jsppage.html
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Java 2 Platform EE v1.3: Interface JspPage
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javax.servlet.jsp</FONT>
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Interface JspPage</H2>
<DL>
<DT><B>All Superinterfaces:</B> <DD><A HREF="../../../javax/servlet/Servlet.html">Servlet</A></DD>
</DL>
<DL>
<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../javax/servlet/jsp/HttpJspPage.html">HttpJspPage</A></DD>
</DL>
<HR>
<DL>
<DT>public interface <B>JspPage</B><DT>extends <A HREF="../../../javax/servlet/Servlet.html">Servlet</A></DL>
<P>
The JspPage interface describes the generic interaction that a JSP Page
Implementation class must satisfy; pages that use the HTTP protocol
are described by the HttpJspPage interface.
<p><B>Two plus One Methods</B>
<p>
The interface defines a protocol with 3 methods; only two of
them: jspInit() and jspDestroy() are part of this interface as
the signature of the third method: _jspService() depends on
the specific protocol used and cannot be expressed in a generic
way in Java.
<p>
A class implementing this interface is responsible for invoking
the above methods at the appropriate time based on the
corresponding Servlet-based method invocations.
<p>
The jspInit() and jspDestroy() methods can be defined by a JSP
author, but the _jspService() method is defined automatically
by the JSP processor based on the contents of the JSP page.
<p><B>_jspService()</B>
<p>
The _jspService()method corresponds to the body of the JSP page. This
method is defined automatically by the JSP container and should never
be defined by the JSP page author.
<p>
If a superclass is specified using the extends attribute, that
superclass may choose to perform some actions in its service() method
before or after calling the _jspService() method. See using the extends
attribute in the JSP_Engine chapter of the JSP specification.
<p>
The specific signature depends on the protocol supported by the JSP page.
<pre>
public void _jspService(<em>ServletRequestSubtype</em> request,
<em>ServletResponseSubtype</em> response)
throws ServletException, IOException;
</pre>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/jsp/JspPage.html#jspDestroy()">jspDestroy</A></B>()</CODE>
<BR>
The jspDestroy() method is invoked when the JSP page is about to be
destroyed.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/jsp/JspPage.html#jspInit()">jspInit</A></B>()</CODE>
<BR>
The jspInit() method is invoked when the JSP page is initialized.</TD>
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<TD><B>Methods inherited from interface javax.servlet.<A HREF="../../../javax/servlet/Servlet.html">Servlet</A></B></TD>
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<TD><CODE><A HREF="../../../javax/servlet/Servlet.html#destroy()">destroy</A>, <A HREF="../../../javax/servlet/Servlet.html#getServletConfig()">getServletConfig</A>, <A HREF="../../../javax/servlet/Servlet.html#getServletInfo()">getServletInfo</A>, <A HREF="../../../javax/servlet/Servlet.html#init(javax.servlet.ServletConfig)">init</A>, <A HREF="../../../javax/servlet/Servlet.html#service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)">service</A></CODE></TD>
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<A NAME="jspInit()"><!-- --></A><H3>
jspInit</H3>
<PRE>
public void <B>jspInit</B>()</PRE>
<DL>
<DD>The jspInit() method is invoked when the JSP page is initialized. It
is the responsibility of the JSP implementation (and of the class
mentioned by the extends attribute, if present) that at this point
invocations to the getServletConfig() method will return the desired
value.
A JSP page can override this method by including a definition for it
in a declaration element.
A JSP page should redefine the init() method from Servlet.<DD><DL>
</DL>
</DD>
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<HR>
<A NAME="jspDestroy()"><!-- --></A><H3>
jspDestroy</H3>
<PRE>
public void <B>jspDestroy</B>()</PRE>
<DL>
<DD>The jspDestroy() method is invoked when the JSP page is about to be
destroyed.
A JSP page can override this method by including a definition for it
in a declaration element.
A JSP page should redefine the destroy() method from Servlet.<DD><DL>
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</DD>
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