Dinesh on Java

Struts2

Struts 2 Url Tag Example

In this tutorial, We will discuss about the URL tag in struts2. This tag is used to create an URL and output it as a text format. It is never work by itself, but it can provides URL to other tags like <s:a> to create a hyperlink or <img> to render an image.

The url tag is responsible for generating URL strings. The advantage of this is that you can supply parameters to the tag. Let us go through an example to show the usage of url tag.

Create action classes:

package com.dineshonjava.struts2.action;

import com.opensymphony.xwork2.ActionSupport;

/**
 * @author Dinesh Rajput
 *
 */
public class DataTagAction extends ActionSupport {

 private static final long serialVersionUID = -7744420104547018874L;
 private String name;
 
 public String execute() {
  return SUCCESS;
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }
  
}

Create views
Let us have success.jsp with the following content:

<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<STYLE type="text/css">

b{color: blue;}

</STYLE>
<title>Text Data Tag Struts2 | dineshonjava.com</title>
</head>
<body>
   <h1><span style="background-color: #FFFFcc">Text Data Tags Example!</span></h1>
   <ol>
  <li>Image URL Here:<br>
   <a href="https://www.dineshonjava.com"><img src="<s:url value="http://2.bp.blogspot.com/-rBLnvKuVDO0/UWBnJJ4n1yI/AAAAAAAADCQ/Vh_cVJ34JFw/s1600/new-logo.png" /> " /></a>
  </li>

  <li>Simple URL Here:<br>
   <a href="<s:url value="https://www.dineshonjava.com" />">Dieshonjava</a>
  </li>

  <li>
   <s:url action="URLtag.action" var="URLtag">
    <s:param name="name">Dineshonjava</s:param>
   </s:url> 
   <a href="<s:property value="#URLtag" />">URL Tag Action (via property)</a>
  </li>

  <li>
   <s:url action="URLtag.action" var="URLtag">
    <s:param name="name">Dinesh Rajput</s:param>
   </s:url> 
   <s:a href="%{URLtag}">URL Tag Action (via %)</s:a>
  </li>
 </ol>
</body>
</html>

Configuration Files
Your struts.xml should look like:

<?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="urltag" class="com.dineshonjava.struts2.action.DataTagAction">
            <result name="success">/success.jsp</result>
        </action>
    </package>
 </struts>

Your web.xml should look like:

<?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>Struts2DataTag</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>

Right click on the project name and click Export > WAR File to create a War file. Then deploy this WAR in the Tomcat’s webapps directory. Finally, start Tomcat server and try to access

URL http://localhost:8080/doj/urltag.

This will give you following screen:

Download Source Code
URLDataTagExample.zip

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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!