SpringBoot 用的 spring-jcl 打印日志，与 LoggingSystem 有鸡毛关系？

public static Logger getLogger(String name) {
    ILoggerFactory iLoggerFactory = getILoggerFactory();
    return iLoggerFactory.getLogger(name);
}

/**
 * The unique instance of this class.
 */
private static StaticLoggerBinder SINGLETON = new StaticLoggerBinder();

static {
    SINGLETON.init();
}

private StaticLoggerBinder() {
    defaultLoggerContext.setName(CoreConstants.DEFAULT_CONTEXT_NAME);
}

private LoggerContext defaultLoggerContext = new LoggerContext();

public static StaticLoggerBinder getSingleton() {
    return SINGLETON;
}

public class LoggerContext extends ContextBase implements ILoggerFactory, LifeCycle {

    final Logger root;
    private int size;

    private Map<String, Logger> loggerCache;

    public LoggerContext() {
        super();
        this.loggerCache = new ConcurrentHashMap<String, Logger>();

        this.loggerContextRemoteView = new LoggerContextVO(this);
        this.root = new Logger(Logger.ROOT_LOGGER_NAME, null, this);
        this.root.setLevel(Level.DEBUG);
        loggerCache.put(Logger.ROOT_LOGGER_NAME, root);
        initEvaluatorMap();
        size = 1;
        this.frameworkPackages = new ArrayList<String>();
    }

    public final Logger getLogger(final Class<?> clazz) {
        return getLogger(clazz.getName());
    }

    @Override
    public final Logger getLogger(final String name) {

        if (name == null) {
            throw new IllegalArgumentException("name argument cannot be null");
        }

        // if we are asking for the root logger, then let us return it without
        // wasting time
        if (Logger.ROOT_LOGGER_NAME.equalsIgnoreCase(name)) {
            return root;
        }

        int i = 0;
        Logger logger = root;

        // check if the desired logger exists, if it does, return it
        // without further ado.
        Logger childLogger = (Logger) loggerCache.get(name);
        // if we have the child, then let us return it without wasting time
        if (childLogger != null) {
            return childLogger;
        }

        // if the desired logger does not exist, them create all the loggers
        // in between as well (if they don't already exist)
        String childName;
        while (true) {
            int h = LoggerNameUtil.getSeparatorIndexOf(name, i);
            if (h == -1) {
                childName = name;
            } else {
                childName = name.substring(0, h);
            }
            // move i left of the last point
            i = h + 1;
            synchronized (logger) {
                childLogger = logger.getChildByName(childName);
                if (childLogger == null) {
                    childLogger = logger.createChildByName(childName);
                    loggerCache.put(childName, childLogger);
                    incSize();
                }
            }
            logger = childLogger;
            if (h == -1) {
                return childLogger;
            }
        }
    }

    private void incSize() {
        size++;
    }

    int size() {
        return size;
    }
}

private static final Logger LOGGER = LoggerFactory.getLogger(TestWeb.class);

@GetMapping("hello")
public String hello(@RequestParam("name") String name) {
    LOGGER.info("hello接口入参：{}", name);
    return "hello, " + name;
}

private void buildLoggingEventAndAppend(final String localFQCN, final Marker marker, final Level level, final String msg, 
                final Object[] params, final Throwable t) {
    LoggingEvent le = new LoggingEvent(localFQCN, this, level, msg, t, params);
    le.setMarker(marker);
    callAppenders(le);
}

private static StaticLoggerBinder SINGLETON = new StaticLoggerBinder();

static {
    SINGLETON.init();
}

/**
 * Package access for testing purposes.
 */
void init() {
    try {
        try {
            new ContextInitializer(defaultLoggerContext).autoConfig();
        } catch (JoranException je) {
            Util.report("Failed to auto configure default logger context", je);
        }
        // logback-292
        if (!StatusUtil.contextHasStatusListener(defaultLoggerContext)) {
            StatusPrinter.printInCaseOfErrorsOrWarnings(defaultLoggerContext);
        }
        contextSelectorBinder.init(defaultLoggerContext, KEY);
        initialized = true;
    } catch (Exception t) { // see LOGBACK-1159
        Util.report("Failed to instantiate [" + LoggerContext.class.getName() + "]", t);
    }
}

@Override
protected void reinitialize(LoggingInitializationContext initializationContext) {
    getLoggerContext().reset();
    getLoggerContext().getStatusManager().clear();
    loadConfiguration(initializationContext, getSelfInitializationConfig(), null);
}

@Override
public void reset() {
    resetCount++;
    super.reset();
    initEvaluatorMap();
    initCollisionMaps();
    root.recursiveReset();
    resetTurboFilterList();
    cancelScheduledTasks();
    fireOnReset();
    resetListenersExceptResetResistant();
    resetStatusListeners();
}

public void reset() {

    removeShutdownHook();
    getLifeCycleManager().reset();
    propertyMap.clear();
    objectMap.clear();
}