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1、CombiningJSPandServletsThetechnologyofJSPandServletisthemostimportanttechnologywhichuseJavatechnologytoexploitrequestofserver,anditisalsothestandardwhichexploitbusinessapplication.Javadevelopersprefertouseitforavarietyofreasons,oneofwhichisalreadyfamiliarwiththeJavalanguagef
2、orthedevelopmentofthistechnologyareeasytolearnJavatotheotheris"apreparation,runeverywhere"tobringtheconceptofWebapplications,Toachievea"one-preparedeverywhererealized."Andmoreimportantly,iffollowedsomeoftheprinciplesofgooddesign,itcanbesaidofseparatingandcontenttocreatehigh-
3、quality,reusable,easytomaintainandmodifytheapplication.Forexample,ifthedocumentinHTMLembeddedJavacodetoomuch(script),willleadthedevelopedapplicationisextremelycomplex,difficulttoread,itisnoteasyreuse,butalsoforfuturemaintenanceandmodificationwillalsocausedifficulties.Infact,
4、CSDNtheJSP/Servletforum,canoftenseesomequestions,thecodeisverylong,canlogicisnotveryclear,alargenumberofHTMLandJavacodemixedtogether.Thisistherandomdevelopmentofthedefects.EarlydynamicpagesmainlyCGI(CommonGatewayInterface,publicGatewayInterface)technology,youcanusedifferentl
5、anguagesoftheCGIprograms,suchasVB,C/C++orDelphi,andsoon.ThoughthetechnologyofCGIisdevelopedandpowerful,becauseofdifficultiesinprogramming,andlowefficiency,modifycomplexshortcomings,11itisgraduallybeingreplacedbythetrend.Ofallthenewtechnology,JSP/Servletwithmoreefficientandea
6、sytoprogram,morepowerful,moresecureandhasagoodportability,theyhavebeenmanypeoplebelievethatthefutureisthemostdynamicsiteofthefuturedevelopmentoftechnology.SimilartoCGI,Servletsupportrequest/responsemodel.Whenacustomersubmitarequesttotheserver,theserverpresentedtherequestServ
7、let,Servletresponsibleforhandlingrequestsandgeneratearesponse,andthengavetheserver,andthenfromtheserversenttothecustomer.AndtheCGIisdifferent,Servletnotgenerateanewprocess,butwithHTTPServeratthesameprocess.Itthreadsthroughtheuseoftechnology,reducetheservercosts.Servlethandli
8、ngoftherequestprocessisthis:Whenreceivedfromtheclient'srequest,callingservi
