[logback] 變量指定默認值

格式是 ${變量名:-默認值}，**光有冒號還不夠，再加條短線後面纔是默認值**html <appender name="info" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>/logs${log.folder:-/imeth}/info.log</file> <rollingPo

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