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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://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
    <display-name>Struts2InterceptorExample</display-name>

    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

<!--     <listener> -->
<!--         <listener-class>com.listeners.SessionListener</listener-class> -->
<!--     </listener> -->

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    
    <session-config>
        <session-timeout>1</session-timeout>
    </session-config>
</web-app>




・welcome.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Welcome Page</title>
</head>
<body>
    <h3><s:actionerror/>
        Welcome<br/>
        <s:set var="data" value="#session.userInfo.userId" scope="request"/>
        <s:textfield label="ユーザーID" type="text" value="%{#request.data}" />
        <br/>
        <s:property value="#session.userInfo.password"/>
    </h3>
    <s:form method="post" action="logout">
        <s:submit value="ログアウト" />
    </s:form>
</body>
</html>


・login.jsp
<!DOCTYPE HTML>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Insert title here</title>
</head>
<body>
    <s:actionerror/>
    <s:form method="post" action="auth">
        <s:textfield label="ユーザーID" type="text" name="userInfo.userId" />
        <br/>
        <s:password label="パスワード" type="password" name="userInfo.password" />
        <s:submit value="ログイン" />
    </s:form>
</body>
</html>


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

<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <constant name="struts.convention.result.path" value="/"></constant>
    
    <!-- 任意のメソッドの実行を許可しない -->
    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    
    <package name="user" namespace="/" extends="struts-default">
        <interceptors>
            <interceptor name="session"
                class="com.interceptors.SessionInterceptor"></interceptor>
            <interceptor-stack name="sessionStack">
                <interceptor-ref name="session"></interceptor-ref>
                <interceptor-ref name="defaultStack"></interceptor-ref>
            </interceptor-stack>
        </interceptors>

        <default-interceptor-ref name="sessionStack"></default-interceptor-ref>

        <global-results>
            <result name="login" type="redirect">/login.action</result>
<!--             <result name="login">/login.action</result> -->
        </global-results>

<!--         <action name="sessionAuth"> -->
<!--             <interceptor-ref name="sessionStack" /> -->
<!--             <result name="success">/success.jsp</result> -->
<!--             <result name="session">/sessionexpired.jsp</result> -->
<!--         </action> -->

        <action name="login">
            <interceptor-ref name="defaultStack"></interceptor-ref>
            <result>/WEB-INF/pages/login.jsp</result>
        </action>
        
        <action name="logout" class="com.actions.LogoutAction">
            <interceptor-ref name="defaultStack"></interceptor-ref>
        </action>

        <action name="auth" class="com.actions.LoginAction">
            <interceptor-ref name="defaultStack"></interceptor-ref>
            <result name="success" type="redirect">/welcome.action</result>
            <result name="input">/WEB-INF/pages/login.jsp</result>
        </action>

<!--         <action name="welcome" class="com.actions.WelcomeAction"> -->
        <action name="welcome">
            <result name="success">/WEB-INF/pages/welcome.jsp</result>
        </action>
    </package>

</struts>


・SessionListener.java
package com.listeners;

import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;

public class SessionListener implements HttpSessionBindingListener{
    private String aaa;
    
    @Override
    public void valueBound(HttpSessionBindingEvent arg0) {
        // TODO 自動生成されたメソッド・スタブ
        System.out.println("valueBound");
    }

    @Override
    public void valueUnbound(HttpSessionBindingEvent arg0) {
        // TODO 自動生成されたメソッド・スタブ
        System.out.println("valueUnBound");
    }

}


・SessionInterceptor.java
package com.interceptors;

import java.util.Map;

import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

@Results({
    @Result(name = Action.SUCCESS, location="/WEB-INF/pages/welcome.jsp"),
})
public class SessionInterceptor extends AbstractInterceptor {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Override
    public String intercept(ActionInvocation invocation) throws Exception {
        Map<String,Object> session = invocation.getInvocationContext().getSession();
    
        if(session.isEmpty()) {
            return Action.LOGIN;
        } else {
            return invocation.invoke();
        }
    }
}



・UserInfo.java
package com.beans;

public class UserInfo {
    
    private String userId;
    private String password;
    
    public UserInfo(){}
    public UserInfo(String userId, String password) {
        this.userId = userId;
        this.password = password;
    }
    public String getUserId() {
        return userId;
    }
    public void setUserId(String userName) {
        this.userId = userName;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    
    

}


・LogoutAction.java
package com.actions;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionSupport;

public class LogoutAction extends ActionSupport {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    
    public String execute() {
        HttpSession session = ServletActionContext.getRequest().getSession(true);
        session.invalidate();
        
        return Action.LOGIN;
    }
}



・LoginAction.java
package com.actions;

import javax.servlet.http.HttpSession;
import java.sql.*;

import org.apache.struts2.ServletActionContext;
import com.beans.UserInfo;
import com.opensymphony.xwork2.ActionSupport;


/**
 * ログイン処理を行うアクションメソッドです。
 *
 */
public class LoginAction extends ActionSupport {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    
    private UserInfo userInfo;
    
    /**
     * @return userInfo
     */
    public UserInfo getUserInfo() {
        return userInfo;
    }

    /**
     * @param userInfo セットする userInfo
     */
    public void setUserInfo(UserInfo userInfo) {
        this.userInfo = userInfo;
    }

//    public String execute() {
//        // ここに処理を記載するとvalidateの後で実行されてしまう。
//        return Action.SUCCESS;
//    }
    
    public void validate() {
        if ("admin".equals(userInfo.getUserId())) {
            ServletActionContext.getRequest().getSession(true).invalidate();
            HttpSession newsession = ServletActionContext.getRequest().getSession(true);
            newsession.setAttribute("userInfo", new UserInfo(userInfo.getUserId(), userInfo.getPassword()));
        } else {
            addActionError("userid または password が違います。");
        }
    }
}