基于jsp的在線考試系統(tǒng)設(shè)計(jì)與實(shí)現(xiàn)畢業(yè)論文-資料下載頁(yè)
2025-06-27 17:56本頁(yè)面
【正文】 s”indeclarationelements..JavaScriptisusedforthefirstkindisbrowser,thedynamicgeneralpurposeofclientscriptinglanguage.Netscapefirstproposedin1995,butitsJavaScriptLiveScriptcalled.ThenquicklyNetscapeLiveScriptrenamedJavaScript,Javadeveloperswiththemfromthesameissuedastatement.AstatementJavaandJavaScriptwillplementeachother,buttheyaredifferent,sothetechnologyofthemanydismissedthemisunderstandingofthetwotechnologies.JavaScripttocreateuserinterfacecontrolprovidesascriptinglanguage.Infact,inthebrowserintotheJavaScriptcodelogic.Itcansupportsucheffect:whenthecursorontheWebpageofamobileuserinputvalidationortransformimage.MicrosoftalsowriteouttheirJavaScriptversionandtheJScriptcalled.MicrosoftandNetscapesupportJavaScriptandJScriptaroundacorecharacteristicsandEuropeanManufacturersby(ECMA)standardsorganization,thecontrolstandardofscriptinglanguage.ECMAitsscriptinglanguageECMAScriptnamed.ServletsandJSPsoftenincludefragmentsofinformationthataremontoanorganization,suchaslogos,copyrights,trademarks,ornavigationbars.Thewebapplicationusestheincludemechanismstoimporttheinformationwhereveritisneeded,sinceitiseasiertochangecontentinoneplacethentomaintainitineverypieceofcodewhereitisused.Someofthisinformationisstaticandeitherneverorrarelychanges,suchasanorganization39。slogo.Inothercases,theinformationismoredynamicandchangesoftenandunpredictably,suchasatextualgreetingthatmustbelocalizedforeachuser.Inbothcases,youwanttoensurethattheservletorJSPcanevolveindependentlyofitsincludedcontent,andthattheimplementationoftheservletorJSPproperlyupdatesitsincludedcontentasnecessary.Youwanttoincludearesourcethatdoesnotchangeverymuch(suchasapagefragmentthatrepresentsaheaderorfooter)inaJSP.UsetheincludedirectiveintheincludingJSPpage,andgivetheincludedJSPsegmenta.jspfextension.YouwanttoincludecontentinaJSPeachtimeitreceivesarequest,ratherthanwhentheJSPisconvertedtoaservlet.Usethejsp:includestandardaction.YouwanttoincludeafiledynamicallyinaJSP,basedonavaluederivedfromaconfigurationfile.Usethejsp:includestandardaction.Providethevalueinanexternalpropertiesfileorasaconfigurationparameterinthedeploymentdescriptor.YouwanttoincludeafragmentofanXMLfileinsideofaJSPdocument,orincludeaJSPpageinXMLsyntax.Usethejsp:includestandardactionfortheincludesthatyouwanttooccurwitheachrequestoftheJSP.Usethejsp:elementiftheincludeactionshouldoccurduringthetranslationphase.YouwanttoincludeaJSPsegmentfromoutsidetheincludingfile39。scontext.Usethec:importTheoperationprincipleandtheadvantagesofJSPtagsInthissectionoftheoperatingprincipleofsimpleintroductionJSPandstrengths.ForthefirsttimeinaJSPdocumentsrequestedbytheengine,JSPServletistransformedintoadocumentJSP.ThisengineisitselfaServlet.TheoperatingprocessoftheJSPshownbelow:(1)theJSPengineputtheJSPfilesconvertingaJavasourcefiles(Servlet),ifyoufindthefileshaveanygrammarmistakeJSP,conversionprocesswillinterrupt,andtotheserverandclientoutputerrormessages.(2)ifconverted,withtheengineJSPjavacJavasourcefilepilerintoacorrespondingscaleupfiles.(3)tocreateatheServlet(JSPpage),thetransformationoftheServletjspInit()methodwasexecuted,jspInit()methodinthelifecycleofServletexecutedonlyonce.(4)jspService()methodinvocationtotheclientrequests.Foreachrequest,JSPenginetocreateanewthreadforprocessingtherequest.IfyouhavemultipleclientsandrequesttheJSPfiles,JSPenginewillcreatemultiplethreads.Eachclientrequestsathread.Toexecutemultithreadcangreatlyreducetherequirementofsystemresources,improvingtheconcurrencyvalueandresponsetime.Butalsoshouldnoticethemultithreadprogramming,duetothelimitedServletalwaysinresponsetomemory,soisveryfast.注：譯文樣式同前面正文。譯文內(nèi)容應(yīng)與英文原文一致！閱后刪除此文本框。(5)ifthefilehasbeenmodified.TheJSP,serverwillbesetaccordingtothedocumenttodecidewhethertorepile,ifneedtorepile,willreplacetheServletpilethememoryandcontinuetheprocess.譯文：JSP技術(shù)簡(jiǎn)介及特點(diǎn)JSP（JavaServerPages）技術(shù)是由Sun公司發(fā)布的用于開(kāi)發(fā)動(dòng)態(tài)Web應(yīng)用的一項(xiàng)技術(shù)。它以其簡(jiǎn)單易學(xué)、跨平臺(tái)的特性，在眾多動(dòng)態(tài)Web應(yīng)用程序設(shè)計(jì)語(yǔ)言中異軍突起，在短短幾年中已經(jīng)形成了一套完整的規(guī)范，并廣泛地應(yīng)用于電子商務(wù)等各個(gè)領(lǐng)域中。在國(guó)內(nèi)，JSP現(xiàn)在也得到了比較廣泛的重視，得到了很好的發(fā)展，越來(lái)越多的動(dòng)態(tài)網(wǎng)站開(kāi)始采用JSP技術(shù)。下面就對(duì)JSP及其相關(guān)技術(shù)進(jìn)行簡(jiǎn)單的介紹。JSP技術(shù)可以以一種簡(jiǎn)捷而快速的方法生成Web頁(yè)面。使用JSP技術(shù)的Web頁(yè)面可以很容易地顯示動(dòng)態(tài)內(nèi)容。JSP技術(shù)的設(shè)計(jì)目的是使得構(gòu)造基于Web的應(yīng)用程序更加容易和快捷，而這些應(yīng)用程序能夠與各種Web服務(wù)器、應(yīng)用服務(wù)器、瀏覽器和開(kāi)發(fā)工具共同工作。JSP技術(shù)不是惟一的動(dòng)態(tài)網(wǎng)頁(yè)技術(shù)，也不是第一個(gè)，在JSP技術(shù)出現(xiàn)之前就已經(jīng)存在幾種優(yōu)秀的動(dòng)態(tài)網(wǎng)頁(yè)技術(shù)，如CGI、ASP
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