How to configure Interceptor in Struts2

1) Do following configuration in struts.xml

        <!--If Single interceptor -->

        <struts>

                <package name="default" namespace="/" extends="struts-default" >

                        <interceptors>    

                                <interceptor name="testInterceptor"   class="com.test.interceptors.TestInterceptor">    

                                </interceptor>    

                        </interceptors>

                        <action name="testAction" class="com.test.action.TestAction"

                                        method="execute">

                                        <interceptor-ref name="testInterceptor"></interceptor-ref>

                                        <result name="success">/Test.jsp&lt;/result>

                                </action>

                        </package>

                <!-- Add packages here -->

        </struts>

        <!--If Multiple interceptors then prepare a Stack -->    

        <struts>

                <package name="default" namespace="/" extends="struts-default" >

               

                        <interceptors>

                                <interceptor name="testInterceptor"   class="com.test.interceptors.TestInterceptor"/>    

                                <interceptor name="testInterceptor1"   class="com.test.interceptors.TestInterceptor1"/>        

                                <interceptor-stack name="basicStack">

                                        <interceptor-ref name="testInterceptor" />

                                        <interceptor-ref name="testInterceptor1" />    

                                </interceptor-stack>

                        </interceptors>

                        <action name="testAction" class="com.test.action.TestAction"

                                        method="execute">

                                        <!-- <interceptor-ref name="basicStack"></interceptor-ref>-->

                                        <result name="success">/Test.jsp/result>

                        </action>

        </package>

                <!-- Add packages here -->

        </struts>

       

2) Write Interceptor Class

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.Interceptor;

public class TestInterceptor implements Interceptor {

        @Override

        public String intercept(ActionInvocation arg0) throws Exception {

                //Write your Specific code here.

                return SUCCESS;

        }      

}