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Directive

Provides directions and instructions to the container, telling it how to handle certain aspects of the JSP processing

Page

Is used to provide instructions to the container, pertain to the current JSP page

<%@ page attribute = “value”%>
<!-- in XML -->
<jsp:directive.page attribute = “value”>

Attribute

buffer : Specifies a buffering model for the output stream

autoFlush : Controls the behavior of the servlet output buffer

contentType : Defines the character encoding scheme

errorPage : Defines the URL of another JSP that reports on Java unchecked runtime exceptions

isErrorPage : Indicates if this JSP page is a URL specified by another JSP page’s errorPage attribute

extends : Specifies a superclass that the generated servlet must extend

import : Specifies a list of package or classes for use in the JSP as the Java import statement does for Java classes

info : Defines a string that can be accessed with the servlet’s getServletInfo() method

isThreadSafe : Defines the threading model for the generated servlet

language : Defines the programming language used in the JSP page

session : Specifies whether or not the JSP page participates in HTTP sessions

isELIgnored : Specifies whether or not the EL expression within the JSP page will be ignored

isScriptingEnabled : Determines if the scripting elements are allowed for use

The include Directive

Is used to include a file during the translation phase

This directive tells the container to merge the content of other external files with the current JSP during the translation phase

Can code the include directives anywhere in JSP page

<%@include file = “relative url”>

The filename in the include directive is actually a relative URL

If just specify a filename with no associated path, JSP compiler assumes that the file is in the same directory

<jsp:directive.include file = “relative url”>

Can write the XML equivalent

The taglib Directive

JSP pages API allow to define custom JSP tags that look like HTML or XML tags and a tag lib is a set of user-defined tags that implement custom behavior

The taglib directive declares that JSP page uses a set of custom tags, identifies the location of the lib, and provides means for identifying the custom tags in JSP page

<%@ taglib uri = “uri” prefix = “prefixOfTag” >

Can write the XML equivalent

<jsp:directive.taglib uri = “uri” prefix = “prefixOfTag”/>