<div dir="ltr" style="text-align: justify;" trbidi="on">
<div dir="ltr" style="text-align: justify;" trbidi="on">
<div dir="ltr" style="text-align: justify;" trbidi="on">The subset tag is a generic tag is used to output a subset or portion of an iterator elements. The following Example will shows how to implement the subset tag in the Struts2. ;</p>
<p>First we create a JSP file named <i><b>subsettag.jsp</b></i> as follows.</p>
<p>Now create a jsp page using <b><;s:subset>;</b> and <b><;s:iterator>;</b> tags as shown in the <b>SubsetTag.jsp</b> page. The subset tag takes an iterator and outputs a subset of it. The parameter count is of integer type and it sets the number of entries to be kept in the resulting subset iterator. </p>
<pre class="highlight" name="code"><;%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
 pageEncoding="ISO-8859-1"%>; 
 <;%@ taglib prefix="s" uri="/struts-tags"%>; 
<;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">; 
<;html>; 
<;head>; 
<;meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">; 
 <;title>;Subset Control Tag Struts2 | dineshonjava.com<;/title>; 
<;/head>; 
<;body>; 
 <;h1>;<;span style="background-color: #FFFFcc">;Subset Tag Example! | dineshonjava.com 
 <;/span>;<;/h1>; 
 <;b>;The Subset of first 2 values :<;/b>; 
 <;s:subset source="userList" count="2">; 
 <;ol>; 
 <;s:iterator>; 
 <;li>; 
 <;s:property value="userId" />; , 
 <;s:property value="userName" />; , 
 <;s:property value="age" />; 
 <;/li>; 
 <;/s:iterator>; 
 <;/ol>;<;br>; 
 <;/s:subset>; 
<;b>;The Subset of 2 values starting from 3rd index :<;/b>; 
 <;s:subset source="userList" start="2" count="2">; 
 <;ol>; 
 <;s:iterator>; 
 <;li>; 
 <;s:property value="userId" />; , 
 <;s:property value="userName" />; , 
 <;s:property value="age" />; 
 <;/li>; 
 <;/s:iterator>; 
 <;/ol>;<;br>; 
 <;/s:subset>; 
 <;/body>; 
<;/html>; 
</pre>
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<p><b>The Struts mapping file <i>Struts.xml</i> is as follows-</b></p>
<pre class="highlight" name="code"><;?xml version="1.0" encoding="UTF-8" ?>; 
<;!DOCTYPE struts PUBLIC 
 "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" 
 "http://struts.apache.org/dtds/struts-2.0.dtd">; 
 
<;struts>; 
 <;constant name="struts.enable.DynamicMethodInvocation" value="false" />; 
 <;constant name="struts.devMode" value="false" />; 
 <;constant name="struts.custom.i18n.resources" value="myapp" />; 
 
 <;package name="default" extends="struts-default" namespace="/">; 
 <;action name="subsettag" class="com.dineshonjava.struts2.action.ControlTagAction">; 
 <;result name="success">;/subsettag.jsp<;/result>; 
 <;/action>; 
 
 <;/package>; 
 <;/struts>; 
</pre>
<p><b>Create action class:</b></p>
<p> The action class <i><b>ControlTagAction.java</b></i> is as follows.</div>
<pre class="highlight" name="code">package com.dineshonjava.struts2.action; 
 
import java.util.ArrayList; 
import java.util.List; 
 
import com.dineshonjava.struts2.domain.User; 
import com.opensymphony.xwork2.ActionSupport; 
 
/** 
 * @author Dinesh Rajput 
 * 
 */ 
public class ControlTagAction extends ActionSupport{ 
 
 private static final long serialVersionUID = 1L; 
 
 private List<;User>; userList = new ArrayList<;User>;(); 
 
 public String execute() { 
 
 User user1 = new User(); 
 user1.setAge(27); 
 user1.setUserId(111); 
 user1.setUserName("Dinesh Rajput"); 
 
 User user2 = new User(); 
 user2.setAge(25); 
 user2.setUserId(222); 
 user2.setUserName("Anamika Rajput"); 
 
 User user3 = new User(); 
 user3.setAge(23); 
 user3.setUserId(333); 
 user3.setUserName("Aadesh"); 
 
 User user4 = new User(); 
 user4.setAge(21); 
 user4.setUserId(444); 
 user4.setUserName("Vinesh Rajput"); 
 
 userList.add(user1); 
 userList.add(user2); 
 userList.add(user3); 
 userList.add(user4); 
 
 return SUCCESS; 
 } 
 
 public List<;User>; getUserList() { 
 return userList; 
 } 
 
 
 public void setUserList(List<;User>; userList) { 
 this.userList = userList; 
 } 
} 
</pre>
<p><b>Create<i> web.xml</i> file as below.</b></p>
<pre class="highlight" name="code"><;?xml version="1.0" encoding="UTF-8"?>; 
<;web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">; 
 <;display-name>;Struts2ControlTags<;/display-name>; 
 <;filter>; 
 <;filter-name>;struts2<;/filter-name>; 
 <;filter-class>; 
 org.apache.struts2.dispatcher.FilterDispatcher 
 <;/filter-class>; 
 <;/filter>; 
 <;filter-mapping>; 
 <;filter-name>;struts2<;/filter-name>; 
 <;url-pattern>;/*<;/url-pattern>; 
 <;/filter-mapping>; 
 <;welcome-file-list>; 
 <;welcome-file>;index.jsp<;/welcome-file>; 
 <;/welcome-file-list>; 
<;/web-app>; 
</pre>
<p>
Right click on the project name and click <b>Export >; WAR</b> File to create a War file. Then deploy this WAR in the Tomcat&#8217;s webapps directory. Finally, start Tomcat server and try to access </p>
<p> <b>URL <i>http://localhost:8080/doj/subsettag.</i></b></p>
<p> This will give you following screen:</p>
<div class="separator" style="clear: both; text-align: center;"><img border="0" src="https://dineshonjava.com/wp-content/uploads/2013/08/2222-1.png"/></div>
</div>
<p>
<b>Download Source Code</b><br />
<b><a href="https://sites.google.com/a/dineshonjava.com/dineshonjava/dineshonjava/Struts2SubsetTags.zip?attredirects=0&;d=1" target="_blank">Struts2SUbsetTag.zip</a></b></p>
<p></p>
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