1、JSP技术外文文献外文文献 JSPTechnology andServlets JSP profile JSP(JavaServerPages)isinitiatedbySunMicrosystems,Inc.,withmanycompaniestoparticipateintheestablishmentofadynamicwebpagetechnicalstandards.JSPtechnologysomewhatsimilartoASPtechnology,itisinthetraditionalHTMLwebpagedocument(x.htm,x.html)toinserttheJa
2、vaprogrammingparagraph(Scriptlet)andJSPtag(tag),thusJSPdocuments(x.jsp).UsingJSPdevelopmentoftheWebapplicationiscrossthatcanrunonLinux,isalsoavailableforotheroperatingsystems. JSPtechnologytousetheJavaprogramminglanguagepreparedbythecategoryofXMLtagsandscriptlets,toproducedynamicpagespackageprocessi
3、nglogic.Pagealsovisitbytagsandscriptletsexistintheservicessideoftheresourcesoflogic.JSPpagelogicandwebpagedesignanddisplayseparation,supportreusablecomponent-baseddesign,Web-basedapplicationdevelopmentisrapidandeasy. WebserverinthefaceofvisitsJSPpagerequest,thefirstimplementationoftheproceduresof,an
4、dthentogetherwiththeresultsoftheimplementationofJSPdocumentsinHTMLcodewiththereturntothecustomer.InserttheJavaprogrammingoperationofthedatabasecanbereorientedwebsites,inordertoachievetheestablishmentofdynamicpagesneededtofunction.JSPandJavaServlet,isintheimplementationoftheserver,usuallyreturnedtoth
5、eclientisanHTMLtext,aslongastheclientbrowserwillbeabletovisit. JSP1.0specificationofthefinalversionislaunchedinSeptember1999,Decemberhasintroduced1.1specifications.AtpresentrelativelynewisJSP1.2norms,JSP2.0normsofthedrafthasalsobeenintroduced.JSPpagesfromHTMLcodeandJavacodeembeddedinoneofthecomponen
6、ts. JSscriptlanguagesynopsis JSisjavascrip,JavascriptisonekindthescriptlanguagewhichcomesbytheNetscapeLiveScriptdevelopment,themainpurposeistosolvetheserverterminallanguage,forinstancePerl,carry-overspeedquestion.Atthattimeservedtheendtoneedtocarryontheconfirmationtothedata,becausethenetworkspeedwas
7、quiteslow,onlythen28.8kbps,theconfirmationstepwastestimeweretoomany.ThereforeNetscapebrowserNavigatorhasjoinedJavascript,hasprovidedthedataconfirmationbasicfunction. TheJavaScriptofficialnameis“ECMAScript.ThisstandardbyECMAorganizationdevelopmentandmaintenance.ECMA262istheofficialJavaScriptstandard.
8、ThisstandardbasedonJavaScript(Netscape)andJScript(Microsoft).Netscape(Navigator2.0)BrendanEichhasinventedthislanguage,startedfrom1996,alreadyappearedinallNetscapeandintheMicrosoftbrowser.TheECMA262developmentbeganin1996,in1997July,theECMAgeneralmeetinghasaccepteditsfirstedition. Thescriptusesonespec
9、ificdescriptivelanguage,restsoncertainformcompilationtobepossibletheexecutiondocument,isalsocalledasgreatorthebatchrundocument.Thescriptusuallymaytransfertemporarilybytheapplicationprocedureandcarryout.Eachkindofscriptpresentwidelyisappliedinthehomepagedesign,becausethescriptnotonlymayreducethehomep
10、agethescaleandraisesthehomepagebrowsingspeed,moreovermayenrichthehomepageperformance,likeanimation,soundandsoon.Citesamostcommonexample,whenweclickinthehomepagetheEmailaddresscantransferOutlookExpressortheFoxmailthiskindofmailsoftwareautomatically,isrealizesthroughthescriptfunction.Alsobecauseofscri
11、ptthesecharacteristics,thehumanwhoharborsulteriormotivesbysomeareoftenusing.Forexamplejoinssomedestructioncomputersystemsorderinthescript,likethisworksastheuserbrowsinghomepage,oncetransfersthiskindofscript,willthencausetheuserthesystemtocomeundertheattack.Thereforetheusershouldactaccordingtovisitsh
12、omepagethetrustdegreeselectivesecurityrank,speciallyregardingtheseitselfcontentontheillegalhomepage,donotpermittheusescripteasily.Through“thesafeestablishmentthedialogbox,thechoice“thescriptunderoptioneachkindofestablishmentmaywitheaserealizetoscriptbeingforbidandbeginsusing. JSPandServlets Thetechn
13、ologyofJSPandServletisthemostimportanttechnologywhichuseJava technologytoexploitrequestofserver,anditisalsothestandardwhichexploitbusinessapplication.Javadevelopersprefertouseitforavarietyofreasons,oneofwhichisalreadyfamiliarwiththeJavalanguageforthedevelopmentofthistechnologyareeasytolearnJavatothe
14、otheris“apreparation,runeverywhere“tobringtheconceptofWebapplications,Toachievea“one-preparedeverywhererealized.“Andmoreimportantly,iffollowedsomeoftheprinciplesofgooddesign,itcanbesaidofseparatingandcontenttocreatehigh-quality,reusable,easytomaintainandmodifytheapplication.Forexample,ifthedocumentinHTM
