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Tribhuvan university > CSIT - 2065 Syllabus > Web Technologies > Old Questions > 2071

Web Technologies - Old Questions

Syllabus Notes Old Questions Unit Wise Questions Question Bank

13.  Write short notes on:

a.       Tag libraries

b.      Anonymous access
5 marks | Asked in 2071

a. Tag Libraries

In a Web application, a common design goal is to separate the display code from business logic. Java tag libraries are one solution to this problem. Tag libraries allow you to isolate business logic from the display code by creating a Tag class (which performs the business logic) and including an HTML-like tag in your JSP page. When the Web server encounters the tag within your JSP page, the Web server will call methods within the corresponding Java Tag class to produce the required HTML content.

A tag library defines a collection of custom actions. The tags can be used directly by developers in manually coding a JSP page, or automatically by Java development tools. A tag library must be portable between different JSP container implementations.

A custom tag library is made accessible to a JSP page through a taglib directive of the following general form:

<%@ taglib uri="URI" prefix="prefix" %>

b. Anonymous access

Authentication is the process of determining the identity of a user based on the user’s credentials. The user’s credentials are usually in the form of user ID and password, which is checked against any credentials' store such as database. If the credentials provided by the user are valid, then the user is considered an authenticated user.

In Anonymous Access, there is no authentication performed and the user is treated as anonymous user by Internet Information Services (IIS). Sometimes it is necessary or possible to access any data from remote server or database without any authenticated person. If the data is easily accessible without any authentication (i.e username and password) that means the user accessing those data or file has an anonymous access. There is no difference between a user who is “anonymously authenticated” and an unauthenticated user. There can be many situations where anonymous authentication is useful.