package com.how2java.action;
 
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import com.how2java.bean.Category;
import com.how2java.bean.Product;
 
public class ProductAction {
	
	private Date date;
	
	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	private Product product;
	
	private List<Category> categories =new ArrayList();
	
    public List<Category> getCategories() {
		return categories;
	}

	public void setCategories(List<Category> categories) {
		this.categories = categories;
	}

	public String show() {
        product = new Product();
        product.setName("iphone7");
        return "show";
    }
 
    public String add() {
        return "show";
    }
    
	public String list() {
		Category category1 =new Category();
		category1.setId(1);
		category1.setName("category1");
		
		Category category2 =new Category();
		category2.setId(2);
		category2.setName("category2");
		
		categories.add(category1);
		categories.add(category2);
		
        List<Product> products1=new ArrayList();
        Product p1 = new Product();
        p1.setId(1);
        p1.setName("product1");
        Product p2 = new Product();
        p2.setId(2);
        p2.setName("product2");
        Product p3 = new Product();
        p3.setId(3);
        p3.setName("product3");
 
        products1.add(p1);
        products1.add(p2);
        products1.add(p3);
        
        List<Product> products2=new ArrayList();
        Product p4 = new Product();
        p4.setId(4);
        p4.setName("product4");
        Product p5 = new Product();
        p5.setId(5);
        p5.setName("product5");
        Product p6 = new Product();
        p6.setId(6);
        p6.setName("product6");
        
        products2.add(p4);
        products2.add(p5);
        products2.add(p6);
        
        category1.setProducts(products1);
        category2.setProducts(products2);
        
        return "list";
 
    }
 
    public Product getProduct() {
        return product;
    }
 
    public void setProduct(Product product) {
        this.product = product;
    }
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8" isELIgnored="false"%>

<%@ taglib prefix="s" uri="/struts-tags" %>

<%@page isELIgnored="false"%>

${date}

<table border="1" cellspacing="0">
	<tr>
		<td>id</td>
		<td>name</td>
		<td>products</td>
	</tr>
	
	<s:iterator value="categories" var="c">
		<tr>
			<td>${c.id}</td>
			<td>${c.name}</td>
			<td>
				<s:iterator value="#c.products" var="p">
					${p.name}<br/>
				</s:iterator>			
			</td>
		</tr>
	</s:iterator>

</table>

<s:debug/>

package com.how2java.interceptor;

import java.util.Date;

import com.how2java.action.ProductAction;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class DateInterceptor extends AbstractInterceptor {

    public String intercept(ActionInvocation invocation) throws Exception {
       ProductAction action = (ProductAction)invocation.getAction();
       action.setDate(new Date());
   	   return invocation.invoke();
    }
}

<?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>
	<constant name="struts.i18n.encoding" value="UTF-8"></constant>

	<package name="basicstruts" extends="struts-default">
		<interceptors>
			<interceptor name="dateInterceptor" class="com.how2java.interceptor.DateInterceptor" />
		</interceptors>

		<action name="*Product*" class="com.how2java.action.ProductAction"
			method="{1}">
			<interceptor-ref name="dateInterceptor" />
			<interceptor-ref name="defaultStack" />	
			<result name="show">show.jsp</result>
			<result name="list">list.jsp</result>
		</action>

	</package>

</struts>