Struts Hello World Example in Eclipse
06.13.2012
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File Source : http://www.dzone.com/tutorials/java/struts/struts-tutorial/struts-tutorial-using-eclipse-1.html
In this tutorial you will learn howto create a Struts hello world application in eclipse. First create a newproject, go to File->New and select
DynamicWebProject. 
Enter the project name and clickthe Finish button.
Right click the src folder andselect New->Package.
Enter the package name as com.vaannila.form and click Finish.
Now right click the newly createdpackage and select New->Class.
Enter the class name as HelloWorldForm and the superclass name asorg.apache.struts.action.ActionForm and click Finish.
In the HelloWorldForm class add thefollowing code.
01.package com.vaannila.form;
02.
03.import org.apache.struts.action.ActionForm;
04.
05.public class HelloWorldForm extends ActionForm {
06.
07.private static final long serialVersionUID = -473562596852452021L;
08.
09.private String message;
10.
11.public String getMessage() {
12.return message;
13.}
14.
15.public void setMessage(String message) {
16.this.message = message;
17.}
18.}
In the same way create a newpackage com.vaannila.action and create a HelloWorldAction class extending org.apache.struts.action.Action. Add the following code to theaction class and save it.
01.package com.vaannila.action;
02.
03.import javax.servlet.http.HttpServletRequest;
04.import javax.servlet.http.HttpServletResponse;
05.
06.import org.apache.struts.action.Action;
07.import org.apache.struts.action.ActionForm;
08.import org.apache.struts.action.ActionForward;
09.import org.apache.struts.action.ActionMapping;
10.
11.import com.vaannila.form.HelloWorldForm;
12.
13.public class HelloWorldAction extends Action {
14.
15.@Override
16.public ActionForward execute(ActionMapping mapping, ActionFormform, HttpServletRequest request, HttpServletResponse response) throwsException {
17.HelloWorldForm hwForm = (HelloWorldForm) form;
18.hwForm.setMessage("Hello World");
19.return mapping.findForward("success");
20.}
21.}
Here we typecast the ActionForm to HelloWorldForm and set the message value.
Add the following entries in the struts-config.xml file.
01.<?xml version="1.0" encoding="ISO-8859-1" ?>
02.
03.<!DOCTYPE struts-config PUBLIC
04."-//Apache Software Foundation//DTD StrutsConfiguration 1.3//EN"
05."http://struts.apache.org/dtds/struts-config_1_3.dtd">
06.
07.<struts-config>
08.
09.<form-beans>
10.<form-bean name="helloWorldForm"type="com.vaannila.form.HelloWorldForm"/>
11.</form-beans>
12.
13.<global-forwards>
14.<forward name="helloWorld" path="/helloWorld.do"/>
15.</global-forwards>
16.
17.<action-mappings>
18.<action path="/helloWorld"type="com.vaannila.action.HelloWorldAction" name="helloWorldForm">
19.<forward name="success" path="/helloWorld.jsp" />
20.</action>
21.</action-mappings>
22.
23.</struts-config>
Now configure the deploymentdescriptor. Add the following configuration information in the web.xml file.
01.<?xml version="1.0" encoding="UTF-8"?>
02.<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/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID"version="2.5">
03.<display-name>StrutsExample1</display-name>
04.
05.<servlet>
06.<servlet-name>action</servlet-name>
07.<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
08.<init-param>
09.<param-name>config</param-name>
10.<param-value>/WEB-INF/struts-config.xml</param-value>
11.</init-param>
12.<load-on-startup>2</load-on-startup>
13.</servlet>
14.
15.<servlet-mapping>
16.<servlet-name>action</servlet-name>
17.<url-pattern>*.do</url-pattern>
18.</servlet-mapping>
19.
20.<welcome-file-list>
21.<welcome-file>index.jsp</welcome-file>
22.</welcome-file-list>
23.</web-app>
When we run the application theindex.jsp page will be executed first. In the index.jsp page we redirect the request to the helloWorld.do URI, which inturn invokes the HelloWorldAction.
1.<%@ tagliburi="http://struts.apache.org/tags-logic" prefix="logic" %>
2.<logic:redirect forward="helloWorld"/>
In the action class we return theActionForward "success" which is mapped to the helloWorld.jsp page. In the helloWorld.jsp page we display the "HelloWorld" message.
01.<%@taglib uri="http://struts.apache.org/tags-bean"prefix="bean" %>
02.<html>
03.<head>
04.<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
05.<title>Hello World</title>
06.</head>
07.<body>
08.<bean:write name="helloWorldForm" property="message"/>
09.</body>
10.</html>
After creating all the files thedirectory structure of the application looks like this.
On executing the application the"Hello World" message gets displayed to the user.
You can download the source code ofthis example by clicking on the Download link below.
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