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Struts2.2.1 generator Tag Example
Posted on: December 30, 2010 at 12:00 AM
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Struts 2 generator tag is used to generate an iterator based on the ?val? attribute provided in the page.

Struts2.2.1 generator Tag Example

Struts 2 generator tag is used to generate an iterator based on the ?val? attribute provided in the page.The generator tag is a generic tag that is used to generate iterators based on different attributes passed. In this tutorials, you will use Struts 2 generator tag to do the following tasks :

  • Create an iterator with generator tag.
  • Create an iterator with generator tag and modify the iterator value with the ?Converter? object.

The following Example will shows how to implement the generator tag in the Struts2.2.1 --

First we create a JSP file named generator.jsp as follows.

A JSP page to show the use of generator tag to create a iterator dynamically. The ?separator? attribute is required, which separating the val into the entries of the iterator. The ?converter? attribute is optional, which allow you to modify the value. the <s:generator> generates a simple iterator based on the val attribute supplied and <s:iterator> tag prints it out using the <s:property /> tag.

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<%@ taglib prefix="s" uri="/struts-tags" %>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<s:generator separator="," val="%{'Gyan,Arun,Ankit,Rohit'}" >

<s:iterator >

<s:property/><br/>

</s:iterator>

</s:generator>

</body>

</html>

The index.jsp file is as follows- This file only contains the hiperlink only.

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<!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=UTF-8">

<title>Insert title here</title>

</head>

<body>

This is my jsp.

<a href="GeneratorTag.action">Generator tag</a>

</body>

</html>

The Struts mapping file Struts.xml is as follows-

<?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="ApplicationResources" />

<package name="default" namespace="/" extends="struts-default">

<action name="GeneratorTag" class="roseindia.GeneratorTag">

<result name="success">/generator.jsp</result>

</action>

</package>

</struts>

The web config file web.xml is as follows-

<?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_2_5.xsd"

id="WebApp_ID" version="2.5">

<display-name>GeneratorTag</display-name>

<filter>

<filter-name>struts2</filter-name>

<filter-class>

org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</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>

The action class GeneratorTag.java is as follows.

package roseindia;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.util.IteratorGenerator.Converter;

public class GeneratorTag extends ActionSupport {

public String execute() throws Exception {

return SUCCESS;
}
}

This Program produces output on the basis of the generator tag evaluation, This  give the output as-

Output:-

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