tsaretagsthatencapsulatelogicthatisrecognizedbytheJSP.YoucaneasilypickoutscriptingelementsonJSPpagesbylookingforcodethatbeginswith<%andendswith%>.TobeseenasaJSPpage,thefilejustneedstobesavedwithanextensionof.jsp.WhenaclientrequeststheJSPpage,pilesthesourceintoaJavaclassfile—justasyouwoulddoifyouwerewritingaservletfromscratch.Atruntime,thecontainercanalsocheckthelastmodifieddateoftheJSPfileagainsttheclassfile.piled,thecontainerwillretranslateandrebuildthepagealloveragain.ProjectmanagerscannowassignthepresentationlayertoHTMLdevelopers,pletethebusiness-logicportion.TheimportantthingtorememberisthataJSPpageisreallyjustaservlet.Anythingyoucandowithaservlet,youcandowithaJSP.7.JavaBeans:ponents.ponentwritteninJava.ToqualifyasaJavaBean,theclassmustbeconcreteandpublic,andhaveanoargumentconstructor.
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