📄 logic.jsp
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<%@ page language="java" contentType="text/html; charset=UTF-8" %>
<%@ page import="org.apache.struts.action.ActionErrors" %>
<%@ page import="org.apache.struts.action.ActionMessages" %>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<html:html xhtml="true" lang="true">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Logic Tags Example</title>
<html:base />
<link rel="stylesheet" type="text/css" href="../../css/example.css" />
</head>
<body>
<html:link page="/jsp/logic/source.jsp">
<img src="../../images/code.gif" width="24" height="24" alt="View Source" class="icon" />
</html:link>
<a href="../../index.jsp"><img src="../../images/return.gif" height="24" width="24" alt="Return to examples page" class="icon" /></a>
<h1>Logic Tags Example</h1>
<hr noshade="noshade"/>
<h2>Present / Not Present</h2>
<h3>Cookie</h3>
<logic:present cookie="JSESSIONID">
<p>Session cookie is present.</p>
</logic:present>
<logic:notPresent cookie="UNKNOWN">
<p>UNKNOWN cookie is not present.</p>
</logic:notPresent>
<h3>Parameter</h3>
<logic:present parameter="param">
<bean:parameter name="param" id="test"/>
<p><bean:write name="test"/></p>
</logic:present>
<logic:notPresent parameter="param">
<p>Parameter 'param' not present.
<html:link action="/prepareLogic?param=The parameter is present">
Redisplay page with parameter present.
</html:link>
</p>
</logic:notPresent>
<h3>Bean</h3>
<logic:present name="testBean">
<p>'testBean' is present.</p>
</logic:present>
<logic:notPresent name="anotherTestBean">
<p>'anotherTestBean' is not present.</p>
</logic:notPresent>
<logic:present name="testBean" property="fred">
<p>'fred' property is present on 'testBean'</p>
</logic:present>
<logic:notPresent name="testBean" property="fred">
<p>'fred' property is not present on 'testBean'</p>
</logic:notPresent>
<logic:present name="testBean" property="stringValue">
<p>'stringValue' property is present on 'testBean'</p>
</logic:present>
<h2>Empty / Not Empty</h2>
<logic:present name="items">
<p>'items' was found.</p>
</logic:present>
<logic:empty name="items">
<p>'items' is empty</p>
</logic:empty>
<logic:notEmpty name="items">
<p>'items' is not empty</p>
<%-- <bean:size collection="items" id="itemsSize"/>
<p>Items has <bean:write name="itemsSize" /> items.</p>
--%>
</logic:notEmpty>
<h2>Comparison tags</h2>
<logic:equal name="intValue" value="7">
<p>intValue == 7</p>
</logic:equal>
<logic:greaterEqual name="intValue" value="7">
<p>intValue >= 7</p>
</logic:greaterEqual>
<logic:greaterEqual name="intValue" value="6">
<p>intValue >= 6</p>
</logic:greaterEqual>
<logic:greaterThan name="intValue" value="6">
<p>intValue > 6</p>
</logic:greaterThan>
<logic:lessEqual name="intValue" value="7">
<p>intValue <= 7</p>
</logic:lessEqual>
<logic:lessEqual name="intValue" value="8">
<p>intValue <= 8</p>
</logic:lessEqual>
<logic:lessThan name="intValue" value="8">
<p>intValue < 8</p>
</logic:lessThan>
<logic:match name="stringValue" value="world">
<p>stringValue matches 'world'</p>
</logic:match>
<logic:notMatch name="stringValue" value="earth">
<p>stringValue does not match 'earth'</p>
</logic:notMatch>
<logic:notMatch name="stringValue" value="world">
<p>stringValue does not match 'world'</p>
</logic:notMatch>
<h2>Iteration</h2>
<h4>Book list:</h4>
<ol>
<logic:iterate name="books" id="book" indexId="index">
<li><bean:write name="book" property="title"/></li>
</logic:iterate>
</ol>
<h4>Book list (entries 3-5):</h4>
<ol start="3">
<logic:iterate name="books" id="book" offset="2" length="3">
<li><bean:write name="book" property="title"/></li>
</logic:iterate>
</ol>
<h2>Checking for and displaying messages</h2>
<h3>Errors:</h3>
<logic:messagesPresent>
<p>Global errors:</p>
<ul>
<html:messages id="error" property="<%=ActionErrors.GLOBAL_MESSAGE%>">
<li><bean:write name="error"/></li>
</html:messages>
</ul>
<p>Errors for 'test':</p>
<ul>
<html:messages id="error" property="test">
<li><bean:write name="error"/></li>
</html:messages>
</ul>
</logic:messagesPresent>
<logic:messagesNotPresent>
<p>There are no errors</p>
</logic:messagesNotPresent>
<h3>Messages:</h3>
<logic:messagesPresent message="true">
<ul>
<html:messages id="msg" message="true" property="<%=ActionMessages.GLOBAL_MESSAGE%>">
<li><bean:write name="msg"/></li>
</html:messages>
</ul>
<p>Messages for 'test':</p>
<ul>
<html:messages id="msg" property="test" message="true">
<li><bean:write name="msg"/></li>
</html:messages>
</ul>
</logic:messagesPresent>
<logic:messagesNotPresent message="true">
<p>There are no messages</p>
</logic:messagesNotPresent>
</body>
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