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Joomla 框架
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       框架(Framework)是整个或部分系统的可重要设计.表现为一组抽象类(abstract classes)和程序实例间交互的方法.一个程序框架包括了支持程序组,代码库和脚 本语言或者其他程序帮助开发及整合该项目程序的不同组件.框架的不同部分可以通过应用程序接口(API)陈列出来.

   

joomla1.5有三层系统:
   顶层:扩展层,由模块,组件,模板组成:
       1. 模块:轻量级和非常灵活的用来填充页面.有些模块是链接组件如最新文章模块就是用来链接文章组件(com_content) ,它显示的是文章组件最新文章的标题链接,这些模块通常是像"盒子一样围绕在组件页面的周围.模块可以分配给单个的菜单项目,也就是一个模块可以选择在某个菜单项目下可见,在某个菜单项目不可见,便如如果你决定登录模块只在首页下可见,你只需要将该模块分配给首页,那只你有点击首页到首页后才可以看到登录模块,当然,模块也不可以链接组件,可以显示某篇文章,也可以显示登陆界面.模块设置,在后台的模块管理里面进行设置.
        2.组件:可以理解为joomla功能的补充,便如安装joomla时,joomla自身就带有了文章组件,菜单组件,联系组件,等等.每个组件就实现一个功能,如果你想要joomla做的网站有留言板的功能,就必须再安装一个留言板的组件.模块便是组件的一个补充.
        3.模板:决定网站外观的一个扩展
 中间层:应用层,是框架JApplication 类的延伸,由四部分组成:

• JInstallation 负责joomla在服务器上的安装,当安装完成后会被删除
• JAdministrator 负责后台管理.
• JSite 负责网站的前台.
• XML-RPC 支持joomla网站的远程管理

底层,由三部分组件:
 1. Joomla 框架本身,下面的显示的类.
 2.库,满足框架的需求和第三方开发者安装使用
3.插件:在框架里扩展有用的功能.
                                       

• JFactory
• JRoute
• JText
• JVersion

Access

• JAccess (from 1.6)
• JAccessHelper (from 1.6)
• JAccessLevel (from 1.6)
• JSimpleRule (from 1.6)

Application

• JApplication
• JApplicationHelper
• JCategoryTree (from 1.6)
• JCategoryNode (from 1.6)
• JComponentHelper
• JController
• JMenu
• JModel
• JModelItem (from 1.6)
• JModelList (from 1.6)
• JModuleHelper
• JPathway
• JRouter
• JView

Backup

• JBackup (from 1.6)
• JBackupFilesystem (from 1.6)
• JBackupSql (from 1.6)
• JBackupTable (from 1.6)

Base

• JAdapter (from 1.6)
• JAdapterInstance (from 1.6)
• JClass (from 1.6)
• JObject
• JObservable
• JObserver
• JTree
• JNode

Cache

• JCache
• JCacheCallback
• JCacheOutput
• JCachePage
• JCacheStorage
• JCacheStorageApc
• JCacheStorageEaccelerator
• JCacheStorageFile
• JCacheStorageMemcache
• JCacheStorageXCache
• JCacheView

Client

• JClientHelper
• JFTP
• JLDAP

Database

• JDatabase
• JDatabaseMySQL
• JDatabaseMySQLi
• JDataLoad (from 1.6)
• JDataLoaderSQL (from 1.6)
• JQuery (from 1.6)
• JQueryElement (from 1.6)
• JRecordSet
• JTable
• JTableARO
• JTableAROGroup
• JTableAsset (from 1.6)
• JTableBackup (from 1.6)
• JTableBackupEntry (from 1.6)
• JTableCategory
• JTableComponent
• JTableContent
• JTableExtension (from 1.6)
• JTableMenu
• JTableMenuTypes
• JTableModule
• JTablePlugin
• JTableSection
• JTableSession
• JTableTree (from 1.6)
• JTableUpdate (from 1.6)
• JTableUser
• JTableUsergroup (from 1.6)

Document

• JDocument
• JDocumentError
• JDocumentFeed
• JDocumentHTML
• JDocumentPDF
• JDocumentRaw
• JDocumentRenderer
• JDocumentRendererAtom
• JDocumentRendererComponent
• JDocumentRendererHead
• JDocumentRendererInstallation (from 1.6)
• JDocumentRendererMessage
• JDocumentRendererModule
• JDocumentRendererModules
• JDocumentRendererRSS
• JDocumentVCARD (from 1.6)
• JDocumentXML (from 1.6)
• JFeedEnclosure (from 1.6)
• JFeedImage (from 1.6)
• JFeedItem (from 1.6)

Environment

• JBrowser
• JRequest
• JResponse
• JURI

Error

• JError
• JException
• JLog
• JProfiler

Event

• JDispatcher
• JEvent

Filesystem

• JArchive
• JArchiveBzip2
• JArchiveGzip
• JArchiveTar
• JArchiveZip
• JFile
• JFilesystem (from 1.6)
• JFilesystemFTP (from 1.6)
• JFilesystemHelper (from 1.6)
• JFilesystemSSH (from 1.6)
• JFilesystemPHP (from 1.6)
• JFolder
• JPath
• JStream (from 1.6)
• JStreamString (from 1.6)
• JStringController (from 1.6)

Filter

• JFilterInput
• JFilterOutput

Form

• JForm (from 1.6)
• JFormField (from 1.6)
• JFormFieldAccessLevels (from 1.6)
• JFormFieldAccessSections (from 1.6)
• JFormFieldCalendar (from 1.6)
• JFormFieldCategories (from 1.6)
• JFormFieldCheckbox (from 1.6)
• JFormFieldCombo (from 1.6)
• JFormFieldEditor (from 1.6)
• JFormFieldEditors (from 1.6)
• JFormFieldFile (from 1.6)
• JFormFieldHelpsites (from 1.6)
• JFormFieldHidden (from 1.6)
• JFormFieldIntegers (from 1.6)
• JFormFieldLanguages (from 1.6)
• JFormFieldList (from 1.6)
• JFormFieldMedia (from 1.6)
• JFormFieldPassword (from 1.6)
• JFormFieldRadio (from 1.6)
• JFormFieldSpacer (from 1.6)
• JFormFieldText (from 1.6)
• JFormFieldTextarea (from 1.6)
• JFormFieldTimezones (from 1.6)
• JFormFieldUserGroups (from 1.6)
• JFormRule (from 1.6)
• JFormRuleBoolean (from 1.6)
• JFormRuleEquals (from 1.6)
• JFormRuleEmail (from 1.6)
• JFormRuleUsername (from 1.6)
• JFormValidator (from 1.6)

HTML

• JButton
• JButtonConfirm
• JButtonCustom
• JButtonHelp
• JButtonLink
• JButtonPopup
• JButtonSeparator
• JButtonStandard
• JEditor
• JElement
• JElementCalendar
• JElementCategory
• JElementEditors
• JElementFileList
• JElementFolderList
• JElementHelpsites
• JElementHidden
• JElementImageList
• JElementLanguages
• JElementList
• JElementList_AssetGroups (from 1.6)
• JElementMenu
• JElementMenuItem
• JElementPassword
• JElementRadio
• JElementSection
• JElementSpacer
• JElementSQL
• JElementText
• JElementTextarea
• JElementTimezones
• JElementUserGroup
• JHtml
• JHtmlAccess (from 1.6)
• JHtmlAcl (from 1.6)
• JHtmlBehavior
• JHtmlContent
• JHtmlEmail
• JHtmlForm
• JHtmlGrid
• JHtmlImage
• JHtmlList
• JHtmlMenu
• JHtmlSelect
• JContent (from 1.6)
• JPagination
• JPaginationObject (from 1.6)
• JPane
• JPaneTabs (from 1.6)
• JPaneSliders (from 1.6)
• JParameter
• JToolBar

Installer

• JDependency (from 1.6)
• JExtension (from 1.6)
• JInstaller
• JInstallerComponent
• JInstallerFiles (from 1.6)
• JInstallerHelper
• JInstallerLanguage
• JInstallerLibrary (from 1.6)
• JInstallerModule
• JInstallerPackage (from 1.6)
• JInstallerPlugin
• JInstallerSQL (from 1.6)
• JInstallerTemplate
• JLibraryManifest (from 1.6)
• JPackageManifest (from 1.6)

Language

• JHelp
• JLanguageHelper
• JLanguage

Mail

• JMailHelper
• JMail

Plugin

• JPluginHelper
• JPlugin

Registry

• JRegistry
• JRegistryFormat
• JRegistryFormatINI
• JRegistryFormatPHP
• JRegistryFormatXML
• JRegistryFormatJSON (from 1.6)

Session

• JSession
• JSessionStorage
• JSessionStorageApc
• JSessionStorageDatabase
• JSessionStorageEaccelerator
• JSessionStorageMemcache
• JSessionStorageNone
• JSessionStorageXcache

Task

• JTask (from 1.6)
• JTaskSet (from 1.6)

Template

This package is deprecated from 1.5 onwards. Template extensions are part of the Document package now.

• JTemplate
• patTemplate_Function_Sef
• patTemplate_Function_Translate
• patTemplate_Modifier_SEF
• patTemplate_Modifer_Translate

Updater

• JUpdate (from 1.6)
• JUpdateAdapter (from 1.6)
• JUpdater (from 1.6)
• JUpdaterCollection (from 1.6)
• JUpdaterExtension (from 1.6)

User

• JAuthentication
• JAuthenticationResponse (from 1.6)
• JAuthorization
• JUserHelper
• JUser

Utilities

• JArrayHelper
• JBuffer
• JDate
• JSimpleCrypt
• JSimpleTemplate (from 1.6)
• JSimpleXML
• JSimpleXMLElement
• JString
• JUtility