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Struts 2 Login Application XML Based Example

By Arvind Rai, May 08, 2014
In this page, we will learn how to create an application in Struts 2 using XML configuration. For the example we have taken a login application. Struts 2 applications can be created annotation based and xml based. In xml based application, the actions and responses are configured in struts.xml. The JSP page which needs to be redirected after run the action is also configured in struts.xml.

Software Used

To create and run the demo we have used below software.
1. JDK 6
2. Eclipse
3. Tomcat 7

Define struts.xml

In struts.xml, within the <struts> tag define the namespace, action class and jsp pages which will be redirected.
struts.xml
<struts>
 	<package name="user" namespace="/user" extends="struts-default">
		<action name="login">
			<result>login.jsp</result>
		</action>
		<action name="result" class="com.concretepage.action.ResultAction">
			<result name="SUCCESS">result.jsp</result>
			<result name="ERROR">error.jsp</result>
		</action>
	</package>
</struts> 



Configure web.xml to Support Struts 2

Create web.xml for struts 2. Configure StrutsPrepareAndExecuteFilter so that request and responses can be filtered according to struts application.
web.xml
<web-app>
  <display-name>Struts 2 Example</display-name>
   <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
  <filter-mapping>
	<filter-name>struts2</filter-name>
	<url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app> 

Create Action Class

I have created one action class ResultAction.java which consists two property and a method as execute(). The properties are used to populate data from jsp. Execute method is the method from where action class starts executing.
ResultAction.java
package com.concretepage.action;
public class ResultAction {
	private String userName;
	private String pwd;
	public String execute() {
		if(getUserName() !=null && getUserName().equals(getPwd())){
		   return "SUCCESS";
		}else{
			return "ERROR";
		}
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getPwd() {
		return pwd;
	}
	public void setPwd(String pwd) {
		this.pwd = pwd;
	}
} 

Create JSP pages

Find login.jsp which will be displayed first on accessing the demo. The properties defined in action class and input fields name of jsp must match in their name.
login.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head></head>
<body>
<h1>Struts 2 Example</h1>
<s:form action="result">
	<s:textfield name="userName" label="User Name"/>
	<s:password name="pwd" label="Password"/>
	<s:submit/>
</s:form>
</body>
</html> 
Find result.jsp which will display data when login is successful. Using properties of action class, values can be fetched on JSP.
result.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head></head>
<body>
<h1>Struts 2 Example</h1>
<h4>Your User Name is:  <s:property value="userName"/></h4>
</body>
</html> 
Find error.jsp which will display message when login not successful.
error.jsp
<html>
<head></head>
<body>
<h1>Struts 2 Example</h1>
<h4> You are not authorized for the application. </h4>
</body>
</html>  

Eclipse Configuration used in Struts 2 Application

I have configured login application in eclipse in below structure.
Struts 2 Login Application XML Based Example

Maven Dependency for Struts 2

Find the maven dependency for struts 2.
pom.xml
<dependencies>
	<dependency>
		<groupId>org.apache.struts</groupId>
		<artifactId>struts2-core</artifactId>
		<version>2.3.16</version>
	</dependency>
	<dependency>
		<groupId>org.apache.struts</groupId>
		<artifactId>struts2-convention-plugin</artifactId>
		<version>2.3.8</version>
	</dependency>
</dependencies>	 

Output Screen

Use URL http://localhost:8080/Struts2-1/user/login to run the application. Find the Login Page. Enter any username and enter password same word used as user name, then we will get success page and if differ will get un authorization page. Find output screen.
Struts 2 Login Application XML Based Example

Download Source Code

POSTED BY
ARVIND RAI
ARVIND RAI
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