ASP网站制作之jsp强于asp,但不是asp.net
因为ASP脚本语言非常简单，因此其代码也简单易懂，结合HTML代码，可快速地完成网站的应用程序。还无法完全实现一些企业级的功能：完全的集群、负载均横。ByCoreyRoth,SeniorWebDeveloperSpecialtoZDNet
Forawhile,theJava2EnterpriseEdition(J2EE)architecturelookedlikethebestwaytodevelopmulti-tieredapplications.JavaServerPages(JSP)andservletshadmanyadvantagesovertheActiveServerPages(ASP)andComponentObjectModel(COM+)platforms.However,IthinkthatisabouttochangewithMicrosoft.Netonthehorizon.Microsoft.Netisprovidingasimilarplatformbutwithmorefunctionality,anditquitepossiblycouldhavethefoundationforbeingcross-platformatsomestage.AccordingtoSun,JSPisbetterthanASPforthefollowingreasons:Ithasplatformandserverindependence,ithasextensibleJSPtagsandASPisinterpreted.Luckily,ASP.Netchangesallofthis.
ThebiggestargumentwhyJavaissuperioristhatitisacross-platformenvironment.Havingcross-platformisgreat,butatwhatcost?Javaisslowbydesign.WithJava,everytimeyourunyourprogramitgoesthroughtheJavaVirtualMachine,aninterpreter,whichthenconvertstheJavabytecodestonativecode.MicrosoftmayenduphavingsupportforplatformindependencewiththewayprogramsarecompiledwithMicrosoft.Net.
Whenaprogramiscompiledwith.Net,itiscompiledintoaDLLorEXEinMicrosoftIntermediateLanguage(MSIL)format,aprocessorindependentassemblylanguage.MSILdoesnotcontainanydependenciesonanyparticularoperatingsystemorarchitecture.ThefirsttimethisEXEisexecuted,itusesJustInTime(JIT)compilationtoconverttheMSILintonativecode.Sothefirsttimeyourunit,itmaybeslower,butsubsequentexecutionswillbefaster.Asyoucansee,thishasthepotentialforadaptationtoacross-platformsituation,butMicrosofthasntmadeanypromisesofthatyet.
Now,IdontknowifMicrosoftwilleveractuallyconvert.Nettoworkonotherplatforms,buttheyareputtingthesupportinthereforit.Myresponsetocross-platformis:Whocares?ForJava,allthatmeansisthatitworkson50differenttypesofUnix.AsfarasIamconcerned,theIntelplatformistheonlyonethatisworthbotheringwith.DesignwiseitmaybeinferiortotheSparcorAlpha,buttheIntelplatformistheonlyoneMicrosoftdevelopsfor.
Oftagsandscripts
ASP3.0doesnothaveextensibletags,anadvantagethatJSPhasheldoverASPforquitesometime.NowwithASP.Net,extensibletagsareavailable.ThroughtheuseofWebForms,ASP.Netisabletododatabinding,formvalidationandmorewithoutthedeveloperhavingtowriteanyscriptatall.DevelopersevenhavetheabilitytowritetheirowncustomWebFormcontrolstosuittheirownneeds.
AnotherprobleminthepastwithASPwasthatitwasaninterpretedlanguage,whereasJSPpagesarecompiledintoservletsthefirsttimetheJSPpageisaccessed.WhatSunneglectstomentionisthattheservletisstillinterpretedwiththeJavaVirtualMachine.WithASP.Net,pageswillnowbeprecompiledtoMSILandthenuseJITcompiling,justlikeJSP.Thedifferenceis.Netgetscompiledonceintonativecode,andservletsareinterpretedeverytimetheyareexecuted.Inthelongrun,Ithinkthiswillresultin.Netcodebeingmoreefficient.
Microsofts.Netmaynotbeperfect.Sinceitstillisinbeta,itmaychangequiteabitbeforeitisactuallyreleased.However,Ithinkitisagreatalternativetowhatwehadbefore.Inthepast,usingCOMandtheMicrosoftTransactionServer(MTS)wasanightmarefordevelopersandusingJ2EEwasslowerthandeath.Iadmitforalongtime,theJ2EEplatformwassuperiortoASPandCOM+.With.Netcomingsoon,Sunshouldbelookingfornewwaystoimproveitsplatformandremaincompetitive.Otherwise,itmaybelosingfuturedevelopers.
CoreyRothisaSeniorWebDeveloperforWordSpinners,aTulsa,OK-basedWebdevelopmentcompany.HehasfiveyearsofexperienceindevelopingWebsites,andstartedhisWebdevelopmentcareeratCreativeLabs.CoreyisalsoconsideredalocalexpertinMicrosofttechnologies,includingActiveServerPages,COM+andMicrosoftSiteServer.
Disclaimer:YourTurnisacommentarycolumnwrittenbyaZDNetNewsreader.Theopinionsexpressedhereinarethoseoftheauthor,notthoseofZDNet,ZDNetNewsnoritseditors.
强大的可扩展性。ASP具有强大的扩展性，可以实现与多种网络、硬件设备的连接：通过专用的通讯线路远程接入企业；通过远程拨号服务器为远程拨号客户提供服务；通过WAP为移动电话互联网客户服务。 我们必须明确一个大方向，不要只是停留在因为学而去学,我们应有方向应有目标. 你可以通过继承已有的对象最大限度保护你以前的投资。并且C#和C++、Java一样提供了完善的调试/纠错体系。 掌握asp的特性而且一定要知道为什么。 另外因为asp需要使用组件，所以了解一点组件的知识(ADODB也是组件) 你可以通过继承已有的对象最大限度保护你以前的投资。并且C#和C++、Java一样提供了完善的调试/纠错体系。 另外因为asp需要使用组件，所以了解一点组件的知识(ADODB也是组件) 代码逻辑混乱，难于管理：由于ASP是脚本语言混合html编程，所以你很难看清代码的逻辑关系，并且随着程序的复杂性增加，使得代码的管理十分困难，甚至超出一个程序员所能达到的管理能力，从而造成出错或这样那样的问题。 学习是为了用的，是为了让你的程序产生价值，把握住这个原则会比较轻松点。除此之外，课外时间一定要多参加一些社会实践活动，来锻炼自己的能力。
页:
[1]