docs:programming:jsp:jsp_directives [hartungdesign.net wiki]

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====== JSP Directives ======
<code>
	<%@ directive attribute="value" %>
	<%@ directive attr1="value" attr2="value" ... attrN="value" %>
</code>
 
Directives are used to specify the structure of the resulting servlet. There are three directives: page, include, and taglib

===== The page Directive =====
There are 11 specifiable attributes for this directive: import, contentType, isThreadSafe, session, buffer, autoflush, extends, info, errorPage, and language

Example
<code>
	<%@ page language="java" contentType="text/html" %>
	
	<%@ page contentType="application/vnd.ms-excel" %>
	<%@ page import="java.util.*" %>
 
	<%@ page import="java.util.*,java.io.*" %>
</code>

Directives can be placed anywhere in the document, but are often placed at the very top.
<code>
    <%@ page language="java" contentType="text/html import="java.util.*" %>
   <HTML>
    <HEAD>
     <TITLE>Hello World</TITLE>
    </HEAD>
    <BODY>
     <H1>Hello World</H1>
     Today is: <%= new Date().toString() %>
    </BODY>
   </HTML>
</code>

===== The include Directive =====
Is used to include a file in the main document.

There are two versions of this. The first one, shown below, includes the file at translation time.
<code>
	<%@ include file="relative URL of file" %>
</code>

The second version, includes the file at request time.
<code>
	<jsp:include page="ralative URL of file" flush=true />
</code>
 
===== The taglib directive =====
This is used to define custom markup tags. Refer to JSP documentation for details on this.