web程序设计_basic

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1、课程内容绪论客户端技术HTMLCSSJavaScript服务器技术CGI和PHPASPJavaservlet，JSPB/S体系结构主机模式:allcomputationtakeplaceinthemaincomputer,usingdummyterminalC/S架构（Client/Server）mostcomputationtakeplaceintheserver,clientisacomputercarryingpartcomputationB/S架构（Browser/Server）thinclient,limitedabilityofclient,usingWebbrowserB/S结构

2、的优点维护方便，能够降低总体拥有成本。B/S比C/S的维护工作量大大减少了B/S相对C/S能够降低总体拥有成本选择更多移动办公系统整合WorldWideWeb(WWW)CoreComponentsServersStorefilesandexecuteremotecommandsBrowsers(i.e.,clients)Retrieveanddisplay“pages”ofcontentlinkedbyhypertextNetworksSendinformationbackandforthuponrequestProblemsHowtoidentifyanobjectHowtoretrieve

3、anobjectHowtointerpretanobjectWWW的主要技术URI(UniformResourceIdentifier)protocol://hostname:port/directory/objecthttp://www.cs.iastate.edu/index.htmlftp://popeye.cs.iastate.edu/welcome.txthttps://finance.yahoo.com/q/cq?s=ibm&d=v1Implementation:extendhierarchicalnamespacetoincludeanythinginafilesystemser

4、versideprocessingHTTP(HyperTextTransferProtocol)Anapplicationprotocolforinformationsending/receivingHTML(HypertextMarkupLanguage)AnlanguagespecificationusedtointerprettheinformationreceivingfromserverHTTP特性Request-responseexchangeServerrunsoverTCP,Port80ClientsendsHTTPrequestsandgetsresponsesfromser

5、verSynchronousrequest/replyprotocolStatelessNostateismaintainedbyclientsorserversacrossrequestsandresponsesEachpairofrequestandresponseistreatedasanindependentmessageexchangeResourcemetadataInformationaboutresourcesareoftenincludedinwebtransfersandcanbeusedinseveralwaysGETTransferresourcefromgivenUR

6、LHEADGetresourcemetadata(headers)onlyPUTStore/modifyresourceunderagivenURLDELETERemoveresourcePOSTProvideinputforaprocessidentifiedbythegivenURL(usuallyusedtopostCGIparameters)HTTP命令TheclientContactitslocalDNStofindouttheIPaddressofwww.cs.iastate.eduInitiateaTCPconnectiononport80Sendthegetrequestvia

7、theestablishedsocketGET/index.htmlHTTP/1.0TheserverSenditsresponsecontainingtherequiredfileTellTCPtoterminateconnectionThebrowserParsethefileanddisplayitaccordinglyRepeatthesamestepsinthepresenceofany