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Having discussed the
objectives, uses, and architecture of SAP Web Application Server, we can now
start building BSP applications. Lets see the structure of a BSP application
(See Figure 2).
Figure 2:
Components of BSP applications
1 Business Server Pages
It is a set of pages that
represent a user interface (layout and page flow definition). The layout
part of a page normally contains ABAP or JavaScript code which is inserted
into the HTML structure. They can contain server-side scripting code in
either JavaScript or ABAP. BSP applications use all the conventional ABAP
technologies, such as Open SQL and internal tables, allowing developers to
create Web pages quickly. This enables existing SAP logic, data structures,
and interfaces to be directly used in Web applications.
2 MIME Objects
In the SAP System, all MIME
objects represent graphics, style sheets or audio and video files that are
managed in a central database called the MIME Repository. For every new BSP
application, an identically named directory in a repository is created,
where you can store all application-specific MIME objects.
3 Theme
It is a container for
MIME objects that are used to adjust the appearance of BSP applications. You
can replace each MIME object in your application with another object from
the file system. Themes are created as individual development objects in the
Web Application Builder and can be assigned to a BSP application to
overwrite preset styles and MIME objects on the pages of that BSP
application.
4 Application Class
The business logic of a BSP
application is encapsulated in an application class. This allows several BSP
applications to use the same application class and provide one business
application that contains different interfaces, such as for various devices,
without having to replicate the business or application logic. The
application class is a regular ABAP Objects class and is realized by means
of a global ABAP class, which implements the access to business data.
5 Controllers
It comprises business logic
and application data. Controllers assess the data of an incoming request
based on a model and then select a suitable view for rendering the response
to the user.
6 The Navigation Structure
It determines which
navigation request is used to direct the navigation process from a
particular page to the subsequent one.
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