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&lt;hr color=red&gt;</description><language>zh-cn</language><lastBuildDate>Tue, 27 Feb 2007 11:24:49 GMT</lastBuildDate><pubDate>Tue, 27 Feb 2007 11:24:49 GMT</pubDate><ttl>60</ttl><item><title>Liferay Portal�pȝ��架构�Ҏ(gu��)�� </title><link>http://www.aygfsteel.com/badboyryan/articles/60949.html</link><dc:creator>谈笑有�`�?/dc:creator><author>谈笑有�`�?/author><pubDate>Mon, 31 Jul 2006 02:22:00 GMT</pubDate><guid>http://www.aygfsteel.com/badboyryan/articles/60949.html</guid><wfw:comment>http://www.aygfsteel.com/badboyryan/comments/60949.html</wfw:comment><comments>http://www.aygfsteel.com/badboyryan/articles/60949.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/badboyryan/comments/commentRss/60949.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/badboyryan/services/trackbacks/60949.html</trackback:ping><description><![CDATA[
		<p>Liferay Portal�pȝ��架构�Ҏ(gu��)��<br />原文地址: <a >http://www.liferay.com/web/guest/documentation/architecture</a><br />目录<br />Liferay Portal�pȝ��架构�Ҏ(gu��)�� 1<br />目录 1<br />I、综�q�W?<br />II、Portlet 应用接口(JSP168) 2<br />III、Struts �?Tiles 2<br />IV、Session EJBs、Spring和Hibernate 3<br />V、SAOP、RMI和Tunneling 5<br />VI 应用服务器�?</p>
		<p>I、综�q?br />用户可以通过传统的或者无�U�网�l�的方式讉K��portal。开发者可以通过SOAP、RMI和自己定义的通道�c�访问暴露的API来操作portal�?br /> <br />II、Portlet 应用接口(JSP168)<br />Liferay设计成�ؓ(f��)部��v�W�合(JSP168)Portlet 应用接口的Portlet。很多有用的Portlet(比如邮�g、Liferay文档、日立、公告版和其�?已经跟portal�l�定�Q�而且可以作�ؓ(f��)��d��自定义的Portlet的范例�?br />III、Struts �?Tiles<br />所有的HTTP和W(xu��)AP��h��都通过MainServlet响应�Q�MailServlet扩展了Struts基类ActionServlet�?MainServlet处理所有的��h���Q���得每个请求都路由到合适的PortletAction�?惌���更好的理解portal的web框架请参考Struts�?br />Portal的布局信息通过定制的模板管理。想要更好的理解Tiles如何���理布局的，请参考Tile的相��x��章�?br />IV、Session EJBs、Spring和Hibernate<br />Liferay不再依赖EBJ�Q�可以部�|�在标准的servlet容器中。所有的业务逻辑都集中在可以被Spring查找和实例化的POJO实现中。这些实现都可以通过Spring的AOP和IOC修改或者强化�?br />Portal 企业版��用Session EJB包装POJO实现�Q�以为大型网站提供所需的重量��扩展和事务支持。Portal 专业版调用POJO实现以提供轻量��的一致的外观(fa?ade)�?br />所有的数据都��用Hibernate持久化，供POJO实现调用�?Liferay原来使用CMP技术构建持久化�Q?因�ؓ(f��)Hibernate优秀的速度和弹性而�{换�ؓ(f��)Hibernate�?Liferay不依赖特定的数据库，可以在多�U�流行的数据库上�q�行�?br />Liferay使用JAAS Web安全机制�Q�当用户��d��的时候，他们的信息会(x��)被传送到相应的Servlet和EJB节点。远�E�的Session EJB可以利用�q�一点，在EJB层�񔼋�认安全性和授权�Q�防止它在其他地方被复制。本地Session EJB向其他Session EJB暴露业务逻辑�Q�不需要明���的���认安全性，因�ؓ(f��)它们不会(x��)被远�E�调用。信息也�?x��)被传送到作�ؓ(f��)�q�程Session EJB基础�cȝ��POJO实现上�?br />企业版��用Session EJB�Q�允�?d��ng)R���|�者将Web服务器、EJB服务器、数据库服务器分开�Q�构��Z��层的架构。这是真正的N层部�|Ԍ��因�ؓ(f��)没有人再��x��单层的群�Q�而且可以为大企业提供最大程度的�Ҏ(gu��)���?br />大部分的EJB、HBM和Model都是�?portal-ejb目录下service。xml中的ant��d��build-service生成的。每个持久化数据的Portlet都有自己的service。xml�?搜烦(ch��)/portal-ejb目录�Q�你���可以得��C��个列�?。当我们惌���为portlet产生持久�cȝ��时候就可以复制�q�些文�g�?portal-ejb目录。这是一个构建在Xdoclet引擎上面的内部工兗��?br />比如�Q�在��d��Bookmarks Portlet的service。xml�Ӟ��下列模型�c�被生成。每个模型类映射数据库中的一个表。不要编辑B(t��i)ookmarksEntryModel�Q�要通过�~�辑B(t��i)ookmarksEntry来增加手工维护的代码。BookmarksEntry一�ơ性生成，扩展了BookmarksEntryModel。这样允许我们轻杄���生成代码�Q�而且具备手工�l�护的弹性�?br />com.liferay.portlet.bookmarks.model.BookmarksEntry<br />com.liferay.portlet.bookmarks.model.BookmarksEntryModel<br />com.liferay.portlet.bookmarks.model.BookmarksFolder<br />com.liferay.portlet.bookmarks.model.BookmarksFolderModel<br />Hibernate�cȝ��成针对各个模型类的映���。这样当模型�c�跨层配�|�而Hibernate不是的时候允�怸�个N层的架构�?br />com.liferay.portlet.bookmarks.service.persistence.BookmarksEntryHBM<br />com.liferay.portlet.bookmarks.service.persistence.BookmarksFolderHBM<br />��d��、更新、删除、查找、移动和计算Hibernate entries的持久方法作为默认的持久化机制被生成�?br />com.liferay.portlet.bookmarks.service.persistence.BookmarksEntryPersistence<br />com.liferay.portlet.bookmarks.service.persistence.BookmarksFolderPersistence<br />生成的帮助类调用持久化方法。默认的�Q�帮助类调用Hibernate持久化方法来更新数据库。你可以在portal。properties中重写，而且只要扩展了默认的持久化类���可以设�|�自��q��持久化类。这意味着可以自定义在哪里保存你的数据。它可以是一个传�l�的数据库，或者LDAP服务器，或者其他�?br />com.liferay.portlet.bookmarks.service.persistence.BookmarksEntryUtil<br />com.liferay.portlet.bookmarks.service.persistence.BookmarksFolderUtil<br />池类也被创徏成最���的对象�Q�行��Z��可以在portal。properties中修攏V�?br />com.liferay.portlet.bookmarks.service.persistence.BookmarksEntryPool<br />com.liferay.portlet.bookmarks.service.persistence.BookmarksFolderPool<br />扩展了PrincipalBean的POJO实现持有业务逻辑�Q�确认调用者信息，可以被远�E�调用。调用getUserId()�q�回当前用户id。调用getUser()�q�回代表当前用户的用��h��型。扩展POJO实现的Session EJB实现了PrincipalSessionBean�?br />比如�Q�这些类允许你删除一个书�{�օ�口或者文件夹�Q�当且仅当你是这个入口或者文件夹的创������?br />�q�些�c�d��有在它们不存在的时候才能被生成�?br />com.liferay.portlet.bookmarks.service.impl.BookmarksEntryServiceImpl<br />com.liferay.portlet.bookmarks.service.impl.BookmarksFolderServiceImpl<br />帮助�c�L����Z��POJO实现生成的。它们帮助保存开发者的旉���和显�C�错�?polluted)的代码。与其写好几行代码来��L��合适的Session EJB包装或者POJO实现�Q�你可以���单的使用BookmarksEntryServiceUril。addEntry来调用BookmarksEntryServiceImpl。addEntry中的�{��h(hu��n)�Ҏ(gu��)���?br />BookmarksEntryServiceUril 调用BookmarksFolderServiceFactory来查扑֮�现BookmarksEntryService的类。BookmarksFolderServicesFactory�Ҏ(gu��)��Spring和portal。properties的配�|�来军_��是否加蝲Session EJB包装或者POJO实现。Session EJB扩展了POJO实现�?br />com.liferay.portlet.bookmarks.service.ejb.BookmarksEntryServiceEJB<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksEntryServiceEJBImpl<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksEntryServiceHome</p>
		<p>com.liferay.portlet.bookmarks.service.spring.BookmarksEntryService<br />com.liferay.portlet.bookmarks.service.spring.BookmarksEntryServiceFactory<br />com.liferay.portlet.bookmarks.service.spring.BookmarksEntryServiceUtil</p>
		<p>com.liferay.portlet.bookmarks.service.ejb.BookmarksFolderServiceEJB<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksFolderServiceEJBImpl<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksFolderServiceHome</p>
		<p>com。Liferay.portlet.bookmarks.service.spring.BookmarksFolderService<br />com。Liferay.portlet.bookmarks.service.spring.BookmarksFolderServiceFactory<br />com。Liferay.portlet.bookmarks.service.spring.BookmarksFolderServiceUtil<br />通道(Tunneling)�c�M��得开发者可以通过80端口调用POJO实现。本文档的V部分针对�q�个�l�出了一个例子�?br />com.liferay.portlet.bookmarks.service.http.BookmarksEntryServiceHttp<br />com.liferay.portlet.bookmarks.service.http.BookmarksFolderServiceHttp<br />Soap�c�被生成�Q�以便开发者通过80端口调用POJO实现。Soap比通道(tunneling)慢，因�ؓ(f��)tunneling��h�����是二进制格式的。Soap比tunneling灉|���Q�因为客��L(f��ng)���c�M��局限于Java�?br />com.liferay.portlet.bookmarks.service.http.BookmarksEntryServiceSoap<br />com.liferay.portlet.bookmarks.service.http.BookmarksFolderServiceSoap<br />没有扩展PrincipalBean的POJO实现�cȝ��来持有业务逻辑�Q�不用确认调用者的信息�Q�可以被本地调用。这些类的存在��得业务逻辑可以很容易的被其他工�E�集成�?br />�q�些�c�d��有在先前不存在的情况下才�?x��)被生成�?br />com.liferay.portlet.bookmarks.service.impl.BookmarksEntryLocalServiceImpl<br />com.liferay.portlet.bookmarks.service.impl.BookmarksFolderLocalServiceImpl<br />帮助�c�M��一�q�生成�?br />com.liferay.portlet.bookmarks.service.ejb.BookmarksEntryLocalServiceEJB<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksEntryLocalServiceEJBImpl<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksEntryLocalServiceHome</p>
		<p>com.liferay.portlet.bookmarks.service.spring.BookmarksEntryLocalService<br />com.liferay.portlet.bookmarks.service.spring.BookmarksEntryLocalServiceFactory<br />com.liferay.portlet.bookmarks.service.spring.BookmarksEntryLocalServiceUtil</p>
		<p>com.liferay.portlet.bookmarks.service.ejb.BookmarksFolderLocalServiceEJB<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksFolderLocalServiceEJBImpl<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksFolderLocalServiceHome</p>
		<p>com.liferay.portlet.bookmarks.service.spring.BookmarksFolderLocalService<br />com.liferay.portlet.bookmarks.service.spring.BookmarksFolderLocalServiceFactory<br />com.liferay.portlet.bookmarks.service.spring.BookmarksFolderLocalServiceUtil<br />有一些用户需要远�E�调用本地的Service�c�，所以远�E�Service�cȝ��本地副本也一�q�被生成�?br />com.liferay.portlet.bookmarks.service.ejb.BookmarksEntryRemoteServiceEJB<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksEntryRemoteServiceEJBImpl<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksEntryRemoteServiceHome</p>
		<p>com.liferay.portlet.bookmarks.service.spring.BookmarksEntryRemoteService<br />com.liferay.portlet.bookmarks.service.spring.BookmarksEntryRemoteServiceFactory<br />com.liferay.portlet.bookmarks.service.spring.BookmarksEntryRemoteServiceUtil</p>
		<p>com.liferay.portlet.bookmarks.service.ejb.BookmarksFolderRemoteServiceEJB<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksFolderRemoteServiceEJBImpl<br />com.liferay.portlet.bookmarks.service.ejb.BookmarksFolderRemoteServiceHome</p>
		<p>com.liferay.portlet.bookmarks.service.spring.BookmarksFolderRemoteService<br />com.liferay.portlet.bookmarks.service.spring.BookmarksFolderRemoteServiceFactory<br />com.liferay.portlet.bookmarks.service.spring.BookmarksFolderRemoteServiceUtil<br />很多人刻意避免Session EJB因�ؓ(f��)它很重和需要大量的�~�码。我们的构徏脚本证明你可以在复用中保持Session EBJ的优势，�q�样可以在付出和回报上保持很好��^衡�?br />Spring�l�予Liferay额外的弹性�?开发者利用Liferay Portal�Q�可以在一个Servlet容器中测试他们的POJO实现;而利用Liferay Portal企业版，可以在一个应用服务器部��v成��品�?br />V、SAOP、RMI和Tunneling<br />所有的�q�程POJO实现都通过SOAP、RMI和我们自��q��通道(Tunneling)�c�L��露给外部世界�?br />我们�q�不是简单的�q�样做因为Web Service�q�是一个困��?buzz)的世界，但是我们发现它确实对集成有用。接下来是一个公司��^衡这些资源的例子�?br />3 sixteen是一家将快速创建和�q�作的T恤公司。他们看到Liferay�Q�想利用集成的购�?portlet。但是他们认为Liferay作�ؓ(f��)一个处于时���前沿的T恤公司站点太隄���了。�ؓ(f��)了解册���个问题，他们军_�����他们的�|�站分�ؓ(f��)两个站点:一个手册站点和一个购物站炏V�?br />www�?sixteen。com 成�ؓ(f��)一个构建在Flash上面的漂亮的站点。my�?sixteen。com则是使用Liferay分发的购物站炏V��这两个站点分别攑֜�不同的Linux�pȝ����L��上，所有的目的攑֜�不同的宿��M���?br />他们�q�需要构��Z��个邮件列表来攉���所有感兴趣的客��L(f��ng)��邮�g地址。�ؓ(f��)实现�q�个�Q�他们再Flash站点增加了一个JSP弹出�H�口(pop up box)�Q�这样可以告诉Portal服务器在Address Book Portlet中将邮�g地址增加到联�p�d���?contact)�?br />下面是一个JSP片断�Q�显�C?sixteen的用户如何利用ABContactServiceHttp增加一个联�p�d��表�?br /> <br />ABContactServiceHttp调用ABContactServiceUtil的addContact。这个调用通过80端口发送，�?a href="http://my/">http://my</a>�?sixteen。com/tunnel/servlet/AuthTunnelServlet接收。应用服务器���认认证匚w���Q�然后处理ABContactServiceUtil�Q�就好像ID为joe_bloggs的用户在调用addContact。然后ABContactServiceUtil调用ABContactServiceImpl来完成实际工作。你可以通过查看JavaDocs里面的源代码来查看这个逻辑�?br />现在Joe Bloggs可以��d��到portal�Q�在Address Book portlet可以看到他已�l�有一个新的联�p�d��表。所有被包含的portlet都有�q�个性能因�ؓ(f��)�q�些帮助�c�d���l�生成。这意味着你可以撰写applet或者�Q何Java应用来操作那些包含你的业务逻辑的Session EJB。假如有人持有你的密码那么这�?x��)是一个安全问题，所以你可以通过修改配置文�gportal。properties来限刉���道(Tunnel)Servlet只监听特定的端口�?br />你也可以通过SOAP和RMI操作Session EJB。我们将���快提交更多�q�方面的例子�?br />VI 应用服务�?br />Liferay是从底层构徏的，可以被应用服务器所用。下面是一个Portal例子列表�Q�显�C�portal�q�接数据库以�?qi��ng)展�C�Liferay的性能�?br /><a >http://demo.liferay.net</a><br /><a >http://my.ccuc.net</a><br /><a >http://my.3sixteen.com</a><br /><a >http://portal.liferay.com</a><br /><a >http://www.gatewayfriends.org</a><br /><a >http://www.jasonandiris.com</a><br />每个Portal中的用户在其他Portal中没有信息保留。他们用域名分隔开�Q�根据公司编号存在于各自的空间内�?br />查看Multiple Portal获取�l�节信息�Q�了解如何在一台机器上部��v多个Portal实例�?/p>
		<p>作�?: eamoi @ Aljoin Software<br />Dev2dev ID: educhina <br />Blog地址:<br /><a >http://spaces.msn.com/members/eamoi/</a><br /><a >http://blog.sina.com.cn/u/1183534285</a><br /><a href="/eamoi/">http://www.aygfsteel.com/eamoi/</a><br /></p>
<img src ="http://www.aygfsteel.com/badboyryan/aggbug/60949.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/badboyryan/" target="_blank">谈笑有�`�?/a> 2006-07-31 10:22 <a href="http://www.aygfsteel.com/badboyryan/articles/60949.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Liferay的Portlet Session处理(2) </title><link>http://www.aygfsteel.com/badboyryan/articles/60944.html</link><dc:creator>谈笑有�`�?/dc:creator><author>谈笑有�`�?/author><pubDate>Mon, 31 Jul 2006 02:09:00 GMT</pubDate><guid>http://www.aygfsteel.com/badboyryan/articles/60944.html</guid><wfw:comment>http://www.aygfsteel.com/badboyryan/comments/60944.html</wfw:comment><comments>http://www.aygfsteel.com/badboyryan/articles/60944.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/badboyryan/comments/commentRss/60944.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/badboyryan/services/trackbacks/60944.html</trackback:ping><description><![CDATA[
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														<strong>Portal开源实�?Liferay的Portlet Session处理(2)</strong>
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												<br />二、LIFERAY中的实现</p>
										<p>LIFERAY在构建ActionRequestImpl和RenderRequestImpl�Ӟ���?x��)设�|�PORTLET SESSION�Q�如下代码所�C�：(x��)<br />public RenderRequestImpl(HttpServletRequest req, Portlet portlet,<br />        CachePortlet cachePortlet,<br />        PortletContext portletCtx,<br />        WindowState windowState, PortletMode portletMode,<br />        PortletPreferences prefs, String layoutId) {<br />   ...<br />  _req = dynamicReq;<br />  _portlet = portlet;<br />  _cachePortlet = cachePortlet;<br />  _portalCtx = new PortalContextImpl();<br />  _portletCtx = portletCtx;<br />  _windowState = windowState;<br />  _portletMode = portletMode;<br />  _prefs = prefs;<br />  _ses = new PortletSessionImpl(<br />   _req.getSession(), _portletName, _portletCtx);<br />   ...<br /> }<br />从兰色的部分�Q��?_ses = new PortletSessionImpl(_req.getSession(),_portletName, _portletCtx);  �Q�我们可以看刎ͼ��q�个PORTLET SESSION其实���是PORTAL SYSTEM�?SESSION 对象�?br />所以无论request调用getSession()或者getPortletSession()都将获取Portal �pȝ��的SESSION 对象�Q�而无�����PORTLET  是或者不是属于PORTAL SYSTEM上下文。而且即��不同PORTAL APPLICATION的PORTLET也将使用同一个SESSION 对象�Q�PORTAL �pȝ���Q��?br />也就是说�Q�对于某一个PORTLET来说�Q�如果有对其的SESSION�q�行的操作，�q�没有真正的在该APPLICATION上下文中的SESSION�q�行操作�Q�而是在PORTAL�pȝ��上下文的SESSION中进行操作�?/p>
										<p>而且LIFERAY提供getPortletSession来获取PortletSession对象�Q�而不是getSession()�Ҏ(gu��)���Q�所以即使getPortletSession()可以获取正确的Session对象�Q�开发�h员由于习(f��n)惯问题，也因使用getSession()而得不到�?/p>
										<p>另外如果调用request.getSession(true)�q�可能会(x��)出现错误�Q�因为LIFERAY在包含某一个PORTLET内容是，调用PortletRequestDispatcherImpl.include()�Ҏ(gu��)���Q�该�Ҏ(gu��)�����生成PortletServletRequest 和PortletServletResponse�Q�请见如下代�?</p>
										<p>PortletServletRequest portletServletReq = new PortletServletRequest(<br />    httpReq, reqImpl, pathInfo, queryString, requestURI,<br />    servletPath);</p>
										<p>   PortletServletResponse portletServletRes =<br />    new PortletServletResponse(<br />     resImpl.getHttpServletResponse(), resImpl);<br />而PortletServletRequest的构造函数是如下定义的：(x��)<br />public PortletServletRequest(HttpServletRequest req,<br />         RenderRequest renderRequest, String pathInfo,<br />         String queryString, String requestURI,<br />         String servletPath) {</p>
										<p>  super(req);</p>
										<p>  _ses = req.getSession();<br />  _renderRequest = renderRequest;<br />  _pathInfo = pathInfo;<br />  _queryString = queryString;<br />  _requestURI = requestURI;<br />  _servletPath = servletPath;<br /> }<br />所以其SESSION依然是PORTAL�pȝ��上下文的。然后问题就出在�q�里�Q�PortletServletRequest实现了getSession()�Ҏ(gu��)���Q�但是没有实现getSession(boolen create)�Ҏ(gu��)���Q�如果用户在此阶�D�调用getSession(true)的话�Q�在某些情况下就�?x��)抛出NullPointerException</p>
										<p>原因见如下代码（��h��意我��d��的注释部分）(j��)<br />//ApplicationHttpRequest�Q� �?</p>
										<p> public HttpSession getSession(boolean create) {</p>
										<p>        if (crossContext) {<br />            <br />            // There cannot be a session if no context has been assigned yet<br />            if (context == null)<br />                return (null);</p>
										<p>            // Return the current session if it exists and is valid<br />            if (session != null)<br />                return (session.getSession());<br />     // 我的注释�Q�这里将获取PORTAL�pȝ��的SESSION对象�?br />            HttpSession other = super.getSession(false);<br />            if (create &amp;&amp; (other == null)) {<br />                // First create a session in the first context: the problem is<br />                // that the top level request is the only one which can <br />                // create the cookie safely<br />                other = super.getSession(true);<br />            }<br />            if (other != null) {<br />                Session localSession = null;<br />                try {<br />                    // 我的注释�Q�this context did not have the session with session id. It can just be found in the Portal<br />                    // context. So here it will return a null value.<br />                    localSession =<br />                        context.getManager().findSession(other.getId());<br />                    localSession.access(); //我的注释�Q�Here, localSession is null. So it throws a NullPointException.<br />                } catch (IOException e) {<br />                    // Ignore<br />                }<br />                if (localSession == null) {<br />                    localSession = context.getManager().createEmptySession();<br />                    localSession.setNew(true);<br />                    localSession.setValid(true);<br />                    localSession.setCreationTime(System.currentTimeMillis());<br />                    localSession.setMaxInactiveInterval<br />                        (context.getManager().getMaxInactiveInterval());<br /></p>
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<img src ="http://www.aygfsteel.com/badboyryan/aggbug/60944.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/badboyryan/" target="_blank">谈笑有�`�?/a> 2006-07-31 10:09 <a href="http://www.aygfsteel.com/badboyryan/articles/60944.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Portlet Session处理-转蝲</title><link>http://www.aygfsteel.com/badboyryan/articles/60943.html</link><dc:creator>谈笑有�`�?/dc:creator><author>谈笑有�`�?/author><pubDate>Mon, 31 Jul 2006 02:07:00 GMT</pubDate><guid>http://www.aygfsteel.com/badboyryan/articles/60943.html</guid><wfw:comment>http://www.aygfsteel.com/badboyryan/comments/60943.html</wfw:comment><comments>http://www.aygfsteel.com/badboyryan/articles/60943.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/badboyryan/comments/commentRss/60943.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/badboyryan/services/trackbacks/60943.html</trackback:ping><description><![CDATA[
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														<strong>Portal开源实�?Liferay的Portlet Session处理(1)</strong>
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										<p>一、规范中的SESSION描述</p>
										<p>�Q�PortletSession objects must be scoped at the portlet application context level. Each portlet application has its own distinct PortletSession object per user session. The portlet container must not share the PortletSession object or the attributes stored in it among different portlet applications or among different user sessions.�Q?br />上面�q�段话是portlet规范里的一�D�c(di��n)��很明白的可以看出，每个Portlet Application应该在Process Action和Render的时候应该拥有自��q��有的Session对象�Q�来为当前用��h��务。也���是��_(d��)��如果某一个用户在一个PORTAL�pȝ��中操作不同的PORTLET�Q�而且�q�些PORTLET属于不同的PORTLET APPLICATION�Q�则�Q�这个用户将操作多个SESSION对象�Q�用户在每个PORTLET中操作SESSION�Ӟ���q�个SESSION都将是属于该PORTLET所在的上下文的�U�有SESSION 对象。比如，用户当前��面有三个PORTLET�Q�每个PORTLET都属于不同的PORTLET APPLICATION。则当该用户在第一个PORTLET里面有对SESSION的操作后�Q�该PORTLET所属的APPLICATION����ؓ(f��)�q�个用户生成一个SESSION�Q�当该用户又操作�W�二个PORTLET中的SESSION�Ӟ��该上下文有会(x��)�Ҏ(gu��)��用户产生一个新的SESSION对象�Q�第三个依然如此。加上PORTAL�pȝ��的SESSION�Q�也���是该用户实际和四个SESSION在大交道�?/p>
										<p>另外要说明一点的是，PORTLET APPLICATION和W(xu��)EB APPLICATION的关�p�R��规范中有如下的定义�Q?br />�Q�Portlets, servlets and JSPs are bundled in an extended web application called portlet application. Portlets, servlets and JSPs within the same portlet application share class loader, application context and session. �Q?br />�q�说明PORTLET APPLICATION其实���是一个WEB APPLICATION。规范中�q�有一�D�话更是说明了这个问题，同时也强调了PORTLET SESSION 和普通的该APPLICATION的SESSION的关�p�：(x��)<br />�Q�A Portlet Application is also a Web Application. The Portlet Application may contain servlets and JSPs in addition to portlets. Portlets, servlets and JSPs may share information through their session. The PortletSession must store all attributes in the HttpSession of the portlet application. A direct consequence of this is that data stored in the HttpSession by servlets or JSPs is accessible to portlets through the PortletSession in the portlet application scope. Conversely, data stored by portlets in the PortletSession in the portlet application scope is accessible to servlets and JSPs through the HttpSession. If the HttpSession object is invalidated, the PortletSession object must also be invalidated by the portlet container. If the PortletSession object is invalidated by a portlet, the portlet container must invalidate the associated HttpSession object.�Q?/p>
										<p>最后一点要说明的是怎样得到PORTLET SESSION对象。规范中有这样一个例子：(x��)<br />PortletSession session = request.getSession(true);<br />URL url = new URL(“http://www.foo.com�?;<br />session.setAttribute(“home.url�?url,PortletSession.APPLICATION_SCOPE);<br />session.setAttribute(“bkg.color�?”RED�?PortletSession.PORTLET_SCOPE);</p>
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<img src ="http://www.aygfsteel.com/badboyryan/aggbug/60943.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/badboyryan/" target="_blank">谈笑有�`�?/a> 2006-07-31 10:07 <a href="http://www.aygfsteel.com/badboyryan/articles/60943.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss>                                                                                                       <footer>
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