struts2-demo/web/WEB-INF/classes/struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
    "http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>
    <constant name="struts.devMode" value="true"/>
    <constant name="struts.enable.DynamicMethodInvocation" value="true"/>
    <constant name="struts.i18n.encoding" value="UTF-8"/>

    <package name="default" namespace="/" extends="struts-default">
        <action name="index">
            <result>/index.jsp</result>
        </action>

        <action name="hello" class="com.demo.action.HelloAction" method="execute">
            <result>/hello.jsp</result>
        </action>

        <action name="login" class="com.demo.action.LoginAction" method="execute">
            <result name="success">/user/success.jsp</result>
            <result name="input">/user/login.jsp</result>
        </action>

        <action name="submitUser" class="com.demo.action.UserAction" method="submit">
            <result name="success">/user/success.jsp</result>
            <result name="input">/user/form.jsp</result>
        </action>

        <action name="upload" class="com.demo.action.FileUploadAction" method="execute">
            <result name="success">/upload/success.jsp</result>
            <result name="input">/upload/index.jsp</result>
        </action>

        <action name="ajax" class="com.demo.action.AjaxAction" method="execute">
            <result type="json"/>
        </action>

        <action name="validate" class="com.demo.action.ValidationAction" method="execute">
            <result name="success">/validation/success.jsp</result>
            <result name="input">/validation/form.jsp</result>
        </action>
    </package>

    <package name="rest" namespace="/api" extends="struts-default">
        <action name="users" class="com.demo.action.rest.UserRestAction" method="execute">
            <result type="json"/>
        </action>
    </package>
</struts>