spring源码学习系列3-springmvc原理

问题：
springmvc是如何控制浏览器显示与返回的modelAndView是一致的,而不是一个用户请求的数据返回给了另一个人?
response中存有客户端的信息

分析DispatcherServlet调用效率
springmvc应用大量缓存来提高其工作效率

springmvc的分发器设计的借鉴意义?
一些特殊url不走springmvc,需单独设计servlet,可以借鉴spring是如何封装请求的,要做哪些处理

controller可以应用aop吗,拦截器与aop有什么区别和相同之处?

spring版本3.2.2


核心接口：
DispatcherServlet

HandlerExecutionChain

HandlerAdapter



1.springmvc启动入口
GenericServlet#init(ServletConfig config)->httpServletBean#init

2.springmvc访问入口
HttpServlet#service->FrameworkServlet#&doGet&doPost->FrameworkServlet#processRequest->DispatcherServlet#doService->DispatcherServlet#doDispatch




1.springmvc启动入口
首先在项目web.xml中配置,springmvc的servlet

<servlet>  
        <servlet-name>SpringMVC</servlet-name>  
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
        <init-param>  
            <param-name>contextConfigLocation</param-name>  
            <param-value>classpath*:spring-mvc.xml</param-value>  
        </init-param>  
    </servlet>  
      
    <servlet-mapping>  
        <servlet-name>SpringMVC</servlet-name>  
        <url-pattern>/</url-pattern>  
    </servlet-mapping>  

注意：这里<url-pattern>应该配置/，表示其他默认servlet没有找到的路径都交由DispatcherServlet处理。如果配置成了/*,那么会拦截所有请求包括.jsp,.js,.css等,访问.jsp时由于找不到默认的handler将无法访问页面。
讲到其他默认servlet找不到的路径，由DispatcherServlet处理,那么有哪些默认servlet呢,到TOMCAT_HOME/conf/web.xml下,

    <!-- The mapping for the default servlet -->
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- The mappings for the JSP servlet -->
    <servlet-mapping>
        <servlet-name>jsp</servlet-name>
        <url-pattern>*.jsp</url-pattern>
        <url-pattern>*.jspx</url-pattern>
    </servlet-mapping>

其实DispatcherServlet覆盖的就是default,而jsp servlet拦截了.jsp后缀的访问路径

学习springmvc的过程中,意识到访问.jsp时,不走DispatcherServlet,不觉对.jsp的访问入口感到好奇,进而了解了到相关的知识点。


Class DispatcherServlet

java.lang.Object
javax.servlet.GenericServlet
javax.servlet.http.HttpServlet
org.springframework.web.servlet.HttpServletBean
org.springframework.web.servlet.FrameworkServlet
org.springframework.web.servlet.DispatcherServlet
All Implemented Interfaces:
Serializable, Servlet, ServletConfig, Aware, ApplicationContextAware, EnvironmentAware, EnvironmentCapable

DispatcherServlet本质上是servlet,根据servlet生命周期,首先会执行init方法
httpServletBean#init

/**
	 * Map config parameters onto bean properties of this servlet, and
	 * invoke subclass initialization.
	 * @throws ServletException if bean properties are invalid (or required
	 * properties are missing), or if subclass initialization fails.
	 */
	@Override
	public final void init() throws ServletException {
		if (logger.isDebugEnabled()) {
			logger.debug("Initializing servlet '" + getServletName() + "'");
		}

		// Set bean properties from init parameters.
		try {
//获取属性,web.xml配置的init-param。spring中一般通过beanWrapper设置属性,BeanWrapper封装了实例的反射方法
			PropertyValues pvs = new ServletConfigPropertyValues(getServletConfig(), this.requiredProperties);
			BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(this);
			ResourceLoader resourceLoader = new ServletContextResourceLoader(getServletContext());
//注册属性编辑器,如contextConfigLocation。目标对象是Resource可以直接在xml定义这个Resource为String类型
//DispatcherServlet中并没有定义为Resource类型的属性,所以这里也就用不到这个属性编辑器
			bw.registerCustomEditor(Resource.class, new ResourceEditor(resourceLoader, getEnvironment()));
			initBeanWrapper(bw);
//初始化属性
			bw.setPropertyValues(pvs, true);
		}
		catch (BeansException ex) {
			logger.error("Failed to set bean properties on servlet '" + getServletName() + "'", ex);
			throw ex;
		}
//初始化web环境
		// Let subclasses do whatever initialization they like.
		initServletBean();

		if (logger.isDebugEnabled()) {
			logger.debug("Servlet '" + getServletName() + "' configured successfully");
		}
	}

//初始化web环境
FrameworkServlet#initServletBean

/**
	 * Overridden method of {@link HttpServletBean}, invoked after any bean properties
	 * have been set. Creates this servlet's WebApplicationContext.
	 */
	@Override
	protected final void initServletBean() throws ServletException {
		getServletContext().log("Initializing Spring FrameworkServlet '" + getServletName() + "'");
		if (this.logger.isInfoEnabled()) {
			this.logger.info("FrameworkServlet '" + getServletName() + "': initialization started");
		}
		long startTime = System.currentTimeMillis();

		try {
//1 创建servletContext上下文环境
			this.webApplicationContext = initWebApplicationContext();
//2 提供给子类初始化的扩展点
			initFrameworkServlet();
		}
		catch (ServletException ex) {
			this.logger.error("Context initialization failed", ex);
			throw ex;
		}
		catch (RuntimeException ex) {
			this.logger.error("Context initialization failed", ex);
			throw ex;
		}

		if (this.logger.isInfoEnabled()) {
			long elapsedTime = System.currentTimeMillis() - startTime;
			this.logger.info("FrameworkServlet '" + getServletName() + "': initialization completed in " +
					elapsedTime + " ms");
		}
	}

FrameworkServlet#initWebApplicationContext

protected WebApplicationContext initWebApplicationContext() {
		WebApplicationContext rootContext =
				WebApplicationContextUtils.getWebApplicationContext(getServletContext());
		WebApplicationContext wac = null;

		if (this.webApplicationContext != null) {
			// A context instance was injected at construction time -> use it
			wac = this.webApplicationContext;
			if (wac instanceof ConfigurableWebApplicationContext) {
				ConfigurableWebApplicationContext cwac = (ConfigurableWebApplicationContext) wac;
				if (!cwac.isActive()) {
					// The context has not yet been refreshed -> provide services such as
					// setting the parent context, setting the application context id, etc
					if (cwac.getParent() == null) {
						// The context instance was injected without an explicit parent -> set
						// the root application context (if any; may be null) as the parent
						cwac.setParent(rootContext);
					}
					configureAndRefreshWebApplicationContext(cwac);
				}
			}
		}
		if (wac == null) {
			// No context instance was injected at construction time -> see if one
			// has been registered in the servlet context. If one exists, it is assumed
			// that the parent context (if any) has already been set and that the
			// user has performed any initialization such as setting the context id
//根据属性contextAttr返回context,若未设置contextAttr为空,返回空
			wac = findWebApplicationContext();
		}
		if (wac == null) {
			// No context instance is defined for this servlet -> create a local one
//1.1 创建并初始化servletContext(XmlWebApplicationContext)
			wac = createWebApplicationContext(rootContext);
		}

		if (!this.refreshEventReceived) {
			// Either the context is not a ConfigurableApplicationContext with refresh
			// support or the context injected at construction time had already been
			// refreshed -> trigger initial onRefresh manually here.
			onRefresh(wac);
		}

		if (this.publishContext) {
			// Publish the context as a servlet context attribute.
			String attrName = getServletContextAttributeName();
			getServletContext().setAttribute(attrName, wac);
			if (this.logger.isDebugEnabled()) {
				this.logger.debug("Published WebApplicationContext of servlet '" + getServletName() +
						"' as ServletContext attribute with name [" + attrName + "]");
			}
		}

		return wac;
	}

FrameworkServlet#createWebApplicationContext

protected WebApplicationContext createWebApplicationContext(WebApplicationContext parent) {
		return createWebApplicationContext((ApplicationContext) parent);
	}

FrameworkServlet#createWebApplicationContext

/**
	 * Instantiate the WebApplicationContext for this servlet, either a default
	 * {@link org.springframework.web.context.support.XmlWebApplicationContext}
	 * or a {@link #setContextClass custom context class}, if set.
	 * <p>This implementation expects custom contexts to implement the
	 * {@link org.springframework.web.context.ConfigurableWebApplicationContext}
	 * interface. Can be overridden in subclasses.
	 * <p>Do not forget to register this servlet instance as application listener on the
	 * created context (for triggering its {@link #onRefresh callback}, and to call
	 * {@link org.springframework.context.ConfigurableApplicationContext#refresh()}
	 * before returning the context instance.
	 * @param parent the parent ApplicationContext to use, or {@code null} if none
	 * @return the WebApplicationContext for this servlet
	 * @see org.springframework.web.context.support.XmlWebApplicationContext
	 */
	protected WebApplicationContext createWebApplicationContext(ApplicationContext parent) {
// 1.1.1 实例化容器类XmlWebApplicationContext
// 扩展-可以自定义WebApplicationContext,默认是XmlWebApplication
		Class<?> contextClass = getContextClass();
		if (this.logger.isDebugEnabled()) {
			this.logger.debug("Servlet with name '" + getServletName() +
					"' will try to create custom WebApplicationContext context of class '" +
					contextClass.getName() + "'" + ", using parent context [" + parent + "]");
		}
		if (!ConfigurableWebApplicationContext.class.isAssignableFrom(contextClass)) {
			throw new ApplicationContextException(
					"Fatal initialization error in servlet with name '" + getServletName() +
					"': custom WebApplicationContext class [" + contextClass.getName() +
					"] is not of type ConfigurableWebApplicationContext");
		}
		ConfigurableWebApplicationContext wac =
				(ConfigurableWebApplicationContext) BeanUtils.instantiateClass(contextClass);

// 1.1.2 初始化容器类XmlWebApplicationContext
		wac.setEnvironment(getEnvironment());
		wac.setParent(parent);
		wac.setConfigLocation(getContextConfigLocation());

		configureAndRefreshWebApplicationContext(wac);

		return wac;
	}

扩展-自定义WebApplicationContext


FrameworkServlet#configureAndRefreshWebApplicationContext

protected void configureAndRefreshWebApplicationContext(ConfigurableWebApplicationContext wac) {
		if (ObjectUtils.identityToString(wac).equals(wac.getId())) {
			// The application context id is still set to its original default value
			// -> assign a more useful id based on available information
			if (this.contextId != null) {
				wac.setId(this.contextId);
			}
			else {
				// Generate default id...
				ServletContext sc = getServletContext();
				if (sc.getMajorVersion() == 2 && sc.getMinorVersion() < 5) {
					// Servlet <= 2.4: resort to name specified in web.xml, if any.
					String servletContextName = sc.getServletContextName();
					if (servletContextName != null) {
						wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX + servletContextName +
								"." + getServletName());
					}
					else {
						wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX + getServletName());
					}
				}
				else {
					// Servlet 2.5's getContextPath available!
					wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
							ObjectUtils.getDisplayString(sc.getContextPath()) + "/" + getServletName());
				}
			}
		}

		wac.setServletContext(getServletContext());
		wac.setServletConfig(getServletConfig());
		wac.setNamespace(getNamespace());
//定义并注册applicationListener,context初始化结束时调用。以便回调FrameworkServlet#onRefresh
		wac.addApplicationListener(new SourceFilteringListener(wac, new ContextRefreshListener()));

		// The wac environment's #initPropertySources will be called in any case when the context
		// is refreshed; do it eagerly here to ensure servlet property sources are in place for
		// use in any post-processing or initialization that occurs below prior to #refresh
		ConfigurableEnvironment env = wac.getEnvironment();
		if (env instanceof ConfigurableWebEnvironment) {
			((ConfigurableWebEnvironment) env).initPropertySources(getServletContext(), getServletConfig());
		}

		postProcessWebApplicationContext(wac);
//扩展-servlet设置参数globalInitializerClasses,调用ApplicationContextInitializer#initialize
		applyInitializers(wac);
//解析并初始化配置文件(如：spring-servlet.xml)中的配置
//具体见：http://newjava-sina-cn.iteye.com/blog/2369741
		wac.refresh();
	}

创建容器
====================================职责分界线==============================
在容器中初始化springmvc信息

XmlWebApplicationContext#refresh

DispatcherServlet#doService

对于这些父子类分工合作的类而言，最终子类总是实现最核心的部分,而其父类则很多是一些环境准备或初始化工作。用户可以自定义这些子类,沿用相似的自定义继承架构



监听器回调-初始化springmvc信息-springmvc核心
DispatcherServlet#onRefresh

/**
	 * This implementation calls {@link #initStrategies}.
	 */
	@Override
	protected void onRefresh(ApplicationContext context) {
		initStrategies(context);
	}

	/**
	 * Initialize the strategy objects that this servlet uses.
	 * <p>May be overridden in subclasses in order to initialize further strategy objects.
	 */
	protected void initStrategies(ApplicationContext context) {
		initMultipartResolver(context);
		initLocaleResolver(context);
		initThemeResolver(context);
//初始化映射处理器 handlerMappings
		initHandlerMappings(context);
//初始化适配器处理器
		initHandlerAdapters(context);
		initHandlerExceptionResolvers(context);
		initRequestToViewNameTranslator(context);
//初始化视图解析器 viewResolvers
		initViewResolvers(context);
		initFlashMapManager(context);
	}

2.springmvc访问入口
以doPost为例
FrameworkServlet#doPost

/**
	 * Delegate POST requests to {@link #processRequest}.
	 * @see #doService
	 */
	@Override
	protected final void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
//1 http请求统一转给processRequest处理
		processRequest(request, response);
	}

FrameworkServlet#processRequest

/**
	 * Process this request, publishing an event regardless of the outcome.
	 * <p>The actual event handling is performed by the abstract
	 * {@link #doService} template method.
	 */
	protected final void processRequest(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		long startTime = System.currentTimeMillis();
		Throwable failureCause = null;

//1.1 绑定请求信息到当前线程
//创建localeContext
		LocaleContext previousLocaleContext = LocaleContextHolder.getLocaleContext();
// zh_CN
		LocaleContext localeContext = buildLocaleContext(request);

//创建requestAttributes
		RequestAttributes previousAttributes = RequestContextHolder.getRequestAttributes();
		ServletRequestAttributes requestAttributes = buildRequestAttributes(request, response, previousAttributes);

//Spring 中的WebAsyncManager 有什么应用场景？
//https://segmentfault.com/q/1010000009403867/a-1020000009411777
		WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);
		asyncManager.registerCallableInterceptor(FrameworkServlet.class.getName(), new RequestBindingInterceptor());

//将请求信息绑定到当前线程
		initContextHolders(request, localeContext, requestAttributes);

		try {
//1.2 处理请求信息
			doService(request, response);
		}
		catch (ServletException ex) {
			failureCause = ex;
			throw ex;
		}
		catch (IOException ex) {
			failureCause = ex;
			throw ex;
		}
		catch (Throwable ex) {
			failureCause = ex;
			throw new NestedServletException("Request processing failed", ex);
		}

		finally {
			resetContextHolders(request, previousLocaleContext, previousAttributes);
			if (requestAttributes != null) {
				requestAttributes.requestCompleted();
			}

			if (logger.isDebugEnabled()) {
				if (failureCause != null) {
					this.logger.debug("Could not complete request", failureCause);
				}
				else {
					if (asyncManager.isConcurrentHandlingStarted()) {
						logger.debug("Leaving response open for concurrent processing");
					}
					else {
						this.logger.debug("Successfully completed request");
					}
				}
			}

			publishRequestHandledEvent(request, startTime, failureCause);
		}
	}

DispatcherServlet#doService

//由中文注释可知,设置特殊的request attributes并代理doDispatch处理
/**
	 * Exposes the DispatcherServlet-specific request attributes and delegates to {@link #doDispatch}
	 * for the actual dispatching.
	 */
	@Override
	protected void doService(HttpServletRequest request, HttpServletResponse response) throws Exception {
		if (logger.isDebugEnabled()) {
			String resumed = WebAsyncUtils.getAsyncManager(request).hasConcurrentResult() ? " resumed" : "";
			logger.debug("DispatcherServlet with name '" + getServletName() + "'" + resumed +
					" processing " + request.getMethod() + " request for [" + getRequestUri(request) + "]");
		}

//如父jsp页面包含<jsp:include page="${basePath}login.do?method=getIncludePage"></jsp:include>。父页面请求login.do?method=getIncludePage路径时,则属性中包含javax.servlet.include.request_uri等include页面信息的相关属性
// 缓存这些include页面相关属性,防止处理器改变这些信息。在处理器处理完成后,如果属性值发生变化则恢复restoreAttributesAfterInclude(request, attributesSnapshot);
		// Keep a snapshot of the request attributes in case of an include,
		// to be able to restore the original attributes after the include.
		Map<String, Object> attributesSnapshot = null;
		if (WebUtils.isIncludeRequest(request)) {
			attributesSnapshot = new HashMap<String, Object>();
			Enumeration<?> attrNames = request.getAttributeNames();
			while (attrNames.hasMoreElements()) {
				String attrName = (String) attrNames.nextElement();
				if (this.cleanupAfterInclude || attrName.startsWith("org.springframework.web.servlet")) {
					attributesSnapshot.put(attrName, request.getAttribute(attrName));
				}
			}
		}

		// Make framework objects available to handlers and view objects.
		request.setAttribute(WEB_APPLICATION_CONTEXT_ATTRIBUTE, getWebApplicationContext());
// spring mvc支持页面显示的国际化配置
//涉及的spring元素:<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
//ResourceBundleMessageSource  CookieLocaleResolver
//<spring:message code=""/> <fmt:message key="" />
//参考:http://blog.lifw.org/post/26098052
		request.setAttribute(LOCALE_RESOLVER_ATTRIBUTE, this.localeResolver);
// spring mvc支持主题
//涉及的spring元素:<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
//ResourceBundleThemeSource,SessionThemeResolver
//<spring:theme code=''/>
		request.setAttribute(THEME_RESOLVER_ATTRIBUTE, this.themeResolver);
		request.setAttribute(THEME_SOURCE_ATTRIBUTE, getThemeSource());

//获取前一次request中设置的flashAttribute
//https://t.hao0.me/spring/2016/01/15/spring-flash-map.html
		FlashMap inputFlashMap = this.flashMapManager.retrieveAndUpdate(request, response);
		if (inputFlashMap != null) {
			request.setAttribute(INPUT_FLASH_MAP_ATTRIBUTE, Collections.unmodifiableMap(inputFlashMap));
		}
//将值保存到request中。这样就不需要通过浏览器跳转组装链接来传递参数了
//如：
//1-flashAttribute
//redirectAttributes.addFlashAttribute("message", "Submit successfully!");
//redirect:url 
//2-没有flashAttribute
//redirect:url+"?" + successMsg=
		request.setAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE, new FlashMap());
		request.setAttribute(FLASH_MAP_MANAGER_ATTRIBUTE, this.flashMapManager);

		try {
//springmvc转发请求的核心方法
			doDispatch(request, response);
		}
		finally {
			if (!WebAsyncUtils.getAsyncManager(request).isConcurrentHandlingStarted()) {
				// Restore the original attribute snapshot, in case of an include.
				if (attributesSnapshot != null) {
					restoreAttributesAfterInclude(request, attributesSnapshot);
				}
			}
		}
	}

DispatcherServlet#doDispatch

protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception {
		HttpServletRequest processedRequest = request;
		HandlerExecutionChain mappedHandler = null;
		boolean multipartRequestParsed = false;

		WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);

		try {
			ModelAndView mv = null;
			Exception dispatchException = null;

			try {
				processedRequest = checkMultipart(request);
				multipartRequestParsed = (processedRequest != request);

//1 获取执行请求的链HandlerExecutionChain(包括controller和拦截器)
				// Determine handler for the current request.
				mappedHandler = getHandler(processedRequest, false);
				if (mappedHandler == null || mappedHandler.getHandler() == null) {
					noHandlerFound(processedRequest, response);
					return;
				}

				// Determine handler adapter for the current request.
//2 获取执行handler的适配器
				HandlerAdapter ha = getHandlerAdapter(mappedHandler.getHandler());

				// Process last-modified header, if supported by the handler.
				String method = request.getMethod();
				boolean isGet = "GET".equals(method);
				if (isGet || "HEAD".equals(method)) {
					long lastModified = ha.getLastModified(request, mappedHandler.getHandler());
					if (logger.isDebugEnabled()) {
						logger.debug("Last-Modified value for [" + getRequestUri(request) + "] is: " + lastModified);
					}
					if (new ServletWebRequest(request, response).checkNotModified(lastModified) && isGet) {
						return;
					}
				}

//3 执行拦截器的preHandle,如：未登录直接返回
				if (!mappedHandler.applyPreHandle(processedRequest, response)) {
					return;
				}

//4 执行用户定义的业务逻辑
// 见<spring源码学习系列3.2-handlerAdapter执行>
				// Actually invoke the handler.
				mv = ha.handle(processedRequest, response, mappedHandler.getHandler());

				if (asyncManager.isConcurrentHandlingStarted()) {
					return;
				}

				applyDefaultViewName(request, mv);
//5 执行拦截器的postHandle
				mappedHandler.applyPostHandle(processedRequest, response, mv);
			}
			catch (Exception ex) {
				dispatchException = ex;
			}
			processDispatchResult(processedRequest, response, mappedHandler, mv, dispatchException);
		}
		catch (Exception ex) {
			triggerAfterCompletion(processedRequest, response, mappedHandler, ex);
		}
		catch (Error err) {
			triggerAfterCompletionWithError(processedRequest, response, mappedHandler, err);
		}
		finally {
			if (asyncManager.isConcurrentHandlingStarted()) {
				// Instead of postHandle and afterCompletion
				if (mappedHandler != null) {
					mappedHandler.applyAfterConcurrentHandlingStarted(processedRequest, response);
				}
			}
			else {
				// Clean up any resources used by a multipart request.
				if (multipartRequestParsed) {
					cleanupMultipart(processedRequest);
				}
			}
		}
	}

DispatcherServlet#getHandler

protected HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception {
		for (HandlerMapping hm : this.handlerMappings) {
			if (logger.isTraceEnabled()) {
				logger.trace(
						"Testing handler map [" + hm + "] in DispatcherServlet with name '" + getServletName() + "'");
			}
//1.1 委托handlerMapping获取HandlerExecutionChain
			HandlerExecutionChain handler = hm.getHandler(request);
			if (handler != null) {
				return handler;
			}
		}
		return null;
	}

AbstractHandlerMapping#getHandler

public final HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception {
//1.1.1 获取默认HandlerExecutionChain(包括controller和默认interceptor)
		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 = getApplicationContext().getBean(handlerName);
		}
//1.1.2 springmvc扩展点-HandlerExecutionChain添加其他自定义的interceoptor
		return getHandlerExecutionChain(handler, request);
	}

AbstractHandlerMapping#getHandlerExecutionChain-执行链中添加自定义拦截器

protected HandlerExecutionChain getHandlerExecutionChain(Object handler, HttpServletRequest request) {
		HandlerExecutionChain chain = (handler instanceof HandlerExecutionChain ?
				(HandlerExecutionChain) handler : new HandlerExecutionChain(handler));
//1.1.2.1 abstractHandlerMapping.adaptedInterceptors属性
//abstractHandlerMapping.interceptoers转化而来,见<spring源码学习系列3.1-handlerMapping初始化>
		chain.addInterceptors(getAdaptedInterceptors());

		String lookupPath = this.urlPathHelper.getLookupPathForRequest(request);
//1.1.2.2 abstractHandlerMapping.mappedInterceptor属性
//<mvc:interceptor/>和abstractHandlerMapping.interceptoers转化而来
		for (MappedInterceptor mappedInterceptor : this.mappedInterceptors) {
			if (mappedInterceptor.matches(lookupPath, this.pathMatcher)) {
				chain.addInterceptor(mappedInterceptor.getInterceptor());
			}
		}

		return chain;
	}

参考：
Spring IOC BeanWrapper
http://www.infocool.net/kb/Other/201611/227714.html

Spring IOC BeanWrapper
http://blog.csdn.net/u012410733/article/details/53346345

SpringMVC源码剖析（一）- 从抽象和接口说起
https://my.oschina.net/lichhao/blog/99039?p=2&temp=1494051282915#blog-comments-list

WEB请求处理五：MVC框架请求处理
http://www.jianshu.com/p/6462e69ce241

困惑：谁能帮我解答一个关于BeanWrapperImpl设计的问题
http://stamen.iteye.com/blog/43048

你真的了解DispatcherServlet的url-pattern配置吗?
http://www.itwendao.com/article/detail/382888.html

SpingMVC第一个拦截器未执行BUG分析
http://uuhorse.iteye.com/blog/2311494
http://www.cnblogs.com/gkaigk1987/articles/5466052.html

handlerAdapter
http://www.cnblogs.com/wade-luffy/p/6085172.html


http://www.cnblogs.com/JemBai/archive/2010/01/07/1641048.html
http://blog.csdn.net/u012420654/article/details/58687790