How to configure the struts2 web application -

Step 1 -

web.xml

add filter dispatcher 

<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

Step 2 -

add 5 jar files which required in struts2.x
  • commons-logging-1.1.jar
  • freemarker-2.3.8.jar
  • ognl-2.6.11.jar
  • struts2-core-2.0.6.jar
  • xwork-2.0.1.jar
Step 3 -

add resource folder in below of src folder.
  • create struts.xml file in this resource folder.
  • create ApplicationResource.properties file in this resource folder
Step 4 -

In struts.xml
add 

<!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="true" />
<constant name="struts.devMode" value="false" />
<constant name="struts.custom.i18n.resources" value="ApplicationResources" />

<package name="default" extends="struts-default" namespace="/">
<action name="login" class="com.jeet.struts2.LoginAction" method="authenticate">
<result name="success">Welcome.jsp</result>
<result name="error">Login.jsp</result>
</action>
</package>
</struts>
  • If you want to include ApplicationResource properties file so you have to add this file path in set in constant tag.
  • In case of struts2 by default execute method call of action class. but if you want to call your own method so you have to set constant name="struts.enable.DynamicMethodInvocation" value="true" if you set value="false" means you want to call by default execute method.
  • In package you can create multiple action and also call a new method for every action. mention action class name and method name.set view page according to result means if success show different page and if fail show another page.
Step 4 -

create view (JSP) page -

<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Struts 2 - Login Application</title>
</head>
<body>
<h2>Struts 2 - Login Application</h2>
<s:actionerror />
<s:form action="login.action" method="post">
    <s:textfield name="username" key="label.username" size="20" />
    <s:password name="password" key="label.password" size="20" />
    <s:submit method="authenticate" key="label.login" align="center" />
</s:form>
</body>
</html>
  • set taglib with prefix s and uri struts-tags
  • if you want to show server side error so you have to add <s:actionerror />
  • if form tag pass action with name.action.
  • if you want label value coming from .properties file so in key parameter you can write.
  • At the time of submit you also can specify which method you want to call on click of that button.
Step 5 -

Action Class

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private String username;
private String password;

public String authenticate() {
if (this.username.equals("admin") && this.password.equals("admin123")) {
return "success";
} else {
addActionError(getText("error.login"));
return "error";
}
}

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;
}

}
  • If you want your class action class with struts 2 so extends ActionSupport class.
  • Either override execute() method or if you want to create own method so you can create.
  • If you want to send server side error in view page so call addActionError() method and pass your message either directly or through properties file.

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