7/18/07

Directive tag in more details

From last post about tag in jsp. This post is about directive tag in more details. Directive tag can devide into three types e.g. page, include and taglib

<%@ directive attribute="value" %>

page directive: page directive will provide the information about the page for jsp engine to compile that page.
Below are some importance attributes of page directive :
language tells the engine about language that the page is using.
usage: <%@ page language="java" %>

extends tell jsp engine that this page will extend from specify class.
usage: <%@ page extends="test.myclass" %>

import used to import any class to use in our jsp page. We can use comma(,) to import more than one packages.
usage: <%@ page import="java.sql.*,mypackage.myclass" %>

session="true|false", default is true so jsp pages are session enable.
usage: <%@ page session="true" %>

buffer, control buffer usage for that jsp page.
usage: <%@ page buffer="none" %>

autoFlush="true|false", if true will automatic clear when buffer is full.
usage: <%@ page autoFlush="true" %>

isThreadSafe="true|false", if true, jsp engine will create new thread for every concurrent request.
usage: <%@ page isThreadSafe="true" %>

errorPage tell the server that which page to go when got un-handled exceptions in the page.
usage: <%@ page errorPage="error.jsp" %>

more than one directives can be used by separate by space.
usage: <%@ page language="java" session="true" contentType="text/html;charset=ISO-8859-1" %>

include directive: include is used to include content in another file into the jsp page. You can use it for header or footer of the page.
<% include file="file to include" %>

usage: <%@ include file="/header.jsp" %>

taglib directive:
next in jsp tag series

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