Struts2 action pojo example

As we discussed in earlier tutorials that any POJO class can be used as action class in struts 2. Only requirement is that it must have one no-argument method that returns a String or Result object. The execute() method is used by default if no-argument method is not there.

Example:

login.jsp

<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
	<head>
		<title>Struts 2 action example using POJO class.</title>
	</head>
	<body>
		<h3>This is an action example using POJO class.</h3>
 
		<s:property value="message" /> <br/>
 
		<s:form action="Login">
			<s:textfield name="userName" label="UserName" />
			<s:password name="password" label="Password" />
			<s:submit value="login" align="center"/>
		</s:form>
 
	</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 
 
 	<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>
 
	<welcome-file-list>
	  <welcome-file>login.jsp</welcome-file>
	</welcome-file-list>
 
</web-app>

struts.xml

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>
 
 <package name="user" extends="struts-default">
   <action name="Login" class="com.w3spoint.action.Login">
	  <result name="success">/welcome.jsp</result>
	  <result name="error">/login.jsp</result>
   </action>
  </package>
 
</struts>

Login.java

/**
 * This class is used as an action class.
 * @author w3spoint
 */
public class Login {
	//data members
	private String userName;
	private String password;
	private String message;
 
	//business logic
	public String execute(){
		if(userName.equals("jai") &&
				password.equals("1234")){
			setMessage("Hello " +userName + "," +
				" You are successfully logged in.");
			return "success";
		}else{
			setMessage("Invalid username or password.");
			return "error";
		}		
	}	
 
	//getter setters
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
}

welcome.jsp

<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
  <head>
	<title>Struts 2 action example using POJO class.</title>
  </head>
  <body>
	<h3>This is an action example using POJO class.</h3>		
	<s:property value="message" />	 
  </body>
</html>