import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
/**
 * The method scans all beans, that contain methods,
 * annotated as {@link ScheduledBeanMethod}
 */
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
    Class<?> targetClass = AopUtils.getTargetClass(bean);

    Map<Method, Set<ScheduledBeanMethod>> annotatedMethods = MethodIntrospector.selectMethods(targetClass,
            (MethodIntrospector.MetadataLookup<Set<ScheduledBeanMethod>>) method -> {
                Set<ScheduledBeanMethod> scheduledMethods = AnnotatedElementUtils.getMergedRepeatableAnnotations(
                        method, ScheduledBeanMethod.class, ScheduledBeanMethods.class);
                return (!scheduledMethods.isEmpty() ? scheduledMethods : null);
            });

    for (Map.Entry<Method, Set<ScheduledBeanMethod>> entry : annotatedMethods.entrySet()) {
        scheduleAnnotatedMethods.add(new ScheduledMethodContext(beanName, entry.getKey(), entry.getValue()));
    }

    return bean;
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
/**
 * Detect if the given handler has any methods that can handle messages and if
 * so register it with the extracted mapping information.
 * @param handler the handler to check, either an instance of a Spring bean name
 */
protected final void detectHandlerMethods(final Object handler) {
	Class<?> handlerType = (handler instanceof String ?
			this.applicationContext.getType((String) handler) : handler.getClass());
	final Class<?> userType = ClassUtils.getUserClass(handlerType);

	Map<Method, T> methods = MethodIntrospector.selectMethods(userType,
			new MethodIntrospector.MetadataLookup<T>() {
				@Override
				public T inspect(Method method) {
					return getMappingForMethod(method, userType);
				}
			});

	if (logger.isDebugEnabled()) {
		logger.debug(methods.size() + " message handler methods found on " + userType + ": " + methods);
	}
	for (Map.Entry<Method, T> entry : methods.entrySet()) {
		registerHandlerMethod(handler, entry.getKey(), entry.getValue());
	}
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
private static Method getMethod(Class<?> controllerType, final String methodName, final Object... args) {
	MethodFilter selector = new MethodFilter() {
		@Override
		public boolean matches(Method method) {
			String name = method.getName();
			int argLength = method.getParameterTypes().length;
			return (name.equals(methodName) && argLength == args.length);
		}
	};
	Set<Method> methods = MethodIntrospector.selectMethods(controllerType, selector);
	if (methods.size() == 1) {
		return methods.iterator().next();
	}
	else if (methods.size() > 1) {
		throw new IllegalArgumentException(String.format(
				"Found two methods named '%s' accepting arguments %s in controller %s: [%s]",
				methodName, Arrays.asList(args), controllerType.getName(), methods));
	}
	else {
		throw new IllegalArgumentException("No method named '" + methodName + "' with " + args.length +
				" arguments found in controller " + controllerType.getName());
	}
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
/**
 * Look for handler methods in a handler.
 * @param handler the bean name of a handler or a handler instance
 */
protected void detectHandlerMethods(final Object handler) {
	Class<?> handlerType = (handler instanceof String ?
			getApplicationContext().getType((String) handler) : handler.getClass());
	final Class<?> userType = ClassUtils.getUserClass(handlerType);

	Map<Method, T> methods = MethodIntrospector.selectMethods(userType,
			new MethodIntrospector.MetadataLookup<T>() {
				@Override
				public T inspect(Method method) {
					return getMappingForMethod(method, userType);
				}
			});

	if (logger.isDebugEnabled()) {
		logger.debug(methods.size() + " request handler methods found on " + userType + ": " + methods);
	}
	for (Map.Entry<Method, T> entry : methods.entrySet()) {
		registerHandlerMethod(handler, entry.getKey(), entry.getValue());
	}
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
private static Map<Class<? extends Throwable>, Method> initExceptionMappings(Class<?> handlerType) {
	Map<Class<? extends Throwable>, Method> result = new HashMap<Class<? extends Throwable>, Method>();
	for (Method method : MethodIntrospector.selectMethods(handlerType, EXCEPTION_HANDLER_METHOD_FILTER)) {
		for(Class<? extends Throwable> exception : getExceptionsFromMethodSignature(method)) {
			result.put(exception, method);
		}
	}
	return result;
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
/**
 * A constructor that finds {@link ExceptionHandler} methods in the given type.
 * @param handlerType the type to introspect
 */
public ExceptionHandlerMethodResolver(Class<?> handlerType) {
	for (Method method : MethodIntrospector.selectMethods(handlerType, EXCEPTION_HANDLER_METHODS)) {
		for (Class<? extends Throwable> exceptionType : detectExceptionMappings(method)) {
			addExceptionMapping(exceptionType, method);
		}
	}
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
private void runTest(Object controller) throws Exception {
	HandlerMethodArgumentResolverComposite resolvers = new HandlerMethodArgumentResolverComposite();
	resolvers.addResolver(new ModelAttributeMethodProcessor(false));
	resolvers.addResolver(new ModelMethodProcessor());
	WebDataBinderFactory dataBinderFactory = new DefaultDataBinderFactory(null);

	Class<?> type = controller.getClass();
	Set<Method> methods = MethodIntrospector.selectMethods(type, METHOD_FILTER);
	List<InvocableHandlerMethod> modelMethods = new ArrayList<InvocableHandlerMethod>();
	for (Method method : methods) {
		InvocableHandlerMethod modelMethod = new InvocableHandlerMethod(controller, method);
		modelMethod.setHandlerMethodArgumentResolvers(resolvers);
		modelMethod.setDataBinderFactory(dataBinderFactory);
		modelMethods.add(modelMethod);
	}
	Collections.shuffle(modelMethods);

	SessionAttributesHandler sessionHandler = new SessionAttributesHandler(type, this.sessionAttributeStore);
	ModelFactory factory = new ModelFactory(modelMethods, dataBinderFactory, sessionHandler);
	factory.initModel(this.webRequest, this.mavContainer, new HandlerMethod(controller, "handle"));
	if (logger.isDebugEnabled()) {
		StringBuilder sb = new StringBuilder();
		for (String name : getInvokedMethods()) {
			sb.append(" >> ").append(name);
		}
		logger.debug(sb);
	}
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
/**
 * Process the given {@link JmsListener} annotation on the given method,
 * registering a corresponding endpoint for the given bean instance.
 * @param jmsListener the annotation to process
 * @param mostSpecificMethod the annotated method
 * @param bean the instance to invoke the method on
 * @see #createMethodJmsListenerEndpoint()
 * @see JmsListenerEndpointRegistrar#registerEndpoint
 */
protected void processJmsListener(JmsListener jmsListener, Method mostSpecificMethod, Object bean) {
	Method invocableMethod = MethodIntrospector.selectInvocableMethod(mostSpecificMethod, bean.getClass());

	MethodJmsListenerEndpoint endpoint = createMethodJmsListenerEndpoint();
	endpoint.setBean(bean);
	endpoint.setMethod(invocableMethod);
	endpoint.setMostSpecificMethod(mostSpecificMethod);
	endpoint.setMessageHandlerMethodFactory(this.messageHandlerMethodFactory);
	endpoint.setBeanFactory(this.beanFactory);
	endpoint.setId(getEndpointId(jmsListener));
	endpoint.setDestination(resolve(jmsListener.destination()));
	if (StringUtils.hasText(jmsListener.selector())) {
		endpoint.setSelector(resolve(jmsListener.selector()));
	}
	if (StringUtils.hasText(jmsListener.subscription())) {
		endpoint.setSubscription(resolve(jmsListener.subscription()));
	}
	if (StringUtils.hasText(jmsListener.concurrency())) {
		endpoint.setConcurrency(resolve(jmsListener.concurrency()));
	}

	JmsListenerContainerFactory<?> factory = null;
	String containerFactoryBeanName = resolve(jmsListener.containerFactory());
	if (StringUtils.hasText(containerFactoryBeanName)) {
		Assert.state(this.beanFactory != null, "BeanFactory must be set to obtain container factory by bean name");
		try {
			factory = this.beanFactory.getBean(containerFactoryBeanName, JmsListenerContainerFactory.class);
		}
		catch (NoSuchBeanDefinitionException ex) {
			throw new BeanInitializationException("Could not register JMS listener endpoint on [" +
					mostSpecificMethod + "], no " + JmsListenerContainerFactory.class.getSimpleName() +
					" with id '" + containerFactoryBeanName + "' was found in the application context", ex);
		}
	}

	this.registrar.registerEndpoint(endpoint, factory);
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
private <A extends Annotation> Map<Method, Set<A>> findAnnotatedMethods(Class<?> targetClass,
        Class<A> single, Class<? extends Annotation> plural) {
    return MethodIntrospector.selectMethods(targetClass, (MetadataLookup<Set<A>>) method -> {
        Set<A> matsMappingAnnotations = AnnotationUtils.getRepeatableAnnotations(method, single, plural);
        return (!matsMappingAnnotations.isEmpty() ? matsMappingAnnotations : null);
    });
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
public Map<Method, T> getMethods(final Class<?> type, final Class<T> annotationClass){
	return MethodIntrospector.selectMethods(type,
			new MethodIntrospector.MetadataLookup<T>() {
				@Override
				public T inspect(Method method) {
					return AnnotationUtils.findAnnotation(method, annotationClass);
				}
			});
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
private void initControllerAdviceCache() {
	if (getApplicationContext() == null) {
		return;
	}
	if (logger.isInfoEnabled()) {
		logger.info("Looking for @ControllerAdvice: " + getApplicationContext());
	}

	List<ControllerAdviceBean> beans = ControllerAdviceBean.findAnnotatedBeans(getApplicationContext());
	AnnotationAwareOrderComparator.sort(beans);

	List<Object> requestResponseBodyAdviceBeans = new ArrayList<Object>();

	for (ControllerAdviceBean bean : beans) {
		Set<Method> attrMethods = MethodIntrospector.selectMethods(bean.getBeanType(), MODEL_ATTRIBUTE_METHODS);
		if (!attrMethods.isEmpty()) {
			this.modelAttributeAdviceCache.put(bean, attrMethods);
			if (logger.isInfoEnabled()) {
				logger.info("Detected @ModelAttribute methods in " + bean);
			}
		}
		Set<Method> binderMethods = MethodIntrospector.selectMethods(bean.getBeanType(), INIT_BINDER_METHODS);
		if (!binderMethods.isEmpty()) {
			this.initBinderAdviceCache.put(bean, binderMethods);
			if (logger.isInfoEnabled()) {
				logger.info("Detected @InitBinder methods in " + bean);
			}
		}
		if (RequestBodyAdvice.class.isAssignableFrom(bean.getBeanType())) {
			requestResponseBodyAdviceBeans.add(bean);
			if (logger.isInfoEnabled()) {
				logger.info("Detected RequestBodyAdvice bean in " + bean);
			}
		}
		if (ResponseBodyAdvice.class.isAssignableFrom(bean.getBeanType())) {
			requestResponseBodyAdviceBeans.add(bean);
			if (logger.isInfoEnabled()) {
				logger.info("Detected ResponseBodyAdvice bean in " + bean);
			}
		}
	}

	if (!requestResponseBodyAdviceBeans.isEmpty()) {
		this.requestResponseBodyAdvice.addAll(0, requestResponseBodyAdviceBeans);
	}
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
/**
 * Select an invocable method on the target type: either the given method itself
 * if actually exposed on the target type, or otherwise a corresponding method
 * on one of the target type's interfaces or on the target type itself.
 * @param method the method to check
 * @param targetType the target type to search methods on (typically an AOP proxy)
 * @return a corresponding invocable method on the target type
 * @throws IllegalStateException if the given method is not invocable on the given
 * target type (typically due to a proxy mismatch)
 * @since 4.3
 * @see MethodIntrospector#selectInvocableMethod(Method, Class)
 */
public static Method selectInvocableMethod(Method method, Class<?> targetType) {
	Method methodToUse = MethodIntrospector.selectInvocableMethod(method, targetType);
	if (Modifier.isPrivate(methodToUse.getModifiers()) && !Modifier.isStatic(methodToUse.getModifiers()) &&
			SpringProxy.class.isAssignableFrom(targetType)) {
		throw new IllegalStateException(String.format(
				"Need to invoke method '%s' found on proxy for target class '%s' but cannot " +
				"be delegated to target bean. Switch its visibility to package or protected.",
				method.getName(), method.getDeclaringClass().getSimpleName()));
	}
	return methodToUse;
}
 

import org.springframework.core.MethodIntrospector; //导入依赖的package包/类
/**
 * Select handler methods for the given handler type.
 * <p>Callers define handler methods of interest through the {@link MethodFilter} parameter.
 * @param handlerType the handler type to search handler methods on
 * @param handlerMethodFilter a {@link MethodFilter} to help recognize handler methods of interest
 * @return the selected methods, or an empty set
 * @see MethodIntrospector#selectMethods(Class, MethodFilter)
 */
public static Set<Method> selectMethods(Class<?> handlerType, MethodFilter handlerMethodFilter) {
	return MethodIntrospector.selectMethods(handlerType, handlerMethodFilter);
}