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There are two key roles for constants. First, they are used to override settings like the maximum file upload size or whether the Struts framework should be in "devMode" or not, and so on. Second, they specify which <a shape="rect" href="bean-configuration.html">Bean</a> implementation, among multiple implementations of a given type, should be chosen.</p><p>Constants can be declared in multiple files. By default, constants are searched for in the following order, allowing for subsequent files to override previous ones:</p><ol><li><a shape="rect" href="struts-defaultxml.html">struts-default.xml</a></li><li>struts-plugin.xml</li><li><a shape="rect" href="strutsxml.html">struts.xml</a></li><li><a shape="rect" href="strutsproperties.html">struts.properties</a></li><li><a shape="rect" href="webxml.html">web.xml</a></li></ol><p><img class="emoticon emoticon-warning" src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/images/icons/emoticons/warning.png"; data-emoticon-name="warning" alt="(warning)"> The <code>struts.properties</code> file is provided for backward-compatiblity with WebWork.</p><h2 id="ConstantConfiguration-Constant">Constant</h2><p>In the various XML variants, the constant element has two required attributes: <code>name</code> and <code>value</code>.</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"><p>Attribute</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Required</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p>name</p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><strong>yes</strong></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>the name of the constant</p></td></tr>< tr><td colspan="1" rowspan="1" class="confluenceTd"><p>value</p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><strong>yes</strong></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>the value of the constant</p></td></tr></tbody></table></div><p>In the <a shape="rect" href="strutsproperties.html">struts.properties</a> file, each entry is treated as a constant.</p><p>In the <a shape="rect" href="webxml.html">web.xml</a> file, any FilterDispatcher initialization parameters are loaded as constants.</p><h3 id="ConstantConfiguration-Valuesubstitution">Value substitution</h3><p>Since Apache Struts 2.5.6 it is possible to use value substitution when defining <code>constant</code>s in <code>struts.xml</code> file. You can also define a default value if given System property or ENV variable is missing, see example below:</p><div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl"> +<pre class="brush: xml; gutter: false; theme: Default" style="font-size:12px;"><struts> + <constant name="os" value="Current OS = ${os.name}"/> + + + <constant name="struts.devMode" value="${env.STRUTS_DEV_MODE:false}"/> +</struts></pre> +</div></div><p>Note: substitution is limited to System properties and ENV variables and works only for <code>constant</code>s (as for now).</p><h3 id="ConstantConfiguration-Sampleusage">Sample usage</h3><div class="code panel pdl" style="border-width: 1px;"><div class="codeHeader panelHeader pdl" style="border-bottom-width: 1px;"><b>Constant Example (struts.xml)</b></div><div class="codeContent panelContent pdl"> +<pre class="brush: xml; gutter: false; theme: Default" style="font-size:12px;"><struts> + + <constant name="struts.devMode" value="true" /> + + ... + +</struts> +</pre> +</div></div><div class="code panel pdl" style="border-width: 1px;"><div class="codeHeader panelHeader pdl" style="border-bottom-width: 1px;"><b>Constant Example (struts.properties)</b></div><div class="codeContent panelContent pdl"> +<pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">struts.devMode = true +</pre> +</div></div><div class="code panel pdl" style="border-width: 1px;"><div class="codeHeader panelHeader pdl" style="border-bottom-width: 1px;"><b>Constant Example (web.xml)</b></div><div class="codeContent panelContent pdl"> +<pre class="brush: xml; gutter: false; theme: Default" style="font-size:12px;"><web-app id="WebApp_9" version="2.4" + xmlns="http://java.sun.com/xml/ns/j2ee"; + xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; + xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> + + <filter> + <filter-name>struts</filter-name> + <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class> + <init-param> + <param-name>struts.devMode</param-name> + <param-value>true</param-value> + </init-param> + </filter> + + ... + +</web-app> +</pre> +</div></div></div> + </div> + + + </div> +</div> +<div class="footer"> + Generated by CXF SiteExporter +</div> +</body> +</html>
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+ document.all['children'] : + document.getElementById('children'); + if (children != null) { + children.style.display = 'none'; + show.style.display = 'inline'; + hide.style.display = 'none'; + } + } + + function showChildren() { + children.style.display = 'block'; + show.style.display = 'none'; + hide.style.display = 'inline'; + } + + function hideChildren() { + children.style.display = 'none'; + show.style.display = 'inline'; + hide.style.display = 'none'; + } + </script> + <title>Control Tags</title> +</head> +<body onload="init()"> +<table border="0" cellpadding="2" cellspacing="0" width="100%"> + <tr class="topBar"> + <td align="left" valign="middle" class="topBarDiv" align="left" nowrap> + <a href="home.html">Home</a> > <a href="guides.html">Guides</a> > <a href="tag-developers-guide.html">Tag Developers Guide</a> > <a href="struts-tags.html">Struts Tags</a> > <a href="tag-reference.html">Tag Reference</a> > <a href="generic-tag-reference.html">Generic Tag Reference</a> > <a href="control-tags.html">Control Tags</a> + </td> + <td align="right" valign="middle" nowrap> + <form name="search" action="https://www.google.com/search"; method="get"> + <input type="hidden" name="ie" value="UTF-8" /> + <input type="hidden" name="oe" value="UTF-8" /> + <input type="hidden" name="domains" value="" /> + <input type="hidden" name="sitesearch" value="" /> + <input type="text" name="q" maxlength="255" value="" /> + <input type="submit" name="btnG" value="Google Search" /> + </form> + </td> + </tr> +</table> + +<div id="PageContent"> + <div class="pageheader" style="padding: 6px 0px 0px 0px;"> + <!-- We'll enable this once we figure out how to access (and save) the logo resource --> + <!--img src="/wiki/images/confluence_logo.gif" style="float: left; margin: 4px 4px 4px 10px;" border="0"--> + <div style="margin: 0px 10px 0px 10px" class="smalltext">Apache Struts 2 Documentation</div> + <div style="margin: 0px 10px 8px 10px" class="pagetitle">Control Tags</div> + + <div class="greynavbar" align="right" style="padding: 2px 10px; margin: 0px;"> + <a href="https://cwiki.apache.org/confluence/pages/editpage.action?pageId=14108";> + <img src="https://cwiki.apache.org/confluence/images/icons/notep_16.gif"; + height="16" width="16" border="0" align="absmiddle" title="Edit Page"></a> + <a href="https://cwiki.apache.org/confluence/pages/editpage.action?pageId=14108";>Edit Page</a> + + <a href="https://cwiki.apache.org/confluence/pages/listpages.action?key=WW";> + <img src="https://cwiki.apache.org/confluence/images/icons/browse_space.gif"; + height="16" width="16" border="0" align="absmiddle" title="Browse Space"></a> + <a href="https://cwiki.apache.org/confluence/pages/listpages.action?key=WW";>Browse Space</a> + + <a href="https://cwiki.apache.org/confluence/pages/createpage.action?spaceKey=WW&fromPageId=14108";> + <img src="https://cwiki.apache.org/confluence/images/icons/add_page_16.gif"; + height="16" width="16" border="0" align="absmiddle" title="Add Page"></a> + <a href="https://cwiki.apache.org/confluence/pages/createpage.action?spaceKey=WW&fromPageId=14108";>Add Page</a> + + <a href="https://cwiki.apache.org/confluence/pages/createblogpost.action?spaceKey=WW&fromPageId=14108";> + <img src="https://cwiki.apache.org/confluence/images/icons/add_blogentry_16.gif"; + height="16" width="16" border="0" align="absmiddle" title="Add News"></a> + <a href="https://cwiki.apache.org/confluence/pages/createblogpost.action?spaceKey=WW&fromPageId=14108";>Add News</a> + </div> + </div> + + <div class="pagecontent"> + <div class="wiki-content"> + <div id="ConfluenceContent"> +<p>Controls tags provide the ability to manipulate collections and conditionally produce content.</p> +<div class="confluence-information-macro confluence-information-macro-note"><span class="aui-icon aui-icon-small aui-iconfont-warning confluence-information-macro-icon"></span><div class="confluence-information-macro-body"><p>Please make sure you have read the <a shape="rect" href="tag-syntax.html">Tag Syntax</a> document and understand how tag attribute syntax works.</p></div></div> +<ol><li><a shape="rect" href="if.html">if</a></li><li><a shape="rect" href="elseif.html">elseIf / elseif</a></li><li><a shape="rect" href="else.html">else</a></li><li><a shape="rect" href="append.html">append</a></li><li><a shape="rect" href="generator.html">generator</a></li><li><a shape="rect" href="iterator.html">iterator</a></li><li><a shape="rect" href="merge.html">merge</a></li><li><a shape="rect" href="sort.html">sort</a></li><li><a shape="rect" href="subset.html">subset</a></li></ol> + + +<p>@see src/META-INF/taglib.tld </p> + +<h2 id="ControlTags-Next:">Next: <a shape="rect" class="createlink" href="https://cwiki.apache.org/confluence/pages/createpage.action?spaceKey=test&title=Data+Tags";>Data Tags</a></h2></div> + </div> + + + </div> +</div> +<div class="footer"> + Generated by CXF SiteExporter +</div> +</body> +</html>
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