【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11.docx

【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11.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。

）

JavaWebStartandApplets

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.AllHTMLfilesbeginwithantagandendwith.MostHTMLtagsareterminatedlikethis,usingaforwardslashfollowedbythetagname.ThisisaverysimpleHTMLfile,showingadditionaltagsforthepageheader（,whichcanincludeatitle