外文翻译--Active Server Pages tutorial for beginners 原文.doc

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外文翻译--Active Server Pages tutorial for beginners 原文.doc

1【原文】http:/www.asptutorial.infoTutorialHomePageSessionandApplicationMethodInthispagewewilllearnhowtokeepinformationfromtheuserinourserver(Sessionmethod)andhowtoshareinformationbetweenusers(Applicationmethod).Thisisonlyabasictutorialforbeginners,soonlybasicfeatureswillbedescribed.TheSessionmethodThefirsttimeauseraccessestoaourpagessomeconnectionsanddisconnectionstookplace.Duringthisprocesstheserverandtheclientwillinterchangeinformationtoidentifyeachother.Duetothisexchangeofinformationourserverwillbeabletoidentifyaspecificuserandthisinformationmaybeusetoassignspecificinformationtoeachspecificclient.Thisrelationshipbetweencomputersiscallasession.Duringthetimeasessionisactive,itispossibletoassigninformationtoaspecificclientbyusingSessionmethod.Wewilluseanexampletoexplainthismethod:Letssupposewewanttoallowspecificusertoaccesstheinformationonoursiteordirectoryandwewanttoshowausernameinallpagesvisitedbytheuser.InthiscasewemayusetheSessionmethod.Inthisexample,wewillasktheusernameofthepersoninourindex.asppagerespondtoforms.asp<%IFRequest.form=""THEN%><html><title>Ourprivatepages</title><body>Inordertoaccessthispagesfilltheformbelow: <formmethod="post"action="index.asp">Username:<inputtype="text"name="username"size="20"> Password:<inputtype="password"name="password"size="15"> <inputtype="Submit"value="Submit"></form></body></html><%ELSE%><%IFRequest.form("username")="Joe"ANDRequest.form("password")="please"THEN%>1234567891011121314151617182<%Session("permission")="YES"Session("username")="Joe"%><html><title>Ourprivatepages</title><body>Hi<%=Session("username")%>,youareallowtoseethesepages: <AHREF="page1.asp">Page1</A> <AHREF="page2.asp">Page2</A></body></html><%ELSE%>Errorinusernameorpassword<%ENDIF%><%ENDIF%>192021222324252627282930313233343536373839404142Letsexplainhowthispageworks:Inline1itischeckedwhetherinformationissubmittedthrowaform.Iftheanswerisnegative(Request.form=""),aformisdisplayedaskingforusernameandpassword.Afterfillingtheformandsubmittingit,asRequest.formisnot""andthescriptwilljumptoline15.Inline17theyarecheckedtheusernameandpassword.Ifusernameis"Joe"andPasswordis"please",thentwovariablesaresetfortheclient(lines21-22):Session("permission")="YES"Session("username")="Joe"Thesevariableswillbekeptintheserverduringthetimethesessionisactive(normallyitwillexpireafter20minuteswithoutcontact).Finally,ifusernameandpasswordarecorrect,aresponsepagewithlinksissendtotheclientwiththenameoftheuserinthetop.Inthisexample,iftheusernameorpasswordareincorrecttheresponsepagewillincludethetextinline38.3Now,letssupposetheuserclicksinthelink"Page1"(page1.asp).Thecodeofpage1.aspwillbethefollowingone:page1.asp<%IFSession("permission")="YES"THEN%><html><title>Page1</title><body>Hi<%=Session("username")%>,welcometoPage1 Thispageisemptyatthemoment,butitwillbeveryinterestinginthenextfuture</body></html><%ELSE%>Youarenotallowedtoaccessthispage<%endIF%>1234567891011121314151617Inline1itischeckwhetherthevalueforSession("permission")is"YES".Iftheanswerispositiveapagewithinformationissendtotheclient.Iftheanswerisnegative,thetextinline15issend.NOTES:Sessionmethodissuitableforsiteswithalimitednumberofvisitors.Forsiteswithabiggernumberofvisitorsitispreferabletokeeptheinformationintheclientscomputer(byusingcookies).TocreatemorevariablesassociatedtoaspecificclientwemustsubstitutethetextbetweenbracketsinSession("text").Thecorrespondingsecurityfeaturesintheclientsbrowsermustbeenable.TheApplicationmethodWithSessionmethodwehavedefinedavalueforSession("whatever")="Joe",butthisinformationcannotbesharebetweenvisitors(Session("whatever")hasauniquevalueforeachvisitor).ToallowsharinginformationApplicationmethodisused.Forabetterunderstandingofthismethodwewillcreateacounterwhichwillbeshowninthesamepage.Inordertomakeitwork,copythecodebelowtoyourserver:counter.asp4<%Aplication.LockApplication("pagevisits")=Application("pagevisits")+1Application.Unlock%><html><title>Pageunderconstruction</title><body>Underconstruction Pageviews:<%=Application("pagevisits")%></body></html>123456789101112131415Inthefirstpartofthiscode,asApplicationmethodissharedbetweendifferentclients,itisnecessarytopreventotherclientsfrommodifyingtheinformationinApplication("pagevisits").Application.Lockwillavoidthatbystoppingtheinformationtobeshared,andApplication.Unlockwillallowtheinformationtobesharedagain.Line3increasesthevalueforthecounter.Finallyahtmlcodeissendtotheclient,includingthevalueofthecounter.NOTES:TheinformationsaveasApplication("whatever")asshowninthistutorialislosteachtimetheserverisrestarted.SessionandApplicationmethodhasbeenusedtocreateasimplechatscript(copyandpastethecodetoyoursiteanditwillworkimmediately.

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