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Introduction to JSP-Java Server Pages
Java Server Pages abbreviated as JSP is a Java technology that helps software developers serve dynamically generated web pages which are based XML, HTML, or other document types. JSP was designed to address the opinion that the Java programming environment didn't offer developers with adequate hold up for the Web. JSP may be viewed as a high-level abstraction of Java servlets in architecture point of view. Generally JSP pages are first loaded in the server and then they are operated from a structured special installed Java Server Packet called a Java EE Web Application, which has file extensions namely .war and .ear. JSP allows one to interlink the Java code and certain pre-defined actions with static web markup content, and then the resulting page is compiled and executed on the server to deliver a XML or HTML document. Any dependent Java libraries and the compiled pages use Java bytecode rather than a native software format, and therefore must be executed within a Java virtual machine (JVM) that integrates with the host operating system to provide an abstract platform-neutral environment.
JavaServer Pages JSP is a technology mainly used for rapidly development of dynamic web pages, As the part of Java, JSP technology is used to develop rapid web based application development. JSP technology is platform independent, thus it is very useful in internet applications.
JSP program is complied into servlets by JSP compiler. The compiler can generate a servlet in JAVA code and then this code is compiled by JAVA compiler. Other option is to compile servlets to byte code which is directly executable.
Markup and scriptlet elements are the basic forms of syntax in JSP. Where markup is basically standard XML or HTM. And scriptlet elements are enclosed blocks of Java code which may be intermixed with the markup. When a particular page is requested the Java code is executed and its output is added in the original place with the surrounding markup to create the final page. Before execution JSP pages must be compiled to Java bytecode classes, but such compilation is needed only when a change to the source JSP file has taken place. Java code is not compulsory to be complete (self contained) within its scriptlet element block, but can include markup content given that the page as a whole is syntactically accurate. Say for example, if any Java if/for/while block is opened in one scriptlet element must be properly closed in a later element for the page to effectively compile. This system of split inline coding sections is called step over scripting because it can enclose around the static markup by stepping over it. So markup inside an if block will only appear in the output when the if condition assesses to true; similarly markup inside a loop assemble may come out multiple times in the output depending upon how many times the loop body runs.
To cite integral functionality supplementary XML-like tags, described JSP actions are added by the JSP syntax.. As well, the technology permits for the construction of JSP tag libraries that act as extensions to the standard XML or HTML tags. So main features of JSP are firstly, it is easy to use as JSP pages are installed simply as web pages using natural configuration of web server document tree and secondly it is Platform independent.
JSP Advanced Features:
1. Easy use of JSP (Java knowledge is not essential)
2. Extend JSP language: Use of Java tag library makes easy to extend JSP language.
3. Easy write and development of web pages JavaServer Pages Standard Tag Library (JSTL) expression language has been integrated with JSP technology. It makes easy development of dynamic pages which supports functions.
4. You can put JSP tags with HTML
5. Able to use Java program
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