try {
				// Allows post-processing of the bean factory in context subclasses.
				postProcessBeanFactory(beanFactory);

				// Invoke factory processors registered as beans in the context.
				invokeBeanFactoryPostProcessors(beanFactory);

				// Register bean processors that intercept bean creation.
				registerBeanPostProcessors(beanFactory);

				// Initialize message source for this context.
				initMessageSource();

				// Initialize event multicaster for this context.
				initApplicationEventMulticaster();

				// Initialize other special beans in specific context subclasses.
                // ------------------> ‼️就是这里
				onRefresh();

				// Check for listener beans and register them.
				registerListeners();

				// Instantiate all remaining (non-lazy-init) singletons.
				finishBeanFactoryInitialization(beanFactory);

				// Last step: publish corresponding event.
				finishRefresh();
			}

/**
 * Template method which can be overridden to add context-specific refresh work.
 * Called on initialization of special beans, before instantiation of singletons.
 * <p>This implementation is empty.
 * @throws BeansException in case of errors
 * @see #refresh()
 */
protected void onRefresh() throws BeansException {
	// For subclasses: do nothing by default.
}

protected void onRefresh() {
    super.onRefresh();

    try {
        // -------------> 主要就是这里，创建 webserver
        this.createWebServer();
    } catch (Throwable var2) {
        throw new ApplicationContextException("Unable to start web server", var2);
    }
}

private void createWebServer() {
    WebServer webServer = this.webServer;
    ServletContext servletContext = this.getServletContext();
    if (webServer == null && servletContext == null) {
        ServletWebServerFactory factory = this.getWebServerFactory();
        this.webServer = factory.getWebServer(new ServletContextInitializer[]{this.getSelfInitializer()});
    } else if (servletContext != null) {
        try {
            this.getSelfInitializer().onStartup(servletContext);
        } catch (ServletException var4) {
            throw new ApplicationContextException("Cannot initialize servlet context", var4);
        }
    }

    this.initPropertySources();
}

protected ServletWebServerFactory getWebServerFactory() {
    String[] beanNames = this.getBeanFactory().getBeanNamesForType(ServletWebServerFactory.class);
    if (beanNames.length == 0) {
        throw new ApplicationContextException("Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.");
    } else if (beanNames.length > 1) {
        throw new ApplicationContextException("Unable to start ServletWebServerApplicationContext due to multiple ServletWebServerFactory beans : " + StringUtils.arrayToCommaDelimitedString(beanNames));
    } else {
        return (ServletWebServerFactory)this.getBeanFactory().getBean(beanNames[0], ServletWebServerFactory.class);
    }
}

@Override
	public WebServer getWebServer(ServletContextInitializer... initializers) {
		if (this.disableMBeanRegistry) {
			Registry.disableRegistry();
		}
		Tomcat tomcat = new Tomcat();
		File baseDir = (this.baseDirectory != null) ? this.baseDirectory : createTempDir("tomcat");
		tomcat.setBaseDir(baseDir.getAbsolutePath());
		Connector connector = new Connector(this.protocol);
		connector.setThrowOnFailure(true);
		tomcat.getService().addConnector(connector);
		customizeConnector(connector);
		tomcat.setConnector(connector);
		tomcat.getHost().setAutoDeploy(false);
		configureEngine(tomcat.getEngine());
		for (Connector additionalConnector : this.additionalTomcatConnectors) {
			tomcat.getService().addConnector(additionalConnector);
		}
		prepareContext(tomcat.getHost(), initializers);
		return getTomcatWebServer(tomcat);
	}

/**
 * Factory method called to create the {@link TomcatWebServer}. Subclasses can
 * override this method to return a different {@link TomcatWebServer} or apply
 * additional processing to the Tomcat server.
 * @param tomcat the Tomcat server.
 * @return a new {@link TomcatWebServer} instance
 */
protected TomcatWebServer getTomcatWebServer(Tomcat tomcat) {
	return new TomcatWebServer(tomcat, getPort() >= 0);
}

public TomcatWebServer(Tomcat tomcat, boolean autoStart) {
	Assert.notNull(tomcat, "Tomcat Server must not be null");
	this.tomcat = tomcat;
	this.autoStart = autoStart;
	initialize();
}

private void initialize() throws WebServerException {
		logger.info("Tomcat initialized with port(s): " + getPortsDescription(false));
		synchronized (this.monitor) {
			try {
				addInstanceIdToEngineName();

				Context context = findContext();
				context.addLifecycleListener((event) -> {
					if (context.equals(event.getSource()) && Lifecycle.START_EVENT.equals(event.getType())) {
						// Remove service connectors so that protocol binding doesn't
						// happen when the service is started.
						removeServiceConnectors();
					}
				});

				// Start the server to trigger initialization listeners
				this.tomcat.start();

				// We can re-throw failure exception directly in the main thread
				rethrowDeferredStartupExceptions();

				try {
					ContextBindings.bindClassLoader(context, context.getNamingToken(), getClass().getClassLoader());
				}
				catch (NamingException ex) {
					// Naming is not enabled. Continue
				}

				// Unlike Jetty, all Tomcat threads are daemon threads. We create a
				// blocking non-daemon to stop immediate shutdown
				startDaemonAwaitThread();
			}
			catch (Exception ex) {
				stopSilently();
				destroySilently();
				throw new WebServerException("Unable to start embedded Tomcat", ex);
			}
		}
	}
```  
这里就是继续调用 `org.apache.catalina.startup.Tomcat#start`
```java
    public void start() throws LifecycleException {
        this.getServer();
        this.server.start();
    }
```      
获取server, `org.apache.catalina.startup.Tomcat#getServer`
```java
public Server getServer() {
        if (this.server != null) {
            return this.server;
        } else {
            System.setProperty("catalina.useNaming", "false");
            this.server = new StandardServer();
            this.initBaseDir();
            ConfigFileLoader.setSource(new CatalinaBaseConfigurationSource(new File(this.basedir), (String)null));
            this.server.setPort(-1);
            Service service = new StandardService();
            service.setName("Tomcat");
            this.server.addService(service);
            return this.server;
        }
    }

public void afterPropertiesSet() {
		this.config = new RequestMappingInfo.BuilderConfiguration();
		this.config.setUrlPathHelper(getUrlPathHelper());
		this.config.setPathMatcher(getPathMatcher());
		this.config.setSuffixPatternMatch(useSuffixPatternMatch());
		this.config.setTrailingSlashMatch(useTrailingSlashMatch());
		this.config.setRegisteredSuffixPatternMatch(useRegisteredSuffixPatternMatch());
		this.config.setContentNegotiationManager(getContentNegotiationManager());

		super.afterPropertiesSet();
	}

@Override
public void afterPropertiesSet() {
	initHandlerMethods();
}

protected void initHandlerMethods() {
		for (String beanName : getCandidateBeanNames()) {
			if (!beanName.startsWith(SCOPED_TARGET_NAME_PREFIX)) {
				processCandidateBean(beanName);
			}
		}
		handlerMethodsInitialized(getHandlerMethods());
	}

protected void processCandidateBean(String beanName) {
	Class<?> beanType = null;
	try {
		beanType = obtainApplicationContext().getType(beanName);
	}
	catch (Throwable ex) {
		// An unresolvable bean type, probably from a lazy bean - let's ignore it.
		if (logger.isTraceEnabled()) {
			logger.trace("Could not resolve type for bean '" + beanName + "'", ex);
		}
	}
	if (beanType != null && isHandler(beanType)) {
		detectHandlerMethods(beanName);
	}
}

@Override
protected boolean isHandler(Class<?> beanType) {
	return (AnnotatedElementUtils.hasAnnotation(beanType, Controller.class) ||
			AnnotatedElementUtils.hasAnnotation(beanType, RequestMapping.class));
}

protected void detectHandlerMethods(Object handler) {
		Class<?> handlerType = (handler instanceof String ?
				obtainApplicationContext().getType((String) handler) : handler.getClass());

		if (handlerType != null) {
			Class<?> userType = ClassUtils.getUserClass(handlerType);
			Map<Method, T> methods = MethodIntrospector.selectMethods(userType,
					(MethodIntrospector.MetadataLookup<T>) method -> {
						try {
							return getMappingForMethod(method, userType);
						}
						catch (Throwable ex) {
							throw new IllegalStateException("Invalid mapping on handler class [" +
									userType.getName() + "]: " + method, ex);
						}
					});
			if (logger.isTraceEnabled()) {
				logger.trace(formatMappings(userType, methods));
			}
			methods.forEach((method, mapping) -> {
				Method invocableMethod = AopUtils.selectInvocableMethod(method, userType);
				registerHandlerMethod(handler, invocableMethod, mapping);
			});
		}
	}

@Override
@Nullable
protected RequestMappingInfo getMappingForMethod(Method method, Class<?> handlerType) {
	RequestMappingInfo info = createRequestMappingInfo(method);
	if (info != null) {
		RequestMappingInfo typeInfo = createRequestMappingInfo(handlerType);
		if (typeInfo != null) {
			info = typeInfo.combine(info);
		}
		String prefix = getPathPrefix(handlerType);
		if (prefix != null) {
			info = RequestMappingInfo.paths(prefix).options(this.config).build().combine(info);
		}
	}
	return info;
}

@Nullable
private RequestMappingInfo createRequestMappingInfo(AnnotatedElement element) {
	RequestMapping requestMapping = AnnotatedElementUtils.findMergedAnnotation(element, RequestMapping.class);
	RequestCondition<?> condition = (element instanceof Class ?
			getCustomTypeCondition((Class<?>) element) : getCustomMethodCondition((Method) element));
	return (requestMapping != null ? createRequestMappingInfo(requestMapping, condition) : null);
}

protected void registerHandlerMethod(Object handler, Method method, T mapping) {
	this.mappingRegistry.register(mapping, handler, method);
}

public void register(T mapping, Object handler, Method method) {
			// Assert that the handler method is not a suspending one.
			if (KotlinDetector.isKotlinType(method.getDeclaringClass())) {
				Class<?>[] parameterTypes = method.getParameterTypes();
				if ((parameterTypes.length > 0) && "kotlin.coroutines.Continuation".equals(parameterTypes[parameterTypes.length - 1].getName())) {
					throw new IllegalStateException("Unsupported suspending handler method detected: " + method);
				}
			}
			this.readWriteLock.writeLock().lock();
			try {
				HandlerMethod handlerMethod = createHandlerMethod(handler, method);
				validateMethodMapping(handlerMethod, mapping);
				this.mappingLookup.put(mapping, handlerMethod);

				List<String> directUrls = getDirectUrls(mapping);
				for (String url : directUrls) {
					this.urlLookup.add(url, mapping);
				}

				String name = null;
				if (getNamingStrategy() != null) {
					name = getNamingStrategy().getName(handlerMethod, mapping);
					addMappingName(name, handlerMethod);
				}

				CorsConfiguration corsConfig = initCorsConfiguration(handler, method, mapping);
				if (corsConfig != null) {
					this.corsLookup.put(handlerMethod, corsConfig);
				}

				this.registry.put(mapping, new MappingRegistration<>(mapping, handlerMethod, directUrls, name));
			}
			finally {
				this.readWriteLock.writeLock().unlock();
			}
		}

RequestMappingHandlerMapping mapping = appContext.getBean(RequestMappingHandlerMapping.class);
Map<RequestMappingInfo, HandlerMethod> map = mapping.getHandlerMethods();
for (Map.Entry<RequestMappingInfo, HandlerMethod> entry : map.entrySet()) {
    Set<String> urlSet = entry.getKey().getPatternsCondition().getPatterns();
    for (String url : urlSet) {
        System.out.println(url);
    }
}

public Map<T, HandlerMethod> getHandlerMethods() {
		this.mappingRegistry.acquireReadLock();
		try {
			return Collections.unmodifiableMap(this.mappingRegistry.getMappings());
		}
		finally {
			this.mappingRegistry.releaseReadLock();
		}
	}

public Map<T, HandlerMethod> getMappings() {
	return this.mappingLookup;
}

class MappingRegistry {

	private final Map<T, MappingRegistration<T>> registry = new HashMap<>();

	private final Map<T, HandlerMethod> mappingLookup = new LinkedHashMap<>();

public void register(T mapping, Object handler, Method method) {
			// Assert that the handler method is not a suspending one.
			if (KotlinDetector.isKotlinType(method.getDeclaringClass())) {
				Class<?>[] parameterTypes = method.getParameterTypes();
				if ((parameterTypes.length > 0) && "kotlin.coroutines.Continuation".equals(parameterTypes[parameterTypes.length - 1].getName())) {
					throw new IllegalStateException("Unsupported suspending handler method detected: " + method);
				}
			}
			this.readWriteLock.writeLock().lock();
			try {
				HandlerMethod handlerMethod = createHandlerMethod(handler, method);
				validateMethodMapping(handlerMethod, mapping);
				this.mappingLookup.put(mapping, handlerMethod); 

public class PatternsRequestCondition extends AbstractRequestCondition<PatternsRequestCondition> {

	private final static Set<String> EMPTY_PATH_PATTERN = Collections.singleton("");


	private final Set<String> patterns;

SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(kmf.getKeyManagers(), null, new SecureRandom());
return new SSLConnectionSocketFactory(sslContext, new String[]{"TLSv1"}, null, new DefaultHostnameVerifier());