JavaServer Pages


Defination of JSP

JavaServer Pages (JSP) is a technology that helps software developers create static and dynamically generated web pages based on HTML, XML, or other document types. by Sun Microsystems,Released in 1999. JSP is similar to PHP and ASP, but it uses the Java programming language.

To deploy and run JavaServer Pages, a compatible web server with a servlet container, such as Apache Tomcat or Jetty, is required

The main features of JSP technology are as follows:

● A language for developing JSP pages, which are text-based documents that describe how to process a request and construct a response
● An expression language for accessing server-side objects
● Mechanisms for defining extensions to the JSP language


Overview of JSP

Architecturally, JSP may be viewed as a high-level abstraction of Java servlets. JSPs are translated into servlets at runtime, therefore JSP is a Servlet; each JSP servlet is cached and re-used until the original JSP is modified.

JSP can be used independently or as the view component of a server-side model–view–controller design, normally with JavaBeans as the model and Java servlets as the controller. This is a type of Model 2 architecture.

JSP Architectur

JSP allows Java code and certain pre-defined actions to be interleaved with static web markup content, such as HTML, with the resulting page being compiled and executed on the server to deliver a document. The compiled pages, as well as any dependent Java libraries, contain Java bytecode rather than machine code. Like any other Java program, they must be executed within a Java virtual machine (JVM) that interacts with the server's host operating system to provide an abstract, platform-neutral environment.

Syntax Of JSP Code

JSP pages use several delimiters for scripting functions. The most basic is <% ... %>, which encloses a JSP scriptlet. A scriptlet is a fragment of Java code that is run when the user requests the page. Other common delimiters include <%= ... %> for expressions, where the scriptlet and delimiters are replaced with the result of evaluating the expression, and directives, denoted with <%@ ... %>.

Java code is not required to be complete or self-contained within a single scriptlet block. It can straddle markup content, provided that the page as a whole is syntactically correct. For example, any Java if/for/while blocks opened in one scriptlet must be correctly closed in a later scriptlet for the page to successfully compile.

Screenshots of JSP Program

Following JSP program Example of for loop:


    
// Simple Jsp Program Example

Counting to three:

<% for (int i=1; i<10; i++) { %>

Print number is <%= i %>.

<% } %>

OK.

Download Source code 'Simple JSP Program'

Output Here In cmd Window

Expression Language in JSP

Version 2.0 of the JSP specification added support for the Expression Language (EL), used to access data and functions in Java objects. In JSP 2.1, it was folded into the Unified Expression Language, which is also used in JavaServer Faces

The value of "variable" in the object "javabean" is ${javabean.variable}.

Additional tags in JSP

The JSP syntax add additional tags, called JSP actions, to invoke built-in functionality. Additionally, the technology allows for the creation of custom JSP tag libraries that act as extensions to the standard JSP syntax. One such library is the JSTL, with support for common tasks such as iteration and conditionals (the equivalent of "for" and "if" statements in Java.)

References : wikipedia | oracle

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