logback日志级别设置无效问题及解决

    {
      "name": "logging.level",
      "type": "java.util.Map<java.lang.String,java.lang.String>",
      "description": "Log levels severity mapping. For instance, `logging.level.org.springframework=DEBUG`.",
      "sourceType": "org.springframework.boot.context.logging.LoggingApplicationListener"
    }

	protected void setLogLevels(LoggingSystem system, ConfigurableEnvironment environment) {
		BiConsumer<String, LogLevel> customizer = getLogLevelConfigurer(system);
		Binder binder = Binder.get(environment);
		# 从配置中获取日志级别的配置项
		Map<String, LogLevel> levels = binder.bind(LOGGING_LEVEL, STRING_LOGLEVEL_MAP).orElseGet(Collections::emptyMap);
		levels.forEach((name, level) -> configureLogLevel(name, level, customizer));
	}

	private void configureLogLevel(String name, LogLevel level, BiConsumer<String, LogLevel> configurer) {
		if (this.loggerGroups != null) {
			LoggerGroup group = this.loggerGroups.get(name);
			if (group != null && group.hasMembers()) {
				group.configureLogLevel(level, configurer);
				return;
			}
		}
		# 代码会走到这里
		configurer.accept(name, level);
	}