Struts 2 Zero Configuration by convention approach

A struts application without using struts.xml file is also known as application with Zero Configuration.
Note: Put the view files inside the WEB-INF/content folder. The view file name must follow the below pattern:
View file name: Request name-String returned by action class.

Struts 2 Zero Configuration by convention approach example:

login.jsp
<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<title>
Struts 2 zero configuration by convention approach example
</title>
</head>
<body>
<h3>
This is a zero configuration by convention approach 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>
Login.java
import com.opensymphony.xwork2.ActionSupport;
 
/**
* This class is used as an action 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;
}
}
login-error.jsp
<jsp:include page="/login.jsp"></jsp:include>
login-error.jsp
<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<title>Struts 2 zero configuration by
convention approach example</title>
</head>
<body>
<h3>This is a zero configuration by
convention approach example.</h3>
 
<s:property value="message" />
 
</body>
</html>

Output:


 
Enter UserName: jai and Password: 1234

 
Click on login button.

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