Head First Servlet and JSP

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1、Chapter1.WhyuseServlets&JSPs?1introandoverviewWhyuseServlets&JSPs?Youfool!YoumustuseHah!IknowServletsandJSPs.IfyouCGI.MywebsitewillcontinuetowritePerlruletheworld.scripts,Iwilldestroyyou.Webapplicationsarehot.Sure,GUIapplicationsmightuseexoticSwingwidgets,buthowmanyGUIappsdoyo

2、uknowthatareusedbymillionsofusersworld-wide?Asawebappdeveloper,youcanfreeyourselffromthegripofdeploymentproblemsallstandaloneappshave,anddeliveryourapptoanyonewithabrowser.Buttobuildatrulypowerfulwebapp,youneedJava.Youneedservlets.YouneedJSPs.BecauseplainoldstaticHTMLpagesares

3、o,well,1999.Today¶susersexpectsitesthataredynamic,interactive,andcustom-tailored.Withinthesepagesyou¶lllearntomovefromwebsitetowebapp.thisisanewchapter1Chapter1.WhyuseServlets&JSPs?HeadFirstServletsandJSPByBertBates,KathySierra,BryanBashamISBN:0596005407Publisher:O'ReillyPrepa

4、redforStephenGoss,SafariID:stephengoss@gmx.netPrintPublicationDate:8/1/2004Usernumber:747221Copyright2006,SafariBooksOnline,LLC.ThisPDFisexclusivelyforyouruseinaccordancewiththeSafariTermsofService.Nopartofitmaybereproducedortransmittedinanyformbyanymeanswithoutthepriorwritten

5、permissionforreprintsandexcerptsfromthepublisher.RedistributionorotherusethatviolatesthefairusepriviledgeunderU.S.copyrightlaws(see17USC107)orthatotherwiseviolatestheSafariTermsofServiceisstrictlyprohibited.Chapter1.WhyuseServlets&JSPs?of¿cialSunexamobjectivesServlets&JSPoverv

6、iewCoverageNotes:CopyrightSafariBooksOnline#7472211.14ForeachoftheHTTPMethods(suchasGET,Qebl_gb`qfsbpfkqefppb`qflk^ob`lsbobaPOST,HEAD,andsoon):`ljmibqbivfk^klqebo`e^mqbo)plqefkhlcqefp`e^mqbo^p^äopq*illhclrka^qflkclo*Describebene¿tsoftheHTTPMethodte^q`ljbp

7、i^qbo+Fklqebotloap)alk$qtloov^_lrqäkfpefkdqefp`e^mqbohkltfkd%^ka*DescribefunctionalityoftheHTTPMethodobjbj_bofkd&^kvqefkdpmb`fä`coljqebpbl_gb`qfsbp8grpqrpbfqclo_^`hdolrka+Fcvlr*ListtriggersthatmightcauseaClient^iob^avhkltqebpbqlmf`p)vlr`^kgrpqp

8、hfj(usuallyaWebbrowser)tousethemethodqefp`e^mqbo^kagrjmq