2020年新版JAVA外文文献+翻译.docx

Java and the Internet If Java is, in fact, yet another computer programming Ianguage, you may question why it is so important and why it is being promoted as a revolutionary step in computer programming. The answer isn ' t immediately obvious if you coming from a traditional programming perspective. Although Java is very useful for solving traditional stand-alone programming problems, it is also importa nt because it will solve program ming problems on the World Wide Web. Client-side programming The Web' s itial server-browser desig n provided for in teractive content, but the in teractivity was completely provided by the server. The server produced static pages for the client browser, which would simply interpret and display them. Basic HTML contains simple mechanismsfor data gathering: text-entry boxes, check boxes, radio boxes, lists and drop-dow n lists, as well as a butt on that can only be programmed to reset the data on the form or “ submit on the form back to the server. This submissi on passesthrough the Com mon Gateway In terface (CGI) provided on all Web servers. The text within the submissi on tells CGI what to do with it. The most com mon actio n is to run a program located on the server in a directory that ' s typ-caily called you watch the addresswindow at the top of your browser when you push a butt on on a Web page, you can sometimes see “ cgb in ” with in all the gobbledygook there.) These programs can be writte n in most la nguages. Perl is a com mon choice because it is desig ned for text mani pulati on and is in terpreted, so it can be in stalled on any server regardless of processor or operat ing system. Many powerful Web sites today are built strictly on CGI, and you can in fact do nearly anything with it. However, Web sites built on CGI programs can rapidly become overly complicated to main tai n, and there is also the problem of resp onse time. The resp onse of a CGI program depe nds on how much data must be sent, as well as the load on both