今天突然對Spring MVC在web.xml中DispatcherServlet的<servlet-name>和Spring MVC設定檔的名稱及位置是怎麼決定的，所以跑去看原始碼，下面是今天看了一整天大概了解的流程，在此紀錄一下。
但找了半天還是找不到contextConfigLocation是在哪個地方被設定為Spring MVC配置檔的路徑?
-Catalina.start() //Tomcat引擎Catalina啟動
-Server.start()(LifecycleBase.start())
-StandardardContext.startInternal()
-StandardardContext.fireLifecycleEvent()
-LifecycleListener.lifecycleEvent() (ContextConfig.lifecycleEvent())
-ContextConfig.configureStart()
-ContextConfig.webConfig() //解析web.xml
-WebXml.merge()
-WebXml.mergeServlet()
-ServletDef.addInitParameter() 取得<init-param>的設定，例如contextConfigLocation
-ContextConfig.configureContext()
-ServletDef.getParameterMap() 取得參數的設定，例如contextConfigLocation
-StandardardWrapper.addInitParameter(String name, String value) //將Servlet參數放入StandardardWrapper.parameters <---+
-StandardardWrapper.setServletClass() //加入web.xml中的Servlet名稱，一個ServletDef會有一個Wrapper |
-StandardardContext.addServletContainerInitializer() |
-ServletContainerInitializer.onStartup()(SpringServletContainerInitializer.onStartup()) //以程式來設定config |
-AbstractDispatcherServletInitializer.onStartup() |
-AbstractDispatcherServletInitializer.registerDispatcherServlet() |
-AbstractDispatcherServletInitializer.createServletApplicationContext() |
-AbstractDispatcherServletInitializer.createDispatcherServlet() |
-ServletContext.addServlet() |
-StandardardContext.loadOnStartup() |
-StandardardWrapper.load() |
-StandardardWrapper.loadServlet() |
-InstanceManager.newInstance() (DefaultInstanceManager.newInstance()) //根據 web.xml來產生Servlet的實例 |
-StandardWrapper.initServlet() //初始化Servlet |
-Servlet.init()(GenericServlet.init()) |
-HttpServletBean.init() |
-new ServletConfigPropertyValues(getServletConfig(), this.requiredProperties) |
-StandardardWrapper.getInitParameter(String name) |
-StandardardWrapper.findInitParameter(String name) //取出Servlet參數 <-------------------------------------------+
-BeanWrapper.setPropertyValues(PropertyValues pvs, boolean ignoreUnknown)(AbstractPropertyAccessor.setPropertyValues(PropertyValues pvs, boolean ignoreUnknown))
-AbstractPropertyAccessor.setPropertyValues(PropertyValues pvs, boolean ignoreUnknown, boolean ignoreInvalid)
-AbstractPropertyAccessor.setPropertyValue(PropertyValue pv)
-AbstractNestablePropertyAccessor.setPropertyValue(String propertyName, Object value)
-AbstractNestablePropertyAccessor.setPropertyValue(PropertyTokenHolder tokens, PropertyValue pv)
-HttpServletBean.initServletBean()(FrameworkServlet.initServletBean())
-FrameworkServlet.initWebApplicationContext()
-FrameworkServlet.createWebApplicationContext()
-FrameworkServlet.createWebApplicationContext() //建立WebApplicationContext (預設DEFAULT_CONTEXT_CLASS = XmlWebApplicationContext)
-FrameworkServlet.getContextClass()
-return contextClass = DEFAULT_CONTEXT_CLASS = XmlWebApplicationContext.class
-BeanUtils.instantiateClass()
-BeanUtils.instantiateClass()
-FrameworkServlet.getContextConfigLocation()
-FrameworkServlet.setConfigLocation()
-FrameworkServlet.configureAndRefreshWebApplicationContext()
-FrameworkServlet.applyInitializers()
-ApplicationContextInitializer.initialize()
-ConfigurableWebApplicationContext.refresh()(AbstractApplicationContext.refresh())
-ConfigurableListableBeanFactory.obtainFreshBeanFactory()
-AbstractRefreshableApplicationContext.refreshBeanFactory()
-XmlWebApplicationContext.loadBeanDefinitions(DefaultListableBeanFactory beanFactory)
-XmlWebApplicationContext.loadBeanDefinitions(XmlBeanDefinitionReader reader)
-AbstractRefreshableWebApplicationContext.getConfigLocations()()
-AbstractRefreshableConfigApplicationContext.getConfigLocations() //取得contextConfigLocation路徑
-return configLocations // 不知在哪被set?
-XmlWebApplicationContext.getDefaultConfigLocations()
-return new String[] {DEFAULT_CONFIG_LOCATION_PREFIX + getNamespace() + DEFAULT_CONFIG_LOCATION_SUFFIX} //Spring MVC配置檔預設會根據DispatcherServlet的servlet-name前後加上"/WEB-INF/"及".xml"
-DEFAULT_CONFIG_LOCATION_PREFIX = "/WEB-INF/"
-DEFAULT_CONFIG_LOCATION_SUFFIX = ".xml";
-return new String[] {DEFAULT_CONFIG_LOCATION}
-DEFAULT_CONFIG_LOCATION = "/WEB-INF/applicationContext.xml"; //Spring MVC配置檔預設路徑名稱
-XmlBeanDefinitionReader.loadBeanDefinitions(String location)
-AbstractBeanDefinitionReader.loadBeanDefinitions(String location, Set actualResources)
-AbstractBeanDefinitionReader.loadBeanDefinitions(Resource... resources)
-XmlBeanDefinitionReader.loadBeanDefinitions(Resource resource)
-XmlBeanDefinitionReader.loadBeanDefinitions(EncodedResource encodedResource)
-XmlBeanDefinitionReader.doLoadBeanDefinitions(InputSource inputSource, Resource resource)
-XmlBeanDefinitionReader.registerBeanDefinitions(Document doc, Resource resource)
-DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(Document doc, XmlReaderContext readerContext)
-DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(Element root)
-DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(Element root, BeanDefinitionParserDelegate delegate) //解析spring設定檔的bean
-DefaultBeanDefinitionDocumentReader.parseDefaultElement(Element ele, BeanDefinitionParserDelegate delegate)
-DefaultBeanDefinitionDocumentReader.processBeanDefinition(Element ele, BeanDefinitionParserDelegate delegate)
-BeanDefinitionReaderUtils.registerBeanDefinition(BeanDefinitionHolder definitionHolder, BeanDefinitionRegistry registry)
-DefaultListableBeanFactory.registerBeanDefinition(String beanName, BeanDefinition beanDefinition) //註冊bean
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