1、郑州轻工业学院 本科毕业设计（论文） 英文 翻译 题 目 Servlet 和 Jsp 技术概要 学生姓名 娄文 专业班级 软件工程 08-1 学 号 520813130116 院 （系） 软件 学院 指导教师 聂南 （ 副 教授） 完成时间 2012 年 6 月 2 日 Servlet 和 Jsp 技术概要 软件工程 08-1 娄文 520813130116 2 An Overview of Servlet and JSP Technology Abstract: Servlet program running in the server-side, dynamically generated
2、 Web page with the traditional CGI and many other similar compared to CGI technology, Java Servlet with a more efficient, easier to use, more powerful and has better portability, more savings to invest . Key words: JSP Technology, Servlet, HTTP server 1.1 A Servlets Job Servlets are Java programs th
3、at run on Web or application servers, acting as a middle layer between requests coming from Web browsers or other HTTP clients and databases or applications on the HTTP server. Their job is to perform the following tasks, as illustrated in Figure 1-1. Figure 1-1 1 Read the explicit data sent by the
4、client. The end user normally enters this data in an HTML form on a Web page. However, the data could also come from an applet or a custom HTTP client program. 2 Read the implicit HTTP request data sent by the browser. Figure 1-1 shows a single arrow going from the client to the Web server (the laye
5、r where servlets and JSP execute), but there are really two varieties of data: the explicit data that the end user enters in a form and the behind-the-scenes HTTP information. Both varieties are critical. The HTTP information includes cookies, information about media types and compression schemes th
6、e browser understands, and so on. 3 Generate the results. This process may require talking to a database, executing an RMI or EJB call, invoking a Web service, or computing the response directly. Your real data may be in a relational database. Fine. But your database probably doesnt speak HTTP or re
7、turn results in HTML, so the Web browser cant talk directly to the database. Even if it could, for security reasons, you probably would not want it to. The same argument applies to most other applications.You need the Web middle layer to extract the results inside a document. 4 Send the explicit data (i.e., the document) to the client. This document can be sent in a variety of formats, including text (HTML or XML), binary (GIF images), or even a compressed format like gzip that is layered on top of some other underlying format. But, HTML is by far the most common format,
