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... 生成默认ID
			wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
					ObjectUtils.getDisplayString(getServletContext().getContextPath()) + '/' + getServletName());
		}
	}

	wac.setServletContext(getServletContext());
	wac.setServletConfig(getServletConfig());
	wac.setNamespace(getNamespace());
	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);
	// 遍历 ApplicationContextInitializer，执行 initialize 方法
	applyInitializers(wac);
	// 关键的刷新，加载配置文件及整合 parent 到 wac
	wac.refresh();
}
 

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...
			wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
					ObjectUtils.getDisplayString(getServletContext().getContextPath()) + '/' + getServletName());
		}
	}

	wac.setServletContext(getServletContext());
	wac.setServletConfig(getServletConfig());
	wac.setNamespace(getNamespace());
	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);
	applyInitializers(wac);
	wac.refresh();
}
 

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...
			wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
					ObjectUtils.getDisplayString(getServletContext().getContextPath()) + '/' + getServletName());
		}
	}

	wac.setServletContext(getServletContext());
	wac.setServletConfig(getServletConfig());
	wac.setNamespace(getNamespace());
	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);
	applyInitializers(wac);
	wac.refresh();
}
 

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...
			wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
					ObjectUtils.getDisplayString(getServletContext().getContextPath()) + "/" + getServletName());
		}
	}

	wac.setServletContext(getServletContext());
	wac.setServletConfig(getServletConfig());
	wac.setNamespace(getNamespace());
	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);
	applyInitializers(wac);
	wac.refresh();
}
 

/**
 * Instantiate the Portlet ApplicationContext for this portlet, either a default
 * XmlPortletApplicationContext or a custom context class if set.
 * <p>This implementation expects custom contexts to implement
 * ConfigurablePortletApplicationContext. Can be overridden in subclasses.
 * @param parent the parent ApplicationContext to use, or null if none
 * @return the Portlet ApplicationContext for this portlet
 * @see #setContextClass
 * @see org.springframework.web.portlet.context.XmlPortletApplicationContext
 */
protected ApplicationContext createPortletApplicationContext(ApplicationContext parent) {
	Class<?> contextClass = getContextClass();
	if (logger.isDebugEnabled()) {
		logger.debug("Portlet with name '" + getPortletName() +
				"' will try to create custom ApplicationContext context of class '" +
				contextClass.getName() + "'" + ", using parent context [" + parent + "]");
	}
	if (!ConfigurablePortletApplicationContext.class.isAssignableFrom(contextClass)) {
		throw new ApplicationContextException("Fatal initialization error in portlet with name '" + getPortletName() +
				"': custom ApplicationContext class [" + contextClass.getName() +
				"] is not of type ConfigurablePortletApplicationContext");
	}
	ConfigurablePortletApplicationContext pac =
			(ConfigurablePortletApplicationContext) BeanUtils.instantiateClass(contextClass);

	// Assign the best possible id value.
	String portletContextName = getPortletContext().getPortletContextName();
	if (portletContextName != null) {
		pac.setId(ConfigurablePortletApplicationContext.APPLICATION_CONTEXT_ID_PREFIX + portletContextName + "." + getPortletName());
	}
	else {
		pac.setId(ConfigurablePortletApplicationContext.APPLICATION_CONTEXT_ID_PREFIX + getPortletName());
	}

	pac.setEnvironment(getEnvironment());
	pac.setParent(parent);
	pac.setPortletContext(getPortletContext());
	pac.setPortletConfig(getPortletConfig());
	pac.setNamespace(getNamespace());
	pac.setConfigLocation(getContextConfigLocation());
	pac.addApplicationListener(new SourceFilteringListener(pac, this));

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

	postProcessPortletApplicationContext(pac);
	pac.refresh();

	return pac;
}