jsp外文翻譯--jsp技術(shù)概述與應(yīng)用框架

1、14800 英文單詞 英文單詞,2.4 萬英文字符 萬英文字符,中文 中文 8200 字Overview of JSP Technology and JSP application frameworks1． Benefits of JSPJSP pages are translated into servlets. So, fundamentally, any task JSP pages can perform could also

2、be accomplished by servlets. However, this underlying equivalence does not mean that servlets and JSP pages are equally appropriate in all scenarios. The issue is not the power of the technology, it is the convenience, p

3、roductivity, and maintainability of one or the other. After all, anything you can do on a particular computer platform in the Java programming language you could also do in assembly language. But it still matters which y

4、ou choose.JSP provides the following benefits over servlets alone:? It is easier to write and maintain the HTML. Your static code is ordinary HTML: no extra backslashes, no double quotes, and no lurking Java syntax.? Y

5、ou can use standard Web-site development tools. Even HTML tools that know nothing about JSP can be used because they simply ignore the JSP tags.? You can divide up your development team. The Java programmers can work on

6、the dynamic code. The Web developers can concentrate on the presentation layer. On large projects, this division is very important. Depending on the size of your team and the complexity of your project, you can enforce a

7、 weaker or stronger separation between the static HTML and the dynamic content.Now, this discussion is not to say that you should stop using servlets and use only JSP instead. By no means. Almost all projects will use bo

8、th. For some requests in your project, you will use servlets. For others, you will use JSP. For still others, you will combine them with the MVC architecture . You want the appropriate tool for the job, and servlets, by

9、themselves, do not complete your toolkit.2． Advantages of JSP Over Competing TechnologiesA number of years ago, Marty was invited to attend a small 20-person industry roundtable discussion on software technology. Sitting

10、 in the seat next to Marty was James Gosling, inventor of the Java programming language. Sitting several seats away 3You could make the same argument when comparing JSP to the previous version of ColdFusion; with JSP you

11、 can use Java for the “real code“ and are not tied to a particular server product. However, the current release of ColdFusion is within the context of a J2EE server, allowing developers to easily mix ColdFusion and servl

12、et/JSP code.2.2 Versus PHPPHP (a recursive acronym for “PHP: Hypertext Preprocessor“) is a free, open-source, HTML-embedded scripting language that is somewhat similar to both ASP and JSP. One advantage of JSP is that t

13、he dynamic part is written in Java, which already has an extensive API for networking, database access, distributed objects, and the like, whereas PHP requires learning an entirely new, less widely used language. A secon

14、d advantage is that JSP is much more widely supported by tool and server vendors than is PHP.2.3 Versus Pure ServletsJSP doesn't provide any capabilities that couldn't, in principle, be accomplished with servlet

15、s. In fact, JSP documents are automatically translated into servlets behind the scenes. But it is more convenient to write (and to modify!) regular HTML than to use a zillion println statements to generate the HTML. Plus

16、, by separating the presentation from the content, you can put different people on different tasks: your Web page design experts can build the HTML by using familiar tools and either leave places for your servlet program

17、mers to insert the dynamic content or invoke the dynamic content indirectly by means of XML tags.Does this mean that you can just learn JSP and forget about servlets? Absolutely not! JSP developers need to know servlets

18、for four reasons:1. JSP pages get translated into servlets. You can't understand how JSP works without understanding servlets.2. JSP consists of static HTML, special-purpose JSP tags, and Java code. What kind of Java

19、 code? Servlet code! You can't write that code if you don't understand servlet programming.3. Some tasks are better accomplished by servlets than by JSP. JSP is good at generating pages that consist of large sect

20、ions of fairly well structured HTML or other character data. Servlets are better for generating binary data, building pages with highly variable structure, and performing tasks (such as redirection) that involve little o