軟件開發(fā)畢業(yè)設計—英文論文

1、StrutsanopensourceMVCimplementationIntroductionKidsingradeschoolputHTMLpagesontheInter.HoweverthereisamonumentaldifferencebetweenagradeschoolpageaprofessionallydevelopedWebsite.Thepagedesigner(HTMLdeveloper)mustunderstco

2、lsthecustomerproductflowpagelayoutbrowsercompatibilityimagecreationJavriptme.PuttingagreatlookingsitetogethertakesalotofwkmostJavadevelopersaremeinterestedincreatingagreatlookingobjectinterfacethanauserinterface.JavaServ

3、erPages(JSP)technologyprovidesthegluebetweenthepagedesignertheJavadeveloper.IfyouhavewkedonalargescaleWebapplicationyouunderstthetermchange.ModelViewController(MVC)isadesignpatternputtogethertohelpcontrolchange.MVCdecoup

4、lesinterfacefrombusinesslogicdata.StrutsisanMVCimplementationthatusesServlets2.2JSP1.1tagsfromtheJ2EEspecificationsaspartoftheimplementation.YoumayneverimplementasystemwithStrutsbutlookingatStrutsmaygiveyousomeideasonyou

5、rfutureServletsJSPimplementations.InthisarticleIwillbeginwithaJSPfilethatuseselementsyoumaybefamiliarwithdiscusstheprosconsofsuchapage.IwillthencoverStrutshowitcancontrolchangeinyourWebprojectpromotespecialization.Finall

6、yIwillredevelopthesimpleJSPfilewiththepagedesignerchangeinmind.AJSPfileisaJavaservletAJavaServerPage(JSP)fileisnothingmethananotherwaytoviewaservlet.TheconceptofaJSPfileistoallowustoseeaJavaservletasanHTMLpage.Thisviewel

7、iminatesalloftheuglyprint()statementsthatnmallyshowupinJavacode.TheJSPfileispreprocessedintoa.javafilethencompiledintoa.class.IfyouareusingTomcatyoucanviewyourpreprocessed.javafilesinthewkdirecty.Othercontainersmaystethe

8、.java.classfileselsewherethelocationiscontainerspecific.Figure1demonstratestheJSPfiletoservletflow.Figure1.JSPfiletoservletflowerr=email“isnotavalidemailaddresspleasetryagain.“elseemail=““%JoinMailingListEnteryouremailto

9、jointhegroupFigure2.InasimplerequestresponsetheJSPfilesetsthedatacontrolstheflowtothenextpagecreatestheHTMLThemailinglistJSPfileisaselfcontaineddoitallmodule.TheonlythingsnotcontainedintheJSPfilearetheactualcodefvalidati

10、onthatiscontainedinisValidEmail()thecodethatputstheemailaddressinthedatabase.(SeparatingtheisValidEmail()methodintoreusablecodemightseemlikeanobviousthingtodobutIhaveseenthecodefisValidEmail()embeddeddirectlyintothepage.

11、)Theadvantageofthesinglepageapproachisthatitiseasytounderstinitiallyeasytobuild.Inadditionwithallthegraphicaldevelopmenttoolsitiseasytogetstarted.Activitiesofjoin.jsp1.Displayopeninginputpage.2.Readtheemailvaluefromthefm