Page Directives

This directive holds the information which is required to customise the(JSP) page translation. I.e this hold some instructions which helps the translator wheel translating the page into servlet(.java file).

Standard syntax:<%@page attributes %>
xml Syntax:-

page_directive_attr_list :=
{ language="scriptingLanguage }
{ extends="className" }
{ import="importList" }
{ session="true|false" } // default ➡ true
{ buffer="non|sizekb" } // default ➡ 8kb
{ isErrorPage="true|false" } // default ➡ false
{ errorPage="error_url" } // no default
{ ContentType="text/html" } //resp content type // no default value
{ isThreadSafe="true|false" } // default ➡ true
{ info="info_text" } // no default
{ autoflush="true|false" }// default ➡ true
{ pageEncoding="peinfo" }
{ isELIgnored="true|false" } default ➡ true
{ deferredSyntaxAllowedAsLiteral="true|false" } { trimDirective Whitespaces=""true|False" }

Attributes

1• Language

Takes the language which is used in the jsp documentation(i.e. scripting tags)

2• import

Takes one or more packages,which are include into the import statement list while the page is being translated.
with import getting system Data.

<%@ page import="java.util.Date" %>Current date of pc:<%=new Date()%>

Output here this Jsp prgram

Importing multiple packages

<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.net.*" %>


OR
<%@ page import="java.util.*" import="java.io.*" %>
Or
<%@ page import="java.util.*" import="java.io.*" %>

Extend

This attribute takes the complete qualified class name as value. This class should be the subtype of JSPPage

Session

Takes true/false(default is true)We can use this attribute to make session object unavailable to the jsp.
By default session object is available for every jsp.
If we do not want session object then we have to declaring session attribute as follows:

<%@ page session="false" %>

if we are not declaring session attribute or declaring session attribute explicity with true value.the equal generated servlet code in

_jspService() is
HttpSession session=null; Session=pageContext.getSession();

Because of these two lines session object available to the jsp.
If we are declaring the session attribute explicitly with "false" value,then the above 2 lines code won't be generated and hence session object won't be available to the JSP.
generated and hence session object won't be available to the JSP.

Buffer

Takes the buffer size like 8kb,16kb,32kb.we can also specify 0kb.

Autoflush

True/false default is true

Errorpage

Value contains the path of the page to which the request to be dispatched when an error is raised in the document.

Iserrorpage

Takes true/false default is false if this is true then we are available with one implicit object exception of type Throwable
Note:Page directives can be used in the jsp document for any number of times.but the same attributes except import should not be repeated
Page directive must be at the begining of the page(Preceedingtag) « Privious Post » « Next Post » share on :        :  

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