MainServlet中，当初始化社交结束之后，就开始初始化主题了，对应代码是： if (_log.isDebugEnabled()) { _log.debug("Initialize themes"); } try { initThemes(pluginPackage, portlets); } ..
它对应的代码在initThemes方法中：
protected void initThemes( PluginPackage pluginPackage, List<Portlet> portlets) throws Exception { ServletContext servletContext = getServletContext(); String[] xmls = new String[] { HttpUtil.URLtoString( servletContext.getResource( "/WEB-INF/liferay-look-and-feel.xml")), HttpUtil.URLtoString( servletContext.getResource( "/WEB-INF/liferay-look-and-feel-ext.xml")) }; ThemeLocalServiceUtil.init( servletContext, null, true, xmls, pluginPackage); }这里可以看出，它仍然是先获取servletContext,然后获得theme有关的配置文件，然后从第16行开始来解析这些配置文件：
解析是调用ThemLocalServiceUtil的init方法：
public static java.util.List<java.lang.String> init( javax.servlet.ServletContext servletContext, java.lang.String themesPath, boolean loadFromServletContext, java.lang.String[] xmls, com.liferay.portal.kernel.plugin.PluginPackage pluginPackage) { return getService() .init(servletContext, themesPath, loadFromServletContext, xmls, pluginPackage); }作为封装，实际是调用的ThemeLocalServiceImpl的5参数的init方法，而它又调用重载的6参数的init方法：
public List<String> init( String servletContextName, ServletContext servletContext, String themesPath, boolean loadFromServletContext, String[] xmls, PluginPackage pluginPackage) { List<String> themeIdsList = new ArrayList<String>(); try { for (String xml : xmls) { Set<String> themeIds = _readThemes( servletContextName, servletContext, themesPath, loadFromServletContext, xml, pluginPackage); for (String themeId : themeIds) { if (!themeIdsList.contains(themeId)) { themeIdsList.add(themeId); } } } } catch (Exception e) { e.printStackTrace(); } _themesPool.clear(); return themeIdsList; }