public interface HandlerMapping {
	String BEST_MATCHING_HANDLER_ATTRIBUTE = HandlerMapping.class.getName() + ".bestMatchingHandler";
	@Deprecated
	String LOOKUP_PATH = HandlerMapping.class.getName() + ".lookupPath";
	String PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE = HandlerMapping.class.getName() + ".pathWithinHandlerMapping";
	String BEST_MATCHING_PATTERN_ATTRIBUTE = HandlerMapping.class.getName() + ".bestMatchingPattern";
	String INTROSPECT_TYPE_LEVEL_MAPPING = HandlerMapping.class.getName() + ".introspectTypeLevelMapping";
	String URI_TEMPLATE_VARIABLES_ATTRIBUTE = HandlerMapping.class.getName() + ".uriTemplateVariables";
	String MATRIX_VARIABLES_ATTRIBUTE = HandlerMapping.class.getName() + ".matrixVariables";
	String PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE = HandlerMapping.class.getName() + ".producibleMediaTypes";
	default boolean usesPathPatterns() {
		return false;
	}
	@Nullable
	HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception;
}

@Override
protected void initApplicationContext() throws BeansException {
	extendInterceptors(this.interceptors);
	detectMappedInterceptors(this.adaptedInterceptors);
	initInterceptors();
}

protected void extendInterceptors(List<Object> interceptors) {
}

protected void detectMappedInterceptors(List<HandlerInterceptor> mappedInterceptors) {
	mappedInterceptors.addAll(BeanFactoryUtils.beansOfTypeIncludingAncestors(
			obtainApplicationContext(), MappedInterceptor.class, true, false).values());
}

protected void initInterceptors() {
	if (!this.interceptors.isEmpty()) {
		for (int i = 0; i < this.interceptors.size(); i++) {
			Object interceptor = this.interceptors.get(i);
			if (interceptor == null) {
				throw new IllegalArgumentException("Entry number " + i + " in interceptors array is null");
			}
			this.adaptedInterceptors.add(adaptInterceptor(interceptor));
		}
	}
}

@Override
@Nullable
public final HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception {
	Object handler = getHandlerInternal(request);
	if (handler == null) {
		handler = getDefaultHandler();
	}
	if (handler == null) {
		return null;
	}
	// Bean name or resolved handler?
	if (handler instanceof String) {
		String handlerName = (String) handler;
		handler = obtainApplicationContext().getBean(handlerName);
	}
	// Ensure presence of cached lookupPath for interceptors and others
	if (!ServletRequestPathUtils.hasCachedPath(request)) {
		initLookupPath(request);
	}
	HandlerExecutionChain executionChain = getHandlerExecutionChain(handler, request);
	if (hasCorsConfigurationSource(handler) || CorsUtils.isPreFlightRequest(request)) {
		CorsConfiguration config = getCorsConfiguration(handler, request);
		if (getCorsConfigurationSource() != null) {
			CorsConfiguration globalConfig = getCorsConfigurationSource().getCorsConfiguration(request);
			config = (globalConfig != null ? globalConfig.combine(config) : config);
		}
		if (config != null) {
			config.validateAllowCredentials();
		}
		executionChain = getCorsHandlerExecutionChain(request, executionChain, config);
	}
	return executionChain;
}

protected HandlerExecutionChain getHandlerExecutionChain(Object handler, HttpServletRequest request) {
	HandlerExecutionChain chain = (handler instanceof HandlerExecutionChain ?
			(HandlerExecutionChain) handler : new HandlerExecutionChain(handler));
	for (HandlerInterceptor interceptor : this.adaptedInterceptors) {
		if (interceptor instanceof MappedInterceptor) {
			MappedInterceptor mappedInterceptor = (MappedInterceptor) interceptor;
			if (mappedInterceptor.matches(request)) {
				chain.addInterceptor(mappedInterceptor.getInterceptor());
			}
		}
		else {
			chain.addInterceptor(interceptor);
		}
	}
	return chain;
}

@Override
@Nullable
protected Object getHandlerInternal(HttpServletRequest request) throws Exception {
	String lookupPath = initLookupPath(request);
	Object handler;
	if (usesPathPatterns()) {
		RequestPath path = ServletRequestPathUtils.getParsedRequestPath(request);
		handler = lookupHandler(path, lookupPath, request);
	}
	else {
		handler = lookupHandler(lookupPath, request);
	}
	if (handler == null) {
		// We need to care for the default handler directly, since we need to
		// expose the PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE for it as well.
		Object rawHandler = null;
		if (StringUtils.matchesCharacter(lookupPath, '/')) {
			rawHandler = getRootHandler();
		}
		if (rawHandler == null) {
			rawHandler = getDefaultHandler();
		}
		if (rawHandler != null) {
			// Bean name or resolved handler?
			if (rawHandler instanceof String) {
				String handlerName = (String) rawHandler;
				rawHandler = obtainApplicationContext().getBean(handlerName);
			}
			validateHandler(rawHandler, request);
			handler = buildPathExposingHandler(rawHandler, lookupPath, lookupPath, null);
		}
	}
	return handler;
}

@Nullable
protected Object lookupHandler(String lookupPath, HttpServletRequest request) throws Exception {
	Object handler = getDirectMatch(lookupPath, request);
	if (handler != null) {
		return handler;
	}
	// Pattern match?
	List<String> matchingPatterns = new ArrayList<>();
	for (String registeredPattern : this.handlerMap.keySet()) {
		if (getPathMatcher().match(registeredPattern, lookupPath)) {
			matchingPatterns.add(registeredPattern);
		}
		else if (useTrailingSlashMatch()) {
			if (!registeredPattern.endsWith("/") && getPathMatcher().match(registeredPattern + "/", lookupPath)) {
				matchingPatterns.add(registeredPattern + "/");
			}
		}
	}
	String bestMatch = null;
	Comparator<String> patternComparator = getPathMatcher().getPatternComparator(lookupPath);
	if (!matchingPatterns.isEmpty()) {
		matchingPatterns.sort(patternComparator);
		bestMatch = matchingPatterns.get(0);
	}
	if (bestMatch != null) {
		handler = this.handlerMap.get(bestMatch);
		if (handler == null) {
			if (bestMatch.endsWith("/")) {
				handler = this.handlerMap.get(bestMatch.substring(0, bestMatch.length() - 1));
			}
			if (handler == null) {
				throw new IllegalStateException(
						"Could not find handler for best pattern match [" + bestMatch + "]");
			}
		}
		// Bean name or resolved handler?
		if (handler instanceof String) {
			String handlerName = (String) handler;
			handler = obtainApplicationContext().getBean(handlerName);
		}
		validateHandler(handler, request);
		String pathWithinMapping = getPathMatcher().extractPathWithinPattern(bestMatch, lookupPath);
		// There might be multiple 'best patterns', let's make sure we have the correct URI template variables
		// for all of them
		Map<String, String> uriTemplateVariables = new LinkedHashMap<>();
		for (String matchingPattern : matchingPatterns) {
			if (patternComparator.compare(bestMatch, matchingPattern) == 0) {
				Map<String, String> vars = getPathMatcher().extractUriTemplateVariables(matchingPattern, lookupPath);
				Map<String, String> decodedVars = getUrlPathHelper().decodePathVariables(request, vars);
				uriTemplateVariables.putAll(decodedVars);
			}
		}
		return buildPathExposingHandler(handler, bestMatch, pathWithinMapping, uriTemplateVariables);
	}
	// No handler found...
	return null;
}
@Nullable
private Object getDirectMatch(String urlPath, HttpServletRequest request) throws Exception {
	Object handler = this.handlerMap.get(urlPath);
	if (handler != null) {
		// Bean name or resolved handler?
		if (handler instanceof String) {
			String handlerName = (String) handler;
			handler = obtainApplicationContext().getBean(handlerName);
		}
		validateHandler(handler, request);
		return buildPathExposingHandler(handler, urlPath, urlPath, null);
	}
	return null;
}

protected Object buildPathExposingHandler(Object rawHandler, String bestMatchingPattern,
		String pathWithinMapping, @Nullable Map<String, String> uriTemplateVariables) {
	HandlerExecutionChain chain = new HandlerExecutionChain(rawHandler);
	chain.addInterceptor(new PathExposingHandlerInterceptor(bestMatchingPattern, pathWithinMapping));
	if (!CollectionUtils.isEmpty(uriTemplateVariables)) {
		chain.addInterceptor(new UriTemplateVariablesHandlerInterceptor(uriTemplateVariables));
	}
	return chain;
}

protected void registerHandler(String[] urlPaths, String beanName) throws BeansException, IllegalStateException {
	for (String urlPath : urlPaths) {
		registerHandler(urlPath, beanName);
	}
}
protected void registerHandler(String urlPath, Object handler) throws BeansException, IllegalStateException {
	Object resolvedHandler = handler;
	if (!this.lazyInitHandlers && handler instanceof String) {
		String handlerName = (String) handler;
		ApplicationContext applicationContext = obtainApplicationContext();
		if (applicationContext.isSingleton(handlerName)) {
			resolvedHandler = applicationContext.getBean(handlerName);
		}
	}
	Object mappedHandler = this.handlerMap.get(urlPath);
	if (mappedHandler != null) {
		if (mappedHandler != resolvedHandler) {
			throw new IllegalStateException(
					"Cannot map " + getHandlerDescription(handler) + " to URL path [" + urlPath +
					"]: There is already " + getHandlerDescription(mappedHandler) + " mapped.");
		}
	}
	else {
		if (urlPath.equals("/")) {
			setRootHandler(resolvedHandler);
		}
		else if (urlPath.equals("/*")) {
			setDefaultHandler(resolvedHandler);
		}
		else {
			this.handlerMap.put(urlPath, resolvedHandler);
			if (getPatternParser() != null) {
				this.pathPatternHandlerMap.put(getPatternParser().parse(urlPath), resolvedHandler);
			}
		}
	}
}

@Override
public void initApplicationContext() throws BeansException {
	super.initApplicationContext();
	registerHandlers(this.urlMap);
}
protected void registerHandlers(Map<String, Object> urlMap) throws BeansException {
	if (urlMap.isEmpty()) {
		logger.trace("No patterns in " + formatMappingName());
	}
	else {
		urlMap.forEach((url, handler) -> {
			// Prepend with slash if not already present.
			if (!url.startsWith("/")) {
				url = "/" + url;
			}
			// Remove whitespace from handler bean name.
			if (handler instanceof String) {
				handler = ((String) handler).trim();
			}
			registerHandler(url, handler);
		});
	}
}

<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="urlMap">
        <map>
            <entry key="/aaa" value-ref="/hello"/>
        </map>
    </property>
</bean>

@Override
public void initApplicationContext() throws ApplicationContextException {
	super.initApplicationContext();
	detectHandlers();
}
protected void detectHandlers() throws BeansException {
	ApplicationContext applicationContext = obtainApplicationContext();
	String[] beanNames = (this.detectHandlersInAncestorContexts ?
			BeanFactoryUtils.beanNamesForTypeIncludingAncestors(applicationContext, Object.class) :
			applicationContext.getBeanNamesForType(Object.class));
	for (String beanName : beanNames) {
		String[] urls = determineUrlsForHandler(beanName);
		if (!ObjectUtils.isEmpty(urls)) {
			registerHandler(urls, beanName);
		}
	}
}

public class BeanNameUrlHandlerMapping extends AbstractDetectingUrlHandlerMapping {
	@Override
	protected String[] determineUrlsForHandler(String beanName) {
		List<String> urls = new ArrayList<>();
		if (beanName.startsWith("/")) {
			urls.add(beanName);
		}
		String[] aliases = obtainApplicationContext().getAliases(beanName);
		for (String alias : aliases) {
			if (alias.startsWith("/")) {
				urls.add(alias);
			}
		}
		return StringUtils.toStringArray(urls);
	}
}

<bean class="org.javaboy.init.HelloController" name="/hello"/>
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" id="handlerMapping">
</bean>

@Override
public void afterPropertiesSet() {
	initHandlerMethods();
}
protected void initHandlerMethods() {
	for (String beanName : getCandidateBeanNames()) {
		if (!beanName.startsWith(SCOPED_TARGET_NAME_PREFIX)) {
			processCandidateBean(beanName);
		}
	}
	handlerMethodsInitialized(getHandlerMethods());
}
protected String[] getCandidateBeanNames() {
	return (this.detectHandlerMethodsInAncestorContexts ?
			BeanFactoryUtils.beanNamesForTypeIncludingAncestors(obtainApplicationContext(), Object.class) :
			obtainApplicationContext().getBeanNamesForType(Object.class));
}
protected void processCandidateBean(String beanName) {
	Class<?> beanType = null;
	try {
		beanType = obtainApplicationContext().getType(beanName);
	}
	catch (Throwable ex) {
	}
	if (beanType != null && isHandler(beanType)) {
		detectHandlerMethods(beanName);
	}
}

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);
					}
				});
		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;
}

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {
        configurer.setPatternParser(new PathPatternParser()).addPathPrefix("/itboyhub", HandlerTypePredicate.forAnnotation(RestController.class));
    }
}

protected void registerHandlerMethod(Object handler, Method method, T mapping) {
	this.mappingRegistry.register(mapping, handler, method);
}
public void register(T mapping, Object handler, Method method) {
	this.readWriteLock.writeLock().lock();
	try {
		HandlerMethod handlerMethod = createHandlerMethod(handler, method);
		validateMethodMapping(handlerMethod, mapping);
		Set<String> directPaths = AbstractHandlerMethodMapping.this.getDirectPaths(mapping);
		for (String path : directPaths) {
			this.pathLookup.add(path, mapping);
		}
		String name = null;
		if (getNamingStrategy() != null) {
			name = getNamingStrategy().getName(handlerMethod, mapping);
			addMappingName(name, handlerMethod);
		}
		CorsConfiguration corsConfig = initCorsConfiguration(handler, method, mapping);
		if (corsConfig != null) {
			corsConfig.validateAllowCredentials();
			this.corsLookup.put(handlerMethod, corsConfig);
		}
		this.registry.put(mapping,
				new MappingRegistration<>(mapping, handlerMethod, directPaths, name, corsConfig != null));
	}
	finally {
		this.readWriteLock.writeLock().unlock();
	}
}

@RestController
@RequestMapping("/javaboy")
public class HelloController {
    @GetMapping("/aaa")
    public String hello99() {
        return "aaa";
    }
}

<%@ taglib prefix="s" uri="http://www.springframework.org/tags" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<a href="${s:mvcUrl('HC#hello99').build()}" rel="external nofollow" >Go!</a>
</body>
</html>

@Override
protected HandlerMethod getHandlerInternal(HttpServletRequest request) throws Exception {
	String lookupPath = initLookupPath(request);
	this.mappingRegistry.acquireReadLock();
	try {
		HandlerMethod handlerMethod = lookupHandlerMethod(lookupPath, request);
		return (handlerMethod != null ? handlerMethod.createWithResolvedBean() : null);
	}
	finally {
		this.mappingRegistry.releaseReadLock();
	}
}
protected HandlerMethod lookupHandlerMethod(String lookupPath, HttpServletRequest request) throws Exception {
	List<Match> matches = new ArrayList<>();
	List<T> directPathMatches = this.mappingRegistry.getMappingsByDirectPath(lookupPath);
	if (directPathMatches != null) {
		addMatchingMappings(directPathMatches, matches, request);
	}
	if (matches.isEmpty()) {
		addMatchingMappings(this.mappingRegistry.getRegistrations().keySet(), matches, request);
	}
	if (!matches.isEmpty()) {
		Match bestMatch = matches.get(0);
		if (matches.size() > 1) {
			Comparator<Match> comparator = new MatchComparator(getMappingComparator(request));
			matches.sort(comparator);
			bestMatch = matches.get(0);
			if (CorsUtils.isPreFlightRequest(request)) {
				for (Match match : matches) {
					if (match.hasCorsConfig()) {
						return PREFLIGHT_AMBIGUOUS_MATCH;
					}
				}
			}
			else {
				Match secondBestMatch = matches.get(1);
				if (comparator.compare(bestMatch, secondBestMatch) == 0) {
					Method m1 = bestMatch.getHandlerMethod().getMethod();
					Method m2 = secondBestMatch.getHandlerMethod().getMethod();
					String uri = request.getRequestURI();
					throw new IllegalStateException(
							"Ambiguous handler methods mapped for '" + uri + "': {" + m1 + ", " + m2 + "}");
				}
			}
		}
		request.setAttribute(BEST_MATCHING_HANDLER_ATTRIBUTE, bestMatch.getHandlerMethod());
		handleMatch(bestMatch.mapping, lookupPath, request);
		return bestMatch.getHandlerMethod();
	}
	else {
		return handleNoMatch(this.mappingRegistry.getRegistrations().keySet(), lookupPath, request);
	}
}