java.util.logging.Logger#demandLogger// JUL 日志管理器LogManager manager = LogManager.getLogManager();// java.util.logging.LogManager#ensureLogManagerInitializedowner.rootLogger = owner.new RootLogger();owner.addLogger(owner.rootLogger);if (!owner.rootLogger.isLevelInitialized()) { ?// private final static Level defaultLevel = Level.INFO; ?owner.rootLogger.setLevel(defaultLevel);}/** * 將自定義的父子關(guān)系通過路徑來進(jìn)行關(guān)聯(lián) * owner.addLogger(owner.rootLogger);