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create a Struts hello world application in eclipse.

First create a new project, go to File->New and select DynamicWebProject.

Enter the project name and click the Finish button.

Add the following jar files to the WEB-INF\lib directory.

Right click the src folder and select New->Package.

Enter the package name as com.vaannila.form and click Finish.

Now right click the newly created package 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 the following code.

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package com.vaannila.form;

 

import org.apache.struts.action.ActionForm;

 

public class HelloWorldForm extends ActionForm {

 

private static final long serialVersionUID = -473562596852452021L;

 

private String message;

 

public String getMessage() {

return message;

}

 

public void setMessage(String message) {

this.message = message;

}

}

In the same way create a new package com.vaannila.action and create a HelloWorldAction class extending org.apache.struts.action.Action. Add the following code to the action class and save it.

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package com.vaannila.action;

 

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

 

import com.vaannila.form.HelloWorldForm;

 

public class HelloWorldAction extends Action {

 

@Override

public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)throws Exception {

HelloWorldForm hwForm = (HelloWorldForm) form;

hwForm.setMessage("Hello World");

return mapping.findForward("success");

}

}

Here we typecast the ActionForm to HelloWorldForm and set the message value.

Add the following entries in the struts-config.xml file.

<?xml version="1.0" encoding="ISO-8859-1" ?>

 

<!DOCTYPE struts-config PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"

"http://struts.apache.org/dtds/struts-config_1_3.dtd">

 

<struts-config>

 

<form-beans>

<form-bean name="helloWorldForm"type="com.vaannila.form.HelloWorldForm"/>

</form-beans>

 

<global-forwards>

<forward name="helloWorld" path="/helloWorld.do"/>

</global-forwards>

 

<action-mappings>

<action path="/helloWorld"type="com.vaannila.action.HelloWorldAction"name="helloWorldForm">

<forward name="success" path="/helloWorld.jsp" />

</action>

</action-mappings>

 

</struts-config>

Now configure the deployment descriptor. Add the following configuration information in the web.xmlfile.

<?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/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"id="WebApp_ID" version="2.5">

<display-name>StrutsExample1</display-name>

 

<servlet>

<servlet-name>action</servlet-name>

<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

<init-param>

<param-name>config</param-name>

<param-value>/WEB-INF/struts-config.xml</param-value>

</init-param>

<load-on-startup>2</load-on-startup>

</servlet>

 

<servlet-mapping>

<servlet-name>action</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

 

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

</web-app>

When we run the application the index.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.<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

2.<logic:redirect forward="helloWorld"/>

In the action class we return the ActionForward "success" which is mapped to the helloWorld.jsp page. In the helloWorld.jsp page we display the "Hello World" message.

<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

<title>Hello World</title>

</head>

<body>

<bean:write name="helloWorldForm" property="message"/>

</body>

</html>