【精品文档】433关于计算机专业网页小程序有关的外文文献翻译成品:JavaWebStart和小应用程序Applets中英文双语对照11Word文档下载推荐.docx
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【精品文档】433关于计算机专业网页小程序有关的外文文献翻译成品:JavaWebStart和小应用程序Applets中英文双语对照11Word文档下载推荐.docx
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外文标题:
JavaWebStartandApplets
外文作者:
DavidParsons
文献出处:
FoundationalJava,2019,pp503-527(如觉得年份太老,可改为近2年,毕竟很多毕业生都这样做)
英文3584单词,19270字符(字符就是印刷符),中文5622汉字。
(如果字数多了,可自行删减,大多数学校都是要求选取外文的一部分内容进行翻译的。
)
Initsearlydays,JavacametoprominencebecauseofJavaapplets,runninginwebbrowsers.Appletshavehadsomethingofacheckeredhistorysincethen,andmostJavawebtechnologiesbelongintheenterpriseeditionratherthanthestandardeditionofJava.However,appletsarestillwidelyused,andcanbeausefulcomponentofrichInternetapplications.Alsoassociatedwiththeweb,butlessdirectly,isJavaWebStart,whichallowsdesktopapplicationstobedeployedovertheweb.Inthischapter,wewillbeginbylookingatJavaWebStartandthenlookatapplets,whichcannowusethesamedeploymentmechanismasJavaWebStart,makingitveryeasytoswitchbetweenthetwomodesofdeployment.SincebothJavaWebStartandappletsrequireustocreatewebpageswithappropriatelinkstoJavaapplicationsorapplets,wewillbeginwithbriefoverviewsofwebbrowsers,URLs,andHTML.
20.1WebBrowsers,URLs,andHTMLPages
Webbrowsersoftware(e.g.,Explorer,Firefox,Safari,Chrome,etc.)isdesignedtoretrieveinformationfromremotesitesontheWorldWideWeb(WWW)usingUniformResourceLocators(URLs).MuchoftheinformationismadeavailableintheformofHTML(HyperTextMarkupLanguage)webpages.
20.1.1URLs
AURLisbasicallytheInternetaddressofaresourceonaparticularserver,andtypicallyiswritteninthreeparts:
theprotocol,theserveraddress,andthenameoftheresource(includinganypathinformation).
20.1.1.1TheHTTPProtocol
Theprotocolprefixforwebpagesis“http:
//”.Thisstandsfor“hypertexttransferprotocol”andmostURLsstartthisway.Indeedthispartisoftenomitted,becauseitisusuallythebrowser’sdefaultprotocol(thoughthereareotherwebprotocolsthatyoumaybefamiliarwithsuchasFTP,theFileTransferProtocol).
20.1.1.2TheServerAddress
Theserveraddressusuallybeginswith“www”(WorldWideWeb),followedbythenameofthesiteandits“domain,”whichdefinesitscategoryandmayincludeitscountrycode.Eachoftheseisseparatedbyaperiod(fullstop).Take,forexample,thefollowingURL:
“introjava”isthenameoftheserversiteand“com”meansacompany.Commonalternativesto“com”are“edu”foracademicinstitutionsand“org”fororganizations.ManyURLsarewithinacountrydomain,suchas“.co.uk”or“.ac.nz”.Ifyouarerunningatestserveronyourlocalmachine,thedomainnamebecomes“localhost.”
20.1.1.3ThePathandResourceName
ThefinalpartofaURLcanincludethelocation(directory)andnameoftheparticularfileatthesite.Forexample,
Thislooksforthefile“getinvolved.html”inthe“foundation”directory.Thefilenamewillgenerallyendin“html”(orsometimesjust“htm”)becauseitwillusuallybeafilewritteninHTML(seebelow).Ifnofilenameisspecified,“index.html”isoftentheserver’sdefaultfilenamethatitwillsendbacktothebrowser.Ifnoindexfileispresent,thenadirectorylistingmaybedisplayedinstead,oranerrorpage,dependingontheserver’sconfiguration.
20.1.2HTML(HyperTextMarkupLanguage)
WebbrowsersdisplayscreensofinformationwrittenusingHTML(HyperTextMarkupLanguage).ThebrowsertakesthebasicinformationstoredintheHTMLfileandformatsitappropriatelyusingtagsembeddedintothetextofthefile.AllHTMLfilesbeginwithan<
html>
tagandendwith<
/html>
.MostHTMLtagsareterminatedlikethis,usingaforwardslashfollowedbythetagname.ThisisaverysimpleHTMLfile,showingadditionaltagsforthepageheader(<
head>
whichcanincludeatitle<
title>
),themainbodyofthetext(<
body>
),andsometext.Headertags(suchas<
h1>
)canbeusedtoformatthesizeoftext.The<
p>
tagisusedtospecifyparagraphs.The“DOCTYPE”atthetopthefilespecifiestheversionofHTMLthatisbeingused.ThisexampleusesHTML5(differentDOCTYPEShavedifferentexpectationsabouthowthedocumentshouldbestructured).
Figure20.1showswhatthispagelookslikewhenloadedintoabrowserasalocalfile.Simplefilescaneasilybewrittenbyhand,butformorecomplexpagesitisbettertouseoneofthemanyavailableHTMLeditingtools.SomesimpleHTMLpageswillbeneededtolaunchtheapplicationsandappletsdescribedinthischapter.
20.2JavaWebStart
JavaWebStartisagenericRichInternetApplication(RIA)launchmechanismthatcanbeusedtodeploybothdesktopapplicationsandapplets.Itprovidesawaytoeasilydeployapplicationsviatheweb,andprovidesanalternativetosomeothertypesofwebdeployment,suchassomeserversidewebapplications,thoughitprimarilyeasesthed
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