96.本科毕业设计外文翻译(附外文原文).doc

本科毕业设计(论文)
外文翻译（附外文原文）
系 ( 院 )： 信息科学与工程学院
课题名称： 学生信息管理系统

专业(方向)：计算机科学与技术（应用）
班 级： 计本06-1班
学 生： 赵兴哲
指导教师： 董明刚
日 期： 2010年4 月
Enter ActionMappings
The Model 2 architecture (see chapter 1) encourages us to use servlets and Java-
Server Pages in the same application. Under Model 2, we start by calling a servlet.
The servlet handles the business logic and directs control to the appropriate page
to complete the response.
The web application deployment descriptor () lets us map a URL pattern
to a servlet. This can be a general pattern, like *.do, or a specific path, like
.
Some applications implement Model 2 by mapping a servlet to each business
operation. This approach works, but many applications involve dozens or hundreds
of business operations. Since servlets are multithreaded, instantiating so manyservlets is not the best use of server resources. Servlets are designed to handle any
number of parallel requests. There is no performance benefit in simply creating
more and more servlets.
The servlet’s primary job is to interact with the container and . Handling
a business operation is something that a servlet could delegate to another component.
Struts does this by having the ActionServlet delegate the business operation
to an object. Using a servlet to receive a request and route it to a handler is known
as the Front Controller pattern [Go3].
Of course, simply delegating the business operation to another component
does not solve the problem of mapping URIs [W3C, URI] to business operations.
Our only way of communicating with a web browser is through requests and
URIs. Arranging for a URI to trigger a business operation is an essential part of
developing a web application.
Meanwhile, in practice many business operations are handled in similar ways.
Since Java is multi