BT0083,Server Side Programming-Theory

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ASSIGNMENT

PROGRAM	BSc IT
SEMESTER	FOURTH
SUBJECT CODE & NAME	BT0083,Server Side Programming-Theory
CREDIT	4
BK ID	B1088
MAX.MARKS	60

Q1.Define and explain web servers and application servers.

Answer: A Web server exclusively handles HTTP requests, whereas an application server serves business logic to application programs through any number of protocols.

Let's examine each in more detail.

The Web server

A Web server handles the HTTP protocol. When the Web server receives an HTTP request, it responds with an HTTP response, such as sending back an HTML page. To process a request, a Web server may respond with a static HTML page or image, send a redirect, or delegate the dynamic response generation to some other program such as CGI scripts, JSPs (JavaServer Pages), servlets, ASPs (Active Server Pages), server-side JavaScripts, or some other server-side technology. Whatever their purpose, such server-side programs generate a response, most often in HTML, for viewing in a Web browser.

Q2 Explain Servlet methods used to retrieve data from HTML form. Give an examples.

Answer: Handling form data represented in HTML page is a very common task in web development. A typical scenario is the user fills in fields of a form and submits it. The server will process the request based on the submitted data, and send response back to the client. The following picture depicts that workflow with Java servlet on the server side:

Q.3 Describe the following exception handling methods in a servlet with the help of examples

1. Using the web.xml file

2 Using a RequestDispatcher

1. Using the web.xml file

Answer: When a servlet throws an exception, the web container searches the configurations in web.xml that use the exception-type element for a match with the thrown exception type.

We would have to use the error-page element in web.xml to specify the invocation of servlets in response to certain exceptions or HTTP status codes. Consider, you have an ErrorHandler servlet which would be called whenever there is any defined exception or error. Following would be the entry created in web.xml.

Q2 Using a RequestDispatcher

Answer: The Request Dispatcher interface provides the facility of dispatching the request to another resource it may be html, servlet or jsp. This interface can also be used to include the content of another resource also. It is one of the way of servlet collaboration.

There are two methods defined in the Request Dispatcher interface.

Forward method:

Q.4 Explain the two JSP architectures.

Answer: - The JSP specification presents two approaches for building web applications using JSP pages: JSP Model 1 and Model 2 architectures. These two models differ in the location where the processing takes place. In Model 1 architecture, the JSP page is responsible for processing requests and sending back replies to clients.

The Model 2 architecture, integrates the use of both servlets and JSP pages. In this mode, JSP pages are used for the presentation layer, and servlets for processing tasks. The servlet acts as a controller responsible for processing requests and creating any beans needed by the JSP page. The controller is also responsible for deciding to which JSP page to forward the request. The JSP page retrieves objects created by the servlet and extracts dynamic content for insertion within a template.

This model promotes the use of the Model View

Q5. Draw and explain the diagram of custom tag life cycle.

Answer: The life cycle of a JavaServer Faces page is somewhat similar to that of a JSP page: The client makes an HTTP request for the page, and the server responds with the page translated to HTML. However, the JavaServer Faces life cycle differs from the JSP life cycle in that it is split up into multiple phases in order to support the sophisticated UI component model. This model requires that component data be converted and validated, component events be handled, and component data be propagated to beans in an orderly fashion.

A JavaServer Faces page is also different from a JSP page in that it is represented by a tree of UI components, called a view. During the life cycle, the

Q.6 Describe the process of deactivating Individual Expression Language Statements with example.

Answer:- Deactivating the Expression Language  in an Entire Web Application:-

The JSP 2.0 expression language is automatically in web applications whose deployed descriptor refers to servlet specification version 2.3 or earlier.

On the other hand, the following  web.xml file is compatible with JSP2.0 and thus stipulates  that the expression language should be activated by default.

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