在MainServlet中，初始化插件包之后，就开始初始化Portlets:
对应的代码是：
if (_log.isDebugEnabled()) { _log.debug("Initialize portlets"); } List<Portlet> portlets = null; try { portlets = initPortlets(pluginPackage); } ...它会去调用initPortlets方法，并且传入一个我们上一步刚初始化的核心pluginPackage,我们来细看它究竟做了哪些事情:
读取配置文件：
首先，它去取得servletContext,然后获取一组xml配置文件：
protected List<Portlet> initPortlets(PluginPackage pluginPackage) throws Exception { ServletContext servletContext = getServletContext(); String[] xmls = new String[] { HttpUtil.URLtoString( servletContext.getResource( "/WEB-INF/" + Portal.PORTLET_XML_FILE_NAME_CUSTOM)), HttpUtil.URLtoString( servletContext.getResource("/WEB-INF/portlet-ext.xml")), HttpUtil.URLtoString( servletContext.getResource("/WEB-INF/liferay-portlet.xml")), HttpUtil.URLtoString( servletContext.getResource("/WEB-INF/liferay-portlet-ext.xml")), HttpUtil.URLtoString( servletContext.getResource("/WEB-INF/web.xml")) }; ....这些xml配置文件中，我研究了下，大概是提供如下的功能。
portlet_custom.xml可以用来根据请求的p_p_id字段，到这个文件中找到相应的portlet的<init-param>的<view-action>元素，然后去struts-config.xml中找到action的配置信息，最终到tiles-config.xml中找到对应的页面信息。
portlet-ext.xml,定义了portlet的初始化信息。
liferay-portlet.xml，定义了portlet在liferay框架中的一般外观信息
liferay-portlet-ext.xml,定义了portlet在liferay框架中的模板和是否允许重复。
初始化EAR:
然后，调用以下代码来初始化：
PortletLocalServiceUtil.initEAR(servletContext, xmls, pluginPackage);它最终会调用PortletLocalServiceImpl的initEAR方法：
public void initEAR( ServletContext servletContext, String[] xmls, PluginPackage pluginPackage) { // Clear pools every time initEAR is called. See LEP-5452. portletLocalService.clearCompanyPortletsPool(); _portletAppsPool.clear(); _portletsPool.clear(); _portletIdsByStrutsPath.clear(); _friendlyURLMapperPortlets.clear(); Map<String, Portlet> portletsPool = _getPortletsPool(); try { Set<String> servletURLPatterns = _readWebXML(xmls[4]); Set<String> portletIds = _readPortletXML( servletContext, xmls[0], portletsPool, servletURLPatterns, pluginPackage); portletIds.addAll( _readPortletXML( servletContext, xmls[1], portletsPool, servletURLPatterns, pluginPackage)); Set<String> liferayPortletIds = _readLiferayPortletXML(xmls[2], portletsPool); liferayPortletIds.addAll( _readLiferayPortletXML(xmls[3], portletsPool)); // Check for missing entries in liferay-portlet.xml for (String portletId : portletIds) { if (_log.isWarnEnabled() && !liferayPortletIds.contains(portletId)) { _log.warn( "Portlet with the name " + portletId + " is described in portlet.xml but does not " + "have a matching entry in liferay-portlet.xml"); } } // Check for missing entries in portlet.xml for (String portletId : liferayPortletIds) { if (_log.isWarnEnabled() && !portletIds.contains(portletId)) { _log.warn( "Portlet with the name " + portletId + " is described in liferay-portlet.xml but does " + "not have a matching entry in portlet.xml"); } } // Remove portlets that should not be included Iterator<Map.Entry<String, Portlet>> portletPoolsItr = portletsPool.entrySet().iterator(); while (portletPoolsItr.hasNext()) { Map.Entry<String, Portlet> entry = portletPoolsItr.next(); Portlet portletModel = entry.getValue(); if (!portletModel.getPortletId().equals(PortletKeys.ADMIN) && !portletModel.getPortletId().equals( PortletKeys.MY_ACCOUNT) && !portletModel.isInclude()) { portletPoolsItr.remove(); _friendlyURLMapperPortlets.remove( portletModel.getPortletId()); } } // Sprite images PortletApp portletApp = _getPortletApp(StringPool.BLANK); _setSpriteImages(servletContext, portletApp, "/html/icons/"); } catch (Exception e) { _log.error(e, e); } }