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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 1.4.2) on Thu Oct 16 19:57:35 EDT 2003 --><TITLE>TagSupport (JavaServer Pages API Documentation)</TITLE><META NAME="keywords" CONTENT="javax.servlet.jsp.tagext.TagSupport class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="TagSupport (JavaServer Pages API Documentation)";}</SCRIPT></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=3 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="class-use/TagSupport.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </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/tagext/TagLibraryValidator.html" title="class in javax.servlet.jsp.tagext"><B>PREV CLASS</B></A> <A HREF="../../../../javax/servlet/jsp/tagext/TagVariableInfo.html" title="class in javax.servlet.jsp.tagext"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="TagSupport.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 | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <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.tagext</FONT><BR>Class TagSupport</H2><PRE>java.lang.Object <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>javax.servlet.jsp.tagext.TagSupport</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../javax/servlet/jsp/tagext/IterationTag.html" title="interface in javax.servlet.jsp.tagext">IterationTag</A>, <A HREF="../../../../javax/servlet/jsp/tagext/JspTag.html" title="interface in javax.servlet.jsp.tagext">JspTag</A>, java.io.Serializable, <A HREF="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</A></DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../javax/servlet/jsp/tagext/BodyTagSupport.html" title="class in javax.servlet.jsp.tagext">BodyTagSupport</A></DD></DL><HR><DL><DT>public class <B>TagSupport</B><DT>extends java.lang.Object<DT>implements <A HREF="../../../../javax/servlet/jsp/tagext/IterationTag.html" title="interface in javax.servlet.jsp.tagext">IterationTag</A>, java.io.Serializable</DL><P>A base class for defining new tag handlers implementing Tag. <p> The TagSupport class is a utility class intended to be used as the base class for new tag handlers. The TagSupport class implements the Tag and IterationTag interfaces and adds additional convenience methods including getter methods for the properties in Tag. TagSupport has one static method that is included to facilitate coordination among cooperating tags. <p> Many tag handlers will extend TagSupport and only redefine a few methods.<P><P><DL><DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#javax.servlet.jsp.tagext.TagSupport">Serialized Form</A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#id">id</A></B></CODE><BR> The value of the id attribute of this tag; or null.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected <A HREF="../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#pageContext">pageContext</A></B></CODE><BR> The PageContext.</TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.servlet.jsp.tagext.IterationTag"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface javax.servlet.jsp.tagext.<A HREF="../../../../javax/servlet/jsp/tagext/IterationTag.html" title="interface in javax.servlet.jsp.tagext">IterationTag</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../../javax/servlet/jsp/tagext/IterationTag.html#EVAL_BODY_AGAIN">EVAL_BODY_AGAIN</A></CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.servlet.jsp.tagext.Tag"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface javax.servlet.jsp.tagext.<A HREF="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../../javax/servlet/jsp/tagext/Tag.html#EVAL_BODY_INCLUDE">EVAL_BODY_INCLUDE</A>, <A HREF="../../../../javax/servlet/jsp/tagext/Tag.html#EVAL_PAGE">EVAL_PAGE</A>, <A HREF="../../../../javax/servlet/jsp/tagext/Tag.html#SKIP_BODY">SKIP_BODY</A>, <A HREF="../../../../javax/servlet/jsp/tagext/Tag.html#SKIP_PAGE">SKIP_PAGE</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#TagSupport()">TagSupport</A></B>()</CODE><BR> Default constructor, all subclasses are required to define only a public constructor with the same signature, and to call the superclass constructor.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#doAfterBody()">doAfterBody</A></B>()</CODE><BR> Default processing for a body.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#doEndTag()">doEndTag</A></B>()</CODE><BR> Default processing of the end tag returning EVAL_PAGE.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#doStartTag()">doStartTag</A></B>()</CODE><BR> Default processing of the start tag, returning SKIP_BODY.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#findAncestorWithClass(javax.servlet.jsp.tagext.Tag, java.lang.Class)">findAncestorWithClass</A></B>(<A HREF="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</A> from, java.lang.Class klass)</CODE><BR> Find the instance of a given class type that is closest to a given instance.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#getId()">getId</A></B>()</CODE><BR> The value of the id attribute of this tag; or null.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#getParent()">getParent</A></B>()</CODE><BR> The Tag instance most closely enclosing this tag instance.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.Object</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#getValue(java.lang.String)">getValue</A></B>(java.lang.String k)</CODE><BR> Get a the value associated with a key.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.util.Enumeration</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../javax/servlet/jsp/tagext/TagSupport.html#getValues()">getValues</A></B>()</CODE><BR> Enumerate the keys for the values kept by this tag handler.</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/tagext/TagSupport.html#release()">release</A></B>()</CODE><BR> Release state.</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/tagext/TagSupport.html#removeValue(java.lang.String)">removeValue</A></B>(java.lang.String k)</CODE><BR> Remove a value associated with a key.</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/tagext/TagSupport.html#setId(java.lang.String)">setId</A></B>(java.lang.String id)</CODE><BR> Set the id attribute for this tag.</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/tagext/TagSupport.html#setPageContext(javax.servlet.jsp.PageContext)">setPageContext</A></B>(<A HREF="../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</A> pageContext)</CODE><BR> Set the page context.</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/tagext/TagSupport.html#setParent(javax.servlet.jsp.tagext.Tag)">setParent</A></B>(<A HREF="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</A> t)</CODE><BR> Set the nesting tag of this tag.</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/tagext/TagSupport.html#setValue(java.lang.String, java.lang.Object)">setValue</A></B>(java.lang.String k, java.lang.Object o)</CODE><BR> Associate a value with a String key.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><A NAME="field_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Field Detail</B></FONT></TD></TR></TABLE><A NAME="id"><!-- --></A><H3>id</H3><PRE>protected java.lang.String <B>id</B></PRE><DL><DD>The value of the id attribute of this tag; or null.<P><DL></DL></DL><HR><A NAME="pageContext"><!-- --></A><H3>pageContext</H3><PRE>protected <A HREF="../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</A> <B>pageContext</B></PRE><DL><DD>The PageContext.<P><DL></DL></DL><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">⌨️ 快捷键说明
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