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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_14) on Mon Jan 28 05:47:05 PST 2008 --><TITLE>JspApplicationContext (Java EE 5)</TITLE><META NAME="keywords" CONTENT="javax.servlet.jsp.JspApplicationContext interface"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="JspApplicationContext (Java EE 5)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../javax/servlet/jsp/HttpJspPage.html" title="interface in javax.servlet.jsp"><B>PREV CLASS</B></A> <A HREF="../../../javax/servlet/jsp/JspContext.html" title="class in javax.servlet.jsp"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html?javax/servlet/jsp/JspApplicationContext.html" target="_top"><B>FRAMES</B></A> <A HREF="JspApplicationContext.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.servlet.jsp</FONT><BR>Interface JspApplicationContext</H2><HR><DL><DT><PRE>public interface <B>JspApplicationContext</B></DL></PRE><P>Stores application-scoped information relevant to JSP containers. <p>The JSP container must create a single instance of <code>JspApplicationContext</code> for each <code>ServletContext</code> instance.</p> <p>An instance of <code>JspApplicationContext</code> is obtained by invoking the static <A HREF="../../../javax/servlet/jsp/JspFactory.html#getJspApplicationContext(javax.servlet.ServletContext)"><CODE>JspFactory.getJspApplicationContext(javax.servlet.ServletContext)</CODE></A> method, passing the <code>ServletContext</code> of the corresponding web application.</p> <p>The <code>JspApplicationContext</code> provides the following services to JSP applications: <ul> <li>Allows registration of <code>ELResolver</code>s, which are used to resolve variables in EL expressions contained in JSP pages and tag files.</li> <li>Provides an instance of <code>ExpressionFactory</code> for those applications or frameworks that need to perform programmatic evaluation of EL expressions instead of allowing the JSP container to do it for them.</li> <li>Allows the attachment of <code>ELContextListener</code> instances for notification whenever a new <code>ELContext</code> is created. This is necessary when an application wishes to make custom context objects available to their pluggable <code>ELResolver</code>s.</li> </ul> </p><P><P><DL><DT><B>Since:</B></DT> <DD>JSP 2.1</DD><DT><B>See Also:</B><DD><A HREF="../../../javax/servlet/ServletContext.html" title="interface in javax.servlet"><CODE>ServletContext</CODE></A>, <A HREF="../../../javax/servlet/jsp/JspFactory.html" title="class in javax.servlet.jsp"><CODE>JspFactory</CODE></A>, <A HREF="../../../javax/el/ELResolver.html" title="class in javax.el"><CODE>ELResolver</CODE></A>, <A HREF="../../../javax/el/ExpressionFactory.html" title="class in javax.el"><CODE>ExpressionFactory</CODE></A>, <A HREF="../../../javax/el/ELContextListener.html" title="interface in javax.el"><CODE>ELContextListener</CODE></A></DL><HR><P><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/servlet/jsp/JspApplicationContext.html#addELContextListener(javax.el.ELContextListener)">addELContextListener</A></B>(<A HREF="../../../javax/el/ELContextListener.html" title="interface in javax.el">ELContextListener</A> listener)</CODE><BR> Registers a <code>ELContextListener</code>s so that context objects can be added whenever a new <code>ELContext</code> is created.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/servlet/jsp/JspApplicationContext.html#addELResolver(javax.el.ELResolver)">addELResolver</A></B>(<A HREF="../../../javax/el/ELResolver.html" title="class in javax.el">ELResolver</A> resolver)</CODE><BR> Adds an <code>ELResolver</code> to affect the way EL variables and properties are resolved for EL expressions appearing in JSP pages and tag files.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../javax/el/ExpressionFactory.html" title="class in javax.el">ExpressionFactory</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/servlet/jsp/JspApplicationContext.html#getExpressionFactory()">getExpressionFactory</A></B>()</CODE><BR> Returns a factory used to create <code>ValueExpression</code>s and <code>MethodExpression</code>s so that EL expressions can be parsed and evaluated.</TD></TR></TABLE>⌨️ 快捷键说明
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