Coding Style In C,C++,Java,VB,C#,JQuery,SQL: May 2014

In this tutorial you will learn how to 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.

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.

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) throwsException {

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" ?>

 



"-//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.jsppage. 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>

After creating all the files the directory structure of the application looks like this.

On executing the application the "Hello World" message gets displayed to the user.

Coding Style In C,C++,Java,VB,C#,JQuery,SQL

Wednesday, May 14, 2014

Struts Hello World Example in Eclipse

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