活动服务器页面(外文翻译）.docVIP

1、Active Server Pages Just like ASPs，JSPs contain HTML for page layout and use embedded Java programming code that allows dynamic content to be displayed on a Web page． The JSP gets compiled into servlet byte code to process the Web browser request to a database or another application． JSP developers use static HTML， scriptlets (snippets of Java code) and tags to create the page that loads in the Web browser．The tags and scriptlets encapsulate the business logic on the HTML page． When the browser makes a request，the embedded code runs in a servlet engine，which interprets the JSP tags and scriptlets and sends the results back as an HTML page to the browser． ◆ ASPs vs. JSPs “JSPs were created later，and they誶e a knockoff of ASPs，”says Yefim Natis，an analyst at Gartner Group Inc．，noting that the introduction of both ASPs and JSPs aided in reducing the time and costs required to maintain and develop Web-based applications． JSPs and ASPs allow database content，or data from other applications，to be pulled from those resources and displayed on the Web page by a browser． Both technologies emerged to contend with static， predefined Web pages developed using HTML． By separating the user interface (the appearance of the page) from the content-generation functionality， developers have an easier task of changing both the page layout and the dynamic content． ◆ Labor Saver In the old days， if you wanted to make changes to an HTML page， like to a price in a catalog， you would have to physically change the price on every single item． When using ASPs or JSPs， the information gets populated on the page dynamically，and all you have to change is the price data in the database． It allows you to take a lot of the labor out of producing online information． Before the advent of ASP and JSP technologies，developers had to write Common Gateway Interface (CGI) scripts，using languages such as Perl，C or C++ to process user input from the Web browser to the Web server．But CGI scripts pre