Action in struts 2 by extending ActionSupport class


ActionSupport class implements a no. of interfaces like Action, Validateable, LocaleProvider and Serializable etc. It is more commonly used instead of Action interface.

Example:

login.jsp
<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<title>Struts 2 ActionSupport class extends example</title>
</head>
<body>
<h3>This is an ActionSupport class extends example.</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.javawithease.action.Login">
<result name="success">/welcome.jsp</result>
<result name="error">/login.jsp</result>
</action>
</package>
 
</struts>
Login.java
import com.opensymphony.xwork2.ActionSupport;
 
/**
* This class is used as an action class
* and extends ActionSupport class.
* @author javawithease
*/

public class Login extends ActionSupport{
//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 ActionSupport class extends example</title>
</head>
<body>
<h3>This is an ActionSupport class extends example.</h3>
<s:property value="message" />
</body>
</html>

Output:




 
Enter UserName: jai , Password: 1234

 
Click on login button. 1234

No comments: