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Developing Hello World application
Posted on: November 23, 2010 at 12:00 AM
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In this tutorial you will learn how to configure and run the struts application

Hello World Example

A Hello World Example given below which shows the basic flow of Struts 2.2.1. Let us illustrates how to write java class and configure the file one by one.
The Package hierarchy of the given application is as follows. So you are recommended to follow this hierarchy.

index.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>RoseIndia.net Struts Tutorials</title>
</head>
<body>
<p>Browser the following link to run the example</p>
<b>Hello World Example</b><br>
<a href="roseindia/HelloWorld.action?request_locale=en">Hello World in English</a><br>
<a href="roseindia/HelloWorld.action?request_locale=es">Hello World in Espanol</a><br>
&nbsp;<br>
<b>Form Examples</b><br>
<a href="roseindia/showLogin.action">Login Form</a>
</body>
</html>
Save the index.html into struts221 application

HelloWorld.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title><s:text name="HelloWorld.message"/></title>
</head>

<body>
<h2><s:property value="message"/></h2>
<br>
<a href="/struts221/">Back to Index page</a>
</body>
</html>
login.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Struts 2 Login Application!</title>

<link href="<s:url value="/css/main.css"/>" rel="stylesheet"
type="text/css"/>

</head>
<body>
<s:form action="doLogin" method="POST"> 
<tr>
<td colspan="2">
Login
</td>
</tr>
<tr>
<td colspan="2">
<s:actionerror />
<s:fielderror />
</td>
</tr>
<s:textfield name="username" label="Login name"/>
<s:password name="password" label="Password"/>
<s:submit value="Login" align="center"/> 
</s:form>
<br>
<a href="/struts221/">Back to Index page</a>
</body>
</html>
loginsuccess.jsp
<html>

<head>
<title>Login Success</title>
</head>

<body>

<p align="center"><font color="#000080" size="5">Login Successful</font></p>


<br>
<a href="/struts221/">Back to Index page</a>

</body>

</html>

HelloWorld.java

package net.roseindia;

import com.opensymphony.xwork2.ActionSupport;

public class HelloWorld extends ActionSupport {

    public String execute() throws Exception {
        setMessage(getText(MESSAGE));
		System.out.println("\nHello World Action Called");
        return SUCCESS;
    }

   public static final String MESSAGE = "HelloWorld.message";

   private String message;

    public String getMessage() {
        return message;
    }

   public void setMessage(String message) {
        this.message = message;
    }
}
Save the HelloWorld.java file into roseindia directory.

Login.java

package net.roseindia;
import com.opensymphony.xwork2.ActionSupport;
import java.util.Date;
public class Login extends ActionSupport {


public String execute() throws Exception {
System.out.println("Login Action Called");
if(!getUsername().equals("Admin") || !getPassword().equals("Admin")){
addActionError(getText("Login.invalidLogin"));
return ERROR;
}else{
return SUCCESS;
}
}
private String username = null;
public String getUsername() {
return username;
}
public void setUsername(String value) {
username = value;
}
private String password = null;
public String getPassword() {
return password;
}
public void setPassword(String value) {
password = value;
}
}
Save the Login.java file into roseindia directory.

Now wite the properties file as

package.properties

HelloWorld.message= This Is Hello World
Login.invalidLogin=Invalid user name or password! Please try again!
requiredstring = ${getText(fieldName)} is required.

package_es.properties

HelloWorld.message= Hola a todos
Login.invalidLogin= Invalid login name
requiredstring = ${getText(fieldName)} is required.
Now configure the struts.xml file as

struts.xml

<?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" />
<package name="roseindia" namespace="/roseindia" extends="struts-default">

<action name="HelloWorld" class="net.roseindia.HelloWorld">
<result>/jsp/HelloWorld.jsp</result>
</action>

<!-- Login Form Configuration -->
<action name="showLogin">
<result>/jsp/login.jsp</result>
</action>

<action name="doLogin" class="net.roseindia.Login">
<result name="input">/jsp/login.jsp</result>
<result name="error">/jsp/login.jsp</result>
<result>/jsp/loginsuccess.jsp</result>
</action>
</package>
</struts>

Login-validation.xml

<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<validators>
<field name="username">
<field-validator type="requiredstring">
<message key="requiredstring"/>
</field-validator>
</field>
<field name="password">
<field-validator type="requiredstring">
<message key="requiredstring"/>
</field-validator>
</field>
</validators>
Save this struts.xml into the java directory and Login-validation.xml into roseindia directory and then configure the buld.xml file as

 build.xml
<project name="Struts 2 Tutorial" basedir="../" default="all">

<!-- Project settings -->
<property name="project.jar.file" value="HelloWorldExample.jar"/>

<path id="class.path">
<fileset dir="lib">
<include name="**/*.jar"/>
</fileset>
<fileset dir="libext">
<include name="**/*.jar"/>
</fileset>
</path>

<!-- Classpath for Project -->
<path id="compile.classpath">
<pathelement path ="lib/commons-beanutils.jar"/>
<pathelement path ="lib/commons-digester.jar"/>
<pathelement path ="lib/struts.jar"/>
<pathelement path ="libext/servlet-api.jar"/>
<pathelement path ="libext/catalina-ant.jar"/>
<pathelement path ="classes"/>
<pathelement path ="${classpath}"/>
</path>

<!-- Check timestamp on files -->
<target name="prepare">
<tstamp/>
<!--
<copy
file="src/java/struts.xml"
todir="src/classes"/>
-->
</target>

<!-- Copy any resource or configuration files -->
<target name="resources">
<copy todir="\classes" includeEmptyDirs="no">
<fileset dir="src/java">
<patternset>
<include name="**/*.conf"/>
<include name="**/*.properties"/>
<include name="**/*.xml"/>
</patternset>
</fileset>
</copy>
</target>

<!-- Normal build of application -->
<target name="compile" depends="prepare,resources">
<javac srcdir="src" destdir="src/classes" debug="true" debuglevel="lines,vars,source">
<classpath refid="class.path"/>
</javac>
<jar
jarfile="lib/${project.jar.file}"
basedir="src/classes"/>
</target>

<!-- Remove classes directory for clean build -->
<target name="clean"
description="Prepare for clean build">
<delete dir="src/classes"/>
<mkdir dir="src/classes"/>
</target>

<!-- Build entire project -->
<target name="project" depends="clean,prepare,compile"/>

<!-- Build project and create distribution-->
<target name="all" depends="project"/>

</project>
and save into the src directory
Now configure the ant path into your windows environment varible.And and open the command prompt go to the src directory of the application and type ant, this will build you application and save it to the lib directory named HelloWorldExample.jar. After that start your tomcat open the browser and type the URL http://localhost:8080/helloworld you will get the following output
 
 
 

Download Example Source Code


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