Struts2 Interceptors

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Web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns="http://java.sun.com/xml/ns/javaee"xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

id="WebApp_ID" version="2.5">

<display-name>Struts2.3_ProgramaticValidations</display-name>

<welcome-file-list>

<welcome-file>index.html</welcome-file>

</welcome-file-list>

<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>

struts.properties

struts.custom.i18n.resources=messages

messages.properties

title=Struts2 Interceptors Example
username=Enter Your name
password=Enter Password
label.login=Login

error.invalid=Please Enter valid login credentials

index.jsp

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

</head>

<body>

</body>

</html>

login.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
    <h2>
       <s:text name="title"></s:text>
    </h2>
    <s:actionerror />
    <s:form action="authentication">
       <s:textfield name="userName" key="username"></s:textfield>
       <s:password name="password" key="password"></s:password>
       <s:submit key="label.login"></s:submit>
    </s:form>
</body>
</html>

authorizedpage.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Welcome to authorized page... You have now access to confidential pages...:-)</h1>
</body>
</html>

struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <include file="struts-default"></include>
    <package name="default" extends="struts-default">
        <interceptors>
            <interceptor name="authInterceptors" class="com.usr.AuthInterceptor"></interceptor>
        </interceptors>
        <action name="login">
            <result>/WEB-INF/pages/login.jsp</result>
        </action>
        <action name="authentication" class="com.usr.Authentication"
            method="loginCredentialsCheck">
            <result name="success" type="chain">authorizedonly</result>
            <result name="failure">/WEB-INF/pages/login.jsp</result>
        </action>
        <action name="authorizedonly">
            <interceptor-ref name="authInterceptors"></interceptor-ref>
            <result name="success">/WEB-INF/pages/authorizedpage.jsp</result>
            <result name="failure">/WEB-INF/pages/login.jsp</result>
        </action>
    </package>

</struts>

Authentication.java

package com.usr;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionSupport;

public class Authentication extends ActionSupport implements ServletRequestAware{
private String userName;
private String password;
private HttpServletRequest request;
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;
}
@Override
public void setServletRequest(HttpServletRequest request) {
    this.request=request;
}
public HttpServletRequest getRequest() {
    return request;
}
public String loginCredentialsCheck(){
    if(this.getUserName().equals("mahesh")&&this.getPassword().equals("password")){
       HttpSession session=request.getSession();
       session.setAttribute("authorized", "yes");
       return "success";
    }
    else{
       addActionError(getText("error.invalid"));
    return "failure";
    }
}

}

AuthInterceptor.java

package com.usr;

import java.util.Map;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class AuthInterceptor implements Interceptor {

    @Override
    public void destroy() {

    }

    @Override
    public void init() {

    }

    @Override
    public String intercept(ActionInvocation invocation) throws Exception {
        Map<String, Object> sessionAttributes = invocation
                .getInvocationContext().getSession();
        if (sessionAttributes == null
                || sessionAttributes.get("authorized") == null) {
            return "failure";
        } else {
            if (sessionAttributes.get("authorized").equals("yes")) {
                return invocation.invoke();
            } else {
                return "failure";
            }
        }

    }

}

if we acess directly authorisedpage.jsp then,

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