Liferay Portal is an open source portal that helps organizations collaborate more efficiently by providing a consolidated view of disparate applications. It is used by large and small organizations all over the world. Liferay has an extensive list of features that compares with most commercial portals, but without the high license fees. A live demo is available at http://demo.liferay.net.
Liferay門戶是一個開源的門戶框架軟件，它能完美地統(tǒng)一不同應(yīng)用從而使企業(yè)或組織合作更有效整合。在世界范圍內(nèi)，它被大大小小的各企業(yè)所應(yīng)用。Liferay具有很多優(yōu)良的特性完全可以與商業(yè)軟件媲美，而卻不需要昂貴的軟件費用。有一個在線的演示版本可以通過http://demo.liferay.net訪問到。
Open Source License
開源的許可證
Liferay is made available under the MIT license, which is essentially the same as the Apache and BSD licenses. The MIT license is business friendly and contains no license fees or reciprocity clauses. You can bundle Liferay or your branch of Liferay and even resell it if you want. We do recommend that companies contribute their bug fixes and modifications back to Liferay so the community at large can benefit. It also allows your organization to easily upgrade to the latest version of Liferay.
Liferay的許可符合MIT license，這個協(xié)議類似于Apache和BSD的許可協(xié)議。這是一個商業(yè)友好的協(xié)議，不包含任何許可證費用或者合作條款。你完全可以打包發(fā)行Liferay或者自己的分支版本，只要你愿意。我們也建議使用者貢獻(xiàn)反饋Bug或修正的內(nèi)容給本研究團(tuán)體。在版本升級方面Liferay也為使用者提供最大的便利。
Features主要特點
- JSR 168 (Portlet API) Compliant
兼容JSR 168 (Portlet API)
You can hot deploy any JSR 168 compliant portlet. This means you can provide more functionality to your end users by writing custom portlets. Or, you can deploy portlets that you buy from a portlet vendor.
你可以在線裝載任何JSR 168兼容的門戶單元。這對于自己定義門戶單元的使用者提供了極大的方便性，當(dāng)然也可以直接從門戶單元開發(fā)商處采購不裝載。 - WSRP Compliant
兼容WSRP
WSRP is a web services standard that allows you to publish portlets from your portal to external portals and allows you to consume portlets in your portal from external portals. This allows you to buy and sell portlet functionality as a service.
WSRP是一個有關(guān)門戶單元外裝載的WEB服務(wù)標(biāo)準(zhǔn)，它允許發(fā)直接在外部門戶上發(fā)布門戶單元或引用外部門戶的門戶單元。這一點使得門戶功能服務(wù)的商業(yè)化成為可能。 - CMS
內(nèi)容管理系統(tǒng)
Liferay provides content management system functionality via a set of portlets that give your organization a flexible templating tool built on top of XSLT technologies. This allows you to build your site while cleanly separating content from the look and feel of a site. This page is served by the CMS tool. We will be JSR 170 (CMS API) compliant after the specification is finalized.
Liferay提供內(nèi)容管理系統(tǒng)的功能，它使用了一整套門戶單元，給使用的組織提供一個靈活的基于XSLT技術(shù)的模板工具。這樣的功能使你的站點完美分離了內(nèi)容與視覺兩層次。開發(fā)的下一目標(biāo)是還要完全兼容JSR 170 (CMS API)標(biāo)準(zhǔn)。 - Themes
主題
Liferay provides a hot deployable theme architecture that allows you to change the look and feel of the portal without modifying Liferay‘s core code. Graphic designers can easily mock up new themes because all of our pages utilize DIVs and CSS standards.
Liferay提供在線裝載主題的機(jī)制，從而可以在不修改核心代碼的情況下自由改變門戶系統(tǒng)的外觀面貌。熟悉圖形設(shè)計話，可以輕松利用DIV及CSS等標(biāo)準(zhǔn)改寫新的主題。 - SSO
單一登錄
Liferay provides a built in connector for CAS, Yale‘s single sign on engine. You can write custom hooks to integrate with other SSO engines like Netegrity.
Liferay內(nèi)置了Yale大學(xué)提供的一個統(tǒng)一認(rèn)證服務(wù)CAS的連接器。但用戶也完全可以利用客戶化接口來集成其它單一認(rèn)證，如：Netegrity
Liferay can also synchronize its user list between the portal and an external data source like another database or LDAP server. A default connector for Microsoft Exchange is bundled with the portal.
Liferay還可以同步本系統(tǒng)和外部系統(tǒng)（如：LDAP）的用戶清單，發(fā)行版本中默認(rèn)內(nèi)置的是Microsoft Exchange。 - ASP Model
多應(yīng)用服務(wù)提供者模型
Liferay was designed from the ground up to be used by application service providers. This means you can host multiple instances of the portal (distinguished by unique URLs) on one application server and database.
Liferay的設(shè)計完全符合多應(yīng)用服務(wù)使用者的需求，也就是說，可能通過URL區(qū)別把不同的多個門戶站點安裝在一個應(yīng)用服務(wù)器及數(shù)據(jù)庫上。 - Application Server Agnostic
應(yīng)用服務(wù)器無關(guān)性/兼容性
Unlike portals that come from application server vendors, Liferay is designed to be application server agnostic so you are not locked into a specific server. Liferay will work on lightweight servlet containers like Jetty and Tomcat, or on J2EE compliant servers like Borland ES, JBoss+Jetty/Tomcat, JOnAS+Jetty/Tomcat, JRun, Oracle9iAS, Orion, Pramati, RexIP, Sun JSAS, WebLogic, and WebSphere.
完全不同于應(yīng)用服務(wù)器提供商的門戶產(chǎn)品，Liferay并不專門綁定某特定應(yīng)用服務(wù)器。它既可以在輕量級的servlet容器（如Jetty、Tomcat）上運(yùn)行，也適用于J2EE兼容的服務(wù)器，如：Borland ES、JBoss+Jetty/Tomcat、JOnAS+Jetty/Tomcat、JRun、Oracle9iAS、Orion、Pramati、RexIP、Sun JSAS、WebLogic或者WebSphere。
An added bonus of being a Java portal means Liferay will work on many operating systems: BSD (FreeBSD, NetBSD, OpenBSD), Linux (Fedora, Novell), Solaris, Mac OS X, and Windows.
作為JAVA門戶的另外一個好處是，Liferay可以運(yùn)行在絕大多數(shù)的操作系統(tǒng)上：BSD (FreeBSD, NetBSD, OpenBSD), Linux (Fedora, Novell), Solaris, Mac OS X, 和 Windows. - Spring, EJB, and AOP
Spring, EJB, 和AOP
Liferay‘s business beans are built on top of Spring. This allows you to leverage Spring‘s AOP, IOC, and proxy features to customize Liferay.
Liferay使用Spring技術(shù)實現(xiàn)業(yè)務(wù)bean，這樣可以很好的利用Spring的AOP、IOC、代理等特色功能。
We use Spring to decide whether to call the POJO implementation of a business bean or the EJB wrapped implementation of a business bean. This allows deployers to decide whether to deploy Liferay on a heavyweight application server like Borland ES (and thus leverage VisiBroker‘s transaction features) or a lightweight container like Tomcat.
Liferay借用Spring決定是調(diào)用POJO的業(yè)務(wù)實現(xiàn)還是EJB業(yè)務(wù)實現(xiàn)，這樣系統(tǒng)布署時可以靈活選擇Tomcat之類的輕量級的應(yīng)用服務(wù)器，或者是類似Borland ES的重量級服務(wù)器 - Database Agnostic
數(shù)據(jù)庫無關(guān)性/兼容性
Liferay uses Hibernate as the ORM tool for the persistence layer which enables pluggable databases (DB2, Firebird, Hypersonic, InterBase, JDataStore, MySQL, Oracle, PostgreSQL, SAP, SQL Server). This allows your organization to leverage existing resources without having to purchase new database hardware and software.
Liferay使用Hibernate作為ORM工具實現(xiàn)持久層，可以兼容各類數(shù)據(jù)庫（DB2, Firebird, Hypersonic, InterBase, JDataStore, MySQL, Oracle, PostgreSQL, SAP, SQL Server）。這一功能使得企業(yè)不必專門購買新的數(shù)據(jù)庫來適應(yīng)系統(tǒng)。 - Scalable N-Tier Cluster
可擴(kuò)展N層集群技術(shù)
Liferay is very scalable and uses OSCache to provide deployers with a clustered cache. You can scale by adding more nodes without sacrificing on caching.
Liferay具有良好的可擴(kuò)展性，它用使用的緩沖技術(shù)OSCache支持集群技術(shù)，所以可以通過增加節(jié)點來擴(kuò)展，而不損失緩沖的優(yōu)點。
You can cluster the enterprise release of Liferay in multiple tiers: presentation tier, business logic tier, and database tier to meet your specific load requirements.
對于企業(yè)版本的Liferay，用戶可以根據(jù)負(fù)載需要在多個層次采用集群技術(shù)，包括：表現(xiàn)層，業(yè)務(wù)邏輯層，數(shù)據(jù)庫層。 - Struts and Tiles
Struts和Tiles
Liferay leverages off of Struts to follow the MVC pattern. Most programmers are already familiar with Struts, which means your developers will have an easier time of writing portlets in a familiar framework.
Liferay使用Struts的技術(shù)來實現(xiàn)MVC模式。大多數(shù)的開發(fā)者熟悉Struts，所以他們在開發(fā)時就更容易上手。
The look and feel of the portal can be easily customized and reskinned because the display logic is concentrated in a few template files read by Tiles.
表現(xiàn)邏輯集中在幾個Tiles模板上，所以表現(xiàn)層也容易可以實現(xiàn)客戶化或采用新的“皮膚”。 - Internationalization
國際化
Liferay can display and receive input in multiple languages. Language resources for Chinese, Dutch, English, French, German, Greek, Italian, Japanese, Korean, Portuguese, Spanish, Turkish, and Vietnamese are already included.
Liferay可以顯示并接收各種語言，已經(jīng)包括的語言包有：中文、荷蘭、英語、法文、德語、意大利、日語、韓語、葡萄牙、西班牙、土耳其語以及越南等語種。 - Personalization
個性化
Portlets can be rearranged to the unique preferences of a user or community. Move things up, down, and all around.
門戶單元可以針對用戶或群組作個性化的單獨設(shè)置，包括移上、移下、增加減少等各類操作。 - Administration
管理體制
Liferay allows administrators to easily manage users, groups, and roles through a GUI interface. Groups signify a collection of users. Roles signify permissions that a group or user can be bound to. Access to portlets are also restricted to users based on roles.
Liferay為管理員提供了良好的圖形界面，可以用來管理用戶、群組、角色等。群組就是一組用戶的集合，角色表示一組可以分配給用戶或群組的權(quán)限，訪問門戶單元的權(quán)限機(jī)制就是通過基于用戶之上的角色授權(quán)來實現(xiàn)的。
Administrators can also specify community pages so that all users who belong to a certain group see the same page.
管理員也可以指定單獨的團(tuán)體共享頁面，這樣屬于該組的所有用戶都可以訪問到這一統(tǒng)一的頁面。 - Out of the Box Portlets
附送的大量門戶單元
Liferay provides many useful portlets: Blogs, Calendar, Document Library, Journal (CMS), Image Gallery, Mail, Message Boards, Polls, RSS, and Wiki.
Liferay隨包附送了大量的優(yōu)秀門戶單元：博客Blogs、日歷、文檔庫、期刊（CMS）、圖片畫廊、郵件系統(tǒng)、公告板、投票、RSS以及Wiki。
Portals are only useful so long as there are portlets that provide functionality. Our bundled portlets are a great starting point for a portal deployment. They also serve as a large code base of examples from which you can glean patterns on how to write portlets.
門戶只能通過不同的門戶單元才能提供服務(wù)功能。附送的門戶單元既可以作為使用者開發(fā)的一個基礎(chǔ)起點，也是一個大規(guī)模關(guān)于門戶單元編程實現(xiàn)的示例代碼庫。 - Community Based Portlets
團(tuán)隊共享的門戶單元
Many of the bundled portlets are community aware. For example, if you add an event to your HR community calendar, then Marketing would not be aware of it.
許多的門戶單元是基于團(tuán)隊組織的系統(tǒng)，比如：當(dāng)你在HR團(tuán)隊日歷中增加一個事件后，市場部也可以查到。
Liferay vs. Closed Source Portals
Liferay與非開源門戶比較
Liferay provides the lowest total cost of ownership. There are ZERO license fees. Don‘t pay more because you add more users or need to scale with more CPUs and servers.
Lifera提供最小的整體擁有成本。既沒有許可證的費用，也不必因為要增加用戶或擴(kuò)充CPU或服務(wù)器而支付額外的費用。
Liferay has no application server agenda. Don‘t use a portal simply because it was made by the same vendor that made your application server so they can sell you more licenses. Mix and match so you get the best of breed.
Liferay不會與任何應(yīng)用服務(wù)器綁定。不要以為購買應(yīng)用服務(wù)器也同時購買門戶軟件就可以得到更多的折扣，事實上這正是那么些商家要拴住客戶的重要手段，而收費的項目在可能正在后續(xù)中。
You can develop portlets with a full featured IDE like Eclipse, Netbeans, and JBuilder or with lightweight editor like EditPlus, VI, and Emacs. Commercial portals love to sell tools that promise to save you time and money but almost always end up wasting you time and money. This isn‘t 1999. Save money.
用戶在開發(fā)門戶單元時使用的工具軟件，既可以是全能的IDE如：Eclipse, Netbeans, 及JBuilder，也可以是輕量級的EditPlus, VI, 和Emacs等。商業(yè)門戶軟件喜歡同時賣開發(fā)工具給用戶，并許諾可以節(jié)約時間和金錢，而事實上卻正是浪費，現(xiàn)在畢竟不是在1999那樣的年代了，節(jié)約點錢吧。
Open source means the code is in your hands. If you want to customize it, you can. If there are security flaws, everyone is made aware and the community can partipate in fixing it quickly. There is actually the less risk in going with a sustained open source product than in going with a commercial vendor. Vendors can go out of business. Vendors can merge and render your product dead in the water. Sustained open source products have an active community around it that works together.
開源意味著代碼在自己的手中，如果想改就可以改，如果有安全的漏洞，大家都會知道，組織者會參與著手來修正它。事實上，采用一個持久的開源產(chǎn)品比商業(yè)的可能更安全，因為商業(yè)的開發(fā)商可能在行業(yè)內(nèi)出局或者故意在你使用產(chǎn)品中使壞，而開源項目中總有一個活動的團(tuán)隊在努力為它工作。
Liferay vs. Open Source Portals
Liferay對比其它開源的商業(yè)門戶軟件
Not all open source licenses are created equal. Some licenses require that your modifications be contributed if you choose to sell or distribute your product. Some open source vendors still charge a license fee for commercial use. Others are confused and flip flop from being closed source one minute and open source the next minute. Liferay is open source because we believe it is the next step in the evolution of software development.
即使同樣是開源，開放的程度方式也各不相同。有的許可要求修改再發(fā)行時要把所作的修改貢獻(xiàn)回原組織；更多的是開源并不對商業(yè)使用免費；還有一些是時開時不開或者開源時有時間的滯后。Liferay之所以開源是因為相信軟件開發(fā)的下一個演變主題就是開源。
Liferay has a very active community as evidenced by our active forums. If you‘re a small organization that doesn‘t require mission critical response times, you‘ll get the help you need. If your organization requires mission critical support so your project deadline is not compromised, then you can get direct access to the developers of Liferay through professional support and consulting.
Liferay活躍的論壇forums可以說明有一個很好的團(tuán)隊在背后作支持。如果你是小的應(yīng)用實時性要求也不高，論壇完全可以滿足需要；而如果你的項目對實時性要求很高，那么你要求助于專業(yè)的技術(shù)支持及咨詢。
Using Liferay means you get a good portal with no license fees. But if you need help, you‘re not at the mercy of volunteers but can get professional support. We don‘t claim to be the best portal that can meet everyone‘s needs, but we just may be the best portal to meet your needs. Feel free to contact us at staff@liferay.com.
選擇Liferay就意味著您擁有了一個免費的優(yōu)秀門戶軟件。而且支持也不僅是一些志愿者的幫助，還可以得到專業(yè)的技術(shù)服務(wù)。我們不敢講最地的門戶能滿足所有人的需求，但它可能是滿足您的需求的最好的門戶軟件。歡迎聯(lián)系我們：staff@liferay.com。
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