54 Task 9 Background Administration PagePHP动态网站开发项目教程课件

Project3OverwritetheMemberAdministrationSystemwiththePHPFrameworkLaravelTask9BackgroundAdministrationPageSchoolofSoftware,ChengduPolytechnicLecturer:MuQichunWehavecreatedarouteforredirectingtotheadministratorpagebefore.Next,let'scopyadmin.phpintheoriginalsystemtoresources/admin,andrenameitasindex.blade.php.Openthefile,deletethefileincludingtheheaddeterminationpermissionandotherPHPcodes,addandtestanavtemplate.Makesurethepagecanbecorrectlydisplayedatfirst.BackgroundAdministrationPageBackgroundAdministrationPageObviously,asthispageisthebackgroundAdministrationpage,itneedstodetermineifanadministratorhasloggedin.Theoriginalcodeusesthe"checkAdmin.php"filetodetermineiftheadministratorhasloggedthroughsession.InLaravel,wecanuseamiddlewaretodeterminepermissions.InLaravel,amiddlewareisusedforfilteringHTTPrequests,withdifferentlogicaloperationsexecutedaccordingtodifferentrequests.Themiddlewarecaninterceptandprocessrequesteddata,checkthedata,anddetermineifthedatacanbetransmittedtoanextmiddlewareaftermakingthelogicalprocessing.Forexample,whenweaccessonebackgroundpage,amiddlewareisusedfordeterminingpermission,anddeterminingwhetherthecurrentloggeduserisanadministrator.Ifno,redirecttothelogininterface.Ifyes,enterthenextpageanddisplay.BackgroundAdministrationPageNext,let'screateamiddlewareataterminal:Thecreatedmiddlewareisinapp/http/middleware.Let'smodifythemiddleware.BackgroundAdministrationPageThelogicistodetermineifisAdmininsessionis1ornot.Ifyes,itmeansthattheadministratorhasloggedintothesystem,andthebackgroundAdministrationpagewillnormallydisplay.Otherwise,theloginpagewilldisplay.Ifamiddlewarefailstoworkafteritiscreated,youneedtoregisterthemiddleware.Justopentheapp/Http/Kernel.phpfile,andregisterthemiddleware.TherearetwotypesofmiddlewaresinLaravel,i.e.aglobalmiddlewareandaroutemiddleware.TheglobalmiddlewarewillrunineachHTTPrequestsofanApp,whiletheroutemiddlewarewillbeassignedtoaspecificrouteforexecution.Wejustneedtoregistertheroutemiddleware,andexecutethemiddlewareonlywhenaccessingaspecificpage.Addcodesbelowtotheroutemiddleware:BackgroundAdministrationPageAtlast,usethemiddlewareinaroute.Asweneedtodetermineifauserlogsintothesystemasanadministratorwhenenteringtheadministratorpage,weneedtomodifythe"/admin/index"route:Next,let'stesttheeffectofthemiddleware.Youcanseethatiftheuserdoesnotlogintothesystemasanadministrator,thesystemwillautomaticallyredirecttothelogininterfacewhentheuserdirectlyclicks"BackgroundAdministration"fromthenavigationlink.BackgroundAdministrationPageLastly,wealsoneedtooutputeachpieceofdataontheadministratorpage.Whentheoriginalloginsucceeds,wewillredirecttotheadministratorinterface,withtwoparameters,includingtheusernameofthecurrentloggeduserandwhetherthecurrentloggeduseristheadministrator.Nootherdatarequiredbythepageisincluded.Therefore,let'smodifythelogic.Aftersuccessfullogin,redirecttoonecontrollerroutefirst,thenreadthedatainthecontroller,andredirecttotheadministratorpagewiththedata.BackgroundAdministrationPageCreateacontrollerinaterminal:BackgroundAdministrationPageCreateanindexmethod:BackgroundAdministrationPageInthe2ndline,eachcontentofthedatatablecanbeobtainedthroughtheall()methodofUserModel,andcanbeoutputtedinadescendingIDorderwiththesortDesc()method.Thesessionaftersuccessfulloginisreadinthe3rdand4thlines.Inthe5thlineisusedforredirectingtotheadministratorpage,withalldatacarried.UserModeliscreatedatthetimeofloginfordeterminingiftheusernameandpasswordarecorrect.Now,thebackgroundAdministrationpageneedstooutputallmemberinformation.Asthesamesheetisused,wedonotneedtocreateanewmodel,butdirectlyusethemodelcreatedbefore.BackgroundAdministrationPageLet'screatearouteviathemethod.Withtheroute,wecannormallyredirecttotheadministratorroutepage.Next,let'soutputdata.Whentherouteredirects,wegetaparameter$allUser,atwo-dimensionaldatawithallmemberinformation.Inthebladetemplateengine,thereisadedicatedmethodforcircularlyoutputtingarraydata.Pleasemodifytheadmin.blade.phpfilebyreferringtocodesbelow:BackgroundAdministrationPageBackgroundAdministrationPageWecansheetthat,{{$loop->iteration}}isfilledinthe"SerialNo."column.Relatedusagesalsoinclude:BackgroundAdministrationPageAtthistime,wecanviewtheadministratorpage,asshowninthepicturebelow:BackgroundAdministrationPageAswehavemodifiedtheaccessmethodofthebackgroundAdministrationpage,theoriginallydefinedadmin/index,theroutewithparameters,cannotbeusedforaccessing.Modifythelinkto"BackgroundAdministration"pageinthenav.blade.phpfile:Inaddition,weusedtodeterminetheloginstatusinthemiddleware.Now,aswehaveenabledanewroute,weneedtomigratetheoriginalroutemiddleware:BackgroundAdministrationPageInthisway,whenweredirecttothe"/admin"route,whethertheloggeduserisanadministratorwillbeautomaticallychecked.Ifno,thelogininterfaceautomaticallydisplays.Ofcourse,wealsocanusethePHPcode,andreadsessiontodeterminetheadministratorpermissiononthepage:SummaryConsideringpermissionissue,onthebackgroundAdministrationpage,wehaveintroduceda"m