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2024年3月12日发(作者：会计transfer是什么意思)

Servlet和JSP

中英文资料外文翻译文献

An Overview of Servlet and JSP Technology

Marty Hall and Larry Brown，2000-07, Core Servlets and JavaServer Pages

chapter 1

1.1 A Servlet's Job

Servlets are Java programs that 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 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

layer 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 the 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 doesn't speak HTTP or

return results in HTML, so the Web browser can't 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


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