how tomcat works.pdf

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1、IntroductionOverviewWelcometoHowTomcatWorks.ThisbookdissectsTomcat4.1.12and5.0.18andexplainstheinternalworkingsofitsfree,opensource,andmostpopularservletcontainercode-namedCatalina.Tomcatisacomplexsystem,consistingofmanydifferentcomponents.Thosewhowant

2、tolearnhowTomcatworksoftendoknowwheretostart.Whatthisbookdoesisprovidethebigpictureandthenbuildasimplerversionofeachcomponenttomakeunderstandingthatcomponenteasier.Onlyafterthatwilltherealcomponentbeexplained.YoushouldstartbyreadingthisIntroductionasit

3、explainsthestructureofthebookandgivesyouthebriefoutlineoftheapplicationsbuilt.Thesection"PreparingthePrerequisiteSoftware"givesyouinstructionsonwhatsoftwareyouneedtodownload,howtomakeadirectorystructureforyourcode,etc.WhoThisBookIsforThisbookisforanyon

4、eworkingwiththeJavatechnology.Thisbookisforyouifyouareaservlet/JSPprogrammeroraTomcatuserandyouareinterestedinknowinghowaservletcontainerworks.ItisforyouifyouwanttojointheTomcatdevelopmentteambecauseyouneedtofirstlearnhowtheexistingcodeworks.Ifyouha

5、veneverbeeninvolvedinwebdevelopmentbutyouhaveinterestinsoftwaredevelopmentingeneral,thenyoucanlearnfromthisbookhowalargeapplicationsuchasTomcatwasdesignedanddeveloped.IfyouneedtoconfigureandcustomizeTomcat,youshouldreadthisbook.Tounderstandthediscussi

6、oninthisbook,youneedtounderstandobject-orientedprogramminginJavaaswellasservletprogramming.Ifyouarenotfamiliarwiththelatter,thereareaplethoraofbooksonsendets,includingBudi'sJavafortheWebwithServlets,JSP,andEJB.Tomakethematerialeasiertounderstand,eachch

7、apterstartswithbackgroundinformationthatwillberequiredtounderstandthetopicindiscussion.HowAServletContainerWorksAservletcontainerisacomplexsystem.However,basicallytherearethreethingsthataservletcontainerdoestoservicearequestforaservlet:Creatingareques

8、tobjectandpopulateitwithinformationthatmaybeusedbytheinvokedservlet,suchasparameters,headers,cookies,querystring,URI,etc.Arequestobjectisaninstanceofthejavax.servlet.ServletRequestinterfaceorthejavax.servlet.http.ServletRequestinterface