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外文原文JSPAPACKAGINGJSPPAGESTHISAPPENDIXSHOWSTWOSIMPLEEXAMPLESOFPACKAGINGAJSPPAGEINTOAWARFRODELIVERINTOAWEBCONTAINERINTHEFIRSTEXAMPLE,THEJSPPAGEISDELIVERDINSOURCEFORMTHISISLIKELYTOBETHEMOSTCOMMONEXAMPLEINTHESECONDEXAMPLETHEJSPPAGEISCOMPLIEDINTOASERVLETTHATUSESONLYSERVLET24ANDJSP20APICALLTHESERVLETISTHENPACKAGEDINTOAWARWITHADEPLOYMENTDESCRIPTORSUCHTHATITLOOKSASTHEORIGINALJSPPAGETOANYCLIENTTHISAPPENDIXISNONNORMATIVEACTUALLY,STRICTLYSPEAKING,THEAPPENDIXRELATESMORETOTHESERVLET24CAPABILITIESTHANTOTHEJSP20CAPABILITIESTHEAPPENDIXISINCLUDEDHEREASTHISISAFEATURETHATJSPPAGEAUTHORSANDJSPPAGEAUTHORINGTOOLSAREINTERESTEDINJSPA1AVERYSIMPLEJSPPAGEWESTARTWITHAVERYSIMPLEJSPPAGEHELLOWORLDJSPJSPA2THEJSPPAGEPACKAGEDASSOURCEINAWARFILETHEJSPPAGECANBEPACKAGEDINTOAWARFILEBYJUSTPLACINGITATLOCATION/HELLOWORLDJSPTHEDEFAULTJSPPATEEXTENSIONGMAPPINGWILLPICKITUPTHEWEBXMLISTRIVIALJAVASERVERPAGES20SPECIFICATIONJSPA3THESERVLETFORTHECOMPILEDJSPPAGEASANALTERNATIVE,WEWILLSHOWHOWONECANCOMPILETHEJSPPAGEINTOASERVLETCLASSTORUNINAJSPCONTAINERTHEJSPPAGEISCOMPILEDINTOASERVLETWITHSOMEIMPLEMENTATIONDEPENDENTNAMECOMACME_JSP_HELLOWORLD_IMPLTHESERVLETCODEONLYDEPENDSONTHEJSP20ANDSERVLET24APISASFOLLOWSJSPBJSPELEMENTSOFWEBXMLTHISAPPENDIXDESCRIBESTHEJSPELEMENTSOFTHESERVLET24WEBAPPLICATIONDEPLOYMENTDESCRIPTOR,WHICHISDESCRIBEDUSINGXMLSCHEMATHESERVLET24DEPLOYMENTDESCRIPTORSCHEMAINCLUDESTHEDEFINITIONSTHATAPPEARINTHISAPPENDIXTHISISTHESAMEXMLSCHEMAASHTTP/JAVASUNCOM/XML/NS/JE2EE/JSP_2_0XSD,EXCEPTFORSOMEFORMATTINGCHANGESTOEXTRACTCOMMENTSANDMAKETHEMMOREREADABLEJSPCTAGLIBRARYDESCRIPTIORFORMATSTISAPPENDIXINCLUDESTHEXMLSCHEMAANDDTDFILESFORTAGLIBRARYDESCRIPTIORSUSINGEACHVERSIONGOFTHEJSPSPECIFICATIONALLJSP20CONTAINERSAREREQUIRESTOBEPARSEANDACCEPTALLTLDFORMATSDESCRIBEDINTHISAPPENDIXTHEFORMATSARELISTEDINORDERFROMMOSTRECENTTOLEASTRECENTJSPC1XMLSCHEMAFORTLD,JSP20THEFOLLOWINGISANXMLSCHEMAFILEDESCRIINGATAGLIBRARYDESCRIPTORINAJSP20FORMATTHISISTHESAMEXSDASHTTP/JAVASUNCOM/XML/NS/J2EE/WEBJSPTAGLIBRARY_2_0XSD,EXCEPTFORSOMEFORMATTINGCHANGESTOEXTRACTCOMMENTSANDMAKETHEMMOREREADABLE,SOMEOFTHETYPESUSEDINTHISXSDAREDEFINEDINTHEJ2EEPLATFORMSPECIFICATIONTHESCHEMAISPREEDEDBYASETOFDIAGRAMSTHATGRAPHICALLYILLUSTRATETHEELEMENTSTRUCTUREOFTHESCHEMATHESYMBOLSHAVETHESAMEMEANINGASINDTDINTHEEVENTOFADISCREPANCYBETWEENTHESEDIAGRAMSANDTHESCHEMA,THESCHEMAPREVAILSJAVASERVERPAGES20SPECFICATIONJSPC2DTDFORTLD,JSP12THEFOLLOWINGISADTDDESCRIBINGATAGLIBRARYDESCRIPTORFILEINJSP12FORMATTHISISTHESAMEDTDAS“HTTP/JAVASUNCOM/DTD/WEBJSPTAGLIBRARY_1_2DTD”,EXCEPTFORSOMEFORMATTINGCHANGESTOEXTRACTCOMMENTSANDMAKETHEMMOREREADABLETHISISTHEDTDDEFININGTHEJAVASERVERPAGES12TAGLIBRARYDESCRIPTORATAGLIBRARYISAJARFILECONTAININGAVALIDINSTANCEOFATAGLIBRARYDESCRIPTORQUIREDTOIMPLEMENTTHEACTIONSDEFINEDTHEREINWHENDEPLOYEDINSIDAJARFILE,THETAGLIBRARYDESCRIPTORFILESMUSTBEINTHEMETAINFDIRECTORY,ORASUBDIRECTORYOFITWHENDEPLOYEDDIRECTLYINTOAWEBAPPLICATION,THETAGLIBRARYDESCRIPTORFILESMUSTALWAYSBEINTHEWEBINFDERECTORY,ORSOMESUBDIRECTORYOFITPACKAGEDTAGLIBRARIESMUSTHAVEATLEASTONETAGLIBRARYDESCRIPTORFILETHEJSP12SPECIFICATIONALLOWEDFORONLYASINGLETLD,INMETAINF/TAGLIBTLD,BUTINJSP12MUTIPLETAGLIBRARIESAREALLOWEDUSEISSUBJECTTOLICENSETERMSJSPDPAGEENCODINGDETECTIONTHISAPPENDIXDETAILSTHEALGORITHMCONTAINERSAREREQUIREDTOUSEINORDERTODETERMINETHECHARACTERENCODINGFORAJSPFILESEECHAPTERJSP4,”INTERNATIONALIZATIONISSUES”FORDETAILSONWHERETHISALGORITHMISUSEDTHEALGORITHMISDESIGNEDTOMAXIMIZECONVENIENCETOTHEPAGEAUTHOR,WHILEPRESERVINGBACKWARDSCOMPATIBILITYWITHPREVIOUSVERIONSOFTHEJSPSPECIFICATIONJSPD1DETECTIONALGORITHMTHEFOLLOWINGISACOMPLETETHOUGHUNOPTIMIZEDALGORITHMFORDETERMINGINGTHECHARACTERENCODINGFORAJSPFILEJSPCONTAINERSMAYUSEANOPTIMIZEDVERSIONGOFTHISALGORITHM,BUTITMUSTDETECTTHESAMEENCODINGASTHEALGORITHMINALLCASES1DCIDEWHETHERTHESOURCEFILEISAJSPPAGEINSTANDARDSYNTAXORAJSPFILE,THENIFITHASTHEVALUE“TRUE”,THEFILEISAJSPDOCUMENT,ANDIFITHASTHEVALUE“FALSE,THEFILEISNOTAJSPDOCUMENT2OTHERWISE,IFTHEFILENAMEHASTHEEXTENSIONG“JSPX”,THEFILEJSPISAJJSPDOCUMENTIDTERMINETHEINITIALENCODINGFROMTHEFIRSTFOURBYTESOFTHEFILE,ASDESCRIBEDINAPPENDIXF1OFTHEXML10SPECIFICATIONFORTHEBYTESEQUENCE“3C3F786D”,USEISO88591FORTHEBYTESEQUENCE“4C6FA794”,USEIBM037FORALLOTHECASES,USETHEUTFENCODINGGIVENINTHEAPPENDIXIIREADTHEFILEUSINGTHEINITIALENCODINGANDSEARCHFORAELEMENTIFTHEELEMENTISFOUNDANDISTHETOPELEMENT,THEFILEISAJSPDOCUMENTINXMLSYNTAXDOTHERWISE,THEFILEISAJSPPAGEINSTANDARDSYNTAX3IFTHEFILEISAJSPPAGEINSTANDARDSYNTAX,USETHESESTEPSACHECKWHETHERTHEREISAJSPCONFIGURATIONELEMENTWHOSEURLPATTERNMATCHESTHISFILEBREADTHEFILEUSINGTHEINITIALENCODINGANDSEARCHFORAPAGEENCODINGATTRIBUTEINAPAGEDECLARATIONTHESPECIFICATIONREQUIRESTHEATTRIBUTETOBEFOUNDONLYIFITISNOTPRECEDEDBYNONASCIICHARACTERS,SOSIMPLIFIEDIMPLENTATIONSAREALLOWEDCREPORTANERRORIFTHEREAREACONFIGURATIONELEMENTWHOSEURLPATTERNMATCHESTHISFILEANDAPAGEENCODINGATTRIBUTE,ANDTHETWONAMEDIFFERENTENCODINGSDIFTHEREISACONFIGURATIONELEMENTWHOSEURLPATTERNMATCHESTHISFILE,THEPAGECHARACTERENCODINGISTHEONENAMEDINTHISELEMENTEOTHERWISE,IFTHEREISAPAGEENCODINGATTRIBUTE,THEPAGECHARACTERENCODINGISTHEONENAMEDINTHISATTRIBUTEGOTHERWISE,IFTHEREISAPAGEENCODINGATTRIBUTE,THEPAGECHARACTERENCODINGISTHEONENAMEDINTHISATTRIBUTEFOTHERWISE,READTHEFILEUSINGTHEINITIALENCODINGANDSEARCHFORACHARSETVALUEWITHINACONTENTTYPEATTRIBUTEINAPAGEDECLARATIONIFITEXISTS,THEPAGECHARACTERENCODINGISTHEONENAMEDINTHISCHARSETVALUETHESPECIFICATIONREQUIRESTHEATTRIBUTETOBEFOUNDONLYIFITISNOTPRECEDEDBYNONASCIICHARACTERS,SOSIMPLIFIEDIMPLEMENTATIONSAREALLOWED4IFTHEFILEISAJSPDOCUMENTINXMLSYNTAX,USETHESESTEPSADETERMINTHEPAGECHARACTERENCODINGASDESCRIBEDINAPPENDIXF1OFTHEXML10SPECIFICATIONNOTEWHETHERTHEENCODINGWASNAMEDINTHEENCODINGATTRIBUTEOFTHEXMLPROLOGORJUSTDERIVEDFROMTHEINITIALBTYESBCHECKWHETHERTHEREISAJSPCONFIGURATIONELEMENTWHOSEURLPATTERNMATCHESTHISFILECREADTHEFILEUSINGTHEDETECTEDENCODINGANDSEARCHFORAPAGEENCODINGATTRIBUTEINAELEMENTDREPORTANERRORIFANYOFTHEFOLLOWINGCONDITIONSISMETITHEXMLPROLOGNAMESANENCODINGANDTHEREISCONFIGURATIONELEMENTWHOSEURLPATTERNMATCHESTHISFILEANDWHICHNAMESADIFFERENTENCODINGIITHEXMLPROLOGNAMESANENCODINGANDTHEREISAPAGEENCODINGATTRIBUTEWHICHNAMESADIFFERENTENCODINGIIITHEREAREACONFIGURATIONELEMENTWHOSEURLPATTERNMATCHESTHISFILEANDAPAGEENCODINGATTRIBUTE,ANDTHETWONAMEDIFFERENTENCODINGS5RESETTHEFILEANDREADITUSINGTHEPAGECHARACTERENCODINGJSPECHANGESTHISAPPENDIXLISTSTHECHANGESINTHEJAVASERVERPAGESSPECIFICATIONTHISAPPENDIXISNONNORMATIVEJSPE1CHANGESBETWEENJSP20PFD3ANDJSP20FINALMINORTYPOSANDCLARIFICATIONSAPICHANGES1CHANGEDJAVAXSERVLETJSPTAGEXTJSPFRAGMENTFROMANINTERFACETOANABSTRACTCLASSMADEJSPFRAGMENTINVOKEABSTRACT2ADDEDJSPFRAMENTGETJSPCONTEXTMETHODMINORCLARIFICATIONSTOJSR45LINENUMBERMAPPINGGUIDELINESCLARIFIEDUSEOFINTAGFILESADDEDDOCTYPEROOTELEMENT,DOCTYPEPUBLICANDDOCTYPESYSTEMPROPERTIESTOFOROUTPUTTINGDCTYPEINJSPXMLSYNTAXRQUIRESTHATTHEJSPSTRATUMISTHEDEFAULT,FORJSR45DEBUGGINGADDED118NDETECTIONALGORITHMAPPENDIXADDEDELEMENTSTRUCTUREDIAGRAMSFORTLDSCHEMAREMOVEDREQUIREMENTONORDERINGOFATTRIBUTESETTERCALLS,EXCEPTFORCLARIFIEDTHATATLDISINVALIDIFITSPECIFIES“JSP”ASTHEFORASIMPLETAGEXTENSIONMADETHEJSR45REQUIREMENTOPTIONALCLARIFIEDRANGESOFELINTEGERANDFLOATINGPOINTLITERALSCLARIFIEDSEMANTICSFORCROSSSYNTAXTRANSLATIONTIMEINCLUDESADDEDTHREEEXAMPLESTOILLUSTRATETHESESEMANTICSLOOSENEDCHECKINGFORDUPLICATEPAGEDIRECTIVEATTRIBUTESANDDUPLICATETAGLIBDIRECTIVEDECLARATIONSTOMAKESTATICINCLUDESMOREUSEFULDUPLICATESARENOWOKAYSOLONGASTHEVALUESAREIDENTICALINBOTHPLACESREENABLEDPRELUDESANDCODASFORJSPDOCUMENTSCLARIFIEDTHATTHEURIPASSEDTOTAGLIBRARYVALIDATORVALIDATEISTHEURIINTHEXMLVIEW,NOTNECESSARILYTHEVALUEOFTHEURIATTRIBUTEINTHETAGLIBDIRECTIVEJSPE2CHANGESBETWEENJSP20PFD2ANDJSP20PFD3MINORTYPOSANDCLARIFICATIONSADDEDASAWAYTOQUOTEINTEMPLATETEXTANDATTRIBUTEVALUES,BOTHINSTANDARDANDXMLSYNTAXESTHISENABLEDQUOTINGOFELEXPRESSIONSQUOTINGOFISDISABLEDFORPAGESWHEREELISIGNORED,FORBACKWARDSCOMPATIBILITYDESCRIBEDTHEXMLVIEWFORQUOTINGELEXPRESSIONSCHANGESTOTHEAPI1NULLPOINTEREXCEPTIONMUSTBETHROWNFORNULLNAMEINVARIOUSMETHODS2ALLOWNULLPASSEDASDEFAULTPREFIXINELAPITOINDICATEAPREFIXISREQUIRED3SIMLOETAGSUPPORTMADEJSPBODYANDJSPCONTEXTFIELDSPRIVATEMADEGETJSPBODYANDGETJSPCONTEXTACCESSORSPROTECTED4EXPRESSIONEVALUATORCHANGEDSOTHATONLYONEELEXPRESSIONCANBEPARSEDOREVALUATEDATATIME,WITHNOINTERMIXEDSTATICTEXTREMOVEDDEFAULTPREFIXPARAMETERSANDCHANGEDSOTHATFUNCTIONMAPPERSCANMUTATEBETWEENEXPRESSIONEVALUATORPARSEEXPRESSIONANDEXPRESSIONEVALUATE5UPDATEDJAVADOCSFORJSPWRITERTOINDICATETHATTHERESULTINGTEXTISWRITTENTOTHEBUFFERORUNDERLYINGWRITERDIRECTLY,ANDNOTCONVERTEDTOTHEPLATFORMSJAVASERVERPAGES20SPECIFICATIONDEFAULTENCODINGFIRST,WHICHWOULDMAKENOSENSEINTHISCONTEXTCHANGESTOTAGLIBRARYDESCRIPTORTLD1ADDEDDESCRIPTIONGROUP,EXAMPLEANDEXTENSIONELEMENTSTO2MOVEDDEFINITIONSOFJ2EEEXTENSIBLETYPEANDJ2EETLDEXTENSIONGTYPETOWEBJSPTAGLIBRARY_2_XSD3ADDEDFUNCTIONEXTENSIONELEMENT4UPDATEDTAGNAMEUNIQUENESSTOCHECKFORUNIQUENESSACROSSNAMEELEMENTSBOTHINTAGANDTAGFILEELEMENTSREMOVEDTAGFILENAMEUNIQUENESS5REMOVEDCAPITALVERSIONSOFTAGDEPENDENT,EMPTY,ANDSCRIPTLESSENUMERATIONSINBODYCONTEENTTYPE6REFORMATTEDINDENTATION7ADDEDEXAMPLEOFHOWTOWRITEASCHEMAFORATLDEXTENSIONCHANGESTOTHEEXPRESSIONLANGUAGE1CLARIFIEDTHATTHECONTAINERMUSTCHECKELSYNTAXATTRANSLATIONTIME2REMOVEDRULESFORESCAPINGELEXPRESSIONOUTPUTINELCHAPTER3ADDEDCONDITIONALOPERATORABC4ADDEDCOERCIONRULESFORTARGETTYPELONG5THEEMPTYOPERATORCANNOWBEAPPLIEDTOANYCOLLECTION6INALLCASES,OMITTINGTHEPREFIXOFAFUNCTIONNOWMEANSTHEFUNCTIONISASSOCIATEDWITHTHEDEFAULTNAMESPACEEBNFGRAMMARCHANGES1BETTERHANDLINGFORSYNTAXERRORSFORUNMATCHEDACTIONTAGS2ADDEDLOGICTOHANDLEQUOTINGELEXPRESSIONSCHANGEDCONVERSIONRULESFORATTRIBUTEVALUESFORTHEEMPTYSTRING“”TOMATCHELSEMANTICSREMOVEDSYNCHRONIZATIONOFVARIABLESFROMTHEPAGETOTHETAGFILE,BUTKEPTSYNCHRONIZATIONFROMTAGFILETOPAGETHISISCONSISTENTWITHCLASSICTAGSCHANGEDTHEDEFAULTVALUEFORTHERTEXPRVALUEATTRIBUTEOFTHEATTRIBUTEDIRECTIVETOTRUE118NCHANGES1DURINGAORTHECONTAINERISNOWREQUIREDTOENCODETHEPARAMETERSUSINGTHECHARACTERENCODINGFROMTHEREQUESTOBJECT2CHARACTERENCODINGISNOWDETERMINEDFOREACHFILESEPARATELY,EVENIFONEFILEINCLUDESANOTHERUSINGTHEINCLUDEDIRECTIVECHANGEDTHESEMANTICSOFSOTHATAVALUEOFFALSESIMPLYINDICATESTHERESOURCEISNOTAJSPDOCUMENT,BUTRATHERAJSPPAGECHANGEDJSPXEXTENSIONTOONLYWORKWITHASERVLET24ORGREATERWEBXMLSYNCHRONIZEDBEHAVIOROFERRORPAGESWITHTHESERVLETSPECIFICATIONCHANGEDDYNAMICATTRIBUTESATTRIBUTEOFTHETAGDIRECTIVETOSPECIFYTHENAMEOFAMAPTOPLACETHEDYNAMICATTRIBUTESINTO,INSTEADOFPLACINGTHEMDIRECTLYINTHEPAGESCOPEDYNAMICATTRIBUTESWITHAURIAREIGNOREDADDEDALIASATTRIBUTEANDNAMEFROMATTRIBUTEMECHANISMFORTAGFILESCLARIFIEDBEHAVIOROFTAGLIBRARYVALIDATORSWHENNAMESPACESAREREDEFINEDINJSPDOCUMENTSADDEDNONNORMATIVEGUIDELINESFORJSR45LINENUMBERMAPPINGCLARIFIEDTHATDTDVALIDATIONOFJSPDOCUMENTSMUSTBEDONEBYCONTAINERSCLARIEDTHATINJSPDOCUMENTSTHEPREFIX“JSP”ISNOTFIXEDFORTHENAMESPACEHTTP/JAVASUNCOM/JSP/PAGECLARIFIEDTHAT,IFAISNOTACUSTOMACTION,DOESNOTCONTAINAREQUESTTIMEATTRIUTEVALUEWHEREASDOESJSPE3CHANGESBETWEENJSP2PFDANDJSP2PFD2MINORTYPOSANDCLARIFICATIONSCLARIFIEDHANDLINGOFNONSTRINGTYPESWHENUSINGCLARIFIEDTHATJSPCONFIGURATIONSETTINGSDONOTAPPLYTOTAGFILESCHANGEDTHEWAYELEXPRESSIONSANDSCRIPTINGISENABLED1REMOVEDISSCRIPTINGENABLEDATTRIBUTEFROMPAGEDIRECTIVE2CHANGEDJSPCONFIGURATIONELEMENTTOCLARIFIEDTHATELEXPRESSIONSCANBEUSEDTOPROVIDEREQUESTTIMEATTRIBUTEVALUESASWELLJSP13971CONSTRUCTORSPUBLICVALIDATIONMESSAGECREATEAVALIDATIONMESSAGETHEMESSAGESTRINGSHOULDBENONNULLTHEVALUEOFIDMAYBENULL,IFTHEMESSAGEISNOTSPECIFICTOANYXMLELEMENT,ORIFNOJSPIDATTRIBUTESWEREPASSEDONIFNONNULL,THEVALUEOFIDMUSTBETHEVALUEOFAJSPIDATTRIBUTEFORTHEPAGEDATAPASSEDINTOTHEVALIDATEMETHODPARAMETERSIDEITHERNULL,ORTHEVALUEOFAJSPIDATTRIBUTEMESSAGEALOCALIZEDVALIDATIONMESSAGEJSP13972METHODSPUBLICJAVALANGSTRINGGETIDGETTHEJSPIDNULLMEANSTHATTHEREISNOINFORMATIONAVAILABLERETURNSTHEJSPIDINFORMATIONPUBLICJAVALANGSTRINGGETMESSAGEGETTHELOCALIZEDVALIDATIONMESSAGERETURNSAVALIDATIONMESSAGEJSP1398TAGEXTRAINFOSYNTAXPUBLICABSTRACTCLASSTAGEXTRALNFODESCRIPTIONOPTIONALCLASSPROVIDEDBYTHETAGLIBRARYAUTHORTODESCRIBEADDITIONALTRANSLATIONTIMEINFORMATIONNOTDESCRIBEDINTHETLDTHETAGEXTRAINFOCLASSISMENTIONEDINTHETAGLIBRARYDESCRIPTORFILETHISCLASSCANBEUSED1TOINDICATETHATTHETAGDEFINESSCRIPTINGVARIABLES2TOPERFORMTRANSLATIONTIMEVALIDATIONOFTHETAGATTRIBUTESITISTHERESPONSIBILITYOFTHEJSPTRANSLATORTHATTHEINITIALVALUETOBERETURNEDBYCALLSTOGETTAGINFOCORRESPONDSTOATAGINFOOBJECTFORTHETAGBEINGTRANSLATEDIFANEXPLICITCALLTOSETTAGINFOISDONE,THENTHEOBJECTPASSEDWILLBERETURNEDINSUBSEQUENTCALLSTOGETTAGINFOTHEONLYWAYTOAFFECTTHEVALUERETURNEDBYGETTAGINFOISTHROUGHASETTAGINFOCALL,ANDTHUS,TAGEXTRAINFOSETTAGINFOISTOBECALLEDBYTHEJSPTRANSLATOR,WITHATAGINFOOBJECTTHATCORRESPONDSTOTHETAGBEINGTRANSLATEDTHECALLSHOULDHAPPENBEFOREANYINVOCATIONONVALIDATEANDBEFOREANYINVOCATIONONGETVARIABLEINFONOTEITISAERRORFORATAGDEFINITIONINATLDWITHONEORMOREVARIABLESUBELEMENTSTOHAVEANASSOCIATEDTAGEXTRAINFOIMPLEMENTATIONTHATRETURNSAVARIABLEINFOARRAYWITHONEORMOREELEMENTSFROMACALLTOGETVARIABLEINFOJSP13981CONSTRUCTORSPUBLICTAGEXTRAINFOSOLECONSTRUCTORJSP13982METHODPUBLICFINALTAGINFOGETTAGINFOGETTHETAGINFOFORTHISCLASSRETURNSTHETAGINFOINSTANCETHISINSTANCEISEXTENDINGPUBLICVARIABLEINFOGETVARIABLEINFOINFORMATIONONSCRIPTINGVARIABLESDEFINEDBYTHETAGASSOCIATEDWITHTHISTAGEXTRAINFOINSTANCEREQUESTTIMEATTRIBUTESAREINDICATEDASSUCHINTHETAGDATAPARAMETERPARAMETERSDATATHETAGDATAINSTANCERETURNSANARRAYOFVARIABLEINFODATA,ORNULLORAZEROLENGTHARRAYIFNOSCRIPTIONVARIABLESARETOBEDEFINEDPUBLICBOOLEANISVALIDTRANSLATIONTIMEVALIDATIONOFTHEATTRIBUTESREQUESTTIMEATTRIBUTESAREINDICATEDASSUCHINTHETAGDATAPARAMETERNOTETHATTHEPREFERREDWAYTODOVALIDATIONISWITHTHEVALIDATEMETHOD,SINCEITCANRETURNMOREDETAILEDINFORMATIONPARAMETERSDATATHETAGDATAINSTANCERETURNSWHETHERTHISTAGINSTANCEISVALIDSEEALSOPUBLICVALIDATIONMESSAGEVALIDATEPUBLICFINALVOIDSETTAGINFOTRANSLATIONTIMECLASSESSETTHETAGINFOFORTHISCLASSPARAMETERSTAGINFOTHETAGINFOTHISINSTANCEISEXTENDINGPUBLICVALIDATIONMESSAGEVALIDATETRANSLATIONTIMEVALIDATIONOFTHEATTRIBUTESREQUESTTIMEATTRIBUTESAREINDICATEDASSUCHINTHETAGDATAPARAMETERBECAUSEOFTHEHIGHERQUALITYVALIDATIONMESSAGESPOSSIBLE,THISISTHEPREFERREDWAYTODOVALIDATIONISVALIDJSP20ANDHIGHERCONTAINERSCALLVALIDATEINSTEADOFINVALIDTHEDEFAULTIMPLEMENTATIONOFTHISMETHODISTOCALLISVALIDIFISVALIDTHEDEFAULTIMPLEMENTATIONOFTHISMETHODISTOCALLISVALIDIFISVALIDRETURNSFALSE,AGENERICVALIDATIONMESSAGEISRETURNEDINDICATINGISVALIDRETURNEDFALSEPARAMETERSDATATHETAGDATAINSTANCERETURNSANULLOBJECT,ORZEROLENGTHARRAYIFNOERRORS,ANARRAYOFVALIDATIONMESSAGESOTHERWISEJSP1399TAGDATASYNTAXPUBLICCLASSTAGDATAINPLEMENTSJAVALANGCLONEABLEALLIMPLEMENTEDINTERFACESJAVALANGCLONEABLEDESCRIPTIONTHEATTRIBUTEINFORMATIONFORATAGINSTANCETAGDATAISONLYUSEDASANARGUMENTTOTHEISVALID,VALIDATE,ANDGETVARIABLEINFOMETHODSOFTAGEXTRAINFO,WHICHAREINVOKEDATTRANSLATIONTIME中文翻译JSPA包装JSPPAGES这个附录显示了两个把JSPPAGE包装成WAR的例子。把JSPPAGE包装成WAR是为了能够把JSPPAGE传输的WEB容器中。在第一个例子里，JSPPAGE是以资源的形式进行传输的。这个是最普通的传输模式。在第二个例子中，JSPPAGE被编译成一个仅应用SERVLET24和JSP20API的SERVLET，然后SERVLET被包装成一个带有部署描述符的WAR。这个看起来更像一个能应用于任何平台的原始JSP文件。JSPA1A非常简单的JSPPAGE。（代码略）JSPA2把JSPPAGE作为资源包装成一个WAR文件如果想把一个JSPPAGE包装成一个WAR文件，仅需要把它放在默认地址下的JSP文件中即可。然后那个默认的JSPPAGE扩展映射能找到它。因为WEBXML是非常精细的JAVASERVERPAGES20定义。（代码略）JSPA3把SERVLET编译成JSPPAGE作为可以选择的方法，我们将要说明下编程人员怎么能将一个JSPPAGE编译成一个能在一个JSP容器中运行的SERVLET类。JSPPAGE被编译成一个SERVLET仅需要用一些接口关系。SERVLET代买仅依靠JSP20和SERVLET24API，具体如下。（代码略）JSPBJSP的WEBXML元素这个附录描述了SERVLET24WEB应用部署描述符的JSP元素，这个工作是用XML模型实现的。SERVLET24部署描述符包括在第一章我们已经提到过的定义。这是一个同样的XML模式像HTTP/JAVASUNCOM/XML/NS/J2EE/JSP_2_0XSD。（代码略）JSPCTAG标签描述符格式这个附录包括XML模式和DTD文件，这些都应用TAG标签库，可以用于每个JSP版本。所有的JSP20容器都要求能够解析和兼容所有的在这个附录中涉及的TLD格式。所列出的所有格式以时间顺序从近到远的形式进行说明。JSPC1TLD,JSP20的XML式样表。下面是一个XML式样表文件，它以JSP20的格式描述了一个TAG标签描述符。（代码略）JSPC2TLD,JSP12的TDT下面是一个DTD文件，它用JSP12格式描述了一个TAG标签描述符文件。这个是一样的DTD文件请登陆HTTP/JAVASUNCOM/DTD/WEBJSPTAGLIBRARY_1_2DTD。这是一个定义JAVASERVERPAGES12标记库描述符的DTD文件。一个TAG标签库是一个包括一个标签描述符文件，一些常用继承类的和一些其他的要求继承ACTION的资源的JAR文件。当部署一个JAR文件的时候，TAG标签描述符标签库必须在METAINF文件夹下活着它下面的一个子文件夹。当直接部署一个WEB应用的时候，TAG标签描述符文件必须一直在WEBINF目录下或者它的子目录。包装TAG标签库必须至少有一个TAG标签描述分拣。JSP11允许仅有一个TLD但是在JSP12只允许双重TAG标记库。（代码略）JSPD页面代码研究这个附录详细阐述了运算法则内容，这些是为了JSP文件字符集的应用。看看JSP4的章节，国际问题是在哪里用到了运算法则。设计这个运算法则是为了最大程度的方便页面制作人员。JSPD1探测运算法则1决定资源文件是否是一个满足符号标准的JSPPAGE，或者是一个JSPXMLJSP文档。A如果有一个元素以标签命名这个文件，并且它的值是TRUE，则这个文件是一个JSP文档，而如果值是FALSE，则文件不是JSP文档B如果文件名的扩展名是“JSPX”，则这个文件是一个JSP文档。C在文件内找到一个根元素I从前四个字节决定起始编码，就像在附录F1中描述的一样。如果字符序列是“3C3F786D”，用ISO88591；如果字符序列是“4C6FA794“用IBM037；如果是其他情况用UTF或者UCS，这些字符集在附录中已经给出。JAVASERVERPAGES20定义II阅读文件找到起始的字符集然后寻找一个JSP根元素。如果那个元素被找到并且是根元素，则这个文件是一个XML符号的JSP文档否则这个文件是一个标准的JSPPAGE文件。2重置文件3如果文件是一个JSPPAGE标准符号文件，用以下步骤。A查实是否有一个JSP配置元素,并且URL模式匹配这个文件。B寻找文件起始处的字符集，再查看一个PAGEENCODING属性在PAGE声明处。这个定义要求那个属性是被找到如果它存在字符集，所以使继承简单化是可以的。C抛出一个错误，如果有一个设置元素，它的RUL模式需要匹配这个文件，字符集属性和另个名字不同的字符集。D如果有一个设置原属的URL模式匹配这个文件，并且页面字符接是以这个名字命名的。E有一个字符集属性，页面字符集以这个字符集属性的字符集相同。F读到一个在起始处有字符编码的文件，寻找一个字符集值在一个CONTENTTYPE属性中，在一个页面声明处。如果它存在，页面编码就是一个以这个字符集值为字符集的页面。定义要求找到比NONASCII字符集早的字符集属性。所以简单的继承是可以的。G否则页面编码就是ISO885914如果那个文件一个XML标记的JSP文档，用以下步骤。A选择一个页面字符编码集，就像在附录F1中定义的那样。表明字符编码集是否有正确的属性命名。B核实是否有一个JSP设置元素，并且它的URL模式酦醅这个文件。JAVASERVERPAGES20定义C使用侦测字符集阅读文件，找到字符集属性标签。D如果遇见下面的任何错误，抛出一个错误报告。IXML需要命名一个字符集，有一个设置元素，并且它的URL模式匹配这个不同字符集的文件。IIXML命名一个字符集，有一个不同字符集的PAGEENCODING属性。III有一个字符集设置元素，它的URP模式匹配这个文件，但是PAGEENCODING属性的字符集名称却不同。5重新设置文件，用页面字符集阅读它。JSPE变化这个附录列出了JAVASERVERPAGES定义的变化。JSPE1JSP20PFD3和JSP2最终版的区别。更加简洁的界面。API变化1一些JAVA接口变成了抽象类。增添了JSPFRAGMENTINVOKE（）抽象类。2新增了JSPFRAGMENG。GETJSPCONTEXT（）方法。增强了兼容性，可以抛出问题在JSP12和JSP20之间。新增了一些新的界面功能。在TAG文件中，用声明。为了在JSPXML标记中输出DOCTYPE，在标签中增加了DOCTYPEROOTELEMENT元素，DOCTYPEPUBLIC和DOCTYPESYSTEM属性。要求JSP层是默认的可以用JSP45DEBUGGING调试。新增118N算法附录。为TLD模式新增元素结构表。除了标签，移除了属性顺序设置要求。JAVASERVERPAGES20定义如果定义JSP在体内仅用简单的TAG扩展，那么这个TLD是残废的。新增了JSP45要求选项。声明了EL合集和浮点数的作用范围。声明了语言的的可扩展标记，为了解决这些语言问题。为JSP文档重置了插件。为普通TAGS标记移除了ID的特殊动作。虚拟的，没有容器继承这个特性而需要满足这个要求，在JSP20打断应用的时候。检查URI路径是在XML视图上的URI，确保URI属性值在TAGLIB中。JSPE2从JSP20PFD2到JSP20PFD3的变化更加简洁的声明。在模板文档和属性值中新增了方法，它可以引用符号，这个引用方法在标准JSP界面中和XML符号中都可以使用。这个是已经可以使用的EL表达式引用符号。符号是不可以使用的在EL标记被忽略的页面中。描述XML视图为引用EL表达式。API变化1在各种方法中空指针异常必须被抛出。2为了表明一个前缀是必要的，在ELAPI中允许空作为默认前缀。3简单的TAG支持使JSPBODY和JSPCONTEXT域私有。使一些方法的作用范围变成保护的。4表达程序EL表达式可以被解析或者求值在一些情况下。移除了默认前缀传值。5为了可以把参数传入缓冲区，更新了JAVA虚拟机中的一些方法。可以在平台上直接写，不必再转换平台。JAVASERVERPAGES20定义在CONTEXT属性中添加了新的字符编码集。TLD的变化1增加了描述组，例子和扩展元素。2J