Servlet和JSP技术简述英文和翻译
14页1、 毕业设计英文资料翻译TOPIC An Overview of Servlet and JSP Technology 题 目 Servlet和JSP技术简述 作 者 相 凤 珍 届 别 2009 届 系 别 计算机与信息工程系 专 业 通信工程 指导教师 胡 虚 怀 职 称 教 授 完成时间 2009年5月20日 An Overview of Servlet and JSP TechnologyGildas Avoine and Philippe OechslinEPFL, Lausanne, Switzerland1.1 A Servlets JobServlets are Java programs that run on Web or application servers, acting as a middle layer between requests coming from Web browsers or other clients and databases or applications on the server. Their job is to perform t
2、he following tasks, as illustrated in Figure 1-1.Figure 1-11Read the explicit data sent by the 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 client program.2Read the implicit request data sent by the browser.Figure 1-1 shows a single arrow going from the client to the Web server (the layer where servlets and JSP execute), but there are really two varieties of data: the explicit data that the end user ente
3、rs in a form and the behind-the-scenes information. Both varieties are critical. The information includes cookies, information about media types and compression schemes the browser understands, and so on.3Generate 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 or return results in HTML, so the Web brow
4、ser 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 incoming data from the stream, talk to the application, and embed the results inside a document.4Send 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 l
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