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Asked On2017-05-20 09:28:41 by:arunwebber

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Answers

In JSP tags can be divided into 4 different types.

These are:

Directives: In the directives we can import packages, define error handling pages or the session information of the JSP page.

Declarations: This tag is used for defining the functions and variables to be used in the JSP.

Scriplets: In this tag we can insert any amount of valid java code and these codes are placed in _jspService method by the JSP engine.

Expressions: We can use this tag to output any data on the generated page. These data are automatically converted to string and printed on the output stream.

Syntax of JSP directives is:

<%@directive attribute="value" %>

Where directive may be: page: page is used to provide the information about it. Example: <%@page language="java" %>

include: include is used to include a file in the JSP page. Example: <%@ include file="/header.jsp" %>

taglib: taglib is used to use the custom tags in the JSP pages (custom tags allows us to defined our own tags).Example: <%@ taglib uri="tlds/taglib.tld" prefix="mytag" %> and attribute may be:

language="java"This tells the server that the page is using the java language. Current JSP specification supports only java language. Example: <%@page language="java" %>

extends="mypackage.myclass" This attribute is used when we want to extend any class. We can use comma(,) to import more than one packages. Example: <%@page language="java" import="java.sql.*,mypackage.myclass" %>

session="true" When this value is true session data is available to the JSP page otherwise not. By default this value is true. Example:<%@pagelanguage="java"session="true" %>

errorPage="error.jsp" errorPage is used to handle the un-handled exceptions in the page. Example: <%@page language="java" session="true" errorPage="error.jsp" %>

contentType="text/html;charset=ISO-8859-1" Use this attribute to set the mime type and character set of the JSP. Example: <%@page language="java" session="true" contentType="text/html;charset=ISO-8859-1" %>


Answerd on:2015-12-01 Answerd By:neenu2

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