml文件命名规则为application-{profiles}.yml，然后，在原来application.yml 做**配置，**哪个，哪个生效。
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