viewproductaction.java

这是一个网上购物店的源码

package org.digitstore.web.struts.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.digitstore.domain.Product;
import org.digitstore.service.*;
import org.springframework.beans.support.PagedListHolder;

public class ViewProductAction extends BaseAction {

    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        String productId = request.getParameter("productId");

        if (productId != null) {
            ProductManager manager = ManagerFactory.createProductManager();
            PagedListHolder itemList = new PagedListHolder(manager
                    .getItemListByProduct(productId));
            itemList.setPageSize(4);
            Product product = manager.getProduct(productId);
            request.getSession().setAttribute("ViewProductAction_itemList",
                    itemList);
            request.getSession().setAttribute("ViewProductAction_product",
                    product);
            request.setAttribute("itemList", itemList);
            request.setAttribute("product", product);
        } else {
            PagedListHolder itemList = (PagedListHolder) request.getSession()
                    .getAttribute("ViewProductAction_itemList");
            Product product = (Product) request.getSession().getAttribute(
                    "ViewProductAction_product");
            String page = request.getParameter("page");
            if ("next".equals(page)) {
                itemList.nextPage();
            } else if ("previous".equals(page)) {
                itemList.previousPage();
            }
            request.setAttribute("itemList", itemList);
            request.setAttribute("product", product);
        }
        return mapping.findForward("success");
    }

}