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Apache Struts API Documentation: Package org.apache.struts.util
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<H2>
Package org.apache.struts.util
</H2>
The Utilities package provides a variety of families of classes,
to solve problems that are commonly encountered in building web applications.
<P>
<B>See: </B>
<BR>
<A HREF="#package_description"><B>Description</B></A>
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<B>Class Summary</B></FONT></TD>
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<TD WIDTH="15%"><B><A HREF="ImageButtonBean.html">ImageButtonBean</A></B></TD>
<TD>A simple JavaBean to encapsulate the request parameters sent for an HTML input element of type image.</TD>
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<TD WIDTH="15%"><B><A HREF="IteratorAdapter.html">IteratorAdapter</A></B></TD>
<TD>Utility method for converting Enumeration to an Iterator class.</TD>
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<TD WIDTH="15%"><B><A HREF="LabelValueBean.html">LabelValueBean</A></B></TD>
<TD>A simple JavaBean to represent label-value pairs.</TD>
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<TD WIDTH="15%"><B><A HREF="MessageResources.html">MessageResources</A></B></TD>
<TD>General purpose abstract class that describes an API for retrieving Locale-sensitive messages from underlying resource locations of an unspecified design, and optionally utilizing the <code>MessageFormat</code> class to produce internationalized messages with parametric replacement.</TD>
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<TD WIDTH="15%"><B><A HREF="MessageResourcesFactory.html">MessageResourcesFactory</A></B></TD>
<TD>Factory for <code>MessageResources</code> instances.</TD>
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<TD WIDTH="15%"><B><A HREF="ModuleUtils.html">ModuleUtils</A></B></TD>
<TD>General purpose utility methods related to module processing.</TD>
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<TD WIDTH="15%"><B><A HREF="PropertyMessageResources.html">PropertyMessageResources</A></B></TD>
<TD>Concrete subclass of <code>MessageResources</code> that reads message keys and corresponding strings from named property resources in the same manner that <code>java.util.PropertyResourceBundle</code> does.</TD>
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<TD WIDTH="15%"><B><A HREF="PropertyMessageResourcesFactory.html">PropertyMessageResourcesFactory</A></B></TD>
<TD>Factory for <code>PropertyMessageResources</code> instances.</TD>
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<TD WIDTH="15%"><B><A HREF="RequestUtils.html">RequestUtils</A></B></TD>
<TD>General purpose utility methods related to processing a servlet request in the Struts controller framework.</TD>
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<TD WIDTH="15%"><B><A HREF="ResponseUtils.html">ResponseUtils</A></B></TD>
<TD>General purpose utility methods related to generating a servlet response in the Struts controller framework.</TD>
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<TD WIDTH="15%"><B><A HREF="ServletContextWriter.html">ServletContextWriter</A></B></TD>
<TD>A PrintWriter implementation that uses the logging facilities of a <code>javax.servlet.ServletContext</code> to output its results.</TD>
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<TD WIDTH="15%"><B><A HREF="TokenProcessor.html">TokenProcessor</A></B></TD>
<TD>TokenProcessor is responsible for handling all token related functionality.</TD>
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<TD WIDTH="15%"><B><A HREF="WildcardHelper.html">WildcardHelper</A></B></TD>
<TD>This class is an utility class that perform wilcard-patterns matching and isolation taken from Apache Cocoon.</TD>
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<B>Exception Summary</B></FONT></TD>
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<TD WIDTH="15%"><B><A HREF="ModuleException.html">ModuleException</A></B></TD>
<TD>Used for specialized exception handling.</TD>
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<P>
<A NAME="package_description"><!-- --></A><H2>
Package org.apache.struts.util Description
</H2>
<P>
The Utilities package provides a variety of families of classes,
to solve problems that are commonly encountered in building web applications.
<br><br>
<a name="doc.Description"></a>
<div align="center">
<a href="#doc.Intro">[Introduction]</a>
<a href="#doc.Beans">[Beans]</a>
<a href="#doc.Utilities">[Servlet Utilities]</a>
<a href="#doc.Messages">[Message Resources]</a>
</div>
<hr>
<a name="doc.Intro"></a>
<h3>Introduction</h3>
<p>The Struts Utilities Package offers several families
of classes that assist in solving commonly encountered problems when building
web applications. Most of the classes in this package do not rely on the
controller servlet framework, or the custom tag libraries, so they are also
suitable for general Java application programming. The following families
are included:</p>
<ul>
<li><a href="#doc.Beans">Beans</a> - A small set of utility beans useful for
encapsulating form elements.</li>
<li><a href="#doc.Utilities">Servlet Utilities</a> - A set of classes useful
for working with servlet-related classes.</li>
<li><a href="#doc.Messages">Message Resources</a> - A family of classes that
features access to internationalized message strings based on a message
key coupled with a <code>java.util.Locale</code> object representing a
particular user's preferred language.</li>
</ul>
<hr>
<a name="doc.Beans"></a>
<h3>Beans</h3>
<p> The <code>ImageButtonBean</code> is a simple JavaBean to encapsulate the
request parameters sent for an HTML input element of type image. The
<code>LabelValueBean</code> is a simple JavaBean to represent label-value
pairs, especially useful for html option elements.
</p>
<hr>
<a name="doc.Utilities"></a>
<h3>Servlet Utilities</h3>
<p> The <code>RequestUtils</code> is a general purpose utility methods
related to processing a servlet request. The <code>ResponseUtils</code>
is a general purpose utility methods related to generating a servlet
response. The <code>ServletContextWriter</code> is a PrintWriter
implementation that uses the logging facilities of a
<code>javax.servlet.ServletContext</code> to output its results.
</p>
<hr>
<a name="doc.Messages"></a>
<h3>Message Resources</h3>
<h5>Background</h5>
<p>Modern applications often include the requirement to support multiple
languages, for users who prefer to interact in a language other than the
default language configured on the server platform. In addition, sentences
often need to be constructed, with dynamic content whose placement in the
message depends on the standard sentence structure in that particular
language.</p>
<p>The standard Java platform includes a family of classes
(<code>java.util.ResourceBundle</code>) designed to support looking up message
strings based on a standard "key". The resource bundle classes automatically
access a Java class (or properties file) that is named with a naming
convention that includes the Locale to which messages in that class (or file)
pertain. However, this selection is based only on the default Locale of the
server platform, and cannot be adjusted on a per-user basis as required for an
internationalized web application.</p>
<p>Struts includes a family of classes
(<code>org.apache.struts.util.MessageResources</code>) that extends the basic
approach to looking up message strings by key, allowing you to optionally
specify a Locale along with the key. In this way, you can build applications
that let your users select which Locale they wish to operate within, and then
look up messages in that language - using the same message keys no matter what
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