An Introduction To Java Server Page Architecture Computer Science Essay

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Java Server Pages (JSP) is a technology based on the Java language and enables the development of dynamic web sites. JSP was developed by SUN Microsystems to allow server side development. JSP files are HTML files containing special tags which had embeded Java source codes that provide dynamic contents.

JSP Architecture

JSPs are built on top of SUN Microsystems servlet technology. JSPs are essential an HTML page with special JSP tags embedded. These JSP tags can contain Java code. The JSP file extension is .jsp rather than .htm or .html. The JSP engine parses the .jsp and creates a Java servlet source file. It then compiles the source file into a class file,this is done the first time and this why the JSP is probably slower the first time it is accessed. Any time after this the special compiled servlet is executed and is therefore returns faster.

There are two methods for using JSP technology:

Page-Centric Approach

Dispatcher Approach

Page-Centric Approach:

The page-centric approach is also called Client-Server approach. The basic idea of Client-Server approach is that the application lies on the client side and services the requests connecting to the server application. JSP using this approach-processes as follows :

Client makes a request. The JSP page takes the request from client and processes it. The JSP have access to the database by using Java Beans. The requests are processed and the serviced results are sent back to client by JSP.

Dispatcher Approach:

This is also called N-tier approach, where the server side of the above architecture is divided into multiple tiers, using JSP as a controller, passing requests to Java Beans.

JSP is popular because of its processing ability. Processing is distinctly divided between Presentation and Front Components. The popular JSP Architecture is the Model View Controller (MVC) model. In this MVC model, the request is sent by the client browser to the controller or the servlet. This request is instantiated by the servlet as a Java Bean by JSP. The main aspect is JSP that these are compiled into servlets at the back end and the front end tasks are not interrupted. The servlet engine takes up the responsibility of compiling JSP Servlet and producing the final JSP servlet class for usage. The front end presentation modules are handled by JSP for viewing and the manipulation of data is handled by Java Bean and passed back to JSP when needed. The Presentation part of the MVC Model has no processing logic. It performs the task of extracting beans or objects that may have been initially created by the controller. It also extracts the dynamic content within for insertion within its static templates. The Application Manager in the MVC Model is the Controller that processes HTTP requests. They are not responsible for presentation tasks. That can be either servlets or JSP. They take the task of managing the application state, security, and presentation uniformity and thus, have a single point of entry.

This explains the approach and the process of execution of a request.

The following steps execute a JSP request from the time the request is received from client until it is processed and sent back to client :

Request from Client:

A JSP page has the extension as .jsp. The client request is made on the web browser by going to the .jsp extension JSP file.

Request Sent To Server:

The request received from client (web browser) is sent to the server side.

JSP Servlet Engine:

Since the extension of request made has .jsp extension, it indicates that it is a JSP file and therefore the web server passes the request received to the JSP Servlet Engine.

Process of generating servlet:

JSP files are compiled by the JSP engine into a servlet. This step creates the .jsp file as a Java servlet source file.

Process of making class file:

The source file from Step4 is compiled into a class file.

Instantiation of Servlet:

The instantiation of servlet is performed using the init and service methods. In these methods, the jspInit() method is defined by the developer and the jspService method is generated by the JSP engine.

Output HTML:

The request received from client is executed and the output is sent as HTML.

Client Receives the Output:

The Client Receives the Output and the result of format HTML gets displays in the client browser.

Benefits of JSP

One of the main reasons why the JavaServer Pages technology has evolved into what it is today and it is still evolving is the overwhelming technical need to simplify application design by separating dynamic content from static template display data. Another benefit of utilizing JSP is that it allows to more cleanly separate the roles of web application/HTML designer from a software developer. The JSP technology is blessed with a number of exciting benefits, which are chronicled as follows:

The JSP technology is platform independent, in its dynamic web pages, its web servers, and its underlying server components. That is, JSP pages perform perfectly without any hassle on any platform, run on any web server, and web-enabled application server. The JSP pages can be accessed from any web server.

The JSP technology emphasizes the use of reusable components. These components can be combined or manipulated towards developing more purposeful components and page design. This definitely reduces development time apart from the At development time, JSPs are very different from Servlets, however, they are precompiled into Servlets at run time and executed by a JSP engine which is installed on a Web-enabled application server such as BEA WebLogic and IBM WebSphere.

Conclusion

JSP and Servlets are gaining rapid acceptance as means to provide dynamic content on the Internet. With full access to the Java platform, running from the server in a secure manner, the application possibilities are almost limitless. When JSPs are used with Enterprise JavaBeans technology, e-commerce and database resources can be further enhanced to meet an enterprise's needs for web applications providing secure transactions in an open platform. J2EE technology as a whole makes it easy to develop, deploy and use web server applications instead of mingling with other technologies such as CGI and ASP. There are many tools for facilitating quick web software development and to easily convert existing server-side technologies to JSP and Servlets.

Many application server vendors are aggressively deploying JSP within their products. This results in developing robust e-commerce applications as JSP provides XML functionality and scalability. By providing a clear separation between content and coding, JSP solves many problems attached with existing server-side applications.

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