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WebDevelopment Whatexactlydoeswebdevelopmentdo?Itmainlyinvolvesthefollowingaspects: Front-enddevelopment Responsiblefordevelopingtheuserinterfaceandinteractivepartsofthewebsite, including technologiessuchasHTML,CSSandJavaScript. Back-end development Responsibleforprocessingthedataandbusinesslogicofthewebsite,includingdeveloping web applicationsusingserver-side languages(suchasPHP,Python,Java,etc.)andusingdatabasestostoredata. Databasemanagement Responsible fordesigningcreatingandmaintainingthedatabaseofwebapplicationstoensure datasecurityreliabilityandefficiency. Webservermanagement Responsible forinstalling,configuringandmaintainingwebserversoftwaretoensurethat web applicationscan run properly. Theultimategoalofwebdevelopmentistocreateacompleteandpowerfulwebapplicationto meetuserneedsandimprovebusinessefficiency. Whatdoeswebdevelopmenttechnologyinclude?
Webdevelopmenttechnologiesincludemanytypes.Thefollowingaresomecommonlyused Webdevelopmenttechnologies. HTML/CSS HTMListhemarkuplanguageusedtocreatewebpages,andCSSisusedtocontrolthestyle andlayout ofthepage. JavaScript Ascriptinglanguageusedtoaddinteractiveanddynamiceffectstoweb pages. Front-endframework Forexample,React,Angular,andVueareusedtosimplifythefront-enddevelopment process andimprovedevelopmentefficiencyandcodequality. Back-end language Forexample,PHP,Python,Java,Ruby,etc.,areusedtowritetheback-endcodeofweb applications. Database Forexample,MySQL,MongoDB, PostgreSQL,etc.areusedtostoredataforwebapplications. Webserver Forexample,Apache,Nginx,etc.areusedtoprovidewebapplicationservices. APIdesignanddevelopment
Forexample,RESTfulAPI,GraphQL,etc.areusedtoprovideinterfaceservicesforweb applications. Containersanddeploymenttools Forexample,Docker,Kubernetes,etc.,areusedtomanageanddeploywebapplications. Safetytechnology Forexample,SSL,HTTPS,OAuth,etc.areusedtoensurethesecurityofwebapplications. TheabovearejustsomecommonlyusedWebdevelopmenttechnologies.Infact,Webdevelopmenttechnologyisafieldthatisconstantlydeveloping andevolving.New technologies areconstantlyemerging,andoldtechnologiesareconstantlybeingupdatedandoptimized. developmentlanguage ASP ASPistheabbreviationofActiveServerPage.ItisawebpagethatcontainsscriptcodeusingVB ScriptorJscript.WhenabrowserbrowsesanASPwebpage,thewebserverwillgenerate the correspondingHTML(anapplicationunderStandardUniversalMarkupLanguage) code accordingtotherequestandthenreturnittothe browser,sothatwhatthebrowserseesisa dynamicallygeneratedwebpage.ASPisanapplicationdevelopedbyMicrosofttoreplaceCGI scriptprograms.Itcaninteractwithdatabasesandotherprograms.Itisasimple andconvenientprogrammingtool.AfterunderstandingthebasicsyntaxofVBSCRIPT,youonly need toknowthepurpose,properties,andmethodsofeachcomponent,andyoucaneasilywrite yourownASPsystem.TheformatofASPwebpagefiles is.ASP. FSO
FSO(FileSystemObject)isafileoperationcontrolofMicrosoftASP.Thiscontrolcan read, create,modify,anddeletedirectoriesandfilesontheserver.ItisaveryusefulcontrolinASP programming.However,duetopermissioncontrolissues,theFSOofmanyvirtualhostservers hasbecomeanopenbackdooroftheserver,becausecustomerscandirectlyprogram the controlintheirownASPwebpages,thereby controllingtheserverandevendeletingfileson theserver..Therefore,manyvirtualhostingprovidersintheindustryhavesimplyturnedoff thiscontrol,leavingcustomerswithalot lessflexibility. TheW2KvirtualhostserverIwanttoinstallhashighsecurity,allowingcustomers touseit arbitrarilyintheirownwebsitespacewithoutanywaytoharmthesystemorhinderthenormal operationofothercustomers' websites. CGI CGIisastandardthatdefineshowaWebservercommunicateswithexternalprograms, allowingtheexternalprogramtogenerateHTML(anapplicationunderStandardCommon MarkupLanguage),images,orothercontent,andtheserverprocessesitinthesamewayas thosethatarenotexternalprograms.GeneratedHTML,images,orothercontentare handled thesameway.Therefore,CGIprogramsonlyenableyoutogenerateexpressivecontent and notdynamiccontent.ThereasonforusingCGIisthatitisawell-definedandwidelysupported standard.WithoutCGI,it isimpossibletoimplementdynamicWebpages,unlesssomespecial methodsprovidedbytheserverareused(nowadays,thereareothertechnologiesbesidesCGI graduallybecomethestandard). PHP PHPisaserver-side HTML-embedded scriptinglanguage.Itsmost powerfulandimportant featureisitsdatabaseintegrationlayer.Itisincrediblysimpletouseittocompleteawebpage containingdatabasefunctions.InHTMLfiles,PHPscripts(syntaxsimilartoPerlorClanguage) canbe referencedusingspecialPHPtags,sothatwebpageproducersdonothavetorely entirelyonHTML(anapplicationunderStandardUniversalMarkupLanguage)togenerateweb pages.SincePHPisexecutedontheserverside,theclientcannotseethePHPcode.PHPcan completeanytaskthataCGIscriptcancomplete, butitsfunctionalitydependsonits compatibilitywithvariousdatabases.InadditiontousingHTTPforcommunication,PHP can alsouseIMAP,SNMP,NNTP,andPOP3protocols. JSP
JSPtechnologyusestheJavaprogramminglanguagetowriteXML-like(asubsetoftheStandard GeneralMarkupLanguage)tagsandscriptletstoencapsulatetheprocessinglogicforgeneratingdynamicwebpages.Webpagescanalsoaccesstheapplicationlogicofresources thatexistontheserverthroughtagsandscriptlets.JSPseparateswebpagelogicfromwebpagedesignanddisplay,supportsreusablecomponent-baseddesign,andmakesthe developmentofweb-basedapplicationsquickandeasy. WhenthewebserverencountersarequesttoaccessaJSPwebpage,itfirstexecutesthe programsegment,andthenreturnstheexecutionresulttotheclienttogetherwiththeHTML (anapplicationundertheStandardUniversalMarkupLanguage)codeintheJSPfile.The insertedJavaprogramsegmentscanoperatedatabases,redirectwebpages,etc.toachieve the functionsrequiredtocreatedynamicwebpages. SQL SQLisahigh-levelnon-proceduralprogramminglanguageandanimportanttoolfor communicatingbetweendatabaseserversandclients,allowinguserstoworkonhigh-leveldata structures.Itdoesnotrequireuserstospecifythedatastoragemethod,nordoesitrequireuserstounderstandthespecificdatastoragemethod.Therefore,differentdatabasesystems withcompletelydifferentunderlyingstructurescanusethesameSQLlanguageastheinterface fordatainputandmanagement.Itusesrecordcollectionsasoperationobjects.AllSQL statementsacceptcollectionsasinputandreturncollectionsasoutput.Thiscollectionfeature allowstheoutputofoneSQLstatementtobeusedastheinputofanotherSQLstatement,so SQLstatementscanbenested,whichmakesitIthasgreatflexibilityandpowerfulfunctions.In mostcases,functionsthatrequirealargeprograminotherlanguagescanbeachievedwithjust oneSQLstatement.Thisalsomeansthat