logback.groovy配置文件中选择环境的问题请教

Question

logback.groovy配置文件中有四行代码不明白，麻烦谁会解释下：
def props = new Properties()
props.load(this.getClass().getClassLoader().getResourceAsStream("properties/application.properties"))

def config = new ConfigSlurper().parse(props)

def env = System.properties['spring.profiles.active'] ?: 'production'

Answer 1

https://blog.csdn.net/swordmanChen/article/details/80566564