50 Task 5 Controller in LaravelPHP动态网站开发项目教程课件

Project3OverwritetheMemberAdministrationSystemwiththePHPFrameworkLaravelTask5ControllerinLaravelSchoolofSoftware,ChengduPolytechnicLecturer:MuQichunViewandRouteinLaravelNow,let'suseLaraveltorewritethememberadministrationsystemwehavefinished.Findthecompletedmemberadministrationsystem.Copysomecodesforfurtheruse.ViewandRouteinLaravel1.CreatingaviewAtfirst,let'srewritethehomepage.Openindex.php.Thehomepagemainlyincludesonenav.phpfile.Then,copynav.phptoaview,andrenameitasnav.blade.php.Copyindex.phptotheview,andrenameitasindex.blade.php.Opentheindex.blade.phpfile,andmodifytheoriginalinclude_oncefileas:ControllerinLaravelControllerismainlyusedtoprocessHTTPrequestsforwardedbyaspecificURL,andthenconductservicelogicprocessingtoreturntheresultstoaspecificobject.TheLaravelframeworkprovidesuswithcommandstocreatecontrollers.Wecancreateacontrollerbyenteringthefollowingcommandonthecommandlinewheretheprojectdirectoryislocated:ThecontrolleriscreatedintheControllersdirectorybydefault.Ifacontrollerisrequiredtobecreatedunderasubdirectory,weonlyneedtoaddasubdirectoryname:ControllerinLaravelArtisan,aCLI(commandlineinterface)providedbyLaravel,providesmanypracticalcommandstohelpusdevelopLaravelapplications.Forexample,afterinstallingLaravelearlier,weusedtheartisantooltolaunchtheapplicationbyusingPHP'sbuilt-indevelopmentserver.Ok,now,let'sgetbacktoourmemberadministrationproject.Takingmemberloginasanexample,Iwillbriefwithyouhowtousethecontroller.First,copythelogin.phpfiletotheviewfolderunder"resources"andrenameitaslogin.blade.php.Openthelogin.blade.phpfileandreusethe@includedirectivetoincludethenav.blade.phpfile.Deletethecontentofsession_startinthefileheader.ControllerinLaravelControllerinLaravelCreatethefollowingroutesintheroutefileweb.php:Toaccess"/login",justreturntotheviewlogin.Now,wecanopenthe:8000/loginforviewingtheresults.Therearealsosomestaticfiles,suchasimagesincludedinthisfile.Next,pleasecopytheimgdirectoryto"public",thenmodifytheimagepathbyadding"/"infront.Ofcourse,wecanalsousetheauxiliaryfunctionasset:ControllerinLaravelWecanseethatthecaptchastillcannotbedisplayed.Todisplaycaptcha,wealsoneedtoaddaroute.First,copythecode.phpfileintotheview,modifyittocode.blade.php,andthenaddthefollowingcontenttoweb.php:Then,thecodeofcaptchaimageinlogin.blade.phpneedstobechanged:ControllerinLaravelHerewecanseethatsrcofimgtaghasbeenchangedto{{url('/code')}}.Asabladetemplatesyntax,{{}}isusedtodisplaythecontentsofvariables.AsanauxiliaryfunctioninLaravel,urlisusedtogenerateanurlpath.Now,wecanrefresh:8000/logintoseethenormallogininterface.ControllerinLaravelTorealizeloginfunction,weneedtocreateacontroller.InCMD,thefollowingcommandphpArtisanmake:controllerLoginControllerwasenteredtocreateacontroller,whichcanbelocatedunderapp/Http/Controllers.Thecontrollershallbenamedafteralargehump.Inthecontroller,addamethodlogin():ControllerinLaravelWecanseethattheparametersofthemethodloginspecifyaclassRequestandavariable$request.Thismethodiscalledmethodinjection(dependencyinjection)andthisspecifiedvariablewillcontaininstancesofthespecifiedclass.Thegreatthingaboutmethodinjectionisthatitcansimplifythecode.Takingtheabovecodeasanexample,ifmethodinjectionisnotused,thefollowingcodeneedstobewritten:InLaravel,dd()isapartoftheLaravelauxiliaryfunction.Theddfunctionisusedtooutputthegivenvalueandendthescriptrun.ItcanprintallvariablesintheLaravel,withthesyntaxof"dd($value1,$value2...)".ControllerinLaravelControllerinLaravelToachieveformsubmission,arouteneedstobecreatednext:AfterenteringtheabovecodeinPhpStorm,wecanseeUndefinedclass'LoginController'promptedinthesystem.TheLoginControllerclasscanbefoundandwillbeautomaticallyreferencedbyonlyclickingtheimportclasslinkbelowtheprompt.Atthispoint,thefollowinglineofcodewillbeautomaticallyaddedtoweb.php:ControllerinLaravelWeshouldnoticethatwehaveusedpostmethod.Topreventcrosssiteattacks,LaravelrequiresthatahiddenCSRFtokenfieldmustbeaddedtotheformforallsubmissionusingPOST.Itcanbe{{csrf_field()}}or@csrf.Examples,asshowninthefollowingcontents:ControllerinLaravelNext,let'smodifytherelevantcontentoftheform:Nowwecantesttheloginfunctionfromwherewecancheckthevariousdatafilledintheregistrationpageinthebrowser.Amongthem,thetokenfieldisregardedasatokenautomaticallygeneratedbythesystemtopreventcrosssiteattacks.SummaryThecontrollerinLaravelismainlydesignedtoprocessHTTPrequestsforwardedbyaspecificURL,andthenperformbusinesslogicprocessingtoreturntheresultstoaspecificobject.Controltheacquisitionofrequesteddataandtheresponseofresults;Makelogicaljudgments;Commandallpartsoft