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ActionForm (Apache Struts API Documentation)
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org.apache.struts.action</FONT>
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Class ActionForm</H2>
<PRE>
java.lang.Object
|
+--<B>org.apache.struts.action.ActionForm</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable</DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/struts/action/DynaActionForm.html">DynaActionForm</A>, <A HREF="../../../../org/apache/struts/validator/ValidatorForm.html">ValidatorForm</A></DD>
</DL>
<HR>
<DL>
<DT>public abstract class <B>ActionForm</B><DT>extends java.lang.Object<DT>implements java.io.Serializable</DL>
<P>
<p>An <strong>ActionForm</strong> is a JavaBean optionally associated with
one or more <code>ActionMappings</code>. Such a bean will have had its
properties initialized from the corresponding request parameters before
the corresonding action's <code>execute</code> method is called.</p>
<p>When the properties of this bean have been populated, but before the
<code>execute</code> method of the action is called, this bean's
<code>validate</code> method will be called, which gives the bean a chance
to verify that the properties submitted by the user are correct and valid.
If this method finds problems, it returns an error messages object that
encapsulates those problems, and the controller servlet will return control
to the corresponding input form. Otherwise, the <code>validate</code>
method returns <code>null</code>, indicating that everything is acceptable
and the corresponding Action's <code>execute</code> method should be
called.</p>
<p>This class must be subclassed in order to be instantiated. Subclasses
should provide property getter and setter methods for all of the bean
properties they wish to expose, plus override any of the public or
protected methods for which they wish to provide modified functionality.
</p>
<p>Because ActionForms are JavaBeans, subclasses should also implement
<code>Serializable</code>, as required by the JavaBean specification.
Some containers require that an object meet all JavaBean requirements
in order to use the introspection API upon which ActionForms rely.</p>
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>$Revision: 1.1 $ $Date: 2003-08-22 09:14:33 +0100 (Fri, 22 Aug 2003) $</DD>
<DT><B>Author:</B></DT>
<DD>Craig R. McClanahan, Ted Husted</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html" TARGET="org.apache.struts.action.ActionForm">Serialized Form</A></DL>
<HR>
<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->
<!-- =========== FIELD SUMMARY =========== -->
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<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 <A HREF="../../../../org/apache/struts/upload/MultipartRequestHandler.html">MultipartRequestHandler</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/action/ActionForm.html#multipartRequestHandler">multipartRequestHandler</A></B></CODE>
<BR>
The MultipartRequestHandler for this form, can be
<code>null</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <A HREF="../../../../org/apache/struts/action/ActionServlet.html">ActionServlet</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/action/ActionForm.html#servlet">servlet</A></B></CODE>
<BR>
The controller servlet instance to which we are attached.</TD>
</TR>
</TABLE>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<A NAME="constructor_summary"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<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="../../../../org/apache/struts/action/ActionForm.html#ActionForm()">ActionForm</A></B>()</CODE>
<BR>
</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
<A NAME="method_summary"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<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> <A HREF="../../../../org/apache/struts/upload/MultipartRequestHandler.html">MultipartRequestHandler</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/action/ActionForm.html#getMultipartRequestHandler()">getMultipartRequestHandler</A></B>()</CODE>
<BR>
Return the MultipartRequestHandler for this form
The reasoning behind this is to give form bean developers
control over the lifecycle of their multipart requests
through the use of the finish() and/or rollback() methods
of MultipartRequestHandler.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected <A HREF="../../../../org/apache/struts/action/ActionServlet.html">ActionServlet</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/action/ActionForm.html#getServlet()">getServlet</A></B>()</CODE>
<BR>
Return the controller servlet instance to which we are attached.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/apache/struts/action/ActionServletWrapper.html">ActionServletWrapper</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/action/ActionForm.html#getServletWrapper()">getServletWrapper</A></B>()</CODE>
<BR>
Return the controller servlet instance to which we are attached.</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="../../../../org/apache/struts/action/ActionForm.html#reset(org.apache.struts.action.ActionMapping, javax.servlet.http.HttpServletRequest)">reset</A></B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A> mapping,
javax.servlet.http.HttpServletRequest request)</CODE>
<BR>
Reset all bean properties to their default 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="../../../../org/apache/struts/action/ActionForm.html#reset(org.apache.struts.action.ActionMapping, javax.servlet.ServletRequest)">reset</A></B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A> mapping,
javax.servlet.ServletRequest request)</CODE>
<BR>
Reset all bean properties to their default 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="../../../../org/apache/struts/action/ActionForm.html#setMultipartRequestHandler(org.apache.struts.upload.MultipartRequestHandler)">setMultipartRequestHandler</A></B>(<A HREF="../../../../org/apache/struts/upload/MultipartRequestHandler.html">MultipartRequestHandler</A> multipartRequestHandler)</CODE>
<BR>
Set the Handler provides to use in dealing with file uploads.</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="../../../../org/apache/struts/action/ActionForm.html#setServlet(org.apache.struts.action.ActionServlet)">setServlet</A></B>(<A HREF="../../../../org/apache/struts/action/ActionServlet.html">ActionServlet</A> servlet)</CODE>
<BR>
Set the controller servlet instance to which we are attached (if
<code>servlet</code> is non-null), or release any allocated resources
(if <code>servlet</code> is null).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/apache/struts/action/ActionErrors.html">ActionErrors</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/action/ActionForm.html#validate(org.apache.struts.action.ActionMapping, javax.servlet.http.HttpServletRequest)">validate</A></B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A> mapping,
javax.servlet.http.HttpServletRequest request)</CODE>
<BR>
Validate the properties that have been set for this HTTP request,
and return an <code>ActionErrors</code> object that encapsulates any
validation errors that have been found.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/apache/struts/action/ActionErrors.html">ActionErrors</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/action/ActionForm.html#validate(org.apache.struts.action.ActionMapping, javax.servlet.ServletRequest)">validate</A></B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A> mapping,
javax.servlet.ServletRequest request)</CODE>
<BR>
Validate the properties that have been set for this non-HTTP request,
and return an <code>ActionErrors</code> object that encapsulates any
validation errors that have been found.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<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" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Field Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="servlet"><!-- --></A><H3>
servlet</H3>
<PRE>
protected transient <A HREF="../../../../org/apache/struts/action/ActionServlet.html">ActionServlet</A> <B>servlet</B></PRE>
<DL>
<DD>The controller servlet instance to which we are attached.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="multipartRequestHandler"><!-- --></A><H3>
multipartRequestHandler</H3>
<PRE>
protected transient <A HREF="../../../../org/apache/struts/upload/MultipartRequestHandler.html">MultipartRequestHandler</A> <B>multipartRequestHandler</B></PRE>
<DL>
<DD>The MultipartRequestHandler for this form, can be
<code>null</code>.
<P>
<DL>
</DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="ActionForm()"><!-- --></A><H3>
ActionForm</H3>
<PRE>
public <B>ActionForm</B>()</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="getServlet()"><!-- --></A><H3>
getServlet</H3>
<PRE>
protected <A HREF="../../../../org/apache/struts/action/ActionServlet.html">ActionServlet</A> <B>getServlet</B>()</PRE>
<DL>
<DD>Return the controller servlet instance to which we are attached.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getServletWrapper()"><!-- --></A><H3>
getServletWrapper</H3>
<PRE>
public <A HREF="../../../../org/apache/struts/action/ActionServletWrapper.html">ActionServletWrapper</A> <B>getServletWrapper</B>()</PRE>
<DL>
<DD>Return the controller servlet instance to which we are attached.
as an ActionServletWrapper.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>Struts 1.0.1</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/struts/action/ActionServletWrapper.html"><CODE>ActionServletWrapper</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getMultipartRequestHandler()"><!-- --></A><H3>
getMultipartRequestHandler</H3>
<PRE>
public <A HREF="../../../../org/apache/struts/upload/MultipartRequestHandler.html">MultipartRequestHandler</A> <B>getMultipartRequestHandler</B>()</PRE>
<DL>
<DD>Return the MultipartRequestHandler for this form
The reasoning behind this is to give form bean developers
control over the lifecycle of their multipart requests
through the use of the finish() and/or rollback() methods
of MultipartRequestHandler. This method will return
<code>null</code> if this form's enctype is not
"multipart/request-data".
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/struts/upload/MultipartRequestHandler.html"><CODE>MultipartRequestHandler</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="setServlet(org.apache.struts.action.ActionServlet)"><!-- --></A><H3>
setServlet</H3>
<PRE>
public void <B>setServlet</B>(<A HREF="../../../../org/apache/struts/action/ActionServlet.html">ActionServlet</A> servlet)</PRE>
<DL>
<DD>Set the controller servlet instance to which we are attached (if
<code>servlet</code> is non-null), or release any allocated resources
(if <code>servlet</code> is null).
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>servlet</CODE> - The new controller servlet, if any</DL>
</DD>
</DL>
<HR>
<A NAME="setMultipartRequestHandler(org.apache.struts.upload.MultipartRequestHandler)"><!-- --></A><H3>
setMultipartRequestHandler</H3>
<PRE>
public void <B>setMultipartRequestHandler</B>(<A HREF="../../../../org/apache/struts/upload/MultipartRequestHandler.html">MultipartRequestHandler</A> multipartRequestHandler)</PRE>
<DL>
<DD>Set the Handler provides to use in dealing with file uploads.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>multipartRequestHandler</CODE> - The Handler to use for fileuploads.</DL>
</DD>
</DL>
<HR>
<A NAME="reset(org.apache.struts.action.ActionMapping, javax.servlet.ServletRequest)"><!-- --></A><H3>
reset</H3>
<PRE>
public void <B>reset</B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A> mapping,
javax.servlet.ServletRequest request)</PRE>
<DL>
<DD>Reset all bean properties to their default state. This method is
called before the properties are repopulated by the controller servlet.
<p>
The default implementation attempts to forward to the HTTP
version of this method.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>mapping</CODE> - The mapping used to select this instance<DD><CODE>request</CODE> - The servlet request we are processing</DL>
</DD>
</DL>
<HR>
<A NAME="reset(org.apache.struts.action.ActionMapping, javax.servlet.http.HttpServletRequest)"><!-- --></A><H3>
reset</H3>
<PRE>
public void <B>reset</B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A> mapping,
javax.servlet.http.HttpServletRequest request)</PRE>
<DL>
<DD>Reset all bean properties to their default state. This method is
called before the properties are repopulated by the controller servlet.
<p>
The default implementation does nothing. Subclasses should override
this method to reset all bean properties to default values.
</p>
<p>
This method is <strong>not</strong> the appropriate place to initialize form values
for an "update" type page (this should be done in a setup Action). You mainly
need to worry about setting checkbox values to false; most of the time you
can leave this method unimplemented.
</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>mapping</CODE> - The mapping used to select this instance<DD><CODE>request</CODE> - The servlet request we are processing</DL>
</DD>
</DL>
<HR>
<A NAME="validate(org.apache.struts.action.ActionMapping, javax.servlet.ServletRequest)"><!-- --></A><H3>
validate</H3>
<PRE>
public <A HREF="../../../../org/apache/struts/action/ActionErrors.html">ActionErrors</A> <B>validate</B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A> mapping,
javax.servlet.ServletRequest request)</PRE>
<DL>
<DD>Validate the properties that have been set for this non-HTTP request,
and return an <code>ActionErrors</code> object that encapsulates any
validation errors that have been found. If no errors are found, return
<code>null</code> or an <code>ActionErrors</code> object with no
recorded error messages.
<p>
The default implementation attempts to forward to the HTTP version of
this method.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>mapping</CODE> - The mapping used to select this instance<DD><CODE>request</CODE> - The servlet request we are processing</DL>
</DD>
</DL>
<HR>
<A NAME="validate(org.apache.struts.action.ActionMapping, javax.servlet.http.HttpServletRequest)"><!-- --></A><H3>
validate</H3>
<PRE>
public <A HREF="../../../../org/apache/struts/action/ActionErrors.html">ActionErrors</A> <B>validate</B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A> mapping,
javax.servlet.http.HttpServletRequest request)</PRE>
<DL>
<DD>Validate the properties that have been set for this HTTP request,
and return an <code>ActionErrors</code> object that encapsulates any
validation errors that have been found. If no errors are found,
return <code>null</code> or an <code>ActionErrors</code> object with
no recorded error messages.
<p>
The default ipmlementation performs no validation and returns
<code>null</code>. Subclasses must override this method to provide
any validation they wish to perform.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>mapping</CODE> - The mapping used to select this instance<DD><CODE>request</CODE> - The servlet request we are processing</DL>
</DD>
</DL>
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