Java语言程序设计与数据结构 基础篇原书第11版PPT及其他教辅资源38slide.ppt

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1、1Chapter38JavaServerPage2ObjectivesTocreateasimpleJSPpage(§38.2).ToexplainhowaJSPpageisprocessed(§38.3).TouseJSPconstructstocodeJSPscript(§38.4).TousepredefinedvariablesanddirectivesinJSP(§§38.5-38.6).TouseJavaBeanscomponentsinJSP(§38.7-38.9).TodevelopdatabaseapplicationsusingJSP(§38.7-38.9

2、).ToforwardrequestsfromaJSPpagetoanother(§38.10).3ASimpleJSPCurrenttimeis<%=newjava.util.Date()%>Run4HowIsaJSPProcessed?5JSPConstructsTherearethreetypesofscriptingconstructsyoucanusetoinsertJavacodeintoth

3、eresultantservlet.Theyareexpressions,scriptlets,anddeclarations.expressionscriptletdeclarationAJSPexpressionisusedtoinsertaJavaexpressiondirectlyintotheoutput.Ithasthefollowingform:<%=Java-expression%>Theexpressionisevaluated,convertedintoastring,andsenttotheoutputstreamoftheservlet.6JSPCon

4、structsTherearethreetypesofscriptingconstructsyoucanusetoinsertJavacodeintotheresultantservlet.Theyareexpressions,scriptlets,anddeclarations.expressionscriptletdeclarationAJSPscriptletenablesyoutoinsertaJavastatementintotheservlet’sjspServicemethod,whichisinvokedbytheservicemethod.AJSPscrip

5、tlethasthefollowingform:<%Javastatement%>7JSPConstructsTherearethreetypesofscriptingconstructsyoucanusetoinsertJavacodeintotheresultantservlet.Theyareexpressions,scriptlets,anddeclarations.expressionscriptletdeclarationAJSPdeclarationisfordeclaringmethodsorfieldsintotheservlet.Ithasthefollo

6、wingform:<%!Javamethodorfielddeclaration%>8JSPCommentHTMLcommentshavethefollowingform:Ifyoudon’twantthecommentappearintheresultantHTMLfile,usethefollowingcommentinJSP:<%--JSPComment--%>9Listing38.1ComputingFactorials<%for(in

7、ti=0;i<=10;i++){%>Factorialof<%=i%>is<%=computeFactorial(i)%>
<%}%><%!privatelongcomputeFactorial(intn){if(n==0)return1;elsereturnn*computeFactorial(n-1);}%>JSPscriptletJSPexpressionJSPdeclarationRun10JSPPredefinedVariablesYoucanusevari