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Struts2.2.1 param Tag Example
Posted on: January 7, 2011 at 12:00 AM
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In this tutorial, We will discuss about the param tag in struts 2.2.1.

Struts2.2.1 param Tag Example

This tag can be used to parameterize other tags.The parameters can be added with or without a name as key. when we declare the param tag, the value can be defined in either a value attribute or as text between the start and end tag. Struts behaves a bit different according to these two situations.

This tag has the following two paramters.

name (String) - the name of the parameter
value (Object) - the value of the parameter

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

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

<%@ 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>Example of Param Tag</title>

</head>

<body>

<s:bean name="roseindia.ParamTag" var="paramTag">

<s:param name="name">Gyan Singh</s:param>

<s:param name="age">25</s:param>

<s:param name="status">Single</s:param>

<s:param name="birthday">1st March</s:param>

</s:bean>

<ol>

<li>Name : <s:property value="#paramTag.name" /></li>

<li>Age : <s:property value="#paramTag.age" /></li>

<li>Status : <s:property value="#paramTag.status" /></li>

<li>Birthday : <s:property value="#paramTag.birthday" /></li>

</ol>

</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"
>

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

<html>

<head>

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

<title>Example of Param Tag</title>

</head>

<body>

<a href="ParamTag.action">Example of param 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="ParamTag" class="roseindia.ParamTag">

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

</action>

</package>

</struts>

The action class ParamTag.java is as follows.

package roseindia;

import com.opensymphony.xwork2.ActionSupport;

public class ParamTag extends ActionSupport {

private String name;

private String age;

private String status;

private String birthday;

public String execute() throws Exception {

return SUCCESS;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getAge() {

return age;

}

public void setAge(String age) {

this.age = age;

}

public String getStatus() {

return status;

}

public void setStatus(String status) {

this.status = status;

}

public String getBirthday() {

return birthday;

}

public void setBirthday(String birthday) {

this.birthday = birthday;

}

}

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

Output:-

Download Select Source Code


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